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Daan 2024-12-30 12:27:46 -08:00 • committed by GitHub
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79 changed files with 3509 additions and 3833 deletions
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1
.gitignore vendored
View file

@ -1,7 +1,6 @@
ide/vs20??/*.db
ide/vs20??/*.opendb
ide/vs20??/*.user
ide/vs20??/*.vcxproj.filters
ide/vs20??/.vs
ide/vs20??/VTune*
out/

128
CMakeLists.txt
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@ -7,18 +7,20 @@ set(CMAKE_CXX_STANDARD 17)
option(MI_SECURE "Use full security mitigations (like guard pages, allocation randomization, double-free mitigation, and free-list corruption detection)" OFF)
option(MI_DEBUG_FULL "Use full internal heap invariant checking in DEBUG mode (expensive)" OFF)
option(MI_PADDING "Enable padding to detect heap block overflow (always on in DEBUG or SECURE mode, or with Valgrind/ASAN)" OFF)
option(MI_OVERRIDE "Override the standard malloc interface (e.g. define entry points for malloc() etc)" ON)
option(MI_OVERRIDE "Override the standard malloc interface (i.e. define entry points for 'malloc', 'free', etc)" ON)
option(MI_XMALLOC "Enable abort() call on memory allocation failure by default" OFF)
option(MI_SHOW_ERRORS "Show error and warning messages by default (only enabled by default in DEBUG mode)" OFF)
option(MI_TRACK_VALGRIND "Compile with Valgrind support (adds a small overhead)" OFF)
option(MI_TRACK_ASAN "Compile with address sanitizer support (adds a small overhead)" OFF)
option(MI_TRACK_ETW "Compile with Windows event tracing (ETW) support (adds a small overhead)" OFF)
option(MI_USE_CXX "Use the C++ compiler to compile the library (instead of the C compiler)" OFF)
option(MI_OPT_ARCH "Only for optimized builds: turn on architecture specific optimizations (for arm64: '-march=armv8.1-a' (2016))" ON)
option(MI_SEE_ASM "Generate assembly files" OFF)
option(MI_OSX_INTERPOSE "Use interpose to override standard malloc on macOS" ON)
option(MI_OSX_ZONE "Use malloc zone to override standard malloc on macOS" ON)
option(MI_WIN_REDIRECT "Use redirection module ('mimalloc-redirect') on Windows if compiling mimalloc as a DLL" ON)
option(MI_LOCAL_DYNAMIC_TLS "Use slightly slower, dlopen-compatible TLS mechanism (Unix)" OFF)
option(MI_WIN_USE_FIXED_TLS "Use a fixed TLS slot on Windows to avoid extra tests in the malloc fast path" OFF)
option(MI_LOCAL_DYNAMIC_TLS "Use local-dynamic-tls, a slightly slower but dlopen-compatible thread local storage mechanism (Unix)" OFF)
option(MI_LIBC_MUSL "Set this when linking with musl libc" OFF)
option(MI_BUILD_SHARED "Build shared library" ON)
option(MI_BUILD_STATIC "Build static library" ON)
@ -26,12 +28,15 @@ option(MI_BUILD_OBJECT "Build object library" ON)
option(MI_BUILD_TESTS "Build test executables" ON)
option(MI_DEBUG_TSAN "Build with thread sanitizer (needs clang)" OFF)
option(MI_DEBUG_UBSAN "Build with undefined-behavior sanitizer (needs clang++)" OFF)
option(MI_GUARDED "Build with guard pages behind certain object allocations (implies MI_NO_PADDING=ON)" OFF)
option(MI_SKIP_COLLECT_ON_EXIT "Skip collecting memory on program exit" OFF)
option(MI_NO_PADDING "Force no use of padding even in DEBUG mode etc." OFF)
option(MI_INSTALL_TOPLEVEL "Install directly into $CMAKE_INSTALL_PREFIX instead of PREFIX/lib/mimalloc-version" OFF)
option(MI_NO_THP "Disable transparent huge pages support on Linux/Android for the mimalloc process only" OFF)
option(MI_EXTRA_CPPDEFS "Extra pre-processor definitions (use as `-DMI_EXTRA_CPPDEFS=\"opt1=val1;opt2=val2\"`)" "")
# deprecated options
option(MI_WIN_USE_FLS "Use Fiber local storage on Windows to detect thread termination (deprecated)" OFF)
option(MI_CHECK_FULL "Use full internal invariant checking in DEBUG mode (deprecated, use MI_DEBUG_FULL instead)" OFF)
option(MI_USE_LIBATOMIC "Explicitly link with -latomic (on older systems) (deprecated and detected automatically)" OFF)
@ -61,30 +66,39 @@ set(mi_sources
set(mi_cflags "")
set(mi_cflags_static "") # extra flags for a static library build
set(mi_cflags_dynamic "") # extra flags for a shared-object library build
set(mi_defines "")
set(mi_libraries "")
if(MI_EXTRA_CPPDEFS)
set(mi_defines ${MI_EXTRA_CPPDEFS})
else()
set(mi_defines "")
endif()
# -----------------------------------------------------------------------------
# Convenience: set default build type depending on the build directory
# Convenience: set default build type and compiler depending on the build directory
# -----------------------------------------------------------------------------
message(STATUS "")
if (NOT CMAKE_BUILD_TYPE)
if ("${CMAKE_BINARY_DIR}" MATCHES ".*(D|d)ebug$" OR MI_DEBUG_FULL)
message(STATUS "No build type selected, default to: Debug")
if ("${CMAKE_BINARY_DIR}" MATCHES ".*((D|d)ebug|asan|tsan|ubsan|valgrind)$" OR MI_DEBUG_FULL)
message(STATUS "No build type selected, default to 'Debug'")
set(CMAKE_BUILD_TYPE "Debug")
else()
message(STATUS "No build type selected, default to: Release")
message(STATUS "No build type selected, default to 'Release'")
set(CMAKE_BUILD_TYPE "Release")
endif()
endif()
if (CMAKE_GENERATOR MATCHES "^Visual Studio.*$")
message(STATUS "Note: when building with Visual Studio the build type is specified when building.")
message(STATUS "For example: 'cmake --build . --config=Release")
endif()
if("${CMAKE_BINARY_DIR}" MATCHES ".*(S|s)ecure$")
message(STATUS "Default to secure build")
set(MI_SECURE "ON")
endif()
# -----------------------------------------------------------------------------
# Process options
# -----------------------------------------------------------------------------
@ -104,6 +118,14 @@ if(CMAKE_C_COMPILER_ID MATCHES "MSVC|Intel")
set(MI_USE_CXX "ON")
endif()
if(CMAKE_BUILD_TYPE MATCHES "Release|RelWithDebInfo")
if (NOT MI_OPT_ARCH)
message(STATUS "Architecture specific optimizations are disabled (MI_OPT_ARCH=OFF)")
endif()
else()
set(MI_OPT_ARCH OFF)
endif()
if(MI_OVERRIDE)
message(STATUS "Override standard malloc (MI_OVERRIDE=ON)")
if(APPLE)
@ -131,12 +153,6 @@ if(MI_OVERRIDE)
endif()
if(WIN32)
if (MI_WIN_REDIRECT)
if (MSVC_C_ARCHITECTURE_ID MATCHES "ARM")
message(STATUS "Cannot use redirection on Windows ARM (MI_WIN_REDIRECT=OFF)")
set(MI_WIN_REDIRECT OFF)
endif()
endif()
if (NOT MI_WIN_REDIRECT)
# use a negative define for backward compatibility
list(APPEND mi_defines MI_WIN_NOREDIRECT=1)
@ -152,8 +168,8 @@ if(MI_TRACK_VALGRIND)
CHECK_INCLUDE_FILES("valgrind/valgrind.h;valgrind/memcheck.h" MI_HAS_VALGRINDH)
if (NOT MI_HAS_VALGRINDH)
set(MI_TRACK_VALGRIND OFF)
message(WARNING "Cannot find the 'valgrind/valgrind.h' and 'valgrind/memcheck.h' -- install valgrind first")
message(STATUS "Compile **without** Valgrind support (MI_TRACK_VALGRIND=OFF)")
message(WARNING "Cannot find the 'valgrind/valgrind.h' and 'valgrind/memcheck.h' -- install valgrind first?")
message(STATUS "Disabling Valgrind support (MI_TRACK_VALGRIND=OFF)")
else()
message(STATUS "Compile with Valgrind support (MI_TRACK_VALGRIND=ON)")
list(APPEND mi_defines MI_TRACK_VALGRIND=1)
@ -199,6 +215,15 @@ if(MI_TRACK_ETW)
endif()
endif()
if(MI_GUARDED)
message(STATUS "Compile guard pages behind certain object allocations (MI_GUARDED=ON)")
list(APPEND mi_defines MI_GUARDED=1)
if(NOT MI_NO_PADDING)
message(STATUS " Disabling padding due to guard pages (MI_NO_PADDING=ON)")
set(MI_NO_PADDING ON)
endif()
endif()
if(MI_SEE_ASM)
message(STATUS "Generate assembly listings (MI_SEE_ASM=ON)")
list(APPEND mi_cflags -save-temps)
@ -297,6 +322,48 @@ if(MI_LIBC_MUSL)
list(APPEND mi_defines MI_LIBC_MUSL=1)
endif()
if(MI_WIN_USE_FLS)
message(STATUS "Use the Fiber API to detect thread termination (deprecated) (MI_WIN_USE_FLS=ON)")
list(APPEND mi_defines MI_WIN_USE_FLS=1)
endif()
if(MI_WIN_USE_FIXED_TLS)
message(STATUS "Use fixed TLS slot on Windows to avoid extra tests in the malloc fast path (MI_WIN_USE_FIXED_TLS=ON)")
list(APPEND mi_defines MI_WIN_USE_FIXED_TLS=1)
endif()
# Determine architecture
set(MI_OPT_ARCH_FLAGS "")
set(MI_ARCH "unknown")
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(x86|i[3456]86)$" OR CMAKE_GENERATOR_PLATFORM MATCHES "^(x86|Win32)$")
set(MI_ARCH "x86")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(x86_64|x64|amd64|AMD64)$" OR CMAKE_GENERATOR_PLATFORM STREQUAL "x64") # must be before arm64
set(MI_ARCH "x64")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64|armv8.?|ARM64)$" OR CMAKE_GENERATOR_PLATFORM STREQUAL "ARM64")
set(MI_ARCH "arm64")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm|armv[34567]|ARM)$")
set(MI_ARCH "arm32")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(riscv|riscv32|riscv64)$")
if(CMAKE_SIZEOF_VOID_P==4)
set(MI_ARCH "riscv32")
else()
set(MI_ARCH "riscv64")
endif()
else()
set(MI_ARCH ${CMAKE_SYSTEM_PROCESSOR})
endif()
message(STATUS "Architecture: ${MI_ARCH}") # (${CMAKE_SYSTEM_PROCESSOR}, ${CMAKE_GENERATOR_PLATFORM}, ${CMAKE_GENERATOR})")
# Check /proc/cpuinfo for an SV39 MMU and limit the virtual address bits.
# (this will skip the aligned hinting in that case. Issue #939, #949)
if (EXISTS /proc/cpuinfo)
file(STRINGS /proc/cpuinfo mi_sv39_mmu REGEX "^mmu[ \t]+:[ \t]+sv39$")
if (mi_sv39_mmu)
MESSAGE( STATUS "Set virtual address bits to 39 (SV39 MMU detected)" )
list(APPEND mi_defines MI_DEFAULT_VIRTUAL_ADDRESS_BITS=39)
endif()
endif()
# On Haiku use `-DCMAKE_INSTALL_PREFIX` instead, issue #788
# if(CMAKE_SYSTEM_NAME MATCHES "Haiku")
# SET(CMAKE_INSTALL_LIBDIR ~/config/non-packaged/lib)
@ -334,14 +401,29 @@ if(CMAKE_C_COMPILER_ID MATCHES "AppleClang|Clang|GNU|Intel" AND NOT CMAKE_SYSTEM
if(MI_OVERRIDE)
list(APPEND mi_cflags -fno-builtin-malloc)
endif()
if(MI_OPT_ARCH)
if(MI_ARCH STREQUAL "arm64")
set(MI_OPT_ARCH_FLAGS "-march=armv8.1-a") # fast atomics
endif()
endif()
endif()
if (MSVC AND MSVC_VERSION GREATER_EQUAL 1914)
list(APPEND mi_cflags /Zc:__cplusplus)
if(MI_OPT_ARCH)
if(MI_ARCH STREQUAL "arm64")
set(MI_OPT_ARCH_FLAGS "/arch:armv8.1") # fast atomics
endif()
endif()
endif()
if(MINGW)
add_definitions(-D_WIN32_WINNT=0x600)
add_definitions(-D_WIN32_WINNT=0x601) # issue #976
endif()
if(MI_OPT_ARCH_FLAGS)
list(APPEND mi_cflags ${MI_OPT_ARCH_FLAGS})
message(STATUS "Architecture specific optimization is enabled (with ${MI_OPT_ARCH_FLAGS}) (MI_OPT_ARCH=ON)")
endif()
# extra needed libraries
@ -462,10 +544,18 @@ if(MI_BUILD_SHARED)
)
if(WIN32 AND MI_WIN_REDIRECT)
# On windows, link and copy the mimalloc redirection dll too.
if(CMAKE_SIZEOF_VOID_P EQUAL 4)
if(CMAKE_GENERATOR_PLATFORM STREQUAL "arm64ec")
set(MIMALLOC_REDIRECT_SUFFIX "-arm64ec")
elseif(MI_ARCH STREQUAL "x64")
set(MIMALLOC_REDIRECT_SUFFIX "")
if(CMAKE_SYSTEM_PROCESSOR STREQUAL "ARM64")
message(STATUS "Note: x64 code emulated on Windows for arm64 should use an arm64ec build of 'mimalloc-override.dll'")
message(STATUS " with 'mimalloc-redirect-arm64ec.dll'. See the 'bin\\readme.md' for more information.")
endif()
elseif(MI_ARCH STREQUAL "x86")
set(MIMALLOC_REDIRECT_SUFFIX "32")
else()
set(MIMALLOC_REDIRECT_SUFFIX "")
set(MIMALLOC_REDIRECT_SUFFIX "-${MI_ARCH}") # -arm64 etc.
endif()
target_link_libraries(mimalloc PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/bin/mimalloc-redirect${MIMALLOC_REDIRECT_SUFFIX}.lib)

197
azure-pipelines.yml
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@ -15,7 +15,7 @@ trigger:
jobs:
- job:
displayName: Windows
displayName: Windows 2022
pool:
vmImage:
windows-2022
@ -43,7 +43,7 @@ jobs:
solution: $(BuildType)/libmimalloc.sln
configuration: '$(MSBuildConfiguration)'
msbuildArguments: -m
- script: ctest --verbose --timeout 120 -C $(MSBuildConfiguration)
- script: ctest --verbose --timeout 240 -C $(MSBuildConfiguration)
workingDirectory: $(BuildType)
displayName: CTest
#- script: $(BuildType)\$(BuildType)\mimalloc-test-stress
@ -52,7 +52,7 @@ jobs:
# artifact: mimalloc-windows-$(BuildType)
- job:
displayName: Linux
displayName: Ubuntu 22.04
pool:
vmImage:
ubuntu-22.04
@ -113,7 +113,12 @@ jobs:
CXX: clang++
BuildType: debug-tsan-clang-cxx
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=RelWithDebInfo -DMI_USE_CXX=ON -DMI_DEBUG_TSAN=ON
Debug Guarded Clang:
CC: clang
CXX: clang
BuildType: debug-guarded-clang
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=RelWithDebInfo -DMI_DEBUG_FULL=ON -DMI_GUARDED=ON
steps:
- task: CMake@1
inputs:
@ -121,17 +126,19 @@ jobs:
cmakeArgs: .. $(cmakeExtraArgs)
- script: make -j$(nproc) -C $(BuildType)
displayName: Make
- script: ctest --verbose --timeout 180
- script: ctest --verbose --timeout 240
workingDirectory: $(BuildType)
displayName: CTest
env:
MIMALLOC_GUARDED_SAMPLE_RATE: 1000
# - upload: $(Build.SourcesDirectory)/$(BuildType)
# artifact: mimalloc-ubuntu-$(BuildType)
- job:
displayName: macOS
displayName: macOS 14 (Sonoma)
pool:
vmImage:
macOS-latest
macOS-14
strategy:
matrix:
Debug:
@ -150,41 +157,151 @@ jobs:
cmakeArgs: .. $(cmakeExtraArgs)
- script: make -j$(sysctl -n hw.ncpu) -C $(BuildType)
displayName: Make
- script: ctest --verbose --timeout 120
- script: ctest --verbose --timeout 240
workingDirectory: $(BuildType)
displayName: CTest
# - upload: $(Build.SourcesDirectory)/$(BuildType)
# artifact: mimalloc-macos-$(BuildType)
# - job:
# displayName: Windows-2017
# pool:
# vmImage:
# vs2017-win2016
# strategy:
# matrix:
# Debug:
# BuildType: debug
# cmakeExtraArgs: -A x64 -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON
# MSBuildConfiguration: Debug
# Release:
# BuildType: release
# cmakeExtraArgs: -A x64 -DCMAKE_BUILD_TYPE=Release
# MSBuildConfiguration: Release
# Secure:
# BuildType: secure
# cmakeExtraArgs: -A x64 -DCMAKE_BUILD_TYPE=Release -DMI_SECURE=ON
# MSBuildConfiguration: Release
# steps:
# - task: CMake@1
# inputs:
# workingDirectory: $(BuildType)
# cmakeArgs: .. $(cmakeExtraArgs)
# - task: MSBuild@1
# inputs:
# solution: $(BuildType)/libmimalloc.sln
# configuration: '$(MSBuildConfiguration)'
# - script: |
# cd $(BuildType)
# ctest --verbose --timeout 120
# displayName: CTest
# ----------------------------------------------------------
# Other OS versions (just debug mode)
# ----------------------------------------------------------
- job:
displayName: Windows 2019
pool:
vmImage:
windows-2019
strategy:
matrix:
Debug:
BuildType: debug
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON
MSBuildConfiguration: Debug
Release:
BuildType: release
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Release
MSBuildConfiguration: Release
steps:
- task: CMake@1
inputs:
workingDirectory: $(BuildType)
cmakeArgs: .. $(cmakeExtraArgs)
- task: MSBuild@1
inputs:
solution: $(BuildType)/libmimalloc.sln
configuration: '$(MSBuildConfiguration)'
msbuildArguments: -m
- script: ctest --verbose --timeout 240 -C $(MSBuildConfiguration)
workingDirectory: $(BuildType)
displayName: CTest
- job:
displayName: Ubuntu 24.04
pool:
vmImage:
ubuntu-24.04
strategy:
matrix:
Debug:
CC: gcc
CXX: g++
BuildType: debug
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON
Debug++:
CC: gcc
CXX: g++
BuildType: debug-cxx
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON -DMI_USE_CXX=ON
Debug Clang:
CC: clang
CXX: clang++
BuildType: debug-clang
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON
Debug++ Clang:
CC: clang
CXX: clang++
BuildType: debug-clang-cxx
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON -DMI_USE_CXX=ON
Release Clang:
CC: clang
CXX: clang++
BuildType: release-clang
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Release
steps:
- task: CMake@1
inputs:
workingDirectory: $(BuildType)
cmakeArgs: .. $(cmakeExtraArgs)
- script: make -j$(nproc) -C $(BuildType)
displayName: Make
- script: ctest --verbose --timeout 240
workingDirectory: $(BuildType)
displayName: CTest
- job:
displayName: Ubuntu 20.04
pool:
vmImage:
ubuntu-20.04
strategy:
matrix:
Debug:
CC: gcc
CXX: g++
BuildType: debug
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON
Debug++:
CC: gcc
CXX: g++
BuildType: debug-cxx
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON -DMI_USE_CXX=ON
Debug Clang:
CC: clang
CXX: clang++
BuildType: debug-clang
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON
Debug++ Clang:
CC: clang
CXX: clang++
BuildType: debug-clang-cxx
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON -DMI_USE_CXX=ON
Release Clang:
CC: clang
CXX: clang++
BuildType: release-clang
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Release
steps:
- task: CMake@1
inputs:
workingDirectory: $(BuildType)
cmakeArgs: .. $(cmakeExtraArgs)
- script: make -j$(nproc) -C $(BuildType)
displayName: Make
- script: ctest --verbose --timeout 240
workingDirectory: $(BuildType)
displayName: CTest
- job:
displayName: macOS 15 (Sequoia)
pool:
vmImage:
macOS-15
strategy:
matrix:
Debug:
BuildType: debug
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Debug -DMI_DEBUG_FULL=ON
Release:
BuildType: release
cmakeExtraArgs: -DCMAKE_BUILD_TYPE=Release
steps:
- task: CMake@1
inputs:
workingDirectory: $(BuildType)
cmakeArgs: .. $(cmakeExtraArgs)
- script: make -j$(sysctl -n hw.ncpu) -C $(BuildType)
displayName: Make
- script: ctest --verbose --timeout 240
workingDirectory: $(BuildType)
displayName: CTest

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bin/readme.md
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@ -1,27 +1,30 @@
# Windows Override
<span id="override_on_windows">Dynamically overriding on mimalloc on Windows</span>
is robust and has the particular advantage to be able to redirect all malloc/free calls that go through
the (dynamic) C runtime allocator, including those from other DLL's or libraries.
As it intercepts all allocation calls on a low level, it can be used reliably
is robust and has the particular advantage to be able to redirect all malloc/free calls
that go through the (dynamic) C runtime allocator, including those from other DLL's or
libraries. As it intercepts all allocation calls on a low level, it can be used reliably
on large programs that include other 3rd party components.
There are four requirements to make the overriding work robustly:
There are four requirements to make the overriding work well:
1. Use the C-runtime library as a DLL (using the `/MD` or `/MDd` switch).
2. Link your program explicitly with `mimalloc-override.dll` library.
To ensure the `mimalloc-override.dll` is loaded at run-time it is easiest to insert some
call to the mimalloc API in the `main` function, like `mi_version()`
(or use the `/INCLUDE:mi_version` switch on the linker). See the `mimalloc-override-test` project
for an example on how to use this.
2. Link your program explicitly with the `mimalloc.lib` export library for
the `mimalloc.dll` -- which contains all mimalloc functionality.
To ensure the `mimalloc.dll` is actually loaded at run-time it is easiest
to insert some call to the mimalloc API in the `main` function, like `mi_version()`
(or use the `/include:mi_version` switch on the linker, or
similarly, `#pragma comment(linker, "/include:mi_version")` in some source file).
See the `mimalloc-test-override` project for an example on how to use this.
3. The `mimalloc-redirect.dll` (or `mimalloc-redirect32.dll`) must be put
in the same folder as the main `mimalloc-override.dll` at runtime (as it is a dependency of that DLL).
The redirection DLL ensures that all calls to the C runtime malloc API get redirected to
mimalloc functions (which reside in `mimalloc-override.dll`).
3. The `mimalloc-redirect.dll` must be put in the same folder as the main
`mimalloc.dll` at runtime (as it is a dependency of that DLL).
The redirection DLL ensures that all calls to the C runtime malloc API get
redirected to mimalloc functions (which reside in `mimalloc.dll`).
4. Ensure the `mimalloc-override.dll` comes as early as possible in the import
4. Ensure the `mimalloc.dll` comes as early as possible in the import
list of the final executable (so it can intercept all potential allocations).
You can use `minject -l <exe>` to check this if needed.
For best performance on Windows with C++, it
is also recommended to also override the `new`/`delete` operations (by including
@ -29,18 +32,43 @@ is also recommended to also override the `new`/`delete` operations (by including
a single(!) source file in your project).
The environment variable `MIMALLOC_DISABLE_REDIRECT=1` can be used to disable dynamic
overriding at run-time. Use `MIMALLOC_VERBOSE=1` to check if mimalloc was successfully redirected.
overriding at run-time. Use `MIMALLOC_VERBOSE=1` to check if mimalloc was successfully
redirected.
## Minject
### Other Platforms
We cannot always re-link an executable with `mimalloc-override.dll`, and similarly, we cannot always
ensure the the DLL comes first in the import table of the final executable.
You always link with `mimalloc.dll` but for different platforms you may
need a specific redirection DLL:
- __x64__: `mimalloc-redirect.dll`.
- __x86__: `mimalloc-redirect32.dll`. Use for older 32-bit Windows programs.
- __arm64__: `mimalloc-redirect-arm64.dll`. Use for native Windows arm64 programs.
- __arm64ec__: `mimalloc-redirect-arm64ec.dll`. The [arm64ec] ABI is "emulation compatible"
mode on Windows arm64. Unfortunately we cannot run x64 code emulated on Windows arm64 with
the x64 mimalloc override directly (since the C runtime always uses `arm64ec`). Instead:
1. Build the program as normal for x64 and link as normal with the x64
`mimalloc.lib` export library.
2. Now separately build `mimalloc.dll` in `arm64ec` mode and _overwrite_ your
previous (x64) `mimalloc.dll` -- the loader can handle the mix of arm64ec
and x64 code. Now use `mimalloc-redirect-arm64ec.dll` to match your new
arm64ec `mimalloc.dll`. The main program stays as is and can be fully x64
or contain more arm64ec modules. At runtime, the arm64ec `mimalloc.dll` will
run with native arm64 instructions while the rest of the program runs emulated x64.
[arm64ec]: https://learn.microsoft.com/en-us/windows/arm/arm64ec
### Minject
We cannot always re-link an executable with `mimalloc.dll`, and similarly, we
cannot always ensure that the DLL comes first in the import table of the final executable.
In many cases though we can patch existing executables without any recompilation
if they are linked with the dynamic C runtime (`ucrtbase.dll`) -- just put the `mimalloc-override.dll`
into the import table (and put `mimalloc-redirect.dll` in the same folder)
Such patching can be done for example with [CFF Explorer](https://ntcore.com/?page_id=388).
if they are linked with the dynamic C runtime (`ucrtbase.dll`) -- just put the
`mimalloc.dll` into the import table (and put `mimalloc-redirect.dll` in the same
directory) Such patching can be done for example with [CFF Explorer](https://ntcore.com/?page_id=388).
The `minject` program can also do this from the command line, use `minject --help` for options:
The `minject` program can also do this from the command line
Use `minject --help` for options:
```
> minject --help
@ -58,8 +86,8 @@ options:
-l --list only list imported modules
-i --inplace update the exe in-place (make sure there is a backup!)
-f --force always overwrite without prompting
--postfix=<p> use <p> as a postfix to the mimalloc dll (default is 'override')
e.g. use --postfix=override-debug to link with mimalloc-override-debug.dll
--postfix=<p> use <p> as a postfix to the mimalloc dll.
e.g. use --postfix=debug to link with mimalloc-debug.dll
notes:
Without '--inplace' an injected <exe> is generated with the same name ending in '-mi'.
@ -69,3 +97,6 @@ examples:
> minject --list myprogram.exe
> minject --force --inplace myprogram.exe
```
For x86 32-bit binaries, use `minject32`, and for arm64 binaries use `minject-arm64`.

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232
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26
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234
ide/vs2022/mimalloc-override.vcxproj → ide/vs2022/mimalloc-override-dll.vcxproj
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<ConformanceMode>true</ConformanceMode>
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<Optimization>Disabled</Optimization>
<SDLCheck>true</SDLCheck>
<ConformanceMode>true</ConformanceMode>
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<CompileAs>Default</CompileAs>
<CompileAs>CompileAsCpp</CompileAs>
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<Link>
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<AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
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<IntrinsicFunctions>true</IntrinsicFunctions>
<ConformanceMode>true</ConformanceMode>
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18
ide/vs2022/mimalloc-override.vcxproj.filters → ide/vs2022/mimalloc-override-dll.vcxproj.filters
View file

@ -16,6 +16,9 @@
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168
ide/vs2022/mimalloc-override-test.vcxproj
View file

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EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {4297F93D-486A-4243-995F-7D32F59AE82A}
EndGlobalSection
EndGlobal

25
include/mimalloc.h
View file

@ -148,6 +148,7 @@ typedef void (mi_cdecl mi_error_fun)(int err, void* arg);
mi_decl_export void mi_register_error(mi_error_fun* fun, void* arg);
mi_decl_export void mi_collect(bool force) mi_attr_noexcept;
mi_decl_export void mi_collect_reduce(size_t target_thread_owned) mi_attr_noexcept;
mi_decl_export int mi_version(void) mi_attr_noexcept;
mi_decl_export void mi_stats_reset(void) mi_attr_noexcept;
mi_decl_export void mi_stats_merge(void) mi_attr_noexcept;
@ -275,7 +276,7 @@ mi_decl_export int mi_reserve_huge_os_pages_at(size_t pages, int numa_node, size
mi_decl_export int mi_reserve_os_memory(size_t size, bool commit, bool allow_large) mi_attr_noexcept;
mi_decl_export bool mi_manage_os_memory(void* start, size_t size, bool is_committed, bool is_large, bool is_zero, int numa_node) mi_attr_noexcept;
mi_decl_export void mi_debug_show_arenas(bool show_inuse, bool show_abandoned, bool show_purge) mi_attr_noexcept;
mi_decl_export void mi_debug_show_arenas(bool show_inuse) mi_attr_noexcept;
// Experimental: heaps associated with specific memory arena's
typedef int mi_arena_id_t;
@ -290,7 +291,7 @@ mi_decl_nodiscard mi_decl_export mi_heap_t* mi_heap_new_in_arena(mi_arena_id_t a
#endif
// Experimental: allow sub-processes whose memory segments stay separated (and no reclamation between them)
// Experimental: allow sub-processes whose memory segments stay separated (and no reclamation between them)
// Used for example for separate interpreter's in one process.
typedef void* mi_subproc_id_t;
mi_decl_export mi_subproc_id_t mi_subproc_main(void);
@ -309,6 +310,12 @@ mi_decl_nodiscard mi_decl_export mi_heap_t* mi_heap_new_ex(int heap_tag, bool al
// deprecated
mi_decl_export int mi_reserve_huge_os_pages(size_t pages, double max_secs, size_t* pages_reserved) mi_attr_noexcept;
// Experimental: objects followed by a guard page.
// A sample rate of 0 disables guarded objects, while 1 uses a guard page for every object.
// A seed of 0 uses a random start point. Only objects within the size bound are eligable for guard pages.
mi_decl_export void mi_heap_guarded_set_sample_rate(mi_heap_t* heap, size_t sample_rate, size_t seed);
mi_decl_export void mi_heap_guarded_set_size_bound(mi_heap_t* heap, size_t min, size_t max);
// ------------------------------------------------------
// Convenience
@ -349,7 +356,7 @@ typedef enum mi_option_e {
mi_option_deprecated_segment_cache,
mi_option_deprecated_page_reset,
mi_option_abandoned_page_purge, // immediately purge delayed purges on thread termination
mi_option_deprecated_segment_reset,
mi_option_deprecated_segment_reset,
mi_option_eager_commit_delay, // the first N segments per thread are not eagerly committed (but per page in the segment on demand)
mi_option_purge_delay, // memory purging is delayed by N milli seconds; use 0 for immediate purging or -1 for no purging at all. (=10)
mi_option_use_numa_nodes, // 0 = use all available numa nodes, otherwise use at most N nodes.
@ -366,6 +373,12 @@ typedef enum mi_option_e {
mi_option_disallow_arena_alloc, // 1 = do not use arena's for allocation (except if using specific arena id's)
mi_option_retry_on_oom, // retry on out-of-memory for N milli seconds (=400), set to 0 to disable retries. (only on windows)
mi_option_visit_abandoned, // allow visiting heap blocks from abandoned threads (=0)
mi_option_guarded_min, // only used when building with MI_GUARDED: minimal rounded object size for guarded objects (=0)
mi_option_guarded_max, // only used when building with MI_GUARDED: maximal rounded object size for guarded objects (=0)
mi_option_guarded_precise, // disregard minimal alignment requirement to always place guarded blocks exactly in front of a guard page (=0)
mi_option_guarded_sample_rate, // 1 out of N allocations in the min/max range will be guarded (=1000)
mi_option_guarded_sample_seed, // can be set to allow for a (more) deterministic re-execution when a guard page is triggered (=0)
mi_option_target_segments_per_thread, // experimental (=0)
_mi_option_last,
// legacy option names
mi_option_large_os_pages = mi_option_allow_large_os_pages,
@ -535,7 +548,7 @@ template<class T, bool _mi_destroy> struct _mi_heap_stl_allocator_common : publi
protected:
std::shared_ptr<mi_heap_t> heap;
template<class U, bool D> friend struct _mi_heap_stl_allocator_common;
_mi_heap_stl_allocator_common() {
mi_heap_t* hp = mi_heap_new();
this->heap.reset(hp, (_mi_destroy ? &heap_destroy : &heap_delete)); /* calls heap_delete/destroy when the refcount drops to zero */
@ -552,7 +565,7 @@ private:
template<class T> struct mi_heap_stl_allocator : public _mi_heap_stl_allocator_common<T, false> {
using typename _mi_heap_stl_allocator_common<T, false>::size_type;
mi_heap_stl_allocator() : _mi_heap_stl_allocator_common<T, false>() { } // creates fresh heap that is deleted when the destructor is called
mi_heap_stl_allocator(mi_heap_t* hp) : _mi_heap_stl_allocator_common<T, false>(hp) { } // no delete nor destroy on the passed in heap
mi_heap_stl_allocator(mi_heap_t* hp) : _mi_heap_stl_allocator_common<T, false>(hp) { } // no delete nor destroy on the passed in heap
template<class U> mi_heap_stl_allocator(const mi_heap_stl_allocator<U>& x) mi_attr_noexcept : _mi_heap_stl_allocator_common<T, false>(x) { }
mi_heap_stl_allocator select_on_container_copy_construction() const { return *this; }
@ -569,7 +582,7 @@ template<class T1, class T2> bool operator!=(const mi_heap_stl_allocator<T1>& x,
template<class T> struct mi_heap_destroy_stl_allocator : public _mi_heap_stl_allocator_common<T, true> {
using typename _mi_heap_stl_allocator_common<T, true>::size_type;
mi_heap_destroy_stl_allocator() : _mi_heap_stl_allocator_common<T, true>() { } // creates fresh heap that is destroyed when the destructor is called
mi_heap_destroy_stl_allocator(mi_heap_t* hp) : _mi_heap_stl_allocator_common<T, true>(hp) { } // no delete nor destroy on the passed in heap
mi_heap_destroy_stl_allocator(mi_heap_t* hp) : _mi_heap_stl_allocator_common<T, true>(hp) { } // no delete nor destroy on the passed in heap
template<class U> mi_heap_destroy_stl_allocator(const mi_heap_destroy_stl_allocator<U>& x) mi_attr_noexcept : _mi_heap_stl_allocator_common<T, true>(x) { }
mi_heap_destroy_stl_allocator select_on_container_copy_construction() const { return *this; }

62
include/mimalloc/atomic.h
View file

@ -1,5 +1,5 @@
/* ----------------------------------------------------------------------------
Copyright (c) 2018-2023 Microsoft Research, Daan Leijen
Copyright (c) 2018-2024 Microsoft Research, Daan Leijen
This is free software; you can redistribute it and/or modify it under the
terms of the MIT license. A copy of the license can be found in the file
"LICENSE" at the root of this distribution.
@ -72,6 +72,7 @@ terms of the MIT license. A copy of the license can be found in the file
#define mi_atomic_load_relaxed(p) mi_atomic(load_explicit)(p,mi_memory_order(relaxed))
#define mi_atomic_store_release(p,x) mi_atomic(store_explicit)(p,x,mi_memory_order(release))
#define mi_atomic_store_relaxed(p,x) mi_atomic(store_explicit)(p,x,mi_memory_order(relaxed))
#define mi_atomic_exchange_relaxed(p,x) mi_atomic(exchange_explicit)(p,x,mi_memory_order(relaxed))
#define mi_atomic_exchange_release(p,x) mi_atomic(exchange_explicit)(p,x,mi_memory_order(release))
#define mi_atomic_exchange_acq_rel(p,x) mi_atomic(exchange_explicit)(p,x,mi_memory_order(acq_rel))
#define mi_atomic_cas_weak_release(p,exp,des) mi_atomic_cas_weak(p,exp,des,mi_memory_order(release),mi_memory_order(relaxed))
@ -110,6 +111,7 @@ static inline intptr_t mi_atomic_subi(_Atomic(intptr_t)*p, intptr_t sub);
#define mi_atomic_cas_ptr_weak_release(tp,p,exp,des) mi_atomic_cas_weak_release(p,exp,(tp*)des)
#define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des) mi_atomic_cas_weak_acq_rel(p,exp,(tp*)des)
#define mi_atomic_cas_ptr_strong_release(tp,p,exp,des) mi_atomic_cas_strong_release(p,exp,(tp*)des)
#define mi_atomic_exchange_ptr_relaxed(tp,p,x) mi_atomic_exchange_relaxed(p,(tp*)x)
#define mi_atomic_exchange_ptr_release(tp,p,x) mi_atomic_exchange_release(p,(tp*)x)
#define mi_atomic_exchange_ptr_acq_rel(tp,p,x) mi_atomic_exchange_acq_rel(p,(tp*)x)
#else
@ -118,6 +120,7 @@ static inline intptr_t mi_atomic_subi(_Atomic(intptr_t)*p, intptr_t sub);
#define mi_atomic_cas_ptr_weak_release(tp,p,exp,des) mi_atomic_cas_weak_release(p,exp,des)
#define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des) mi_atomic_cas_weak_acq_rel(p,exp,des)
#define mi_atomic_cas_ptr_strong_release(tp,p,exp,des) mi_atomic_cas_strong_release(p,exp,des)
#define mi_atomic_exchange_ptr_relaxed(tp,p,x) mi_atomic_exchange_relaxed(p,x)
#define mi_atomic_exchange_ptr_release(tp,p,x) mi_atomic_exchange_release(p,x)
#define mi_atomic_exchange_ptr_acq_rel(tp,p,x) mi_atomic_exchange_acq_rel(p,x)
#endif
@ -402,19 +405,46 @@ static inline void mi_atomic_yield(void) {
// ----------------------------------------------------------------------
// Locks are only used for abandoned segment visiting in `arena.c`
// Locks
// These do not have to be recursive and should be light-weight
// in-process only locks. Only used for reserving arena's and to
// maintain the abandoned list.
// ----------------------------------------------------------------------
#if _MSC_VER
#pragma warning(disable:26110) // unlock with holding lock
#endif
#define mi_lock(lock) for(bool _go = (mi_lock_acquire(lock),true); _go; (mi_lock_release(lock), _go=false) )
#if defined(_WIN32)
#if 1
#define mi_lock_t SRWLOCK // slim reader-writer lock
static inline bool mi_lock_try_acquire(mi_lock_t* lock) {
return TryAcquireSRWLockExclusive(lock);
}
static inline void mi_lock_acquire(mi_lock_t* lock) {
AcquireSRWLockExclusive(lock);
}
static inline void mi_lock_release(mi_lock_t* lock) {
ReleaseSRWLockExclusive(lock);
}
static inline void mi_lock_init(mi_lock_t* lock) {
InitializeSRWLock(lock);
}
static inline void mi_lock_done(mi_lock_t* lock) {
(void)(lock);
}
#else
#define mi_lock_t CRITICAL_SECTION
static inline bool mi_lock_try_acquire(mi_lock_t* lock) {
return TryEnterCriticalSection(lock);
}
static inline bool mi_lock_acquire(mi_lock_t* lock) {
static inline void mi_lock_acquire(mi_lock_t* lock) {
EnterCriticalSection(lock);
return true;
}
static inline void mi_lock_release(mi_lock_t* lock) {
LeaveCriticalSection(lock);
@ -426,16 +456,22 @@ static inline void mi_lock_done(mi_lock_t* lock) {
DeleteCriticalSection(lock);
}
#endif
#elif defined(MI_USE_PTHREADS)
void _mi_error_message(int err, const char* fmt, ...);
#define mi_lock_t pthread_mutex_t
static inline bool mi_lock_try_acquire(mi_lock_t* lock) {
return (pthread_mutex_trylock(lock) == 0);
}
static inline bool mi_lock_acquire(mi_lock_t* lock) {
return (pthread_mutex_lock(lock) == 0);
static inline void mi_lock_acquire(mi_lock_t* lock) {
const int err = pthread_mutex_lock(lock);
if (err != 0) {
_mi_error_message(err, "internal error: lock cannot be acquired\n");
}
}
static inline void mi_lock_release(mi_lock_t* lock) {
pthread_mutex_unlock(lock);
@ -447,18 +483,16 @@ static inline void mi_lock_done(mi_lock_t* lock) {
pthread_mutex_destroy(lock);
}
/*
#elif defined(__cplusplus)
#include <mutex>
#define mi_lock_t std::mutex
static inline bool mi_lock_try_acquire(mi_lock_t* lock) {
return lock->lock_try_acquire();
return lock->try_lock();
}
static inline bool mi_lock_acquire(mi_lock_t* lock) {
static inline void mi_lock_acquire(mi_lock_t* lock) {
lock->lock();
return true;
}
static inline void mi_lock_release(mi_lock_t* lock) {
lock->unlock();
@ -469,7 +503,6 @@ static inline void mi_lock_init(mi_lock_t* lock) {
static inline void mi_lock_done(mi_lock_t* lock) {
(void)(lock);
}
*/
#else
@ -482,12 +515,11 @@ static inline bool mi_lock_try_acquire(mi_lock_t* lock) {
uintptr_t expected = 0;
return mi_atomic_cas_strong_acq_rel(lock, &expected, (uintptr_t)1);
}
static inline bool mi_lock_acquire(mi_lock_t* lock) {
static inline void mi_lock_acquire(mi_lock_t* lock) {
for (int i = 0; i < 1000; i++) { // for at most 1000 tries?
if (mi_lock_try_acquire(lock)) return true;
if (mi_lock_try_acquire(lock)) return;
mi_atomic_yield();
}
return true;
}
static inline void mi_lock_release(mi_lock_t* lock) {
mi_atomic_store_release(lock, (uintptr_t)0);
@ -502,6 +534,4 @@ static inline void mi_lock_done(mi_lock_t* lock) {
#endif
#endif // __MIMALLOC_ATOMIC_H

342
include/mimalloc/internal.h
View file

@ -31,16 +31,19 @@ terms of the MIT license. A copy of the license can be found in the file
#define mi_decl_thread __declspec(thread)
#define mi_decl_cache_align __declspec(align(MI_CACHE_LINE))
#define mi_decl_weak
#define mi_decl_hidden
#elif (defined(__GNUC__) && (__GNUC__ >= 3)) || defined(__clang__) // includes clang and icc
#define mi_decl_noinline __attribute__((noinline))
#define mi_decl_thread __thread
#define mi_decl_cache_align __attribute__((aligned(MI_CACHE_LINE)))
#define mi_decl_weak __attribute__((weak))
#define mi_decl_hidden __attribute__((visibility("hidden")))
#else
#define mi_decl_noinline
#define mi_decl_thread __thread // hope for the best :-)
#define mi_decl_cache_align
#define mi_decl_weak
#define mi_decl_hidden
#endif
#if defined(__EMSCRIPTEN__) && !defined(__wasi__)
@ -53,82 +56,100 @@ terms of the MIT license. A copy of the license can be found in the file
#define mi_decl_externc
#endif
// "libc.c"
#include <stdarg.h>
void _mi_vsnprintf(char* buf, size_t bufsize, const char* fmt, va_list args);
void _mi_snprintf(char* buf, size_t buflen, const char* fmt, ...);
char _mi_toupper(char c);
int _mi_strnicmp(const char* s, const char* t, size_t n);
void _mi_strlcpy(char* dest, const char* src, size_t dest_size);
void _mi_strlcat(char* dest, const char* src, size_t dest_size);
size_t _mi_strlen(const char* s);
size_t _mi_strnlen(const char* s, size_t max_len);
bool _mi_getenv(const char* name, char* result, size_t result_size);
// "options.c"
void _mi_fputs(mi_output_fun* out, void* arg, const char* prefix, const char* message);
void _mi_fprintf(mi_output_fun* out, void* arg, const char* fmt, ...);
void _mi_warning_message(const char* fmt, ...);
void _mi_verbose_message(const char* fmt, ...);
void _mi_trace_message(const char* fmt, ...);
void _mi_options_init(void);
void _mi_error_message(int err, const char* fmt, ...);
void _mi_fputs(mi_output_fun* out, void* arg, const char* prefix, const char* message);
void _mi_fprintf(mi_output_fun* out, void* arg, const char* fmt, ...);
void _mi_warning_message(const char* fmt, ...);
void _mi_verbose_message(const char* fmt, ...);
void _mi_trace_message(const char* fmt, ...);
void _mi_options_init(void);
long _mi_option_get_fast(mi_option_t option);
void _mi_error_message(int err, const char* fmt, ...);
// random.c
void _mi_random_init(mi_random_ctx_t* ctx);
void _mi_random_init_weak(mi_random_ctx_t* ctx);
void _mi_random_reinit_if_weak(mi_random_ctx_t * ctx);
void _mi_random_split(mi_random_ctx_t* ctx, mi_random_ctx_t* new_ctx);
uintptr_t _mi_random_next(mi_random_ctx_t* ctx);
uintptr_t _mi_heap_random_next(mi_heap_t* heap);
uintptr_t _mi_os_random_weak(uintptr_t extra_seed);
void _mi_random_init(mi_random_ctx_t* ctx);
void _mi_random_init_weak(mi_random_ctx_t* ctx);
void _mi_random_reinit_if_weak(mi_random_ctx_t * ctx);
void _mi_random_split(mi_random_ctx_t* ctx, mi_random_ctx_t* new_ctx);
uintptr_t _mi_random_next(mi_random_ctx_t* ctx);
uintptr_t _mi_heap_random_next(mi_heap_t* heap);
uintptr_t _mi_os_random_weak(uintptr_t extra_seed);
static inline uintptr_t _mi_random_shuffle(uintptr_t x);
// init.c
extern mi_decl_cache_align mi_stats_t _mi_stats_main;
extern mi_decl_cache_align const mi_page_t _mi_page_empty;
bool _mi_is_main_thread(void);
size_t _mi_current_thread_count(void);
bool _mi_preloading(void); // true while the C runtime is not initialized yet
void _mi_thread_done(mi_heap_t* heap);
void _mi_thread_data_collect(void);
void _mi_tld_init(mi_tld_t* tld, mi_heap_t* bheap);
extern mi_decl_hidden mi_decl_cache_align const mi_page_t _mi_page_empty;
void _mi_process_load(void);
void mi_cdecl _mi_process_done(void);
bool _mi_is_redirected(void);
bool _mi_allocator_init(const char** message);
void _mi_allocator_done(void);
bool _mi_is_main_thread(void);
size_t _mi_current_thread_count(void);
bool _mi_preloading(void); // true while the C runtime is not initialized yet
void _mi_thread_done(mi_heap_t* heap);
void _mi_thread_data_collect(void);
void _mi_tld_init(mi_tld_t* tld, mi_heap_t* bheap);
mi_threadid_t _mi_thread_id(void) mi_attr_noexcept;
mi_heap_t* _mi_heap_main_get(void); // statically allocated main backing heap
mi_subproc_t* _mi_subproc_from_id(mi_subproc_id_t subproc_id);
void _mi_heap_guarded_init(mi_heap_t* heap);
// os.c
void _mi_os_init(void); // called from process init
void* _mi_os_alloc(size_t size, mi_memid_t* memid, mi_stats_t* stats);
void _mi_os_free(void* p, size_t size, mi_memid_t memid, mi_stats_t* stats);
void _mi_os_free_ex(void* p, size_t size, bool still_committed, mi_memid_t memid, mi_stats_t* stats);
void _mi_os_init(void); // called from process init
void* _mi_os_alloc(size_t size, mi_memid_t* memid);
void _mi_os_free(void* p, size_t size, mi_memid_t memid);
void _mi_os_free_ex(void* p, size_t size, bool still_committed, mi_memid_t memid);
size_t _mi_os_page_size(void);
size_t _mi_os_good_alloc_size(size_t size);
bool _mi_os_has_overcommit(void);
bool _mi_os_has_virtual_reserve(void);
size_t _mi_os_page_size(void);
size_t _mi_os_good_alloc_size(size_t size);
bool _mi_os_has_overcommit(void);
bool _mi_os_has_virtual_reserve(void);
bool _mi_os_reset(void* addr, size_t size, mi_stats_t* tld_stats);
bool _mi_os_commit(void* p, size_t size, bool* is_zero, mi_stats_t* stats);
bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* stats);
bool _mi_os_protect(void* addr, size_t size);
bool _mi_os_unprotect(void* addr, size_t size);
bool _mi_os_purge(void* p, size_t size, mi_stats_t* stats);
bool _mi_os_purge_ex(void* p, size_t size, bool allow_reset, mi_stats_t* stats);
bool _mi_os_reset(void* addr, size_t size);
bool _mi_os_commit(void* p, size_t size, bool* is_zero);
bool _mi_os_decommit(void* addr, size_t size);
bool _mi_os_protect(void* addr, size_t size);
bool _mi_os_unprotect(void* addr, size_t size);
bool _mi_os_purge(void* p, size_t size);
bool _mi_os_purge_ex(void* p, size_t size, bool allow_reset, size_t stat_size);
void* _mi_os_alloc_aligned(size_t size, size_t alignment, bool commit, bool allow_large, mi_memid_t* memid, mi_stats_t* stats);
void* _mi_os_alloc_aligned_at_offset(size_t size, size_t alignment, size_t align_offset, bool commit, bool allow_large, mi_memid_t* memid, mi_stats_t* tld_stats);
void* _mi_os_alloc_aligned(size_t size, size_t alignment, bool commit, bool allow_large, mi_memid_t* memid);
void* _mi_os_alloc_aligned_at_offset(size_t size, size_t alignment, size_t align_offset, bool commit, bool allow_large, mi_memid_t* memid);
void* _mi_os_get_aligned_hint(size_t try_alignment, size_t size);
bool _mi_os_use_large_page(size_t size, size_t alignment);
size_t _mi_os_large_page_size(void);
void* _mi_os_get_aligned_hint(size_t try_alignment, size_t size);
bool _mi_os_use_large_page(size_t size, size_t alignment);
size_t _mi_os_large_page_size(void);
void* _mi_os_alloc_huge_os_pages(size_t pages, int numa_node, mi_msecs_t max_secs, size_t* pages_reserved, size_t* psize, mi_memid_t* memid);
void* _mi_os_alloc_huge_os_pages(size_t pages, int numa_node, mi_msecs_t max_secs, size_t* pages_reserved, size_t* psize, mi_memid_t* memid);
// arena.c
mi_arena_id_t _mi_arena_id_none(void);
void _mi_arena_free(void* p, size_t size, size_t still_committed_size, mi_memid_t memid, mi_stats_t* stats);
void* _mi_arena_alloc(size_t size, bool commit, bool allow_large, mi_arena_id_t req_arena_id, mi_memid_t* memid, mi_os_tld_t* tld);
void* _mi_arena_alloc_aligned(size_t size, size_t alignment, size_t align_offset, bool commit, bool allow_large, mi_arena_id_t req_arena_id, mi_memid_t* memid, mi_os_tld_t* tld);
bool _mi_arena_memid_is_suitable(mi_memid_t memid, mi_arena_id_t request_arena_id);
bool _mi_arena_contains(const void* p);
void _mi_arenas_collect(bool force_purge, mi_stats_t* stats);
void _mi_arena_unsafe_destroy_all(mi_stats_t* stats);
void _mi_arena_free(void* p, size_t size, size_t still_committed_size, mi_memid_t memid);
void* _mi_arena_alloc(size_t size, bool commit, bool allow_large, mi_arena_id_t req_arena_id, mi_memid_t* memid);
void* _mi_arena_alloc_aligned(size_t size, size_t alignment, size_t align_offset, bool commit, bool allow_large, mi_arena_id_t req_arena_id, mi_memid_t* memid);
bool _mi_arena_memid_is_suitable(mi_memid_t memid, mi_arena_id_t request_arena_id);
bool _mi_arena_contains(const void* p);
void _mi_arenas_collect(bool force_purge);
void _mi_arena_unsafe_destroy_all(void);
bool _mi_arena_segment_clear_abandoned(mi_segment_t* segment);
void _mi_arena_segment_mark_abandoned(mi_segment_t* segment);
bool _mi_arena_segment_clear_abandoned(mi_segment_t* segment);
void _mi_arena_segment_mark_abandoned(mi_segment_t* segment);
void* _mi_arena_meta_zalloc(size_t size, mi_memid_t* memid);
void _mi_arena_meta_free(void* p, mi_memid_t memid, size_t size);
void* _mi_arena_meta_zalloc(size_t size, mi_memid_t* memid);
void _mi_arena_meta_free(void* p, mi_memid_t memid, size_t size);
typedef struct mi_arena_field_cursor_s { // abstract struct
size_t os_list_count; // max entries to visit in the OS abandoned list
@ -144,61 +165,64 @@ mi_segment_t* _mi_arena_segment_clear_abandoned_next(mi_arena_field_cursor_t* pr
void _mi_arena_field_cursor_done(mi_arena_field_cursor_t* current);
// "segment-map.c"
void _mi_segment_map_allocated_at(const mi_segment_t* segment);
void _mi_segment_map_freed_at(const mi_segment_t* segment);
void _mi_segment_map_allocated_at(const mi_segment_t* segment);
void _mi_segment_map_freed_at(const mi_segment_t* segment);
void _mi_segment_map_unsafe_destroy(void);
// "segment.c"
mi_page_t* _mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, size_t page_alignment, mi_segments_tld_t* tld, mi_os_tld_t* os_tld);
void _mi_segment_page_free(mi_page_t* page, bool force, mi_segments_tld_t* tld);
void _mi_segment_page_abandon(mi_page_t* page, mi_segments_tld_t* tld);
uint8_t* _mi_segment_page_start(const mi_segment_t* segment, const mi_page_t* page, size_t* page_size);
mi_page_t* _mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, size_t page_alignment, mi_segments_tld_t* tld);
void _mi_segment_page_free(mi_page_t* page, bool force, mi_segments_tld_t* tld);
void _mi_segment_page_abandon(mi_page_t* page, mi_segments_tld_t* tld);
uint8_t* _mi_segment_page_start(const mi_segment_t* segment, const mi_page_t* page, size_t* page_size);
#if MI_HUGE_PAGE_ABANDON
void _mi_segment_huge_page_free(mi_segment_t* segment, mi_page_t* page, mi_block_t* block);
void _mi_segment_huge_page_free(mi_segment_t* segment, mi_page_t* page, mi_block_t* block);
#else
void _mi_segment_huge_page_reset(mi_segment_t* segment, mi_page_t* page, mi_block_t* block);
void _mi_segment_huge_page_reset(mi_segment_t* segment, mi_page_t* page, mi_block_t* block);
#endif
void _mi_segments_collect(bool force, mi_segments_tld_t* tld);
void _mi_abandoned_reclaim_all(mi_heap_t* heap, mi_segments_tld_t* tld);
bool _mi_segment_attempt_reclaim(mi_heap_t* heap, mi_segment_t* segment);
bool _mi_segment_visit_blocks(mi_segment_t* segment, int heap_tag, bool visit_blocks, mi_block_visit_fun* visitor, void* arg);
void _mi_segments_collect(bool force, mi_segments_tld_t* tld);
void _mi_abandoned_reclaim_all(mi_heap_t* heap, mi_segments_tld_t* tld);
bool _mi_segment_attempt_reclaim(mi_heap_t* heap, mi_segment_t* segment);
bool _mi_segment_visit_blocks(mi_segment_t* segment, int heap_tag, bool visit_blocks, mi_block_visit_fun* visitor, void* arg);
// "page.c"
void* _mi_malloc_generic(mi_heap_t* heap, size_t size, bool zero, size_t huge_alignment) mi_attr_noexcept mi_attr_malloc;
void* _mi_malloc_generic(mi_heap_t* heap, size_t size, bool zero, size_t huge_alignment) mi_attr_noexcept mi_attr_malloc;
void _mi_page_retire(mi_page_t* page) mi_attr_noexcept; // free the page if there are no other pages with many free blocks
void _mi_page_unfull(mi_page_t* page);
void _mi_page_free(mi_page_t* page, mi_page_queue_t* pq, bool force); // free the page
void _mi_page_abandon(mi_page_t* page, mi_page_queue_t* pq); // abandon the page, to be picked up by another thread...
void _mi_heap_delayed_free_all(mi_heap_t* heap);
bool _mi_heap_delayed_free_partial(mi_heap_t* heap);
void _mi_heap_collect_retired(mi_heap_t* heap, bool force);
void _mi_page_retire(mi_page_t* page) mi_attr_noexcept; // free the page if there are no other pages with many free blocks
void _mi_page_unfull(mi_page_t* page);
void _mi_page_free(mi_page_t* page, mi_page_queue_t* pq, bool force); // free the page
void _mi_page_abandon(mi_page_t* page, mi_page_queue_t* pq); // abandon the page, to be picked up by another thread...
void _mi_page_force_abandon(mi_page_t* page);
void _mi_page_use_delayed_free(mi_page_t* page, mi_delayed_t delay, bool override_never);
bool _mi_page_try_use_delayed_free(mi_page_t* page, mi_delayed_t delay, bool override_never);
size_t _mi_page_queue_append(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_queue_t* append);
void _mi_deferred_free(mi_heap_t* heap, bool force);
void _mi_heap_delayed_free_all(mi_heap_t* heap);
bool _mi_heap_delayed_free_partial(mi_heap_t* heap);
void _mi_heap_collect_retired(mi_heap_t* heap, bool force);
void _mi_page_free_collect(mi_page_t* page,bool force);
void _mi_page_reclaim(mi_heap_t* heap, mi_page_t* page); // callback from segments
void _mi_page_use_delayed_free(mi_page_t* page, mi_delayed_t delay, bool override_never);
bool _mi_page_try_use_delayed_free(mi_page_t* page, mi_delayed_t delay, bool override_never);
size_t _mi_page_queue_append(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_queue_t* append);
void _mi_deferred_free(mi_heap_t* heap, bool force);
size_t _mi_bin_size(uint8_t bin); // for stats
uint8_t _mi_bin(size_t size); // for stats
void _mi_page_free_collect(mi_page_t* page,bool force);
void _mi_page_reclaim(mi_heap_t* heap, mi_page_t* page); // callback from segments
size_t _mi_bin_size(uint8_t bin); // for stats
uint8_t _mi_bin(size_t size); // for stats
// "heap.c"
void _mi_heap_init(mi_heap_t* heap, mi_tld_t* tld, mi_arena_id_t arena_id, bool noreclaim, uint8_t tag);
void _mi_heap_destroy_pages(mi_heap_t* heap);
void _mi_heap_collect_abandon(mi_heap_t* heap);
void _mi_heap_set_default_direct(mi_heap_t* heap);
bool _mi_heap_memid_is_suitable(mi_heap_t* heap, mi_memid_t memid);
void _mi_heap_unsafe_destroy_all(void);
mi_heap_t* _mi_heap_by_tag(mi_heap_t* heap, uint8_t tag);
void _mi_heap_area_init(mi_heap_area_t* area, mi_page_t* page);
bool _mi_heap_area_visit_blocks(const mi_heap_area_t* area, mi_page_t* page, mi_block_visit_fun* visitor, void* arg);
void _mi_heap_init(mi_heap_t* heap, mi_tld_t* tld, mi_arena_id_t arena_id, bool noreclaim, uint8_t tag);
void _mi_heap_destroy_pages(mi_heap_t* heap);
void _mi_heap_collect_abandon(mi_heap_t* heap);
void _mi_heap_set_default_direct(mi_heap_t* heap);
bool _mi_heap_memid_is_suitable(mi_heap_t* heap, mi_memid_t memid);
void _mi_heap_unsafe_destroy_all(mi_heap_t* heap);
mi_heap_t* _mi_heap_by_tag(mi_heap_t* heap, uint8_t tag);
void _mi_heap_area_init(mi_heap_area_t* area, mi_page_t* page);
bool _mi_heap_area_visit_blocks(const mi_heap_area_t* area, mi_page_t* page, mi_block_visit_fun* visitor, void* arg);
// "stats.c"
void _mi_stats_done(mi_stats_t* stats);
void _mi_stats_done(mi_stats_t* stats);
mi_msecs_t _mi_clock_now(void);
mi_msecs_t _mi_clock_end(mi_msecs_t start);
mi_msecs_t _mi_clock_start(void);
@ -215,18 +239,6 @@ bool _mi_free_delayed_block(mi_block_t* block);
void _mi_free_generic(mi_segment_t* segment, mi_page_t* page, bool is_local, void* p) mi_attr_noexcept; // for runtime integration
void _mi_padding_shrink(const mi_page_t* page, const mi_block_t* block, const size_t min_size);
// "libc.c"
#include <stdarg.h>
void _mi_vsnprintf(char* buf, size_t bufsize, const char* fmt, va_list args);
void _mi_snprintf(char* buf, size_t buflen, const char* fmt, ...);
char _mi_toupper(char c);
int _mi_strnicmp(const char* s, const char* t, size_t n);
void _mi_strlcpy(char* dest, const char* src, size_t dest_size);
void _mi_strlcat(char* dest, const char* src, size_t dest_size);
size_t _mi_strlen(const char* s);
size_t _mi_strnlen(const char* s, size_t max_len);
bool _mi_getenv(const char* name, char* result, size_t result_size);
#if MI_DEBUG>1
bool _mi_page_is_valid(mi_page_t* page);
#endif
@ -322,6 +334,7 @@ static inline uintptr_t _mi_align_up(uintptr_t sz, size_t alignment) {
}
}
// Align a pointer upwards
static inline void* mi_align_up_ptr(void* p, size_t alignment) {
return (void*)_mi_align_up((uintptr_t)p, alignment);
@ -402,7 +415,7 @@ static inline bool mi_count_size_overflow(size_t count, size_t size, size_t* tot
Heap functions
------------------------------------------------------------------------------------------- */
extern const mi_heap_t _mi_heap_empty; // read-only empty heap, initial value of the thread local default heap
extern mi_decl_hidden const mi_heap_t _mi_heap_empty; // read-only empty heap, initial value of the thread local default heap
static inline bool mi_heap_is_backing(const mi_heap_t* heap) {
return (heap->tld->heap_backing == heap);
@ -410,11 +423,11 @@ static inline bool mi_heap_is_backing(const mi_heap_t* heap) {
static inline bool mi_heap_is_initialized(mi_heap_t* heap) {
mi_assert_internal(heap != NULL);
return (heap != &_mi_heap_empty);
return (heap != NULL && heap != &_mi_heap_empty);
}
static inline uintptr_t _mi_ptr_cookie(const void* p) {
extern mi_heap_t _mi_heap_main;
extern mi_decl_hidden mi_heap_t _mi_heap_main;
mi_assert_internal(_mi_heap_main.cookie != 0);
return ((uintptr_t)p ^ _mi_heap_main.cookie);
}
@ -562,7 +575,7 @@ static inline bool mi_page_immediate_available(const mi_page_t* page) {
}
// is more than 7/8th of a page in use?
static inline bool mi_page_mostly_used(const mi_page_t* page) {
static inline bool mi_page_is_mostly_used(const mi_page_t* page) {
if (page==NULL) return true;
uint16_t frac = page->reserved / 8U;
return (page->reserved - page->used <= frac);
@ -593,6 +606,39 @@ static inline void mi_page_set_has_aligned(mi_page_t* page, bool has_aligned) {
page->flags.x.has_aligned = has_aligned;
}
/* -------------------------------------------------------------------
Guarded objects
------------------------------------------------------------------- */
#if MI_GUARDED
static inline bool mi_block_ptr_is_guarded(const mi_block_t* block, const void* p) {
const ptrdiff_t offset = (uint8_t*)p - (uint8_t*)block;
return (offset >= (ptrdiff_t)(sizeof(mi_block_t)) && block->next == MI_BLOCK_TAG_GUARDED);
}
static inline bool mi_heap_malloc_use_guarded(mi_heap_t* heap, size_t size) {
// this code is written to result in fast assembly as it is on the hot path for allocation
const size_t count = heap->guarded_sample_count - 1; // if the rate was 0, this will underflow and count for a long time..
if mi_likely(count != 0) {
// no sample
heap->guarded_sample_count = count;
return false;
}
else if (size >= heap->guarded_size_min && size <= heap->guarded_size_max) {
// use guarded allocation
heap->guarded_sample_count = heap->guarded_sample_rate; // reset
return (heap->guarded_sample_rate != 0);
}
else {
// failed size criteria, rewind count (but don't write to an empty heap)
if (heap->guarded_sample_rate != 0) { heap->guarded_sample_count = 1; }
return false;
}
}
mi_decl_restrict void* _mi_heap_malloc_guarded(mi_heap_t* heap, size_t size, bool zero) mi_attr_noexcept;
#endif
/* -------------------------------------------------------------------
Encoding/Decoding the free list next pointers
@ -651,6 +697,16 @@ static inline mi_encoded_t mi_ptr_encode(const void* null, const void* p, const
return mi_rotl(x ^ keys[1], keys[0]) + keys[0];
}
static inline uint32_t mi_ptr_encode_canary(const void* null, const void* p, const uintptr_t* keys) {
const uint32_t x = (uint32_t)(mi_ptr_encode(null,p,keys));
// make the lowest byte 0 to prevent spurious read overflows which could be a security issue (issue #951)
#ifdef MI_BIG_ENDIAN
return (x & 0x00FFFFFF);
#else
return (x & 0xFFFFFF00);
#endif
}
static inline mi_block_t* mi_block_nextx( const void* null, const mi_block_t* block, const uintptr_t* keys ) {
mi_track_mem_defined(block,sizeof(mi_block_t));
mi_block_t* next;
@ -731,7 +787,7 @@ static inline mi_memid_t _mi_memid_create_os(bool committed, bool is_zero, bool
static inline uintptr_t _mi_random_shuffle(uintptr_t x) {
if (x==0) { x = 17; } // ensure we don't get stuck in generating zeros
#if (MI_INTPTR_SIZE==8)
#if (MI_INTPTR_SIZE>=8)
// by Sebastiano Vigna, see: <http://xoshiro.di.unimi.it/splitmix64.c>
x ^= x >> 30;
x *= 0xbf58476d1ce4e5b9UL;
@ -753,13 +809,13 @@ static inline uintptr_t _mi_random_shuffle(uintptr_t x) {
// Optimize numa node access for the common case (= one node)
// -------------------------------------------------------------------
int _mi_os_numa_node_get(mi_os_tld_t* tld);
int _mi_os_numa_node_get(void);
size_t _mi_os_numa_node_count_get(void);
extern _Atomic(size_t) _mi_numa_node_count;
static inline int _mi_os_numa_node(mi_os_tld_t* tld) {
extern mi_decl_hidden _Atomic(size_t) _mi_numa_node_count;
static inline int _mi_os_numa_node(void) {
if mi_likely(mi_atomic_load_relaxed(&_mi_numa_node_count) == 1) { return 0; }
else return _mi_os_numa_node_get(tld);
else return _mi_os_numa_node_get();
}
static inline size_t _mi_os_numa_node_count(void) {
const size_t count = mi_atomic_load_relaxed(&_mi_numa_node_count);
@ -821,16 +877,18 @@ static inline size_t mi_ctz(uintptr_t x) {
}
#else
static inline size_t mi_ctz32(uint32_t x) {
static inline size_t mi_ctz_generic32(uint32_t x) {
// de Bruijn multiplication, see <http://supertech.csail.mit.edu/papers/debruijn.pdf>
static const unsigned char debruijn[32] = {
static const uint8_t debruijn[32] = {
0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,
31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
};
if (x==0) return 32;
return debruijn[((x & -(int32_t)x) * 0x077CB531UL) >> 27];
return debruijn[(uint32_t)((x & -(int32_t)x) * (uint32_t)(0x077CB531U)) >> 27];
}
static inline size_t mi_clz32(uint32_t x) {
static inline size_t mi_clz_generic32(uint32_t x) {
// de Bruijn multiplication, see <http://supertech.csail.mit.edu/papers/debruijn.pdf>
static const uint8_t debruijn[32] = {
31, 22, 30, 21, 18, 10, 29, 2, 20, 17, 15, 13, 9, 6, 28, 1,
@ -842,28 +900,37 @@ static inline size_t mi_clz32(uint32_t x) {
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
return debruijn[(uint32_t)(x * 0x07C4ACDDUL) >> 27];
return debruijn[(uint32_t)(x * (uint32_t)(0x07C4ACDDU)) >> 27];
}
static inline size_t mi_clz(uintptr_t x) {
if (x==0) return MI_INTPTR_BITS;
#if (MI_INTPTR_BITS <= 32)
return mi_clz32((uint32_t)x);
#else
size_t count = mi_clz32((uint32_t)(x >> 32));
if (count < 32) return count;
return (32 + mi_clz32((uint32_t)x));
#endif
static inline size_t mi_ctz(size_t x) {
if (x==0) return MI_SIZE_BITS;
#if (MI_SIZE_BITS <= 32)
return mi_ctz_generic32((uint32_t)x);
#else
const uint32_t lo = (uint32_t)x;
if (lo != 0) {
return mi_ctz_generic32(lo);
}
else {
return (32 + mi_ctz_generic32((uint32_t)(x>>32)));
}
#endif
}
static inline size_t mi_ctz(uintptr_t x) {
if (x==0) return MI_INTPTR_BITS;
#if (MI_INTPTR_BITS <= 32)
return mi_ctz32((uint32_t)x);
#else
size_t count = mi_ctz32((uint32_t)x);
if (count < 32) return count;
return (32 + mi_ctz32((uint32_t)(x>>32)));
#endif
static inline size_t mi_clz(size_t x) {
if (x==0) return MI_SIZE_BITS;
#if (MI_SIZE_BITS <= 32)
return mi_clz_generic32((uint32_t)x);
#else
const uint32_t hi = (uint32_t)(x>>32);
if (hi != 0) {
return mi_clz_generic32(hi);
}
else {
return 32 + mi_clz_generic32((uint32_t)x);
}
#endif
}
#endif
@ -885,8 +952,9 @@ static inline size_t mi_bsr(uintptr_t x) {
#if !MI_TRACK_ENABLED && defined(_WIN32) && (defined(_M_IX86) || defined(_M_X64))
#include <intrin.h>
extern bool _mi_cpu_has_fsrm;
extern bool _mi_cpu_has_erms;
static inline void _mi_memcpy(void* dst, const void* src, size_t n) {
if (_mi_cpu_has_fsrm) {
if ((_mi_cpu_has_fsrm && n <= 128) || (_mi_cpu_has_erms && n > 128)) {
__movsb((unsigned char*)dst, (const unsigned char*)src, n);
}
else {
@ -894,7 +962,7 @@ static inline void _mi_memcpy(void* dst, const void* src, size_t n) {
}
}
static inline void _mi_memzero(void* dst, size_t n) {
if (_mi_cpu_has_fsrm) {
if ((_mi_cpu_has_fsrm && n <= 128) || (_mi_cpu_has_erms && n > 128)) {
__stosb((unsigned char*)dst, 0, n);
}
else {

82
include/mimalloc/prim.h
View file

@ -1,5 +1,5 @@
/* ----------------------------------------------------------------------------
Copyright (c) 2018-2023, Microsoft Research, Daan Leijen
Copyright (c) 2018-2024, Microsoft Research, Daan Leijen
This is free software; you can redistribute it and/or modify it under the
terms of the MIT license. A copy of the license can be found in the file
"LICENSE" at the root of this distribution.
@ -25,6 +25,8 @@ typedef struct mi_os_mem_config_s {
size_t page_size; // default to 4KiB
size_t large_page_size; // 0 if not supported, usually 2MiB (4MiB on Windows)
size_t alloc_granularity; // smallest allocation size (usually 4KiB, on Windows 64KiB)
size_t physical_memory; // physical memory size
size_t virtual_address_bits; // usually 48 or 56 bits on 64-bit systems. (used to determine secure randomization)
bool has_overcommit; // can we reserve more memory than can be actually committed?
bool has_partial_free; // can allocated blocks be freed partially? (true for mmap, false for VirtualAlloc)
bool has_virtual_reserve; // supports virtual address space reservation? (if true we can reserve virtual address space without using commit or physical memory)
@ -41,9 +43,10 @@ int _mi_prim_free(void* addr, size_t size );
// If `commit` is false, the virtual memory range only needs to be reserved (with no access)
// which will later be committed explicitly using `_mi_prim_commit`.
// `is_zero` is set to true if the memory was zero initialized (as on most OS's)
// The `hint_addr` address is either `NULL` or a preferred allocation address but can be ignored.
// pre: !commit => !allow_large
// try_alignment >= _mi_os_page_size() and a power of 2
int _mi_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr);
int _mi_prim_alloc(void* hint_addr, size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr);
// Commit memory. Returns error code or 0 on success.
// For example, on Linux this would make the memory PROT_READ|PROT_WRITE.
@ -116,14 +119,13 @@ void _mi_prim_thread_associate_default_heap(mi_heap_t* heap);
//-------------------------------------------------------------------
// Thread id: `_mi_prim_thread_id()`
//
// Getting the thread id should be performant as it is called in the
// fast path of `_mi_free` and we specialize for various platforms as
// inlined definitions. Regular code should call `init.c:_mi_thread_id()`.
// We only require _mi_prim_thread_id() to return a unique id
// for each thread (unequal to zero).
// Access to TLS (thread local storage) slots.
// We need fast access to both a unique thread id (in `free.c:mi_free`) and
// to a thread-local heap pointer (in `alloc.c:mi_malloc`).
// To achieve this we use specialized code for various platforms.
//-------------------------------------------------------------------
// On some libc + platform combinations we can directly access a thread-local storage (TLS) slot.
@ -135,14 +137,14 @@ void _mi_prim_thread_associate_default_heap(mi_heap_t* heap);
// but unfortunately we can not detect support reliably (see issue #883)
// We also use it on Apple OS as we use a TLS slot for the default heap there.
#if defined(__GNUC__) && ( \
(defined(__GLIBC__) && (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))) \
(defined(__GLIBC__) && (defined(__x86_64__) || defined(__i386__) || (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__))) \
|| (defined(__APPLE__) && (defined(__x86_64__) || defined(__aarch64__) || defined(__POWERPC__))) \
|| (defined(__BIONIC__) && (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))) \
|| (defined(__BIONIC__) && (defined(__x86_64__) || defined(__i386__) || (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__))) \
|| (defined(__FreeBSD__) && (defined(__x86_64__) || defined(__i386__) || defined(__aarch64__))) \
|| (defined(__OpenBSD__) && (defined(__x86_64__) || defined(__i386__) || defined(__aarch64__))) \
)
#define MI_HAS_TLS_SLOT
#define MI_HAS_TLS_SLOT 1
static inline void* mi_prim_tls_slot(size_t slot) mi_attr_noexcept {
void* res;
@ -203,8 +205,52 @@ static inline void mi_prim_tls_slot_set(size_t slot, void* value) mi_attr_noexce
#endif
}
#elif _WIN32 && MI_WIN_USE_FIXED_TLS && !defined(MI_WIN_USE_FLS)
// On windows we can store the thread-local heap at a fixed TLS slot to avoid
// thread-local initialization checks in the fast path. This uses a fixed location
// in the TCB though (last user-reserved slot by default) which may clash with other applications.
#define MI_HAS_TLS_SLOT 2 // 2 = we can reliable initialize the slot (saving a test on each malloc)
#if MI_WIN_USE_FIXED_TLS > 1
#define MI_TLS_SLOT (MI_WIN_USE_FIXED_TLS)
#elif MI_SIZE_SIZE == 4
#define MI_TLS_SLOT (0x710) // Last user-reserved slot <https://en.wikipedia.org/wiki/Win32_Thread_Information_Block>
// #define MI_TLS_SLOT (0xF0C) // Last TlsSlot (might clash with other app reserved slot)
#else
#define MI_TLS_SLOT (0x888) // Last user-reserved slot <https://en.wikipedia.org/wiki/Win32_Thread_Information_Block>
// #define MI_TLS_SLOT (0x1678) // Last TlsSlot (might clash with other app reserved slot)
#endif
static inline void* mi_prim_tls_slot(size_t slot) mi_attr_noexcept {
#if (_M_X64 || _M_AMD64) && !defined(_M_ARM64EC)
return (void*)__readgsqword((unsigned long)slot); // direct load at offset from gs
#elif _M_IX86 && !defined(_M_ARM64EC)
return (void*)__readfsdword((unsigned long)slot); // direct load at offset from fs
#else
return ((void**)NtCurrentTeb())[slot / sizeof(void*)];
#endif
}
static inline void mi_prim_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
((void**)NtCurrentTeb())[slot / sizeof(void*)] = value;
}
#endif
//-------------------------------------------------------------------
// Get a fast unique thread id.
//
// Getting the thread id should be performant as it is called in the
// fast path of `_mi_free` and we specialize for various platforms as
// inlined definitions. Regular code should call `init.c:_mi_thread_id()`.
// We only require _mi_prim_thread_id() to return a unique id
// for each thread (unequal to zero).
//-------------------------------------------------------------------
// Do we have __builtin_thread_pointer? This would be the preferred way to get a unique thread id
// but unfortunately, it seems we cannot test for this reliably at this time (see issue #883)
// Nevertheless, it seems needed on older graviton platforms (see issue #851).
@ -248,7 +294,7 @@ static inline mi_threadid_t _mi_prim_thread_id(void) mi_attr_noexcept {
return (uintptr_t)__builtin_thread_pointer();
}
#elif defined(MI_HAS_TLS_SLOT)
#elif MI_HAS_TLS_SLOT
static inline mi_threadid_t _mi_prim_thread_id(void) mi_attr_noexcept {
#if defined(__BIONIC__)
@ -275,7 +321,8 @@ static inline mi_threadid_t _mi_prim_thread_id(void) mi_attr_noexcept {
/* ----------------------------------------------------------------------------------------
The thread local default heap: `_mi_prim_get_default_heap()`
Get the thread local default heap: `_mi_prim_get_default_heap()`
This is inlined here as it is on the fast path for allocation functions.
On most platforms (Windows, Linux, FreeBSD, NetBSD, etc), this just returns a
@ -312,19 +359,21 @@ static inline mi_heap_t* mi_prim_get_default_heap(void);
#endif
#if defined(MI_TLS_SLOT)
#if MI_TLS_SLOT
# if !defined(MI_HAS_TLS_SLOT)
# error "trying to use a TLS slot for the default heap, but the mi_prim_tls_slot primitives are not defined"
# endif
static inline mi_heap_t* mi_prim_get_default_heap(void) {
mi_heap_t* heap = (mi_heap_t*)mi_prim_tls_slot(MI_TLS_SLOT);
#if MI_HAS_TLS_SLOT == 1 // check if the TLS slot is initialized
if mi_unlikely(heap == NULL) {
#ifdef __GNUC__
__asm(""); // prevent conditional load of the address of _mi_heap_empty
#endif
heap = (mi_heap_t*)&_mi_heap_empty;
}
#endif
return heap;
}
@ -366,7 +415,4 @@ static inline mi_heap_t* mi_prim_get_default_heap(void) {
#endif // mi_prim_get_default_heap()
#endif // MIMALLOC_PRIM_H

52
include/mimalloc/types.h
View file

@ -72,6 +72,13 @@ terms of the MIT license. A copy of the license can be found in the file
#endif
#endif
// Use guard pages behind objects of a certain size (set by the MIMALLOC_DEBUG_GUARDED_MIN/MAX options)
// Padding should be disabled when using guard pages
// #define MI_GUARDED 1
#if defined(MI_GUARDED)
#define MI_PADDING 0
#endif
// Reserve extra padding at the end of each block to be more resilient against heap block overflows.
// The padding can detect buffer overflow on free.
#if !defined(MI_PADDING) && (MI_SECURE>=3 || MI_DEBUG>=1 || (MI_TRACK_VALGRIND || MI_TRACK_ASAN || MI_TRACK_ETW))
@ -225,6 +232,13 @@ typedef struct mi_block_s {
mi_encoded_t next;
} mi_block_t;
#if MI_GUARDED
// we always align guarded pointers in a block at an offset
// the block `next` field is then used as a tag to distinguish regular offset aligned blocks from guarded ones
#define MI_BLOCK_TAG_ALIGNED ((mi_encoded_t)(0))
#define MI_BLOCK_TAG_GUARDED (~MI_BLOCK_TAG_ALIGNED)
#endif
// The delayed flags are used for efficient multi-threaded free-ing
typedef enum mi_delayed_e {
@ -248,7 +262,7 @@ typedef union mi_page_flags_s {
#else
// under thread sanitizer, use a byte for each flag to suppress warning, issue #130
typedef union mi_page_flags_s {
uint16_t full_aligned;
uint32_t full_aligned;
struct {
uint8_t in_full;
uint8_t has_aligned;
@ -363,7 +377,7 @@ static inline bool mi_memkind_is_os(mi_memkind_t memkind) {
typedef struct mi_memid_os_info {
void* base; // actual base address of the block (used for offset aligned allocations)
size_t alignment; // alignment at allocation
size_t size; // full allocation size
} mi_memid_os_info_t;
typedef struct mi_memid_arena_info {
@ -402,7 +416,8 @@ typedef struct mi_segment_s {
// segment fields
struct mi_segment_s* next; // must be the first (non-constant) segment field -- see `segment.c:segment_init`
struct mi_segment_s* prev;
bool was_reclaimed; // true if it was reclaimed (used to limit on-free reclamation)
bool was_reclaimed; // true if it was reclaimed (used to limit reclaim-on-free reclamation)
bool dont_free; // can be temporarily true to ensure the segment is not freed
size_t abandoned; // abandoned pages (i.e. the original owning thread stopped) (`abandoned <= used`)
size_t abandoned_visits; // count how often this segment is visited for reclaiming (to force reclaim if it is too long)
@ -488,6 +503,13 @@ struct mi_heap_s {
mi_heap_t* next; // list of heaps per thread
bool no_reclaim; // `true` if this heap should not reclaim abandoned pages
uint8_t tag; // custom tag, can be used for separating heaps based on the object types
#if MI_GUARDED
size_t guarded_size_min; // minimal size for guarded objects
size_t guarded_size_max; // maximal size for guarded objects
size_t guarded_sample_rate; // sample rate (set to 0 to disable guarded pages)
size_t guarded_sample_seed; // starting sample count
size_t guarded_sample_count; // current sample count (counting down to 0)
#endif
mi_page_t* pages_free_direct[MI_PAGES_DIRECT]; // optimize: array where every entry points a page with possibly free blocks in the corresponding queue for that size.
mi_page_queue_t pages[MI_BIN_FULL + 1]; // queue of pages for each size class (or "bin")
};
@ -580,24 +602,34 @@ typedef struct mi_stats_s {
mi_stat_counter_t arena_count;
mi_stat_counter_t arena_crossover_count;
mi_stat_counter_t arena_rollback_count;
mi_stat_counter_t guarded_alloc_count;
#if MI_STAT>1
mi_stat_count_t normal_bins[MI_BIN_HUGE+1];
#endif
} mi_stats_t;
// add to stat keeping track of the peak
void _mi_stat_increase(mi_stat_count_t* stat, size_t amount);
void _mi_stat_decrease(mi_stat_count_t* stat, size_t amount);
// adjust stat in special cases to compensate for double counting
void _mi_stat_adjust_increase(mi_stat_count_t* stat, size_t amount);
void _mi_stat_adjust_decrease(mi_stat_count_t* stat, size_t amount);
// counters can just be increased
void _mi_stat_counter_increase(mi_stat_counter_t* stat, size_t amount);
#if (MI_STAT)
#define mi_stat_increase(stat,amount) _mi_stat_increase( &(stat), amount)
#define mi_stat_decrease(stat,amount) _mi_stat_decrease( &(stat), amount)
#define mi_stat_counter_increase(stat,amount) _mi_stat_counter_increase( &(stat), amount)
#define mi_stat_adjust_increase(stat,amount) _mi_stat_adjust_increase( &(stat), amount)
#define mi_stat_adjust_decrease(stat,amount) _mi_stat_adjust_decrease( &(stat), amount)
#else
#define mi_stat_increase(stat,amount) (void)0
#define mi_stat_decrease(stat,amount) (void)0
#define mi_stat_counter_increase(stat,amount) (void)0
#define mi_stat_increase(stat,amount) ((void)0)
#define mi_stat_decrease(stat,amount) ((void)0)
#define mi_stat_counter_increase(stat,amount) ((void)0)
#define mi_stat_adjuct_increase(stat,amount) ((void)0)
#define mi_stat_adjust_decrease(stat,amount) ((void)0)
#endif
#define mi_heap_stat_counter_increase(heap,stat,amount) mi_stat_counter_increase( (heap)->tld->stats.stat, amount)
@ -633,12 +665,6 @@ typedef struct mi_segment_queue_s {
mi_segment_t* last;
} mi_segment_queue_t;
// OS thread local data
typedef struct mi_os_tld_s {
size_t region_idx; // start point for next allocation
mi_stats_t* stats; // points to tld stats
} mi_os_tld_t;
// Segments thread local data
typedef struct mi_segments_tld_s {
mi_segment_queue_t small_free; // queue of segments with free small pages
@ -651,7 +677,6 @@ typedef struct mi_segments_tld_s {
size_t reclaim_count;// number of reclaimed (abandoned) segments
mi_subproc_t* subproc; // sub-process this thread belongs to.
mi_stats_t* stats; // points to tld stats
mi_os_tld_t* os; // points to os tld
} mi_segments_tld_t;
// Thread local data
@ -661,7 +686,6 @@ struct mi_tld_s {
mi_heap_t* heap_backing; // backing heap of this thread (cannot be deleted)
mi_heap_t* heaps; // list of heaps in this thread (so we can abandon all when the thread terminates)
mi_segments_tld_t segments; // segment tld
mi_os_tld_t os; // os tld
mi_stats_t stats; // statistics
};

92
readme.md
View file

@ -164,7 +164,7 @@ The `mimalloc` project builds a static library (in `out/msvc-x64`), while the
`mimalloc-override` project builds a DLL for overriding malloc
in the entire program.
## macOS, Linux, BSD, etc.
## Linux, macOS, BSD, etc.
We use [`cmake`](https://cmake.org)<sup>1</sup> as the build system:
@ -200,13 +200,26 @@ free lists, etc., as:
> make
```
This will name the shared library as `libmimalloc-secure.so`.
Use `ccmake`<sup>2</sup> instead of `cmake`
to see and customize all the available build options.
Use `cmake ../.. -LH` to see all the available build options.
Notes:
1. Install CMake: `sudo apt-get install cmake`
2. Install CCMake: `sudo apt-get install cmake-curses-gui`
The examples use the default compiler. If you like to use another, use:
```
> CC=clang CXX=clang++ cmake ../..
```
## Cmake with Visual Studio
You can also use cmake on Windows. Open a Visual Studio development prompt
and invoke `cmake` with the right [generator](https://cmake.org/cmake/help/latest/generator/Visual%20Studio%2017%202022.html)
and architecture, like:
```
> cmake ..\.. -G "Visual Studio 17 2022" -A x64 -DMI_OVERRIDE=ON
```
The cmake build type is specified when actually building, for example:
```
> cmake --build . --config=Release
```
## Single source
@ -240,7 +253,7 @@ to link with the static library. See `test\CMakeLists.txt` for an example.
For best performance in C++ programs, it is also recommended to override the
global `new` and `delete` operators. For convenience, mimalloc provides
[`mimalloc-new-delete.h`](https://github.com/microsoft/mimalloc/blob/master/include/mimalloc-new-delete.h) which does this for you -- just include it in a single(!) source file in your project.
[`mimalloc-new-delete.h`](include/mimalloc-new-delete.h) which does this for you -- just include it in a single(!) source file in your project.
In C++, mimalloc also provides the `mi_stl_allocator` struct which implements the `std::allocator`
interface.
@ -415,27 +428,33 @@ Note that certain security restrictions may apply when doing this from
the [shell](https://stackoverflow.com/questions/43941322/dyld-insert-libraries-ignored-when-calling-application-through-bash).
### Dynamic Override on Windows
# Windows Override
<span id="override_on_windows">Dynamically overriding on mimalloc on Windows</span>
is robust and has the particular advantage to be able to redirect all malloc/free calls that go through
the (dynamic) C runtime allocator, including those from other DLL's or libraries.
As it intercepts all allocation calls on a low level, it can be used reliably
<span id="override_on_windows">Dynamically overriding on mimalloc on Windows</span>
is robust and has the particular advantage to be able to redirect all malloc/free calls
that go through the (dynamic) C runtime allocator, including those from other DLL's or
libraries. As it intercepts all allocation calls on a low level, it can be used reliably
on large programs that include other 3rd party components.
There are four requirements to make the overriding work robustly:
There are four requirements to make the overriding work well:
1. Use the C-runtime library as a DLL (using the `/MD` or `/MDd` switch).
2. Link your program explicitly with `mimalloc-override.dll` library.
To ensure the `mimalloc-override.dll` is loaded at run-time it is easiest to insert some
call to the mimalloc API in the `main` function, like `mi_version()`
(or use the `/INCLUDE:mi_version` switch on the linker). See the `mimalloc-override-test` project
for an example on how to use this.
3. The [`mimalloc-redirect.dll`](bin) (or `mimalloc-redirect32.dll`) must be put
in the same folder as the main `mimalloc-override.dll` at runtime (as it is a dependency of that DLL).
The redirection DLL ensures that all calls to the C runtime malloc API get redirected to
mimalloc functions (which reside in `mimalloc-override.dll`).
4. Ensure the `mimalloc-override.dll` comes as early as possible in the import
2. Link your program explicitly with the `mimalloc.lib` export library for the `mimalloc.dll`.
(which must be compiled with `-DMI_OVERRIDE=ON`, which is the default though).
To ensure the `mimalloc.dll` is actually loaded at run-time it is easiest
to insert some call to the mimalloc API in the `main` function, like `mi_version()`
(or use the `/include:mi_version` switch on the linker command, or
similarly, `#pragma comment(linker, "/include:mi_version")` in some source file).
See the `mimalloc-test-override` project for an example on how to use this.
3. The `mimalloc-redirect.dll` must be put in the same folder as the main
`mimalloc.dll` at runtime (as it is a dependency of that DLL).
The redirection DLL ensures that all calls to the C runtime malloc API get
redirected to mimalloc functions (which reside in `mimalloc.dll`).
4. Ensure the `mimalloc.dll` comes as early as possible in the import
list of the final executable (so it can intercept all potential allocations).
You can use `minject -l <exe>` to check this if needed.
For best performance on Windows with C++, it
is also recommended to also override the `new`/`delete` operations (by including
@ -443,15 +462,14 @@ is also recommended to also override the `new`/`delete` operations (by including
a single(!) source file in your project).
The environment variable `MIMALLOC_DISABLE_REDIRECT=1` can be used to disable dynamic
overriding at run-time. Use `MIMALLOC_VERBOSE=1` to check if mimalloc was successfully redirected.
overriding at run-time. Use `MIMALLOC_VERBOSE=1` to check if mimalloc was successfully
redirected.
For different platforms than x64, you may need a specific [redirection dll](bin).
Furthermore, we cannot always re-link an executable or ensure `mimalloc.dll` comes
first in the import table. In such cases the [`minject`](bin) tool can be used
to patch the executable's import tables.
We cannot always re-link an executable with `mimalloc-override.dll`, and similarly, we cannot always
ensure the the DLL comes first in the import table of the final executable.
In many cases though we can patch existing executables without any recompilation
if they are linked with the dynamic C runtime (`ucrtbase.dll`) -- just put the `mimalloc-override.dll`
into the import table (and put `mimalloc-redirect.dll` in the same folder)
Such patching can be done for example with [CFF Explorer](https://ntcore.com/?page_id=388) or
the [`minject`](bin) program.
## Static override
@ -469,7 +487,7 @@ object file. For example:
Another way to override statically that works on all platforms, is to
link statically to mimalloc (as shown in the introduction) and include a
header file in each source file that re-defines `malloc` etc. to `mi_malloc`.
This is provided by [`mimalloc-override.h`](https://github.com/microsoft/mimalloc/blob/master/include/mimalloc-override.h). This only works reliably though if all sources are
This is provided by [`mimalloc-override.h`](include/mimalloc-override.h). This only works reliably though if all sources are
under your control or otherwise mixing of pointers from different heaps may occur!
@ -505,9 +523,13 @@ you also need to tell `valgrind` to not intercept those calls itself, and use:
By setting the `MIMALLOC_SHOW_STATS` environment variable you can check that mimalloc is indeed
used and not the standard allocator. Even though the [Valgrind option][valgrind-soname]
is called `--soname-synonyms`, this also
works when overriding with a static library or object file. Unfortunately, it is not possible to
dynamically override mimalloc using `LD_PRELOAD` together with `valgrind`.
is called `--soname-synonyms`, this also works when overriding with a static library or object file.
To dynamically override mimalloc using `LD_PRELOAD` together with `valgrind`, use:
```
> valgrind --trace-children=yes --soname-synonyms=somalloc=*mimalloc* /usr/bin/env LD_PRELOAD=/usr/lib/libmimalloc.so -- <myprogram>
```
See also the `test/test-wrong.c` file to test with `valgrind`.
Valgrind support is in its initial development -- please report any issues.

77
src/alloc-aligned.c
View file

@ -24,6 +24,33 @@ static bool mi_malloc_is_naturally_aligned( size_t size, size_t alignment ) {
return (bsize <= MI_MAX_ALIGN_GUARANTEE && (bsize & (alignment-1)) == 0);
}
#if MI_GUARDED
static mi_decl_restrict void* mi_heap_malloc_guarded_aligned(mi_heap_t* heap, size_t size, size_t alignment, bool zero) mi_attr_noexcept {
// use over allocation for guarded blocksl
mi_assert_internal(alignment > 0 && alignment < MI_BLOCK_ALIGNMENT_MAX);
const size_t oversize = size + alignment - 1;
void* base = _mi_heap_malloc_guarded(heap, oversize, zero);
void* p = mi_align_up_ptr(base, alignment);
mi_track_align(base, p, (uint8_t*)p - (uint8_t*)base, size);
mi_assert_internal(mi_usable_size(p) >= size);
mi_assert_internal(_mi_is_aligned(p, alignment));
return p;
}
static void* mi_heap_malloc_zero_no_guarded(mi_heap_t* heap, size_t size, bool zero) {
const size_t rate = heap->guarded_sample_rate;
// only write if `rate!=0` so we don't write to the constant `_mi_heap_empty`
if (rate != 0) { heap->guarded_sample_rate = 0; }
void* p = _mi_heap_malloc_zero(heap, size, zero);
if (rate != 0) { heap->guarded_sample_rate = rate; }
return p;
}
#else
static void* mi_heap_malloc_zero_no_guarded(mi_heap_t* heap, size_t size, bool zero) {
return _mi_heap_malloc_zero(heap, size, zero);
}
#endif
// Fallback aligned allocation that over-allocates -- split out for better codegen
static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_overalloc(mi_heap_t* const heap, const size_t size, const size_t alignment, const size_t offset, const bool zero) mi_attr_noexcept
{
@ -38,12 +65,13 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_overalloc(mi_heap_t
// first (and single) page such that the segment info is `MI_SEGMENT_SIZE` bytes before it (so it can be found by aligning the pointer down)
if mi_unlikely(offset != 0) {
// todo: cannot support offset alignment for very large alignments yet
#if MI_DEBUG > 0
#if MI_DEBUG > 0
_mi_error_message(EOVERFLOW, "aligned allocation with a very large alignment cannot be used with an alignment offset (size %zu, alignment %zu, offset %zu)\n", size, alignment, offset);
#endif
#endif
return NULL;
}
oversize = (size <= MI_SMALL_SIZE_MAX ? MI_SMALL_SIZE_MAX + 1 /* ensure we use generic malloc path */ : size);
// note: no guarded as alignment > 0
p = _mi_heap_malloc_zero_ex(heap, oversize, false, alignment); // the page block size should be large enough to align in the single huge page block
// zero afterwards as only the area from the aligned_p may be committed!
if (p == NULL) return NULL;
@ -51,9 +79,10 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_overalloc(mi_heap_t
else {
// otherwise over-allocate
oversize = size + alignment - 1;
p = _mi_heap_malloc_zero(heap, oversize, zero);
p = mi_heap_malloc_zero_no_guarded(heap, oversize, zero);
if (p == NULL) return NULL;
}
mi_page_t* page = _mi_ptr_page(p);
// .. and align within the allocation
const uintptr_t align_mask = alignment - 1; // for any x, `(x & align_mask) == (x % alignment)`
@ -62,17 +91,27 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_overalloc(mi_heap_t
mi_assert_internal(adjust < alignment);
void* aligned_p = (void*)((uintptr_t)p + adjust);
if (aligned_p != p) {
mi_page_t* page = _mi_ptr_page(p);
mi_page_set_has_aligned(page, true);
#if MI_GUARDED
// set tag to aligned so mi_usable_size works with guard pages
if (adjust >= sizeof(mi_block_t)) {
mi_block_t* const block = (mi_block_t*)p;
block->next = MI_BLOCK_TAG_ALIGNED;
}
#endif
_mi_padding_shrink(page, (mi_block_t*)p, adjust + size);
}
// todo: expand padding if overallocated ?
mi_assert_internal(mi_page_usable_block_size(_mi_ptr_page(p)) >= adjust + size);
mi_assert_internal(p == _mi_page_ptr_unalign(_mi_ptr_page(aligned_p), aligned_p));
mi_assert_internal(mi_page_usable_block_size(page) >= adjust + size);
mi_assert_internal(((uintptr_t)aligned_p + offset) % alignment == 0);
mi_assert_internal(mi_usable_size(aligned_p)>=size);
mi_assert_internal(mi_usable_size(p) == mi_usable_size(aligned_p)+adjust);
#if MI_DEBUG > 1
mi_page_t* const apage = _mi_ptr_page(aligned_p);
void* unalign_p = _mi_page_ptr_unalign(apage, aligned_p);
mi_assert_internal(p == unalign_p);
#endif
// now zero the block if needed
if (alignment > MI_BLOCK_ALIGNMENT_MAX) {
@ -85,6 +124,9 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_overalloc(mi_heap_t
if (p != aligned_p) {
mi_track_align(p,aligned_p,adjust,mi_usable_size(aligned_p));
#if MI_GUARDED
mi_track_mem_defined(p, sizeof(mi_block_t));
#endif
}
return aligned_p;
}
@ -94,27 +136,27 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_generic(mi_heap_t*
{
mi_assert_internal(alignment != 0 && _mi_is_power_of_two(alignment));
// we don't allocate more than MI_MAX_ALLOC_SIZE (see <https://sourceware.org/ml/libc-announce/2019/msg00001.html>)
if mi_unlikely(size > (MI_MAX_ALLOC_SIZE - MI_PADDING_SIZE)) {
if mi_unlikely(size > (MI_MAX_ALLOC_SIZE - MI_PADDING_SIZE)) {
#if MI_DEBUG > 0
_mi_error_message(EOVERFLOW, "aligned allocation request is too large (size %zu, alignment %zu)\n", size, alignment);
#endif
return NULL;
}
// use regular allocation if it is guaranteed to fit the alignment constraints.
// this is important to try as the fast path in `mi_heap_malloc_zero_aligned` only works when there exist
// a page with the right block size, and if we always use the over-alloc fallback that would never happen.
if (offset == 0 && mi_malloc_is_naturally_aligned(size,alignment)) {
void* p = _mi_heap_malloc_zero(heap, size, zero);
void* p = mi_heap_malloc_zero_no_guarded(heap, size, zero);
mi_assert_internal(p == NULL || ((uintptr_t)p % alignment) == 0);
const bool is_aligned_or_null = (((uintptr_t)p) & (alignment-1))==0;
const bool is_aligned_or_null = (((uintptr_t)p) & (alignment-1))==0;
if mi_likely(is_aligned_or_null) {
return p;
}
else {
// this should never happen if the `mi_malloc_is_naturally_aligned` check is correct..
mi_assert(false);
mi_free(p);
mi_free(p);
}
}
@ -122,6 +164,7 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_generic(mi_heap_t*
return mi_heap_malloc_zero_aligned_at_overalloc(heap,size,alignment,offset,zero);
}
// Primitive aligned allocation
static void* mi_heap_malloc_zero_aligned_at(mi_heap_t* const heap, const size_t size, const size_t alignment, const size_t offset, const bool zero) mi_attr_noexcept
{
@ -132,11 +175,17 @@ static void* mi_heap_malloc_zero_aligned_at(mi_heap_t* const heap, const size_t
#endif
return NULL;
}
#if MI_GUARDED
if (offset==0 && alignment < MI_BLOCK_ALIGNMENT_MAX && mi_heap_malloc_use_guarded(heap,size)) {
return mi_heap_malloc_guarded_aligned(heap, size, alignment, zero);
}
#endif
// try first if there happens to be a small block available with just the right alignment
if mi_likely(size <= MI_SMALL_SIZE_MAX && alignment <= size) {
const uintptr_t align_mask = alignment-1; // for any x, `(x & align_mask) == (x % alignment)`
const size_t padsize = size + MI_PADDING_SIZE;
const size_t padsize = size + MI_PADDING_SIZE;
mi_page_t* page = _mi_heap_get_free_small_page(heap, padsize);
if mi_likely(page->free != NULL) {
const bool is_aligned = (((uintptr_t)page->free + offset) & align_mask)==0;
@ -305,3 +354,5 @@ mi_decl_nodiscard void* mi_recalloc_aligned_at(void* p, size_t newcount, size_t
mi_decl_nodiscard void* mi_recalloc_aligned(void* p, size_t newcount, size_t size, size_t alignment) mi_attr_noexcept {
return mi_heap_recalloc_aligned(mi_prim_get_default_heap(), p, newcount, size, alignment);
}

6
src/alloc-override.c
View file

@ -248,7 +248,7 @@ extern "C" {
// Forward Posix/Unix calls as well
void* reallocf(void* p, size_t newsize) MI_FORWARD2(mi_reallocf,p,newsize)
size_t malloc_size(const void* p) MI_FORWARD1(mi_usable_size,p)
#if !defined(__ANDROID__) && !defined(__FreeBSD__)
#if !defined(__ANDROID__) && !defined(__FreeBSD__) && !defined(__DragonFly__)
size_t malloc_usable_size(void *p) MI_FORWARD1(mi_usable_size,p)
#else
size_t malloc_usable_size(const void *p) MI_FORWARD1(mi_usable_size,p)
@ -289,8 +289,8 @@ mi_decl_weak int reallocarr(void* p, size_t count, size_t size) { return mi_r
void __libc_free(void* p) MI_FORWARD0(mi_free, p)
void* __libc_memalign(size_t alignment, size_t size) { return mi_memalign(alignment, size); }
#elif defined(__GLIBC__) && defined(__linux__)
// forward __libc interface (needed for glibc-based Linux distributions)
#elif defined(__linux__)
// forward __libc interface (needed for glibc-based and musl-based Linux distributions)
void* __libc_malloc(size_t size) MI_FORWARD1(mi_malloc,size)
void* __libc_calloc(size_t count, size_t size) MI_FORWARD2(mi_calloc,count,size)
void* __libc_realloc(void* p, size_t size) MI_FORWARD2(mi_realloc,p,size)

110
src/alloc.c
View file

@ -31,17 +31,22 @@ terms of the MIT license. A copy of the license can be found in the file
extern inline void* _mi_page_malloc_zero(mi_heap_t* heap, mi_page_t* page, size_t size, bool zero) mi_attr_noexcept
{
mi_assert_internal(page->block_size == 0 /* empty heap */ || mi_page_block_size(page) >= size);
// check the free list
mi_block_t* const block = page->free;
if mi_unlikely(block == NULL) {
return _mi_malloc_generic(heap, size, zero, 0);
}
mi_assert_internal(block != NULL && _mi_ptr_page(block) == page);
// pop from the free list
page->free = mi_block_next(page, block);
page->used++;
mi_assert_internal(page->free == NULL || _mi_ptr_page(page->free) == page);
mi_assert_internal(page->block_size < MI_MAX_ALIGN_SIZE || _mi_is_aligned(block, MI_MAX_ALIGN_SIZE));
#if MI_DEBUG>3
if (page->free_is_zero) {
if (page->free_is_zero && size > sizeof(*block)) {
mi_assert_expensive(mi_mem_is_zero(block+1,size - sizeof(*block)));
}
#endif
@ -54,7 +59,10 @@ extern inline void* _mi_page_malloc_zero(mi_heap_t* heap, mi_page_t* page, size_
// zero the block? note: we need to zero the full block size (issue #63)
if mi_unlikely(zero) {
mi_assert_internal(page->block_size != 0); // do not call with zero'ing for huge blocks (see _mi_malloc_generic)
mi_assert_internal(!mi_page_is_huge(page));
#if MI_PADDING
mi_assert_internal(page->block_size >= MI_PADDING_SIZE);
#endif
if (page->free_is_zero) {
block->next = 0;
mi_track_mem_defined(block, page->block_size - MI_PADDING_SIZE);
@ -91,7 +99,7 @@ extern inline void* _mi_page_malloc_zero(mi_heap_t* heap, mi_page_t* page, size_
mi_assert_internal(delta >= 0 && mi_page_usable_block_size(page) >= (size - MI_PADDING_SIZE + delta));
#endif
mi_track_mem_defined(padding,sizeof(mi_padding_t)); // note: re-enable since mi_page_usable_block_size may set noaccess
padding->canary = (uint32_t)(mi_ptr_encode(page,block,page->keys));
padding->canary = mi_ptr_encode_canary(page,block,page->keys);
padding->delta = (uint32_t)(delta);
#if MI_PADDING_CHECK
if (!mi_page_is_huge(page)) {
@ -113,17 +121,27 @@ extern void* _mi_page_malloc_zeroed(mi_heap_t* heap, mi_page_t* page, size_t siz
return _mi_page_malloc_zero(heap,page,size,true);
}
#if MI_GUARDED
mi_decl_restrict void* _mi_heap_malloc_guarded(mi_heap_t* heap, size_t size, bool zero) mi_attr_noexcept;
#endif
static inline mi_decl_restrict void* mi_heap_malloc_small_zero(mi_heap_t* heap, size_t size, bool zero) mi_attr_noexcept {
mi_assert(heap != NULL);
mi_assert(size <= MI_SMALL_SIZE_MAX);
#if MI_DEBUG
const uintptr_t tid = _mi_thread_id();
mi_assert(heap->thread_id == 0 || heap->thread_id == tid); // heaps are thread local
#endif
mi_assert(size <= MI_SMALL_SIZE_MAX);
#if (MI_PADDING)
#if (MI_PADDING || MI_GUARDED)
if (size == 0) { size = sizeof(void*); }
#endif
#if MI_GUARDED
if (mi_heap_malloc_use_guarded(heap,size)) {
return _mi_heap_malloc_guarded(heap, size, zero);
}
#endif
// get page in constant time, and allocate from it
mi_page_t* page = _mi_heap_get_free_small_page(heap, size + MI_PADDING_SIZE);
void* const p = _mi_page_malloc_zero(heap, page, size + MI_PADDING_SIZE, zero);
mi_track_malloc(p,size,zero);
@ -153,15 +171,23 @@ mi_decl_nodiscard extern inline mi_decl_restrict void* mi_malloc_small(size_t si
// The main allocation function
extern inline void* _mi_heap_malloc_zero_ex(mi_heap_t* heap, size_t size, bool zero, size_t huge_alignment) mi_attr_noexcept {
// fast path for small objects
if mi_likely(size <= MI_SMALL_SIZE_MAX) {
mi_assert_internal(huge_alignment == 0);
return mi_heap_malloc_small_zero(heap, size, zero);
}
#if MI_GUARDED
else if (huge_alignment==0 && mi_heap_malloc_use_guarded(heap,size)) {
return _mi_heap_malloc_guarded(heap, size, zero);
}
#endif
else {
// regular allocation
mi_assert(heap!=NULL);
mi_assert(heap->thread_id == 0 || heap->thread_id == _mi_thread_id()); // heaps are thread local
void* const p = _mi_malloc_generic(heap, size + MI_PADDING_SIZE, zero, huge_alignment); // note: size can overflow but it is detected in malloc_generic
mi_track_malloc(p,size,zero);
#if MI_STAT>1
if (p != NULL) {
if (!mi_heap_is_initialized(heap)) { heap = mi_prim_get_default_heap(); }
@ -577,6 +603,82 @@ mi_decl_nodiscard void* mi_new_reallocn(void* p, size_t newcount, size_t size) {
}
}
#if MI_GUARDED
// We always allocate a guarded allocation at an offset (`mi_page_has_aligned` will be true).
// We then set the first word of the block to `0` for regular offset aligned allocations (in `alloc-aligned.c`)
// and the first word to `~0` for guarded allocations to have a correct `mi_usable_size`
static void* mi_block_ptr_set_guarded(mi_block_t* block, size_t obj_size) {
// TODO: we can still make padding work by moving it out of the guard page area
mi_page_t* const page = _mi_ptr_page(block);
mi_page_set_has_aligned(page, true);
block->next = MI_BLOCK_TAG_GUARDED;
// set guard page at the end of the block
mi_segment_t* const segment = _mi_page_segment(page);
const size_t block_size = mi_page_block_size(page); // must use `block_size` to match `mi_free_local`
const size_t os_page_size = _mi_os_page_size();
mi_assert_internal(block_size >= obj_size + os_page_size + sizeof(mi_block_t));
if (block_size < obj_size + os_page_size + sizeof(mi_block_t)) {
// should never happen
mi_free(block);
return NULL;
}
uint8_t* guard_page = (uint8_t*)block + block_size - os_page_size;
mi_assert_internal(_mi_is_aligned(guard_page, os_page_size));
if (segment->allow_decommit && _mi_is_aligned(guard_page, os_page_size)) {
_mi_os_protect(guard_page, os_page_size);
}
else {
_mi_warning_message("unable to set a guard page behind an object due to pinned memory (large OS pages?) (object %p of size %zu)\n", block, block_size);
}
// align pointer just in front of the guard page
size_t offset = block_size - os_page_size - obj_size;
mi_assert_internal(offset > sizeof(mi_block_t));
if (offset > MI_BLOCK_ALIGNMENT_MAX) {
// give up to place it right in front of the guard page if the offset is too large for unalignment
offset = MI_BLOCK_ALIGNMENT_MAX;
}
void* p = (uint8_t*)block + offset;
mi_track_align(block, p, offset, obj_size);
mi_track_mem_defined(block, sizeof(mi_block_t));
return p;
}
mi_decl_restrict void* _mi_heap_malloc_guarded(mi_heap_t* heap, size_t size, bool zero) mi_attr_noexcept
{
#if defined(MI_PADDING_SIZE)
mi_assert(MI_PADDING_SIZE==0);
#endif
// allocate multiple of page size ending in a guard page
// ensure minimal alignment requirement?
const size_t os_page_size = _mi_os_page_size();
const size_t obj_size = (mi_option_is_enabled(mi_option_guarded_precise) ? size : _mi_align_up(size, MI_MAX_ALIGN_SIZE));
const size_t bsize = _mi_align_up(_mi_align_up(obj_size, MI_MAX_ALIGN_SIZE) + sizeof(mi_block_t), MI_MAX_ALIGN_SIZE);
const size_t req_size = _mi_align_up(bsize + os_page_size, os_page_size);
mi_block_t* const block = (mi_block_t*)_mi_malloc_generic(heap, req_size, zero, 0 /* huge_alignment */);
if (block==NULL) return NULL;
void* const p = mi_block_ptr_set_guarded(block, obj_size);
// stats
mi_track_malloc(p, size, zero);
if (p != NULL) {
if (!mi_heap_is_initialized(heap)) { heap = mi_prim_get_default_heap(); }
#if MI_STAT>1
mi_heap_stat_increase(heap, malloc, mi_usable_size(p));
#endif
_mi_stat_counter_increase(&heap->tld->stats.guarded_alloc_count, 1);
}
#if MI_DEBUG>3
if (p != NULL && zero) {
mi_assert_expensive(mi_mem_is_zero(p, size));
}
#endif
return p;
}
#endif
// ------------------------------------------------------
// ensure explicit external inline definitions are emitted!
// ------------------------------------------------------

42
src/arena-abandon.c
View file

@ -120,11 +120,7 @@ static void mi_arena_segment_os_mark_abandoned(mi_segment_t* segment) {
mi_assert(segment->memid.memkind != MI_MEM_ARENA);
// not in an arena; we use a list of abandoned segments
mi_subproc_t* const subproc = segment->subproc;
if (!mi_lock_acquire(&subproc->abandoned_os_lock)) {
_mi_error_message(EFAULT, "internal error: failed to acquire the abandoned (os) segment lock to mark abandonment");
// we can continue but cannot visit/reclaim such blocks..
}
else {
mi_lock(&subproc->abandoned_os_lock) {
// push on the tail of the list (important for the visitor)
mi_segment_t* prev = subproc->abandoned_os_list_tail;
mi_assert_internal(prev == NULL || prev->abandoned_os_next == NULL);
@ -138,7 +134,6 @@ static void mi_arena_segment_os_mark_abandoned(mi_segment_t* segment) {
mi_atomic_increment_relaxed(&subproc->abandoned_os_list_count);
mi_atomic_increment_relaxed(&subproc->abandoned_count);
// and release the lock
mi_lock_release(&subproc->abandoned_os_lock);
}
return;
}
@ -148,7 +143,7 @@ static void mi_arena_segment_os_mark_abandoned(mi_segment_t* segment) {
void _mi_arena_segment_mark_abandoned(mi_segment_t* segment)
{
mi_assert_internal(segment->used == segment->abandoned);
mi_atomic_store_release(&segment->thread_id, 0); // mark as abandoned for multi-thread free's
mi_atomic_store_release(&segment->thread_id, (uintptr_t)0); // mark as abandoned for multi-thread free's
if mi_unlikely(segment->memid.memkind != MI_MEM_ARENA) {
mi_arena_segment_os_mark_abandoned(segment);
return;
@ -237,7 +232,7 @@ static mi_segment_t* mi_arena_segment_clear_abandoned_at(mi_arena_t* arena, mi_s
static mi_segment_t* mi_arena_segment_clear_abandoned_next_field(mi_arena_field_cursor_t* previous) {
const size_t max_arena = mi_arena_get_count();
size_t field_idx = mi_bitmap_index_field(previous->bitmap_idx);
size_t bit_idx = mi_bitmap_index_bit_in_field(previous->bitmap_idx) + 1;
size_t bit_idx = mi_bitmap_index_bit_in_field(previous->bitmap_idx);
// visit arena's (from the previous cursor)
for (; previous->start < previous->end; previous->start++, field_idx = 0, bit_idx = 0) {
// index wraps around
@ -251,7 +246,7 @@ static mi_segment_t* mi_arena_segment_clear_abandoned_next_field(mi_arena_field_
if mi_unlikely(field != 0) { // skip zero fields quickly
// we only take the arena lock if there are actually abandoned segments present
if (!has_lock && mi_option_is_enabled(mi_option_visit_abandoned)) {
has_lock = (previous->visit_all ? mi_lock_acquire(&arena->abandoned_visit_lock) : mi_lock_try_acquire(&arena->abandoned_visit_lock));
has_lock = (previous->visit_all ? (mi_lock_acquire(&arena->abandoned_visit_lock),true) : mi_lock_try_acquire(&arena->abandoned_visit_lock));
if (!has_lock) {
if (previous->visit_all) {
_mi_error_message(EFAULT, "internal error: failed to visit all abandoned segments due to failure to acquire the visitor lock");
@ -266,11 +261,12 @@ static mi_segment_t* mi_arena_segment_clear_abandoned_next_field(mi_arena_field_
// pre-check if the bit is set
size_t mask = ((size_t)1 << bit_idx);
if mi_unlikely((field & mask) == mask) {
previous->bitmap_idx = mi_bitmap_index_create(field_idx, bit_idx);
mi_segment_t* const segment = mi_arena_segment_clear_abandoned_at(arena, previous->subproc, previous->bitmap_idx);
mi_bitmap_index_t bitmap_idx = mi_bitmap_index_create(field_idx, bit_idx);
mi_segment_t* const segment = mi_arena_segment_clear_abandoned_at(arena, previous->subproc, bitmap_idx);
if (segment != NULL) {
//mi_assert_internal(arena->blocks_committed == NULL || _mi_bitmap_is_claimed(arena->blocks_committed, arena->field_count, 1, bitmap_idx));
if (has_lock) { mi_lock_release(&arena->abandoned_visit_lock); }
previous->bitmap_idx = mi_bitmap_index_create_ex(field_idx, bit_idx + 1); // start at next one for the next iteration
return segment;
}
}
@ -288,8 +284,8 @@ static mi_segment_t* mi_arena_segment_clear_abandoned_next_list(mi_arena_field_c
// we only allow one thread per sub-process to do to visit guarded by the `abandoned_os_visit_lock`.
// The lock is released when the cursor is released.
if (!previous->hold_visit_lock) {
previous->hold_visit_lock = (previous->visit_all ? mi_lock_acquire(&previous->subproc->abandoned_os_visit_lock)
: mi_lock_try_acquire(&previous->subproc->abandoned_os_visit_lock));
previous->hold_visit_lock = (previous->visit_all ? (mi_lock_acquire(&previous->subproc->abandoned_os_visit_lock),true)
: mi_lock_try_acquire(&previous->subproc->abandoned_os_visit_lock));
if (!previous->hold_visit_lock) {
if (previous->visit_all) {
_mi_error_message(EFAULT, "internal error: failed to visit all abandoned segments due to failure to acquire the OS visitor lock");
@ -300,21 +296,15 @@ static mi_segment_t* mi_arena_segment_clear_abandoned_next_list(mi_arena_field_c
// One list entry at a time
while (previous->os_list_count > 0) {
previous->os_list_count--;
const bool has_lock = mi_lock_acquire(&previous->subproc->abandoned_os_lock); // this could contend with concurrent OS block abandonment and reclaim from `free`
if (has_lock) {
mi_segment_t* segment = previous->subproc->abandoned_os_list;
// pop from head of the list, a subsequent mark will push at the end (and thus we iterate through os_list_count entries)
if (segment == NULL || mi_arena_segment_os_clear_abandoned(segment, false /* we already have the lock */)) {
mi_lock_release(&previous->subproc->abandoned_os_lock);
return segment;
}
// already abandoned, try again
mi_lock_acquire(&previous->subproc->abandoned_os_lock); // this could contend with concurrent OS block abandonment and reclaim from `free`
mi_segment_t* segment = previous->subproc->abandoned_os_list;
// pop from head of the list, a subsequent mark will push at the end (and thus we iterate through os_list_count entries)
if (segment == NULL || mi_arena_segment_os_clear_abandoned(segment, false /* we already have the lock */)) {
mi_lock_release(&previous->subproc->abandoned_os_lock);
return segment;
}
else {
_mi_error_message(EFAULT, "failed to acquire abandoned OS list lock during abandoned block visit\n");
return NULL;
}
// already abandoned, try again
mi_lock_release(&previous->subproc->abandoned_os_lock);
}
// done
mi_assert_internal(previous->os_list_count == 0);

189
src/arena.c
View file

@ -33,7 +33,7 @@ The arena allocation needs to be thread safe and we use an atomic bitmap to allo
typedef struct mi_arena_s {
mi_arena_id_t id; // arena id; 0 for non-specific
mi_memid_t memid; // memid of the memory area
_Atomic(uint8_t*)start; // the start of the memory area
_Atomic(uint8_t*) start; // the start of the memory area
size_t block_count; // size of the area in arena blocks (of `MI_ARENA_BLOCK_SIZE`)
size_t field_count; // number of bitmap fields (where `field_count * MI_BITMAP_FIELD_BITS >= block_count`)
size_t meta_size; // size of the arena structure itself (including its bitmaps)
@ -42,12 +42,13 @@ typedef struct mi_arena_s {
bool exclusive; // only allow allocations if specifically for this arena
bool is_large; // memory area consists of large- or huge OS pages (always committed)
mi_lock_t abandoned_visit_lock; // lock is only used when abandoned segments are being visited
_Atomic(size_t)search_idx; // optimization to start the search for free blocks
_Atomic(mi_msecs_t)purge_expire; // expiration time when blocks should be decommitted from `blocks_decommit`.
mi_bitmap_field_t* blocks_dirty; // are the blocks potentially non-zero?
mi_bitmap_field_t* blocks_committed; // are the blocks committed? (can be NULL for memory that cannot be decommitted)
mi_bitmap_field_t* blocks_purge; // blocks that can be (reset) decommitted. (can be NULL for memory that cannot be (reset) decommitted)
mi_bitmap_field_t* blocks_abandoned; // blocks that start with an abandoned segment. (This crosses API's but it is convenient to have here)
_Atomic(size_t) search_idx; // optimization to start the search for free blocks
_Atomic(mi_msecs_t) purge_expire; // expiration time when blocks should be purged from `blocks_purge`.
mi_bitmap_field_t* blocks_dirty; // are the blocks potentially non-zero?
mi_bitmap_field_t* blocks_committed; // are the blocks committed? (can be NULL for memory that cannot be decommitted)
mi_bitmap_field_t* blocks_purge; // blocks that can be (reset) decommitted. (can be NULL for memory that cannot be (reset) decommitted)
mi_bitmap_field_t* blocks_abandoned; // blocks that start with an abandoned segment. (This crosses API's but it is convenient to have here)
mi_bitmap_field_t blocks_inuse[1]; // in-place bitmap of in-use blocks (of size `field_count`)
// do not add further fields here as the dirty, committed, purged, and abandoned bitmaps follow the inuse bitmap fields.
} mi_arena_t;
@ -60,6 +61,7 @@ typedef struct mi_arena_s {
// The available arenas
static mi_decl_cache_align _Atomic(mi_arena_t*) mi_arenas[MI_MAX_ARENAS];
static mi_decl_cache_align _Atomic(size_t) mi_arena_count; // = 0
static mi_decl_cache_align _Atomic(int64_t) mi_arenas_purge_expire; // set if there exist purgeable arenas
#define MI_IN_ARENA_C
#include "arena-abandon.c"
@ -186,7 +188,7 @@ void* _mi_arena_meta_zalloc(size_t size, mi_memid_t* memid) {
if (p != NULL) return p;
// or fall back to the OS
p = _mi_os_alloc(size, memid, &_mi_stats_main);
p = _mi_os_alloc(size, memid);
if (p == NULL) return NULL;
// zero the OS memory if needed
@ -199,7 +201,7 @@ void* _mi_arena_meta_zalloc(size_t size, mi_memid_t* memid) {
void _mi_arena_meta_free(void* p, mi_memid_t memid, size_t size) {
if (mi_memkind_is_os(memid.memkind)) {
_mi_os_free(p, size, memid, &_mi_stats_main);
_mi_os_free(p, size, memid);
}
else {
mi_assert(memid.memkind == MI_MEM_STATIC);
@ -216,10 +218,10 @@ void* mi_arena_block_start(mi_arena_t* arena, mi_bitmap_index_t bindex) {
----------------------------------------------------------- */
// claim the `blocks_inuse` bits
static bool mi_arena_try_claim(mi_arena_t* arena, size_t blocks, mi_bitmap_index_t* bitmap_idx, mi_stats_t* stats)
static bool mi_arena_try_claim(mi_arena_t* arena, size_t blocks, mi_bitmap_index_t* bitmap_idx)
{
size_t idx = 0; // mi_atomic_load_relaxed(&arena->search_idx); // start from last search; ok to be relaxed as the exact start does not matter
if (_mi_bitmap_try_find_from_claim_across(arena->blocks_inuse, arena->field_count, idx, blocks, bitmap_idx, stats)) {
if (_mi_bitmap_try_find_from_claim_across(arena->blocks_inuse, arena->field_count, idx, blocks, bitmap_idx)) {
mi_atomic_store_relaxed(&arena->search_idx, mi_bitmap_index_field(*bitmap_idx)); // start search from found location next time around
return true;
};
@ -232,13 +234,13 @@ static bool mi_arena_try_claim(mi_arena_t* arena, size_t blocks, mi_bitmap_index
----------------------------------------------------------- */
static mi_decl_noinline void* mi_arena_try_alloc_at(mi_arena_t* arena, size_t arena_index, size_t needed_bcount,
bool commit, mi_memid_t* memid, mi_os_tld_t* tld)
bool commit, mi_memid_t* memid)
{
MI_UNUSED(arena_index);
mi_assert_internal(mi_arena_id_index(arena->id) == arena_index);
mi_bitmap_index_t bitmap_index;
if (!mi_arena_try_claim(arena, needed_bcount, &bitmap_index, tld->stats)) return NULL;
if (!mi_arena_try_claim(arena, needed_bcount, &bitmap_index)) return NULL;
// claimed it!
void* p = mi_arena_block_start(arena, bitmap_index);
@ -268,7 +270,7 @@ static mi_decl_noinline void* mi_arena_try_alloc_at(mi_arena_t* arena, size_t ar
_mi_bitmap_claim_across(arena->blocks_committed, arena->field_count, needed_bcount, bitmap_index, &any_uncommitted);
if (any_uncommitted) {
bool commit_zero = false;
if (!_mi_os_commit(p, mi_arena_block_size(needed_bcount), &commit_zero, tld->stats)) {
if (!_mi_os_commit(p, mi_arena_block_size(needed_bcount), &commit_zero)) {
memid->initially_committed = false;
}
else {
@ -286,10 +288,10 @@ static mi_decl_noinline void* mi_arena_try_alloc_at(mi_arena_t* arena, size_t ar
// allocate in a specific arena
static void* mi_arena_try_alloc_at_id(mi_arena_id_t arena_id, bool match_numa_node, int numa_node, size_t size, size_t alignment,
bool commit, bool allow_large, mi_arena_id_t req_arena_id, mi_memid_t* memid, mi_os_tld_t* tld )
bool commit, bool allow_large, mi_arena_id_t req_arena_id, mi_memid_t* memid )
{
MI_UNUSED_RELEASE(alignment);
mi_assert_internal(alignment <= MI_SEGMENT_ALIGN);
mi_assert(alignment <= MI_SEGMENT_ALIGN);
const size_t bcount = mi_block_count_of_size(size);
const size_t arena_index = mi_arena_id_index(arena_id);
mi_assert_internal(arena_index < mi_atomic_load_relaxed(&mi_arena_count));
@ -307,7 +309,7 @@ static void* mi_arena_try_alloc_at_id(mi_arena_id_t arena_id, bool match_numa_no
}
// try to allocate
void* p = mi_arena_try_alloc_at(arena, arena_index, bcount, commit, memid, tld);
void* p = mi_arena_try_alloc_at(arena, arena_index, bcount, commit, memid);
mi_assert_internal(p == NULL || _mi_is_aligned(p, alignment));
return p;
}
@ -316,7 +318,7 @@ static void* mi_arena_try_alloc_at_id(mi_arena_id_t arena_id, bool match_numa_no
// allocate from an arena with fallback to the OS
static mi_decl_noinline void* mi_arena_try_alloc(int numa_node, size_t size, size_t alignment,
bool commit, bool allow_large,
mi_arena_id_t req_arena_id, mi_memid_t* memid, mi_os_tld_t* tld )
mi_arena_id_t req_arena_id, mi_memid_t* memid )
{
MI_UNUSED(alignment);
mi_assert_internal(alignment <= MI_SEGMENT_ALIGN);
@ -326,21 +328,21 @@ static mi_decl_noinline void* mi_arena_try_alloc(int numa_node, size_t size, siz
if (req_arena_id != _mi_arena_id_none()) {
// try a specific arena if requested
if (mi_arena_id_index(req_arena_id) < max_arena) {
void* p = mi_arena_try_alloc_at_id(req_arena_id, true, numa_node, size, alignment, commit, allow_large, req_arena_id, memid, tld);
void* p = mi_arena_try_alloc_at_id(req_arena_id, true, numa_node, size, alignment, commit, allow_large, req_arena_id, memid);
if (p != NULL) return p;
}
}
else {
// try numa affine allocation
for (size_t i = 0; i < max_arena; i++) {
void* p = mi_arena_try_alloc_at_id(mi_arena_id_create(i), true, numa_node, size, alignment, commit, allow_large, req_arena_id, memid, tld);
void* p = mi_arena_try_alloc_at_id(mi_arena_id_create(i), true, numa_node, size, alignment, commit, allow_large, req_arena_id, memid);
if (p != NULL) return p;
}
// try from another numa node instead..
if (numa_node >= 0) { // if numa_node was < 0 (no specific affinity requested), all arena's have been tried already
for (size_t i = 0; i < max_arena; i++) {
void* p = mi_arena_try_alloc_at_id(mi_arena_id_create(i), false /* only proceed if not numa local */, numa_node, size, alignment, commit, allow_large, req_arena_id, memid, tld);
void* p = mi_arena_try_alloc_at_id(mi_arena_id_create(i), false /* only proceed if not numa local */, numa_node, size, alignment, commit, allow_large, req_arena_id, memid);
if (p != NULL) return p;
}
}
@ -349,11 +351,10 @@ static mi_decl_noinline void* mi_arena_try_alloc(int numa_node, size_t size, siz
}
// try to reserve a fresh arena space
static bool mi_arena_reserve(size_t req_size, bool allow_large, mi_arena_id_t req_arena_id, mi_arena_id_t *arena_id)
static bool mi_arena_reserve(size_t req_size, bool allow_large, mi_arena_id_t *arena_id)
{
if (_mi_preloading()) return false; // use OS only while pre loading
if (req_arena_id != _mi_arena_id_none()) return false;
const size_t arena_count = mi_atomic_load_acquire(&mi_arena_count);
if (arena_count > (MI_MAX_ARENAS - 4)) return false;
@ -385,27 +386,28 @@ static bool mi_arena_reserve(size_t req_size, bool allow_large, mi_arena_id_t re
void* _mi_arena_alloc_aligned(size_t size, size_t alignment, size_t align_offset, bool commit, bool allow_large,
mi_arena_id_t req_arena_id, mi_memid_t* memid, mi_os_tld_t* tld)
mi_arena_id_t req_arena_id, mi_memid_t* memid)
{
mi_assert_internal(memid != NULL && tld != NULL);
mi_assert_internal(memid != NULL);
mi_assert_internal(size > 0);
*memid = _mi_memid_none();
const int numa_node = _mi_os_numa_node(tld); // current numa node
const int numa_node = _mi_os_numa_node(); // current numa node
// try to allocate in an arena if the alignment is small enough and the object is not too small (as for heap meta data)
if (!mi_option_is_enabled(mi_option_disallow_arena_alloc) || req_arena_id != _mi_arena_id_none()) { // is arena allocation allowed?
if (size >= MI_ARENA_MIN_OBJ_SIZE && alignment <= MI_SEGMENT_ALIGN && align_offset == 0) {
void* p = mi_arena_try_alloc(numa_node, size, alignment, commit, allow_large, req_arena_id, memid, tld);
if (!mi_option_is_enabled(mi_option_disallow_arena_alloc)) { // is arena allocation allowed?
if (size >= MI_ARENA_MIN_OBJ_SIZE && alignment <= MI_SEGMENT_ALIGN && align_offset == 0)
{
void* p = mi_arena_try_alloc(numa_node, size, alignment, commit, allow_large, req_arena_id, memid);
if (p != NULL) return p;
// otherwise, try to first eagerly reserve a new arena
if (req_arena_id == _mi_arena_id_none()) {
mi_arena_id_t arena_id = 0;
if (mi_arena_reserve(size, allow_large, req_arena_id, &arena_id)) {
if (mi_arena_reserve(size, allow_large, &arena_id)) {
// and try allocate in there
mi_assert_internal(req_arena_id == _mi_arena_id_none());
p = mi_arena_try_alloc_at_id(arena_id, true, numa_node, size, alignment, commit, allow_large, req_arena_id, memid, tld);
p = mi_arena_try_alloc_at_id(arena_id, true, numa_node, size, alignment, commit, allow_large, req_arena_id, memid);
if (p != NULL) return p;
}
}
@ -420,16 +422,16 @@ void* _mi_arena_alloc_aligned(size_t size, size_t alignment, size_t align_offset
// finally, fall back to the OS
if (align_offset > 0) {
return _mi_os_alloc_aligned_at_offset(size, alignment, align_offset, commit, allow_large, memid, tld->stats);
return _mi_os_alloc_aligned_at_offset(size, alignment, align_offset, commit, allow_large, memid);
}
else {
return _mi_os_alloc_aligned(size, alignment, commit, allow_large, memid, tld->stats);
return _mi_os_alloc_aligned(size, alignment, commit, allow_large, memid);
}
}
void* _mi_arena_alloc(size_t size, bool commit, bool allow_large, mi_arena_id_t req_arena_id, mi_memid_t* memid, mi_os_tld_t* tld)
void* _mi_arena_alloc(size_t size, bool commit, bool allow_large, mi_arena_id_t req_arena_id, mi_memid_t* memid)
{
return _mi_arena_alloc_aligned(size, MI_ARENA_BLOCK_SIZE, 0, commit, allow_large, req_arena_id, memid, tld);
return _mi_arena_alloc_aligned(size, MI_ARENA_BLOCK_SIZE, 0, commit, allow_large, req_arena_id, memid);
}
@ -455,7 +457,7 @@ static long mi_arena_purge_delay(void) {
// reset or decommit in an arena and update the committed/decommit bitmaps
// assumes we own the area (i.e. blocks_in_use is claimed by us)
static void mi_arena_purge(mi_arena_t* arena, size_t bitmap_idx, size_t blocks, mi_stats_t* stats) {
static void mi_arena_purge(mi_arena_t* arena, size_t bitmap_idx, size_t blocks) {
mi_assert_internal(arena->blocks_committed != NULL);
mi_assert_internal(arena->blocks_purge != NULL);
mi_assert_internal(!arena->memid.is_pinned);
@ -464,7 +466,7 @@ static void mi_arena_purge(mi_arena_t* arena, size_t bitmap_idx, size_t blocks,
bool needs_recommit;
if (_mi_bitmap_is_claimed_across(arena->blocks_committed, arena->field_count, blocks, bitmap_idx)) {
// all blocks are committed, we can purge freely
needs_recommit = _mi_os_purge(p, size, stats);
needs_recommit = _mi_os_purge(p, size);
}
else {
// some blocks are not committed -- this can happen when a partially committed block is freed
@ -472,8 +474,7 @@ static void mi_arena_purge(mi_arena_t* arena, size_t bitmap_idx, size_t blocks,
// we need to ensure we do not try to reset (as that may be invalid for uncommitted memory),
// and also undo the decommit stats (as it was already adjusted)
mi_assert_internal(mi_option_is_enabled(mi_option_purge_decommits));
needs_recommit = _mi_os_purge_ex(p, size, false /* allow reset? */, stats);
if (needs_recommit) { _mi_stat_increase(&_mi_stats_main.committed, size); }
needs_recommit = _mi_os_purge_ex(p, size, false /* allow reset? */, 0);
}
// clear the purged blocks
@ -486,23 +487,26 @@ static void mi_arena_purge(mi_arena_t* arena, size_t bitmap_idx, size_t blocks,
// Schedule a purge. This is usually delayed to avoid repeated decommit/commit calls.
// Note: assumes we (still) own the area as we may purge immediately
static void mi_arena_schedule_purge(mi_arena_t* arena, size_t bitmap_idx, size_t blocks, mi_stats_t* stats) {
static void mi_arena_schedule_purge(mi_arena_t* arena, size_t bitmap_idx, size_t blocks) {
mi_assert_internal(arena->blocks_purge != NULL);
const long delay = mi_arena_purge_delay();
if (delay < 0) return; // is purging allowed at all?
if (_mi_preloading() || delay == 0) {
// decommit directly
mi_arena_purge(arena, bitmap_idx, blocks, stats);
mi_arena_purge(arena, bitmap_idx, blocks);
}
else {
// schedule decommit
mi_msecs_t expire = mi_atomic_loadi64_relaxed(&arena->purge_expire);
if (expire != 0) {
mi_atomic_addi64_acq_rel(&arena->purge_expire, (mi_msecs_t)(delay/10)); // add smallish extra delay
// schedule purge
const mi_msecs_t expire = _mi_clock_now() + delay;
mi_msecs_t expire0 = 0;
if (mi_atomic_casi64_strong_acq_rel(&arena->purge_expire, &expire0, expire)) {
// expiration was not yet set
// maybe set the global arenas expire as well (if it wasn't set already)
mi_atomic_casi64_strong_acq_rel(&mi_arenas_purge_expire, &expire0, expire);
}
else {
mi_atomic_storei64_release(&arena->purge_expire, _mi_clock_now() + delay);
// already an expiration was set
}
_mi_bitmap_claim_across(arena->blocks_purge, arena->field_count, blocks, bitmap_idx, NULL);
}
@ -511,7 +515,7 @@ static void mi_arena_schedule_purge(mi_arena_t* arena, size_t bitmap_idx, size_t
// purge a range of blocks
// return true if the full range was purged.
// assumes we own the area (i.e. blocks_in_use is claimed by us)
static bool mi_arena_purge_range(mi_arena_t* arena, size_t idx, size_t startidx, size_t bitlen, size_t purge, mi_stats_t* stats) {
static bool mi_arena_purge_range(mi_arena_t* arena, size_t idx, size_t startidx, size_t bitlen, size_t purge) {
const size_t endidx = startidx + bitlen;
size_t bitidx = startidx;
bool all_purged = false;
@ -524,7 +528,7 @@ static bool mi_arena_purge_range(mi_arena_t* arena, size_t idx, size_t startidx,
if (count > 0) {
// found range to be purged
const mi_bitmap_index_t range_idx = mi_bitmap_index_create(idx, bitidx);
mi_arena_purge(arena, range_idx, count, stats);
mi_arena_purge(arena, range_idx, count);
if (count == bitlen) {
all_purged = true;
}
@ -535,16 +539,18 @@ static bool mi_arena_purge_range(mi_arena_t* arena, size_t idx, size_t startidx,
}
// returns true if anything was purged
static bool mi_arena_try_purge(mi_arena_t* arena, mi_msecs_t now, bool force, mi_stats_t* stats)
static bool mi_arena_try_purge(mi_arena_t* arena, mi_msecs_t now, bool force)
{
if (arena->memid.is_pinned || arena->blocks_purge == NULL) return false;
// check pre-conditions
if (arena->memid.is_pinned) return false;
// expired yet?
mi_msecs_t expire = mi_atomic_loadi64_relaxed(&arena->purge_expire);
if (expire == 0) return false;
if (!force && expire > now) return false;
if (!force && (expire == 0 || expire > now)) return false;
// reset expire (if not already set concurrently)
mi_atomic_casi64_strong_acq_rel(&arena->purge_expire, &expire, (mi_msecs_t)0);
// potential purges scheduled, walk through the bitmap
bool any_purged = false;
bool full_purge = true;
@ -571,7 +577,7 @@ static bool mi_arena_try_purge(mi_arena_t* arena, mi_msecs_t now, bool force, mi
if (bitlen > 0) {
// read purge again now that we have the in_use bits
purge = mi_atomic_load_acquire(&arena->blocks_purge[i]);
if (!mi_arena_purge_range(arena, i, bitidx, bitlen, purge, stats)) {
if (!mi_arena_purge_range(arena, i, bitidx, bitlen, purge)) {
full_purge = false;
}
any_purged = true;
@ -591,9 +597,15 @@ static bool mi_arena_try_purge(mi_arena_t* arena, mi_msecs_t now, bool force, mi
return any_purged;
}
static void mi_arenas_try_purge( bool force, bool visit_all, mi_stats_t* stats ) {
static void mi_arenas_try_purge( bool force, bool visit_all )
{
if (_mi_preloading() || mi_arena_purge_delay() <= 0) return; // nothing will be scheduled
// check if any arena needs purging?
const mi_msecs_t now = _mi_clock_now();
mi_msecs_t arenas_expire = mi_atomic_load_acquire(&mi_arenas_purge_expire);
if (!force && (arenas_expire == 0 || arenas_expire < now)) return;
const size_t max_arena = mi_atomic_load_acquire(&mi_arena_count);
if (max_arena == 0) return;
@ -601,17 +613,26 @@ static void mi_arenas_try_purge( bool force, bool visit_all, mi_stats_t* stats )
static mi_atomic_guard_t purge_guard;
mi_atomic_guard(&purge_guard)
{
mi_msecs_t now = _mi_clock_now();
size_t max_purge_count = (visit_all ? max_arena : 1);
// increase global expire: at most one purge per delay cycle
mi_atomic_store_release(&mi_arenas_purge_expire, now + mi_arena_purge_delay());
size_t max_purge_count = (visit_all ? max_arena : 2);
bool all_visited = true;
for (size_t i = 0; i < max_arena; i++) {
mi_arena_t* arena = mi_atomic_load_ptr_acquire(mi_arena_t, &mi_arenas[i]);
if (arena != NULL) {
if (mi_arena_try_purge(arena, now, force, stats)) {
if (max_purge_count <= 1) break;
if (mi_arena_try_purge(arena, now, force)) {
if (max_purge_count <= 1) {
all_visited = false;
break;
}
max_purge_count--;
}
}
}
if (all_visited) {
// all arena's were visited and purged: reset global expire
mi_atomic_store_release(&mi_arenas_purge_expire, 0);
}
}
}
@ -620,8 +641,8 @@ static void mi_arenas_try_purge( bool force, bool visit_all, mi_stats_t* stats )
Arena free
----------------------------------------------------------- */
void _mi_arena_free(void* p, size_t size, size_t committed_size, mi_memid_t memid, mi_stats_t* stats) {
mi_assert_internal(size > 0 && stats != NULL);
void _mi_arena_free(void* p, size_t size, size_t committed_size, mi_memid_t memid) {
mi_assert_internal(size > 0);
mi_assert_internal(committed_size <= size);
if (p==NULL) return;
if (size==0) return;
@ -636,7 +657,7 @@ void _mi_arena_free(void* p, size_t size, size_t committed_size, mi_memid_t memi
// if partially committed, adjust the committed stats (as `_mi_os_free` will increase decommit by the full size)
_mi_stat_decrease(&_mi_stats_main.committed, committed_size);
}
_mi_os_free(p, size, memid, stats);
_mi_os_free(p, size, memid);
}
else if (memid.memkind == MI_MEM_ARENA) {
// allocated in an arena
@ -681,7 +702,7 @@ void _mi_arena_free(void* p, size_t size, size_t committed_size, mi_memid_t memi
// works (as we should never reset decommitted parts).
}
// (delay) purge the entire range
mi_arena_schedule_purge(arena, bitmap_idx, blocks, stats);
mi_arena_schedule_purge(arena, bitmap_idx, blocks);
}
// and make it available to others again
@ -697,7 +718,7 @@ void _mi_arena_free(void* p, size_t size, size_t committed_size, mi_memid_t memi
}
// purge expired decommits
mi_arenas_try_purge(false, false, stats);
mi_arenas_try_purge(false, false);
}
// destroy owned arenas; this is unsafe and should only be done using `mi_option_destroy_on_exit`
@ -711,7 +732,7 @@ static void mi_arenas_unsafe_destroy(void) {
mi_lock_done(&arena->abandoned_visit_lock);
if (arena->start != NULL && mi_memkind_is_os(arena->memid.memkind)) {
mi_atomic_store_ptr_release(mi_arena_t, &mi_arenas[i], NULL);
_mi_os_free(arena->start, mi_arena_size(arena), arena->memid, &_mi_stats_main);
_mi_os_free(arena->start, mi_arena_size(arena), arena->memid);
}
else {
new_max_arena = i;
@ -726,15 +747,15 @@ static void mi_arenas_unsafe_destroy(void) {
}
// Purge the arenas; if `force_purge` is true, amenable parts are purged even if not yet expired
void _mi_arenas_collect(bool force_purge, mi_stats_t* stats) {
mi_arenas_try_purge(force_purge, force_purge /* visit all? */, stats);
void _mi_arenas_collect(bool force_purge) {
mi_arenas_try_purge(force_purge, force_purge /* visit all? */);
}
// destroy owned arenas; this is unsafe and should only be done using `mi_option_destroy_on_exit`
// for dynamic libraries that are unloaded and need to release all their allocated memory.
void _mi_arena_unsafe_destroy_all(mi_stats_t* stats) {
void _mi_arena_unsafe_destroy_all(void) {
mi_arenas_unsafe_destroy();
_mi_arenas_collect(true /* force purge */, stats); // purge non-owned arenas
_mi_arenas_collect(true /* force purge */); // purge non-owned arenas
}
// Is a pointer inside any of our arenas?
@ -838,11 +859,11 @@ int mi_reserve_os_memory_ex(size_t size, bool commit, bool allow_large, bool exc
if (arena_id != NULL) *arena_id = _mi_arena_id_none();
size = _mi_align_up(size, MI_ARENA_BLOCK_SIZE); // at least one block
mi_memid_t memid;
void* start = _mi_os_alloc_aligned(size, MI_SEGMENT_ALIGN, commit, allow_large, &memid, &_mi_stats_main);
void* start = _mi_os_alloc_aligned(size, MI_SEGMENT_ALIGN, commit, allow_large, &memid);
if (start == NULL) return ENOMEM;
const bool is_large = memid.is_pinned; // todo: use separate is_large field?
if (!mi_manage_os_memory_ex2(start, size, is_large, -1 /* numa node */, exclusive, memid, arena_id)) {
_mi_os_free_ex(start, size, commit, memid, &_mi_stats_main);
_mi_os_free_ex(start, size, commit, memid);
_mi_verbose_message("failed to reserve %zu KiB memory\n", _mi_divide_up(size, 1024));
return ENOMEM;
}
@ -890,11 +911,11 @@ static size_t mi_debug_show_bitmap(const char* prefix, const char* header, size_
return inuse_count;
}
void mi_debug_show_arenas(bool show_inuse, bool show_abandoned, bool show_purge) mi_attr_noexcept {
void mi_debug_show_arenas(bool show_inuse) mi_attr_noexcept {
size_t max_arenas = mi_atomic_load_relaxed(&mi_arena_count);
size_t inuse_total = 0;
size_t abandoned_total = 0;
size_t purge_total = 0;
//size_t abandoned_total = 0;
//size_t purge_total = 0;
for (size_t i = 0; i < max_arenas; i++) {
mi_arena_t* arena = mi_atomic_load_ptr_relaxed(mi_arena_t, &mi_arenas[i]);
if (arena == NULL) break;
@ -905,16 +926,16 @@ void mi_debug_show_arenas(bool show_inuse, bool show_abandoned, bool show_purge)
if (arena->blocks_committed != NULL) {
mi_debug_show_bitmap(" ", "committed blocks", arena->block_count, arena->blocks_committed, arena->field_count);
}
if (show_abandoned) {
abandoned_total += mi_debug_show_bitmap(" ", "abandoned blocks", arena->block_count, arena->blocks_abandoned, arena->field_count);
}
if (show_purge && arena->blocks_purge != NULL) {
purge_total += mi_debug_show_bitmap(" ", "purgeable blocks", arena->block_count, arena->blocks_purge, arena->field_count);
}
//if (show_abandoned) {
// abandoned_total += mi_debug_show_bitmap(" ", "abandoned blocks", arena->block_count, arena->blocks_abandoned, arena->field_count);
//}
//if (show_purge && arena->blocks_purge != NULL) {
// purge_total += mi_debug_show_bitmap(" ", "purgeable blocks", arena->block_count, arena->blocks_purge, arena->field_count);
//}
}
if (show_inuse) _mi_verbose_message("total inuse blocks : %zu\n", inuse_total);
if (show_abandoned) _mi_verbose_message("total abandoned blocks: %zu\n", abandoned_total);
if (show_purge) _mi_verbose_message("total purgeable blocks: %zu\n", purge_total);
//if (show_abandoned) _mi_verbose_message("total abandoned blocks: %zu\n", abandoned_total);
//if (show_purge) _mi_verbose_message("total purgeable blocks: %zu\n", purge_total);
}
@ -938,7 +959,7 @@ int mi_reserve_huge_os_pages_at_ex(size_t pages, int numa_node, size_t timeout_m
_mi_verbose_message("numa node %i: reserved %zu GiB huge pages (of the %zu GiB requested)\n", numa_node, pages_reserved, pages);
if (!mi_manage_os_memory_ex2(p, hsize, true, numa_node, exclusive, memid, arena_id)) {
_mi_os_free(p, hsize, memid, &_mi_stats_main);
_mi_os_free(p, hsize, memid);
return ENOMEM;
}
return 0;

12
src/bitmap.c
View file

@ -182,7 +182,7 @@ bool _mi_bitmap_is_any_claimed(mi_bitmap_t bitmap, size_t bitmap_fields, size_t
// Try to atomically claim a sequence of `count` bits starting from the field
// at `idx` in `bitmap` and crossing into subsequent fields. Returns `true` on success.
// Only needs to consider crossing into the next fields (see `mi_bitmap_try_find_from_claim_across`)
static bool mi_bitmap_try_find_claim_field_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t idx, const size_t count, const size_t retries, mi_bitmap_index_t* bitmap_idx, mi_stats_t* stats)
static bool mi_bitmap_try_find_claim_field_across(mi_bitmap_t bitmap, size_t bitmap_fields, size_t idx, const size_t count, const size_t retries, mi_bitmap_index_t* bitmap_idx)
{
mi_assert_internal(bitmap_idx != NULL);
@ -242,7 +242,7 @@ static bool mi_bitmap_try_find_claim_field_across(mi_bitmap_t bitmap, size_t bit
} while (!mi_atomic_cas_strong_acq_rel(field, &map, newmap));
// claimed!
mi_stat_counter_increase(stats->arena_crossover_count,1);
mi_stat_counter_increase(_mi_stats_main.arena_crossover_count,1);
*bitmap_idx = mi_bitmap_index_create(idx, initial_idx);
return true;
@ -262,10 +262,10 @@ rollback:
newmap = (map & ~initial_mask);
} while (!mi_atomic_cas_strong_acq_rel(field, &map, newmap));
}
mi_stat_counter_increase(stats->arena_rollback_count,1);
mi_stat_counter_increase(_mi_stats_main.arena_rollback_count,1);
// retry? (we make a recursive call instead of goto to be able to use const declarations)
if (retries <= 2) {
return mi_bitmap_try_find_claim_field_across(bitmap, bitmap_fields, idx, count, retries+1, bitmap_idx, stats);
return mi_bitmap_try_find_claim_field_across(bitmap, bitmap_fields, idx, count, retries+1, bitmap_idx);
}
else {
return false;
@ -275,7 +275,7 @@ rollback:
// Find `count` bits of zeros and set them to 1 atomically; returns `true` on success.
// Starts at idx, and wraps around to search in all `bitmap_fields` fields.
bool _mi_bitmap_try_find_from_claim_across(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t start_field_idx, const size_t count, mi_bitmap_index_t* bitmap_idx, mi_stats_t* stats) {
bool _mi_bitmap_try_find_from_claim_across(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t start_field_idx, const size_t count, mi_bitmap_index_t* bitmap_idx) {
mi_assert_internal(count > 0);
if (count <= 2) {
// we don't bother with crossover fields for small counts
@ -295,7 +295,7 @@ bool _mi_bitmap_try_find_from_claim_across(mi_bitmap_t bitmap, const size_t bitm
}
*/
// if that fails, then try to claim across fields
if (mi_bitmap_try_find_claim_field_across(bitmap, bitmap_fields, idx, count, 0, bitmap_idx, stats)) {
if (mi_bitmap_try_find_claim_field_across(bitmap, bitmap_fields, idx, count, 0, bitmap_idx)) {
return true;
}
}

8
src/bitmap.h
View file

@ -35,9 +35,13 @@ typedef mi_bitmap_field_t* mi_bitmap_t;
typedef size_t mi_bitmap_index_t;
// Create a bit index.
static inline mi_bitmap_index_t mi_bitmap_index_create_ex(size_t idx, size_t bitidx) {
mi_assert_internal(bitidx <= MI_BITMAP_FIELD_BITS);
return (idx*MI_BITMAP_FIELD_BITS) + bitidx;
}
static inline mi_bitmap_index_t mi_bitmap_index_create(size_t idx, size_t bitidx) {
mi_assert_internal(bitidx < MI_BITMAP_FIELD_BITS);
return (idx*MI_BITMAP_FIELD_BITS) + bitidx;
return mi_bitmap_index_create_ex(idx,bitidx);
}
// Get the field index from a bit index.
@ -90,7 +94,7 @@ bool _mi_bitmap_is_any_claimed(mi_bitmap_t bitmap, size_t bitmap_fields, size_t
// Find `count` bits of zeros and set them to 1 atomically; returns `true` on success.
// Starts at idx, and wraps around to search in all `bitmap_fields` fields.
bool _mi_bitmap_try_find_from_claim_across(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t start_field_idx, const size_t count, mi_bitmap_index_t* bitmap_idx, mi_stats_t* stats);
bool _mi_bitmap_try_find_from_claim_across(mi_bitmap_t bitmap, const size_t bitmap_fields, const size_t start_field_idx, const size_t count, mi_bitmap_index_t* bitmap_idx);
// Set `count` bits at `bitmap_idx` to 0 atomically
// Returns `true` if all `count` bits were 1 previously.

71
src/free.c
View file

@ -34,11 +34,11 @@ static inline void mi_free_block_local(mi_page_t* page, mi_block_t* block, bool
if mi_unlikely(mi_check_is_double_free(page, block)) return;
mi_check_padding(page, block);
if (track_stats) { mi_stat_free(page, block); }
#if (MI_DEBUG>0) && !MI_TRACK_ENABLED && !MI_TSAN
#if (MI_DEBUG>0) && !MI_TRACK_ENABLED && !MI_TSAN && !MI_GUARDED
memset(block, MI_DEBUG_FREED, mi_page_block_size(page));
#endif
if (track_stats) { mi_track_free_size(block, mi_page_usable_size_of(page, block)); } // faster then mi_usable_size as we already know the page and that p is unaligned
// actual free: push on the local free list
mi_block_set_next(page, block, page->local_free);
page->local_free = block;
@ -51,8 +51,8 @@ static inline void mi_free_block_local(mi_page_t* page, mi_block_t* block, bool
}
// Adjust a block that was allocated aligned, to the actual start of the block in the page.
// note: this can be called from `mi_free_generic_mt` where a non-owning thread accesses the
// `page_start` and `block_size` fields; however these are constant and the page won't be
// note: this can be called from `mi_free_generic_mt` where a non-owning thread accesses the
// `page_start` and `block_size` fields; however these are constant and the page won't be
// deallocated (as the block we are freeing keeps it alive) and thus safe to read concurrently.
mi_block_t* _mi_page_ptr_unalign(const mi_page_t* page, const void* p) {
mi_assert_internal(page!=NULL && p!=NULL);
@ -69,16 +69,30 @@ mi_block_t* _mi_page_ptr_unalign(const mi_page_t* page, const void* p) {
return (mi_block_t*)((uintptr_t)p - adjust);
}
// forward declaration for a MI_GUARDED build
#if MI_GUARDED
static void mi_block_unguard(mi_page_t* page, mi_block_t* block, void* p); // forward declaration
static inline void mi_block_check_unguard(mi_page_t* page, mi_block_t* block, void* p) {
if (mi_block_ptr_is_guarded(block, p)) { mi_block_unguard(page, block, p); }
}
#else
static inline void mi_block_check_unguard(mi_page_t* page, mi_block_t* block, void* p) {
MI_UNUSED(page); MI_UNUSED(block); MI_UNUSED(p);
}
#endif
// free a local pointer (page parameter comes first for better codegen)
static void mi_decl_noinline mi_free_generic_local(mi_page_t* page, mi_segment_t* segment, void* p) mi_attr_noexcept {
MI_UNUSED(segment);
mi_block_t* const block = (mi_page_has_aligned(page) ? _mi_page_ptr_unalign(page, p) : (mi_block_t*)p);
mi_block_check_unguard(page, block, p);
mi_free_block_local(page, block, true /* track stats */, true /* check for a full page */);
}
// free a pointer owned by another thread (page parameter comes first for better codegen)
static void mi_decl_noinline mi_free_generic_mt(mi_page_t* page, mi_segment_t* segment, void* p) mi_attr_noexcept {
mi_block_t* const block = _mi_page_ptr_unalign(page, p); // don't check `has_aligned` flag to avoid a race (issue #865)
mi_block_check_unguard(page, block, p);
mi_free_block_mt(page, segment, block);
}
@ -95,17 +109,17 @@ static inline mi_segment_t* mi_checked_ptr_segment(const void* p, const char* ms
{
MI_UNUSED(msg);
#if (MI_DEBUG>0)
if mi_unlikely(((uintptr_t)p & (MI_INTPTR_SIZE - 1)) != 0) {
#if (MI_DEBUG>0)
if mi_unlikely(((uintptr_t)p & (MI_INTPTR_SIZE - 1)) != 0 && !mi_option_is_enabled(mi_option_guarded_precise)) {
_mi_error_message(EINVAL, "%s: invalid (unaligned) pointer: %p\n", msg, p);
return NULL;
}
#endif
#endif
mi_segment_t* const segment = _mi_ptr_segment(p);
if mi_unlikely(segment==NULL) return segment;
#if (MI_DEBUG>0)
#if (MI_DEBUG>0)
if mi_unlikely(!mi_is_in_heap_region(p)) {
_mi_warning_message("%s: pointer might not point to a valid heap region: %p\n"
"(this may still be a valid very large allocation (over 64MiB))\n", msg, p);
@ -113,13 +127,13 @@ static inline mi_segment_t* mi_checked_ptr_segment(const void* p, const char* ms
_mi_warning_message("(yes, the previous pointer %p was valid after all)\n", p);
}
}
#endif
#if (MI_DEBUG>0 || MI_SECURE>=4)
#endif
#if (MI_DEBUG>0 || MI_SECURE>=4)
if mi_unlikely(_mi_ptr_cookie(segment) != segment->cookie) {
_mi_error_message(EINVAL, "%s: pointer does not point to a valid heap space: %p\n", msg, p);
return NULL;
}
#endif
#endif
return segment;
}
@ -231,11 +245,12 @@ static void mi_decl_noinline mi_free_block_delayed_mt( mi_page_t* page, mi_block
static void mi_decl_noinline mi_free_block_mt(mi_page_t* page, mi_segment_t* segment, mi_block_t* block)
{
// first see if the segment was abandoned and if we can reclaim it into our thread
if (mi_option_is_enabled(mi_option_abandoned_reclaim_on_free) &&
if (_mi_option_get_fast(mi_option_abandoned_reclaim_on_free) != 0 &&
#if MI_HUGE_PAGE_ABANDON
segment->page_kind != MI_PAGE_HUGE &&
#endif
mi_atomic_load_relaxed(&segment->thread_id) == 0)
mi_atomic_load_relaxed(&segment->thread_id) == 0 && // segment is abandoned?
mi_prim_get_default_heap() != (mi_heap_t*)&_mi_heap_empty) // and we did not already exit this thread (without this check, a fresh heap will be initalized (issue #944))
{
// the segment is abandoned, try to reclaim it into our heap
if (_mi_segment_attempt_reclaim(mi_heap_get_default(), segment)) {
@ -291,7 +306,13 @@ static size_t mi_decl_noinline mi_page_usable_aligned_size_of(const mi_page_t* p
const size_t size = mi_page_usable_size_of(page, block);
const ptrdiff_t adjust = (uint8_t*)p - (uint8_t*)block;
mi_assert_internal(adjust >= 0 && (size_t)adjust <= size);
return (size - adjust);
const size_t aligned_size = (size - adjust);
#if MI_GUARDED
if (mi_block_ptr_is_guarded(block, p)) {
return aligned_size - _mi_os_page_size();
}
#endif
return aligned_size;
}
static inline size_t _mi_usable_size(const void* p, const char* msg) mi_attr_noexcept {
@ -401,7 +422,7 @@ static bool mi_page_decode_padding(const mi_page_t* page, const mi_block_t* bloc
uintptr_t keys[2];
keys[0] = page->keys[0];
keys[1] = page->keys[1];
bool ok = ((uint32_t)mi_ptr_encode(page,block,keys) == canary && *delta <= *bsize);
bool ok = (mi_ptr_encode_canary(page,block,keys) == canary && *delta <= *bsize);
mi_track_mem_noaccess(padding,sizeof(mi_padding_t));
return ok;
}
@ -518,3 +539,23 @@ static void mi_stat_free(const mi_page_t* page, const mi_block_t* block) {
MI_UNUSED(page); MI_UNUSED(block);
}
#endif
// Remove guard page when building with MI_GUARDED
#if MI_GUARDED
static void mi_block_unguard(mi_page_t* page, mi_block_t* block, void* p) {
MI_UNUSED(p);
mi_assert_internal(mi_block_ptr_is_guarded(block, p));
mi_assert_internal(mi_page_has_aligned(page));
mi_assert_internal((uint8_t*)p - (uint8_t*)block >= (ptrdiff_t)sizeof(mi_block_t));
mi_assert_internal(block->next == MI_BLOCK_TAG_GUARDED);
const size_t bsize = mi_page_block_size(page);
const size_t psize = _mi_os_page_size();
mi_assert_internal(bsize > psize);
mi_assert_internal(_mi_page_segment(page)->allow_decommit);
void* gpage = (uint8_t*)block + bsize - psize;
mi_assert_internal(_mi_is_aligned(gpage, psize));
_mi_os_unprotect(gpage, psize);
}
#endif

49
src/heap.c
View file

@ -32,7 +32,7 @@ static bool mi_heap_visit_pages(mi_heap_t* heap, heap_page_visitor_fun* fn, void
#if MI_DEBUG>1
size_t total = heap->page_count;
size_t count = 0;
#endif
#endif
for (size_t i = 0; i <= MI_BIN_FULL; i++) {
mi_page_queue_t* pq = &heap->pages[i];
@ -59,7 +59,7 @@ static bool mi_heap_page_is_valid(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_
MI_UNUSED(pq);
mi_assert_internal(mi_page_heap(page) == heap);
mi_segment_t* segment = _mi_page_segment(page);
mi_assert_internal(segment->thread_id == heap->thread_id);
mi_assert_internal(mi_atomic_load_relaxed(&segment->thread_id) == heap->thread_id);
mi_assert_expensive(_mi_page_is_valid(page));
return true;
}
@ -164,9 +164,9 @@ static void mi_heap_collect_ex(mi_heap_t* heap, mi_collect_t collect)
if (force && is_main_thread && mi_heap_is_backing(heap)) {
_mi_thread_data_collect(); // collect thread data cache
}
// collect arenas (this is program wide so don't force purges on abandonment of threads)
_mi_arenas_collect(collect == MI_FORCE /* force purge? */, &heap->tld->stats);
_mi_arenas_collect(collect == MI_FORCE /* force purge? */);
}
void _mi_heap_collect_abandon(mi_heap_t* heap) {
@ -221,6 +221,7 @@ void _mi_heap_init(mi_heap_t* heap, mi_tld_t* tld, mi_arena_id_t arena_id, bool
heap->cookie = _mi_heap_random_next(heap) | 1;
heap->keys[0] = _mi_heap_random_next(heap);
heap->keys[1] = _mi_heap_random_next(heap);
_mi_heap_guarded_init(heap);
// push on the thread local heaps list
heap->next = heap->tld->heaps;
heap->tld->heaps = heap;
@ -240,7 +241,7 @@ mi_decl_nodiscard mi_heap_t* mi_heap_new_in_arena(mi_arena_id_t arena_id) {
}
mi_decl_nodiscard mi_heap_t* mi_heap_new(void) {
// don't reclaim abandoned memory or otherwise destroy is unsafe
// don't reclaim abandoned memory or otherwise destroy is unsafe
return mi_heap_new_ex(0 /* default heap tag */, true /* no reclaim */, _mi_arena_id_none());
}
@ -369,7 +370,13 @@ void mi_heap_destroy(mi_heap_t* heap) {
mi_assert(heap->no_reclaim);
mi_assert_expensive(mi_heap_is_valid(heap));
if (heap==NULL || !mi_heap_is_initialized(heap)) return;
#if MI_GUARDED
// _mi_warning_message("'mi_heap_destroy' called but MI_GUARDED is enabled -- using `mi_heap_delete` instead (heap at %p)\n", heap);
mi_heap_delete(heap);
return;
#else
if (!heap->no_reclaim) {
_mi_warning_message("'mi_heap_destroy' called but ignored as the heap was not created with 'allow_destroy' (heap at %p)\n", heap);
// don't free in case it may contain reclaimed pages
mi_heap_delete(heap);
}
@ -382,12 +389,14 @@ void mi_heap_destroy(mi_heap_t* heap) {
_mi_heap_destroy_pages(heap);
mi_heap_free(heap);
}
#endif
}
// forcefully destroy all heaps in the current thread
void _mi_heap_unsafe_destroy_all(void) {
mi_heap_t* bheap = mi_heap_get_backing();
mi_heap_t* curr = bheap->tld->heaps;
void _mi_heap_unsafe_destroy_all(mi_heap_t* heap) {
mi_assert_internal(heap != NULL);
if (heap == NULL) return;
mi_heap_t* curr = heap->tld->heaps;
while (curr != NULL) {
mi_heap_t* next = curr->next;
if (curr->no_reclaim) {
@ -438,6 +447,12 @@ static void mi_heap_absorb(mi_heap_t* heap, mi_heap_t* from) {
mi_heap_reset_pages(from);
}
// are two heaps compatible with respect to heap-tag, exclusive arena etc.
static bool mi_heaps_are_compatible(mi_heap_t* heap1, mi_heap_t* heap2) {
return (heap1->tag == heap2->tag && // store same kind of objects
heap1->arena_id == heap2->arena_id); // same arena preference
}
// Safe delete a heap without freeing any still allocated blocks in that heap.
void mi_heap_delete(mi_heap_t* heap)
{
@ -446,9 +461,10 @@ void mi_heap_delete(mi_heap_t* heap)
mi_assert_expensive(mi_heap_is_valid(heap));
if (heap==NULL || !mi_heap_is_initialized(heap)) return;
if (!mi_heap_is_backing(heap)) {
mi_heap_t* bheap = heap->tld->heap_backing;
if (bheap != heap && mi_heaps_are_compatible(bheap,heap)) {
// transfer still used pages to the backing heap
mi_heap_absorb(heap->tld->heap_backing, heap);
mi_heap_absorb(bheap, heap);
}
else {
// the backing heap abandons its pages
@ -536,13 +552,14 @@ void _mi_heap_area_init(mi_heap_area_t* area, mi_page_t* page) {
static void mi_get_fast_divisor(size_t divisor, uint64_t* magic, size_t* shift) {
mi_assert_internal(divisor > 0 && divisor <= UINT32_MAX);
*shift = 64 - mi_clz(divisor - 1);
*magic = ((((uint64_t)1 << 32) * (((uint64_t)1 << *shift) - divisor)) / divisor + 1);
*shift = MI_INTPTR_BITS - mi_clz(divisor - 1);
*magic = ((((uint64_t)1 << 32) * (((uint64_t)1 << *shift) - divisor)) / divisor + 1);
}
static size_t mi_fast_divide(size_t n, uint64_t magic, size_t shift) {
mi_assert_internal(n <= UINT32_MAX);
return ((((uint64_t)n * magic) >> 32) + n) >> shift;
const uint64_t hi = ((uint64_t)n * magic) >> 32;
return (size_t)((hi + n) >> shift);
}
bool _mi_heap_area_visit_blocks(const mi_heap_area_t* area, mi_page_t* page, mi_block_visit_fun* visitor, void* arg) {
@ -581,7 +598,7 @@ bool _mi_heap_area_visit_blocks(const mi_heap_area_t* area, mi_page_t* page, mi_
// create a bitmap of free blocks.
#define MI_MAX_BLOCKS (MI_SMALL_PAGE_SIZE / sizeof(void*))
uintptr_t free_map[MI_MAX_BLOCKS / MI_INTPTR_BITS];
const uintptr_t bmapsize = _mi_divide_up(page->capacity, MI_INTPTR_BITS);
const uintptr_t bmapsize = _mi_divide_up(page->capacity, MI_INTPTR_BITS);
memset(free_map, 0, bmapsize * sizeof(intptr_t));
if (page->capacity % MI_INTPTR_BITS != 0) {
// mark left-over bits at the end as free
@ -591,7 +608,7 @@ bool _mi_heap_area_visit_blocks(const mi_heap_area_t* area, mi_page_t* page, mi_
}
// fast repeated division by the block size
uint64_t magic;
uint64_t magic;
size_t shift;
mi_get_fast_divisor(bsize, &magic, &shift);
@ -665,7 +682,7 @@ static bool mi_heap_visit_areas_page(mi_heap_t* heap, mi_page_queue_t* pq, mi_pa
mi_heap_area_visit_fun* fun = (mi_heap_area_visit_fun*)vfun;
mi_heap_area_ex_t xarea;
xarea.page = page;
_mi_heap_area_init(&xarea.area, page);
_mi_heap_area_init(&xarea.area, page);
return fun(heap, &xarea, arg);
}

194
src/init.c
View file

@ -86,7 +86,8 @@ const mi_page_t _mi_page_empty = {
MI_STAT_COUNT_NULL(), \
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } \
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
{ 0, 0 } \
MI_STAT_COUNT_END_NULL()
// --------------------------------------------------------
@ -111,6 +112,9 @@ mi_decl_cache_align const mi_heap_t _mi_heap_empty = {
NULL, // next
false, // can reclaim
0, // tag
#if MI_GUARDED
0, 0, 0, 0, 1, // count is 1 so we never write to it (see `internal.h:mi_heap_malloc_use_guarded`)
#endif
MI_SMALL_PAGES_EMPTY,
MI_PAGE_QUEUES_EMPTY
};
@ -132,9 +136,8 @@ static mi_decl_cache_align mi_tld_t tld_main = {
&_mi_heap_main, &_mi_heap_main,
{ { NULL, NULL }, {NULL ,NULL}, {NULL ,NULL, 0},
0, 0, 0, 0, 0, &mi_subproc_default,
&tld_main.stats, &tld_main.os
&tld_main.stats
}, // segments
{ 0, &tld_main.stats }, // os
{ MI_STATS_NULL } // stats
};
@ -151,6 +154,9 @@ mi_decl_cache_align mi_heap_t _mi_heap_main = {
NULL, // next heap
false, // can reclaim
0, // tag
#if MI_GUARDED
0, 0, 0, 0, 0,
#endif
MI_SMALL_PAGES_EMPTY,
MI_PAGE_QUEUES_EMPTY
};
@ -159,6 +165,45 @@ bool _mi_process_is_initialized = false; // set to `true` in `mi_process_init`.
mi_stats_t _mi_stats_main = { MI_STATS_NULL };
#if MI_GUARDED
mi_decl_export void mi_heap_guarded_set_sample_rate(mi_heap_t* heap, size_t sample_rate, size_t seed) {
heap->guarded_sample_seed = seed;
if (heap->guarded_sample_seed == 0) {
heap->guarded_sample_seed = _mi_heap_random_next(heap);
}
heap->guarded_sample_rate = sample_rate;
if (heap->guarded_sample_rate >= 1) {
heap->guarded_sample_seed = heap->guarded_sample_seed % heap->guarded_sample_rate;
}
heap->guarded_sample_count = heap->guarded_sample_seed; // count down samples
}
mi_decl_export void mi_heap_guarded_set_size_bound(mi_heap_t* heap, size_t min, size_t max) {
heap->guarded_size_min = min;
heap->guarded_size_max = (min > max ? min : max);
}
void _mi_heap_guarded_init(mi_heap_t* heap) {
mi_heap_guarded_set_sample_rate(heap,
(size_t)mi_option_get_clamp(mi_option_guarded_sample_rate, 0, LONG_MAX),
(size_t)mi_option_get(mi_option_guarded_sample_seed));
mi_heap_guarded_set_size_bound(heap,
(size_t)mi_option_get_clamp(mi_option_guarded_min, 0, LONG_MAX),
(size_t)mi_option_get_clamp(mi_option_guarded_max, 0, LONG_MAX) );
}
#else
mi_decl_export void mi_heap_guarded_set_sample_rate(mi_heap_t* heap, size_t sample_rate, size_t seed) {
MI_UNUSED(heap); MI_UNUSED(sample_rate); MI_UNUSED(seed);
}
mi_decl_export void mi_heap_guarded_set_size_bound(mi_heap_t* heap, size_t min, size_t max) {
MI_UNUSED(heap); MI_UNUSED(min); MI_UNUSED(max);
}
void _mi_heap_guarded_init(mi_heap_t* heap) {
MI_UNUSED(heap);
}
#endif
static void mi_heap_main_init(void) {
if (_mi_heap_main.cookie == 0) {
@ -174,6 +219,7 @@ static void mi_heap_main_init(void) {
_mi_heap_main.keys[1] = _mi_heap_random_next(&_mi_heap_main);
mi_lock_init(&mi_subproc_default.abandoned_os_lock);
mi_lock_init(&mi_subproc_default.abandoned_os_visit_lock);
_mi_heap_guarded_init(&_mi_heap_main);
}
}
@ -211,11 +257,10 @@ void mi_subproc_delete(mi_subproc_id_t subproc_id) {
mi_subproc_t* subproc = _mi_subproc_from_id(subproc_id);
// check if there are no abandoned segments still..
bool safe_to_delete = false;
if (mi_lock_acquire(&subproc->abandoned_os_lock)) {
mi_lock(&subproc->abandoned_os_lock) {
if (subproc->abandoned_os_list == NULL) {
safe_to_delete = true;
}
mi_lock_release(&subproc->abandoned_os_lock);
}
if (!safe_to_delete) return;
// safe to release
@ -273,10 +318,10 @@ static mi_thread_data_t* mi_thread_data_zalloc(void) {
// if that fails, allocate as meta data
if (td == NULL) {
mi_memid_t memid;
td = (mi_thread_data_t*)_mi_os_alloc(sizeof(mi_thread_data_t), &memid, &_mi_stats_main);
td = (mi_thread_data_t*)_mi_os_alloc(sizeof(mi_thread_data_t), &memid);
if (td == NULL) {
// if this fails, try once more. (issue #257)
td = (mi_thread_data_t*)_mi_os_alloc(sizeof(mi_thread_data_t), &memid, &_mi_stats_main);
td = (mi_thread_data_t*)_mi_os_alloc(sizeof(mi_thread_data_t), &memid);
if (td == NULL) {
// really out of memory
_mi_error_message(ENOMEM, "unable to allocate thread local heap metadata (%zu bytes)\n", sizeof(mi_thread_data_t));
@ -306,7 +351,7 @@ static void mi_thread_data_free( mi_thread_data_t* tdfree ) {
}
}
// if that fails, just free it directly
_mi_os_free(tdfree, sizeof(mi_thread_data_t), tdfree->memid, &_mi_stats_main);
_mi_os_free(tdfree, sizeof(mi_thread_data_t), tdfree->memid);
}
void _mi_thread_data_collect(void) {
@ -316,7 +361,7 @@ void _mi_thread_data_collect(void) {
if (td != NULL) {
td = mi_atomic_exchange_ptr_acq_rel(mi_thread_data_t, &td_cache[i], NULL);
if (td != NULL) {
_mi_os_free(td, sizeof(mi_thread_data_t), td->memid, &_mi_stats_main);
_mi_os_free(td, sizeof(mi_thread_data_t), td->memid);
}
}
}
@ -353,8 +398,6 @@ void _mi_tld_init(mi_tld_t* tld, mi_heap_t* bheap) {
tld->heaps = NULL;
tld->segments.subproc = &mi_subproc_default;
tld->segments.stats = &tld->stats;
tld->segments.os = &tld->os;
tld->os.stats = &tld->stats;
}
// Free the thread local default heap (called from `mi_thread_done`)
@ -508,54 +551,15 @@ void _mi_heap_set_default_direct(mi_heap_t* heap) {
// --------------------------------------------------------
// Run functions on process init/done, and thread init/done
// --------------------------------------------------------
static void mi_cdecl mi_process_done(void);
static bool os_preloading = true; // true until this module is initialized
static bool mi_redirected = false; // true if malloc redirects to mi_malloc
// Returns true if this module has not been initialized; Don't use C runtime routines until it returns false.
bool mi_decl_noinline _mi_preloading(void) {
return os_preloading;
}
mi_decl_nodiscard bool mi_is_redirected(void) mi_attr_noexcept {
return mi_redirected;
}
// Communicate with the redirection module on Windows
#if defined(_WIN32) && defined(MI_SHARED_LIB) && !defined(MI_WIN_NOREDIRECT)
#ifdef __cplusplus
extern "C" {
#endif
mi_decl_export void _mi_redirect_entry(DWORD reason) {
// called on redirection; careful as this may be called before DllMain
if (reason == DLL_PROCESS_ATTACH) {
mi_redirected = true;
}
else if (reason == DLL_PROCESS_DETACH) {
mi_redirected = false;
}
else if (reason == DLL_THREAD_DETACH) {
mi_thread_done();
}
}
__declspec(dllimport) bool mi_cdecl mi_allocator_init(const char** message);
__declspec(dllimport) void mi_cdecl mi_allocator_done(void);
#ifdef __cplusplus
}
#endif
#else
static bool mi_allocator_init(const char** message) {
if (message != NULL) *message = NULL;
return true;
}
static void mi_allocator_done(void) {
// nothing to do
}
#endif
// Called once by the process loader
static void mi_process_load(void) {
// Called once by the process loader from `src/prim/prim.c`
void _mi_process_load(void) {
mi_heap_main_init();
#if defined(__APPLE__) || defined(MI_TLS_RECURSE_GUARD)
volatile mi_heap_t* dummy = _mi_heap_default; // access TLS to allocate it before setting tls_initialized to true;
@ -563,17 +567,14 @@ static void mi_process_load(void) {
#endif
os_preloading = false;
mi_assert_internal(_mi_is_main_thread());
#if !(defined(_WIN32) && defined(MI_SHARED_LIB)) // use Dll process detach (see below) instead of atexit (issue #521)
atexit(&mi_process_done);
#endif
_mi_options_init();
mi_process_setup_auto_thread_done();
mi_process_init();
if (mi_redirected) _mi_verbose_message("malloc is redirected.\n");
if (_mi_is_redirected()) _mi_verbose_message("malloc is redirected.\n");
// show message from the redirector (if present)
const char* msg = NULL;
mi_allocator_init(&msg);
_mi_allocator_init(&msg);
if (msg != NULL && (mi_option_is_enabled(mi_option_verbose) || mi_option_is_enabled(mi_option_show_errors))) {
_mi_fputs(NULL,NULL,NULL,msg);
}
@ -585,12 +586,15 @@ static void mi_process_load(void) {
#if defined(_WIN32) && (defined(_M_IX86) || defined(_M_X64))
#include <intrin.h>
mi_decl_cache_align bool _mi_cpu_has_fsrm = false;
mi_decl_cache_align bool _mi_cpu_has_erms = false;
static void mi_detect_cpu_features(void) {
// FSRM for fast rep movsb support (AMD Zen3+ (~2020) or Intel Ice Lake+ (~2017))
// FSRM for fast short rep movsb/stosb support (AMD Zen3+ (~2020) or Intel Ice Lake+ (~2017))
// EMRS for fast enhanced rep movsb/stosb support
int32_t cpu_info[4];
__cpuid(cpu_info, 7);
_mi_cpu_has_fsrm = ((cpu_info[3] & (1 << 4)) != 0); // bit 4 of EDX : see <https://en.wikipedia.org/wiki/CPUID#EAX=7,_ECX=0:_Extended_Features>
_mi_cpu_has_erms = ((cpu_info[2] & (1 << 9)) != 0); // bit 9 of ECX : see <https://en.wikipedia.org/wiki/CPUID#EAX=7,_ECX=0:_Extended_Features>
}
#else
static void mi_detect_cpu_features(void) {
@ -651,7 +655,7 @@ void mi_process_init(void) mi_attr_noexcept {
}
// Called when the process is done (through `at_exit`)
static void mi_cdecl mi_process_done(void) {
void mi_cdecl _mi_process_done(void) {
// only shutdown if we were initialized
if (!_mi_process_is_initialized) return;
// ensure we are called once
@ -659,15 +663,20 @@ static void mi_cdecl mi_process_done(void) {
if (process_done) return;
process_done = true;
// get the default heap so we don't need to acces thread locals anymore
mi_heap_t* heap = mi_prim_get_default_heap(); // use prim to not initialize any heap
mi_assert_internal(heap != NULL);
// release any thread specific resources and ensure _mi_thread_done is called on all but the main thread
_mi_prim_thread_done_auto_done();
#ifndef MI_SKIP_COLLECT_ON_EXIT
#if (MI_DEBUG || !defined(MI_SHARED_LIB))
// free all memory if possible on process exit. This is not needed for a stand-alone process
// but should be done if mimalloc is statically linked into another shared library which
// is repeatedly loaded/unloaded, see issue #281.
mi_collect(true /* force */ );
mi_heap_collect(heap, true /* force */ );
#endif
#endif
@ -675,72 +684,17 @@ static void mi_cdecl mi_process_done(void) {
// since after process_done there might still be other code running that calls `free` (like at_exit routines,
// or C-runtime termination code.
if (mi_option_is_enabled(mi_option_destroy_on_exit)) {
mi_collect(true /* force */);
_mi_heap_unsafe_destroy_all(); // forcefully release all memory held by all heaps (of this thread only!)
_mi_arena_unsafe_destroy_all(& _mi_heap_main_get()->tld->stats);
mi_heap_collect(heap, true /* force */);
_mi_heap_unsafe_destroy_all(heap); // forcefully release all memory held by all heaps (of this thread only!)
_mi_arena_unsafe_destroy_all();
_mi_segment_map_unsafe_destroy();
}
if (mi_option_is_enabled(mi_option_show_stats) || mi_option_is_enabled(mi_option_verbose)) {
mi_stats_print(NULL);
}
mi_allocator_done();
_mi_allocator_done();
_mi_verbose_message("process done: 0x%zx\n", _mi_heap_main.thread_id);
os_preloading = true; // don't call the C runtime anymore
}
#if defined(_WIN32) && defined(MI_SHARED_LIB)
// Windows DLL: easy to hook into process_init and thread_done
__declspec(dllexport) BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved) {
MI_UNUSED(reserved);
MI_UNUSED(inst);
if (reason==DLL_PROCESS_ATTACH) {
mi_process_load();
}
else if (reason==DLL_PROCESS_DETACH) {
mi_process_done();
}
else if (reason==DLL_THREAD_DETACH) {
if (!mi_is_redirected()) {
mi_thread_done();
}
}
return TRUE;
}
#elif defined(_MSC_VER)
// MSVC: use data section magic for static libraries
// See <https://www.codeguru.com/cpp/misc/misc/applicationcontrol/article.php/c6945/Running-Code-Before-and-After-Main.htm>
static int _mi_process_init(void) {
mi_process_load();
return 0;
}
typedef int(*_mi_crt_callback_t)(void);
#if defined(_M_X64) || defined(_M_ARM64)
__pragma(comment(linker, "/include:" "_mi_msvc_initu"))
#pragma section(".CRT$XIU", long, read)
#else
__pragma(comment(linker, "/include:" "__mi_msvc_initu"))
#endif
#pragma data_seg(".CRT$XIU")
mi_decl_externc _mi_crt_callback_t _mi_msvc_initu[] = { &_mi_process_init };
#pragma data_seg()
#elif defined(__cplusplus)
// C++: use static initialization to detect process start
static bool _mi_process_init(void) {
mi_process_load();
return (_mi_heap_main.thread_id != 0);
}
static bool mi_initialized = _mi_process_init();
#elif defined(__GNUC__) || defined(__clang__)
// GCC,Clang: use the constructor attribute
static void __attribute__((constructor)) _mi_process_init(void) {
mi_process_load();
}
#else
#pragma message("define a way to call mi_process_load on your platform")
#endif

20
src/libc.c
View file

@ -130,7 +130,7 @@ static void mi_out_alignright(char fill, char* start, size_t len, size_t extra,
}
static void mi_out_num(uintptr_t x, size_t base, char prefix, char** out, char* end)
static void mi_out_num(uintmax_t x, size_t base, char prefix, char** out, char* end)
{
if (x == 0 || base == 0 || base > 16) {
if (prefix != 0) { mi_outc(prefix, out, end); }
@ -206,12 +206,13 @@ void _mi_vsnprintf(char* buf, size_t bufsize, const char* fmt, va_list args) {
}
else if (c == 'p' || c == 'x' || c == 'u') {
// unsigned
uintptr_t x = 0;
uintmax_t x = 0;
if (c == 'x' || c == 'u') {
if (numtype == 'z') x = va_arg(args, size_t);
else if (numtype == 't') x = va_arg(args, uintptr_t); // unsigned ptrdiff_t
else if (numtype == 'L') x = (uintptr_t)va_arg(args, unsigned long long);
else x = va_arg(args, unsigned long);
else if (numtype == 'L') x = va_arg(args, unsigned long long);
else if (numtype == 'l') x = va_arg(args, unsigned long);
else x = va_arg(args, unsigned int);
}
else if (c == 'p') {
x = va_arg(args, uintptr_t);
@ -228,20 +229,21 @@ void _mi_vsnprintf(char* buf, size_t bufsize, const char* fmt, va_list args) {
}
else if (c == 'i' || c == 'd') {
// signed
intptr_t x = 0;
intmax_t x = 0;
if (numtype == 'z') x = va_arg(args, intptr_t );
else if (numtype == 't') x = va_arg(args, ptrdiff_t);
else if (numtype == 'L') x = (intptr_t)va_arg(args, long long);
else x = va_arg(args, long);
else if (numtype == 'L') x = va_arg(args, long long);
else if (numtype == 'l') x = va_arg(args, long);
else x = va_arg(args, int);
char pre = 0;
if (x < 0) {
pre = '-';
if (x > INTPTR_MIN) { x = -x; }
if (x > INTMAX_MIN) { x = -x; }
}
else if (numplus != 0) {
pre = numplus;
}
mi_out_num((uintptr_t)x, 10, pre, &out, end);
mi_out_num((uintmax_t)x, 10, pre, &out, end);
}
else if (c >= ' ' && c <= '~') {
// unknown format

119
src/options.c
View file

@ -47,6 +47,58 @@ typedef struct mi_option_desc_s {
#define MI_OPTION(opt) mi_option_##opt, #opt, NULL
#define MI_OPTION_LEGACY(opt,legacy) mi_option_##opt, #opt, #legacy
// Some options can be set at build time for statically linked libraries
// (use `-DMI_EXTRA_CPPDEFS="opt1=val1;opt2=val2"`)
//
// This is useful if we cannot pass them as environment variables
// (and setting them programmatically would be too late)
#ifndef MI_DEFAULT_VERBOSE
#define MI_DEFAULT_VERBOSE 0
#endif
#ifndef MI_DEFAULT_EAGER_COMMIT
#define MI_DEFAULT_EAGER_COMMIT 1
#endif
#ifndef MI_DEFAULT_ARENA_EAGER_COMMIT
#define MI_DEFAULT_ARENA_EAGER_COMMIT 2
#endif
// in KiB
#ifndef MI_DEFAULT_ARENA_RESERVE
#if (MI_INTPTR_SIZE>4)
#define MI_DEFAULT_ARENA_RESERVE 1024L*1024L
#else
#define MI_DEFAULT_ARENA_RESERVE 128L*1024L
#endif
#endif
#ifndef MI_DEFAULT_DISALLOW_ARENA_ALLOC
#define MI_DEFAULT_DISALLOW_ARENA_ALLOC 0
#endif
#ifndef MI_DEFAULT_ALLOW_LARGE_OS_PAGES
#define MI_DEFAULT_ALLOW_LARGE_OS_PAGES 0
#endif
#ifndef MI_DEFAULT_RESERVE_HUGE_OS_PAGES
#define MI_DEFAULT_RESERVE_HUGE_OS_PAGES 0
#endif
#ifndef MI_DEFAULT_RESERVE_OS_MEMORY
#define MI_DEFAULT_RESERVE_OS_MEMORY 0
#endif
#ifndef MI_DEFAULT_GUARDED_SAMPLE_RATE
#if MI_GUARDED
#define MI_DEFAULT_GUARDED_SAMPLE_RATE 4000
#else
#define MI_DEFAULT_GUARDED_SAMPLE_RATE 0
#endif
#endif
static mi_option_desc_t options[_mi_option_last] =
{
// stable options
@ -56,16 +108,21 @@ static mi_option_desc_t options[_mi_option_last] =
{ 0, UNINIT, MI_OPTION(show_errors) },
#endif
{ 0, UNINIT, MI_OPTION(show_stats) },
{ 0, UNINIT, MI_OPTION(verbose) },
{ MI_DEFAULT_VERBOSE, UNINIT, MI_OPTION(verbose) },
// the following options are experimental and not all combinations make sense.
{ 1, UNINIT, MI_OPTION(eager_commit) }, // commit per segment directly (4MiB) (but see also `eager_commit_delay`)
{ 2, UNINIT, MI_OPTION_LEGACY(arena_eager_commit,eager_region_commit) }, // eager commit arena's? 2 is used to enable this only on an OS that has overcommit (i.e. linux)
// some of the following options are experimental and not all combinations are allowed.
{ MI_DEFAULT_EAGER_COMMIT,
UNINIT, MI_OPTION(eager_commit) }, // commit per segment directly (4MiB) (but see also `eager_commit_delay`)
{ MI_DEFAULT_ARENA_EAGER_COMMIT,
UNINIT, MI_OPTION_LEGACY(arena_eager_commit,eager_region_commit) }, // eager commit arena's? 2 is used to enable this only on an OS that has overcommit (i.e. linux)
{ 1, UNINIT, MI_OPTION_LEGACY(purge_decommits,reset_decommits) }, // purge decommits memory (instead of reset) (note: on linux this uses MADV_DONTNEED for decommit)
{ 0, UNINIT, MI_OPTION_LEGACY(allow_large_os_pages,large_os_pages) }, // use large OS pages, use only with eager commit to prevent fragmentation of VMA's
{ 0, UNINIT, MI_OPTION(reserve_huge_os_pages) }, // per 1GiB huge pages
{ MI_DEFAULT_ALLOW_LARGE_OS_PAGES,
UNINIT, MI_OPTION_LEGACY(allow_large_os_pages,large_os_pages) }, // use large OS pages, use only with eager commit to prevent fragmentation of VMA's
{ MI_DEFAULT_RESERVE_HUGE_OS_PAGES,
UNINIT, MI_OPTION(reserve_huge_os_pages) }, // per 1GiB huge pages
{-1, UNINIT, MI_OPTION(reserve_huge_os_pages_at) }, // reserve huge pages at node N
{ 0, UNINIT, MI_OPTION(reserve_os_memory) }, // reserve N KiB OS memory in advance (use `option_get_size`)
{ MI_DEFAULT_RESERVE_OS_MEMORY,
UNINIT, MI_OPTION(reserve_os_memory) }, // reserve N KiB OS memory in advance (use `option_get_size`)
{ 0, UNINIT, MI_OPTION(deprecated_segment_cache) }, // cache N segments per thread
{ 0, UNINIT, MI_OPTION(deprecated_page_reset) }, // reset page memory on free
{ 0, UNINIT, MI_OPTION(abandoned_page_purge) }, // purge free page memory when a thread terminates
@ -83,22 +140,24 @@ static mi_option_desc_t options[_mi_option_last] =
{ 32, UNINIT, MI_OPTION(max_warnings) }, // maximum warnings that are output
{ 10, UNINIT, MI_OPTION(max_segment_reclaim)}, // max. percentage of the abandoned segments to be reclaimed per try.
{ 0, UNINIT, MI_OPTION(destroy_on_exit)}, // release all OS memory on process exit; careful with dangling pointer or after-exit frees!
#if (MI_INTPTR_SIZE>4)
{ 1024L*1024L, UNINIT, MI_OPTION(arena_reserve) }, // reserve memory N KiB at a time (=1GiB) (use `option_get_size`)
#else
{ 128L*1024L, UNINIT, MI_OPTION(arena_reserve) }, // =128MiB on 32-bit
#endif
{ MI_DEFAULT_ARENA_RESERVE, UNINIT, MI_OPTION(arena_reserve) }, // reserve memory N KiB at a time (=1GiB) (use `option_get_size`)
{ 10, UNINIT, MI_OPTION(arena_purge_mult) }, // purge delay multiplier for arena's
{ 1, UNINIT, MI_OPTION_LEGACY(purge_extend_delay, decommit_extend_delay) },
{ 1, UNINIT, MI_OPTION(abandoned_reclaim_on_free) },// reclaim an abandoned segment on a free
{ 0, UNINIT, MI_OPTION(disallow_arena_alloc) }, // 1 = do not use arena's for allocation (except if using specific arena id's)
{ MI_DEFAULT_DISALLOW_ARENA_ALLOC, UNINIT, MI_OPTION(disallow_arena_alloc) }, // 1 = do not use arena's for allocation (except if using specific arena id's)
{ 400, UNINIT, MI_OPTION(retry_on_oom) }, // windows only: retry on out-of-memory for N milli seconds (=400), set to 0 to disable retries.
#if defined(MI_VISIT_ABANDONED)
{ 1, INITIALIZED, MI_OPTION(visit_abandoned) }, // allow visiting heap blocks in abandoned segments; requires taking locks during reclaim.
#else
{ 0, UNINIT, MI_OPTION(visit_abandoned) },
#endif
{ 0, UNINIT, MI_OPTION(guarded_min) }, // only used when building with MI_GUARDED: minimal rounded object size for guarded objects
{ MI_GiB, UNINIT, MI_OPTION(guarded_max) }, // only used when building with MI_GUARDED: maximal rounded object size for guarded objects
{ 0, UNINIT, MI_OPTION(guarded_precise) }, // disregard minimal alignment requirement to always place guarded blocks exactly in front of a guard page (=0)
{ MI_DEFAULT_GUARDED_SAMPLE_RATE,
UNINIT, MI_OPTION(guarded_sample_rate)}, // 1 out of N allocations in the min/max range will be guarded (=4000)
{ 0, UNINIT, MI_OPTION(guarded_sample_seed)},
{ 0, UNINIT, MI_OPTION(target_segments_per_thread) }, // abandon segments beyond this point, or 0 to disable.
};
static void mi_option_init(mi_option_desc_t* desc);
@ -108,8 +167,7 @@ static bool mi_option_has_size_in_kib(mi_option_t option) {
}
void _mi_options_init(void) {
// called on process load; should not be called before the CRT is initialized!
// (e.g. do not call this from process_init as that may run before CRT initialization)
// called on process load
mi_add_stderr_output(); // now it safe to use stderr for output
for(int i = 0; i < _mi_option_last; i++ ) {
mi_option_t option = (mi_option_t)i;
@ -122,8 +180,26 @@ void _mi_options_init(void) {
}
mi_max_error_count = mi_option_get(mi_option_max_errors);
mi_max_warning_count = mi_option_get(mi_option_max_warnings);
#if MI_GUARDED
if (mi_option_get(mi_option_guarded_sample_rate) > 0) {
if (mi_option_is_enabled(mi_option_allow_large_os_pages)) {
mi_option_disable(mi_option_allow_large_os_pages);
_mi_warning_message("option 'allow_large_os_pages' is disabled to allow for guarded objects\n");
}
}
_mi_verbose_message("guarded build: %s\n", mi_option_get(mi_option_guarded_sample_rate) != 0 ? "enabled" : "disabled");
#endif
}
long _mi_option_get_fast(mi_option_t option) {
mi_assert(option >= 0 && option < _mi_option_last);
mi_option_desc_t* desc = &options[option];
mi_assert(desc->option == option); // index should match the option
//mi_assert(desc->init != UNINIT);
return desc->value;
}
mi_decl_nodiscard long mi_option_get(mi_option_t option) {
mi_assert(option >= 0 && option < _mi_option_last);
if (option < 0 || option >= _mi_option_last) return 0;
@ -141,7 +217,6 @@ mi_decl_nodiscard long mi_option_get_clamp(mi_option_t option, long min, long ma
}
mi_decl_nodiscard size_t mi_option_get_size(mi_option_t option) {
mi_assert_internal(mi_option_has_size_in_kib(option));
const long x = mi_option_get(option);
size_t size = (x < 0 ? 0 : (size_t)x);
if (mi_option_has_size_in_kib(option)) {
@ -157,6 +232,13 @@ void mi_option_set(mi_option_t option, long value) {
mi_assert(desc->option == option); // index should match the option
desc->value = value;
desc->init = INITIALIZED;
// ensure min/max range; be careful to not recurse.
if (desc->option == mi_option_guarded_min && _mi_option_get_fast(mi_option_guarded_max) < value) {
mi_option_set(mi_option_guarded_max, value);
}
else if (desc->option == mi_option_guarded_max && _mi_option_get_fast(mi_option_guarded_min) > value) {
mi_option_set(mi_option_guarded_min, value);
}
}
void mi_option_set_default(mi_option_t option, long value) {
@ -506,8 +588,7 @@ static void mi_option_init(mi_option_desc_t* desc) {
value = (size > LONG_MAX ? LONG_MAX : (long)size);
}
if (*end == 0) {
desc->value = value;
desc->init = INITIALIZED;
mi_option_set(desc->option, value);
}
else {
// set `init` first to avoid recursion through _mi_warning_message on mimalloc_verbose.

208
src/os.c
View file

@ -9,18 +9,38 @@ terms of the MIT license. A copy of the license can be found in the file
#include "mimalloc/atomic.h"
#include "mimalloc/prim.h"
#define mi_os_stat_increase(stat,amount) _mi_stat_increase(&_mi_stats_main.stat, amount)
#define mi_os_stat_decrease(stat,amount) _mi_stat_decrease(&_mi_stats_main.stat, amount)
#define mi_os_stat_counter_increase(stat,inc) _mi_stat_counter_increase(&_mi_stats_main.stat, inc)
/* -----------------------------------------------------------
Initialization.
Initialization.
----------------------------------------------------------- */
#ifndef MI_DEFAULT_VIRTUAL_ADDRESS_BITS
#if MI_INTPTR_SIZE < 8
#define MI_DEFAULT_VIRTUAL_ADDRESS_BITS 32
#else
#define MI_DEFAULT_VIRTUAL_ADDRESS_BITS 48
#endif
#endif
#ifndef MI_DEFAULT_PHYSICAL_MEMORY
#if MI_INTPTR_SIZE < 8
#define MI_DEFAULT_PHYSICAL_MEMORY 4*MI_GiB
#else
#define MI_DEFAULT_PHYSICAL_MEMORY 32*MI_GiB
#endif
#endif
static mi_os_mem_config_t mi_os_mem_config = {
4096, // page size
0, // large page size (usually 2MiB)
4096, // allocation granularity
true, // has overcommit? (if true we use MAP_NORESERVE on mmap systems)
false, // can we partially free allocated blocks? (on mmap systems we can free anywhere in a mapped range, but on Windows we must free the entire span)
true // has virtual reserve? (if true we can reserve virtual address space without using commit or physical memory)
4096, // page size
0, // large page size (usually 2MiB)
4096, // allocation granularity
MI_DEFAULT_PHYSICAL_MEMORY,
MI_DEFAULT_VIRTUAL_ADDRESS_BITS,
true, // has overcommit? (if true we use MAP_NORESERVE on mmap systems)
false, // can we partially free allocated blocks? (on mmap systems we can free anywhere in a mapped range, but on Windows we must free the entire span)
true // has virtual reserve? (if true we can reserve virtual address space without using commit or physical memory)
};
bool _mi_os_has_overcommit(void) {
@ -68,8 +88,8 @@ void _mi_os_init(void) {
/* -----------------------------------------------------------
Util
-------------------------------------------------------------- */
bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* stats);
bool _mi_os_commit(void* addr, size_t size, bool* is_zero, mi_stats_t* tld_stats);
bool _mi_os_decommit(void* addr, size_t size);
bool _mi_os_commit(void* addr, size_t size, bool* is_zero);
static inline uintptr_t _mi_align_down(uintptr_t sz, size_t alignment) {
mi_assert_internal(alignment != 0);
@ -91,9 +111,10 @@ static void* mi_align_down_ptr(void* p, size_t alignment) {
aligned hinting
-------------------------------------------------------------- */
// On 64-bit systems, we can do efficient aligned allocation by using
// the 2TiB to 30TiB area to allocate those.
#if (MI_INTPTR_SIZE >= 8)
// On systems with enough virtual address bits, we can do efficient aligned allocation by using
// the 2TiB to 30TiB area to allocate those. If we have at least 46 bits of virtual address
// space (64TiB) we use this technique. (but see issue #939)
#if (MI_INTPTR_SIZE >= 8) && !defined(MI_NO_ALIGNED_HINT)
static mi_decl_cache_align _Atomic(uintptr_t)aligned_base;
// Return a MI_SEGMENT_SIZE aligned address that is probably available.
@ -110,6 +131,7 @@ static mi_decl_cache_align _Atomic(uintptr_t)aligned_base;
void* _mi_os_get_aligned_hint(size_t try_alignment, size_t size)
{
if (try_alignment <= 1 || try_alignment > MI_SEGMENT_SIZE) return NULL;
if (mi_os_mem_config.virtual_address_bits < 46) return NULL; // < 64TiB virtual address space
size = _mi_align_up(size, MI_SEGMENT_SIZE);
if (size > 1*MI_GiB) return NULL; // guarantee the chance of fixed valid address is at most 1/(MI_HINT_AREA / 1<<30) = 1/4096.
#if (MI_SECURE>0)
@ -137,45 +159,50 @@ void* _mi_os_get_aligned_hint(size_t try_alignment, size_t size) {
}
#endif
/* -----------------------------------------------------------
Free memory
-------------------------------------------------------------- */
static void mi_os_free_huge_os_pages(void* p, size_t size, mi_stats_t* stats);
static void mi_os_free_huge_os_pages(void* p, size_t size);
static void mi_os_prim_free(void* addr, size_t size, bool still_committed, mi_stats_t* tld_stats) {
MI_UNUSED(tld_stats);
mi_stats_t* stats = &_mi_stats_main;
static void mi_os_prim_free(void* addr, size_t size, size_t commit_size) {
mi_assert_internal((size % _mi_os_page_size()) == 0);
if (addr == NULL || size == 0) return; // || _mi_os_is_huge_reserved(addr)
int err = _mi_prim_free(addr, size);
if (err != 0) {
_mi_warning_message("unable to free OS memory (error: %d (0x%x), size: 0x%zx bytes, address: %p)\n", err, err, size, addr);
}
if (still_committed) { _mi_stat_decrease(&stats->committed, size); }
_mi_stat_decrease(&stats->reserved, size);
if (commit_size > 0) {
mi_os_stat_decrease(committed, commit_size);
}
mi_os_stat_decrease(reserved, size);
}
void _mi_os_free_ex(void* addr, size_t size, bool still_committed, mi_memid_t memid, mi_stats_t* stats) {
if (stats == NULL) stats = &_mi_stats_main;
void _mi_os_free_ex(void* addr, size_t size, bool still_committed, mi_memid_t memid) {
if (mi_memkind_is_os(memid.memkind)) {
size_t csize = _mi_os_good_alloc_size(size);
size_t csize = memid.mem.os.size;
if (csize==0) { _mi_os_good_alloc_size(size); }
size_t commit_size = (still_committed ? csize : 0);
void* base = addr;
// different base? (due to alignment)
if (memid.mem.os.base != NULL) {
mi_assert(memid.mem.os.base <= addr);
mi_assert((uint8_t*)memid.mem.os.base + memid.mem.os.alignment >= (uint8_t*)addr);
if (memid.mem.os.base != base) {
mi_assert(memid.mem.os.base <= addr);
base = memid.mem.os.base;
csize += ((uint8_t*)addr - (uint8_t*)memid.mem.os.base);
const size_t diff = (uint8_t*)addr - (uint8_t*)memid.mem.os.base;
if (memid.mem.os.size==0) {
csize += diff;
}
if (still_committed) {
commit_size -= diff; // the (addr-base) part was already un-committed
}
}
// free it
if (memid.memkind == MI_MEM_OS_HUGE) {
mi_assert(memid.is_pinned);
mi_os_free_huge_os_pages(base, csize, stats);
mi_os_free_huge_os_pages(base, csize);
}
else {
mi_os_prim_free(base, csize, still_committed, stats);
mi_os_prim_free(base, csize, (still_committed ? commit_size : 0));
}
}
else {
@ -184,9 +211,8 @@ void _mi_os_free_ex(void* addr, size_t size, bool still_committed, mi_memid_t me
}
}
void _mi_os_free(void* p, size_t size, mi_memid_t memid, mi_stats_t* stats) {
if (stats == NULL) stats = &_mi_stats_main;
_mi_os_free_ex(p, size, true, memid, stats);
void _mi_os_free(void* p, size_t size, mi_memid_t memid) {
_mi_os_free_ex(p, size, true, memid);
}
@ -195,7 +221,8 @@ void _mi_os_free(void* p, size_t size, mi_memid_t memid, mi_stats_t* stats) {
-------------------------------------------------------------- */
// Note: the `try_alignment` is just a hint and the returned pointer is not guaranteed to be aligned.
static void* mi_os_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, mi_stats_t* tld_stats) {
// Also `hint_addr` is a hint and may be ignored.
static void* mi_os_prim_alloc_at(void* hint_addr, size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero) {
mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0);
mi_assert_internal(is_zero != NULL);
mi_assert_internal(is_large != NULL);
@ -204,18 +231,18 @@ static void* mi_os_prim_alloc(size_t size, size_t try_alignment, bool commit, bo
if (try_alignment == 0) { try_alignment = 1; } // avoid 0 to ensure there will be no divide by zero when aligning
*is_zero = false;
void* p = NULL;
int err = _mi_prim_alloc(size, try_alignment, commit, allow_large, is_large, is_zero, &p);
int err = _mi_prim_alloc(hint_addr, size, try_alignment, commit, allow_large, is_large, is_zero, &p);
if (err != 0) {
_mi_warning_message("unable to allocate OS memory (error: %d (0x%x), size: 0x%zx bytes, align: 0x%zx, commit: %d, allow large: %d)\n", err, err, size, try_alignment, commit, allow_large);
_mi_warning_message("unable to allocate OS memory (error: %d (0x%x), addr: %p, size: 0x%zx bytes, align: 0x%zx, commit: %d, allow large: %d)\n", err, err, hint_addr, size, try_alignment, commit, allow_large);
}
MI_UNUSED(tld_stats);
mi_stats_t* stats = &_mi_stats_main;
mi_stat_counter_increase(stats->mmap_calls, 1);
mi_os_stat_counter_increase(mmap_calls, 1);
if (p != NULL) {
_mi_stat_increase(&stats->reserved, size);
mi_os_stat_increase(reserved, size);
if (commit) {
_mi_stat_increase(&stats->committed, size);
mi_os_stat_increase(committed, size);
// seems needed for asan (or `mimalloc-test-api` fails)
#ifdef MI_TRACK_ASAN
if (*is_zero) { mi_track_mem_defined(p,size); }
@ -226,10 +253,14 @@ static void* mi_os_prim_alloc(size_t size, size_t try_alignment, bool commit, bo
return p;
}
static void* mi_os_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero) {
return mi_os_prim_alloc_at(NULL, size, try_alignment, commit, allow_large, is_large, is_zero);
}
// Primitive aligned allocation from the OS.
// This function guarantees the allocated memory is aligned.
static void* mi_os_prim_alloc_aligned(size_t size, size_t alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** base, mi_stats_t* stats) {
static void* mi_os_prim_alloc_aligned(size_t size, size_t alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** base) {
mi_assert_internal(alignment >= _mi_os_page_size() && ((alignment & (alignment - 1)) == 0));
mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0);
mi_assert_internal(is_large != NULL);
@ -239,8 +270,8 @@ static void* mi_os_prim_alloc_aligned(size_t size, size_t alignment, bool commit
if (!(alignment >= _mi_os_page_size() && ((alignment & (alignment - 1)) == 0))) return NULL;
size = _mi_align_up(size, _mi_os_page_size());
// try first with a hint (this will be aligned directly on Win 10+ or BSD)
void* p = mi_os_prim_alloc(size, alignment, commit, allow_large, is_large, is_zero, stats);
// try first with a requested alignment hint (this will usually be aligned directly on Win 10+ or BSD)
void* p = mi_os_prim_alloc(size, alignment, commit, allow_large, is_large, is_zero);
if (p == NULL) return NULL;
// aligned already?
@ -249,14 +280,16 @@ static void* mi_os_prim_alloc_aligned(size_t size, size_t alignment, bool commit
}
else {
// if not aligned, free it, overallocate, and unmap around it
#if !MI_TRACK_ASAN
_mi_warning_message("unable to allocate aligned OS memory directly, fall back to over-allocation (size: 0x%zx bytes, address: %p, alignment: 0x%zx, commit: %d)\n", size, p, alignment, commit);
mi_os_prim_free(p, size, commit, stats);
#endif
if (p != NULL) { mi_os_prim_free(p, size, (commit ? size : 0)); }
if (size >= (SIZE_MAX - alignment)) return NULL; // overflow
const size_t over_size = size + alignment;
if (!mi_os_mem_config.has_partial_free) { // win32 virtualAlloc cannot free parts of an allocated block
// over-allocate uncommitted (virtual) memory
p = mi_os_prim_alloc(over_size, 1 /*alignment*/, false /* commit? */, false /* allow_large */, is_large, is_zero, stats);
p = mi_os_prim_alloc(over_size, 1 /*alignment*/, false /* commit? */, false /* allow_large */, is_large, is_zero);
if (p == NULL) return NULL;
// set p to the aligned part in the full region
@ -267,22 +300,22 @@ static void* mi_os_prim_alloc_aligned(size_t size, size_t alignment, bool commit
// explicitly commit only the aligned part
if (commit) {
_mi_os_commit(p, size, NULL, stats);
_mi_os_commit(p, size, NULL);
}
}
else { // mmap can free inside an allocation
// overallocate...
p = mi_os_prim_alloc(over_size, 1, commit, false, is_large, is_zero, stats);
p = mi_os_prim_alloc(over_size, 1, commit, false, is_large, is_zero);
if (p == NULL) return NULL;
// and selectively unmap parts around the over-allocated area.
// and selectively unmap parts around the over-allocated area.
void* aligned_p = mi_align_up_ptr(p, alignment);
size_t pre_size = (uint8_t*)aligned_p - (uint8_t*)p;
size_t mid_size = _mi_align_up(size, _mi_os_page_size());
size_t post_size = over_size - pre_size - mid_size;
mi_assert_internal(pre_size < over_size&& post_size < over_size&& mid_size >= size);
if (pre_size > 0) { mi_os_prim_free(p, pre_size, commit, stats); }
if (post_size > 0) { mi_os_prim_free((uint8_t*)aligned_p + mid_size, post_size, commit, stats); }
if (pre_size > 0) { mi_os_prim_free(p, pre_size, (commit ? pre_size : 0)); }
if (post_size > 0) { mi_os_prim_free((uint8_t*)aligned_p + mid_size, post_size, (commit ? post_size : 0)); }
// we can return the aligned pointer on `mmap` systems
p = aligned_p;
*base = aligned_p; // since we freed the pre part, `*base == p`.
@ -298,37 +331,36 @@ static void* mi_os_prim_alloc_aligned(size_t size, size_t alignment, bool commit
OS API: alloc and alloc_aligned
----------------------------------------------------------- */
void* _mi_os_alloc(size_t size, mi_memid_t* memid, mi_stats_t* stats) {
void* _mi_os_alloc(size_t size, mi_memid_t* memid) {
*memid = _mi_memid_none();
if (size == 0) return NULL;
if (stats == NULL) stats = &_mi_stats_main;
size = _mi_os_good_alloc_size(size);
bool os_is_large = false;
bool os_is_zero = false;
void* p = mi_os_prim_alloc(size, 0, true, false, &os_is_large, &os_is_zero, stats);
void* p = mi_os_prim_alloc(size, 0, true, false, &os_is_large, &os_is_zero);
if (p != NULL) {
*memid = _mi_memid_create_os(true, os_is_zero, os_is_large);
}
return p;
}
void* _mi_os_alloc_aligned(size_t size, size_t alignment, bool commit, bool allow_large, mi_memid_t* memid, mi_stats_t* stats)
void* _mi_os_alloc_aligned(size_t size, size_t alignment, bool commit, bool allow_large, mi_memid_t* memid)
{
MI_UNUSED(&_mi_os_get_aligned_hint); // suppress unused warnings
*memid = _mi_memid_none();
if (size == 0) return NULL;
if (stats == NULL) stats = &_mi_stats_main;
size = _mi_os_good_alloc_size(size);
alignment = _mi_align_up(alignment, _mi_os_page_size());
bool os_is_large = false;
bool os_is_zero = false;
void* os_base = NULL;
void* p = mi_os_prim_alloc_aligned(size, alignment, commit, allow_large, &os_is_large, &os_is_zero, &os_base, stats );
void* p = mi_os_prim_alloc_aligned(size, alignment, commit, allow_large, &os_is_large, &os_is_zero, &os_base );
if (p != NULL) {
*memid = _mi_memid_create_os(commit, os_is_zero, os_is_large);
memid->mem.os.base = os_base;
memid->mem.os.alignment = alignment;
// memid->mem.os.alignment = alignment;
memid->mem.os.size += ((uint8_t*)p - (uint8_t*)os_base); // todo: return from prim_alloc_aligned
}
return p;
}
@ -341,29 +373,28 @@ void* _mi_os_alloc_aligned(size_t size, size_t alignment, bool commit, bool allo
to use the actual start of the memory region.
----------------------------------------------------------- */
void* _mi_os_alloc_aligned_at_offset(size_t size, size_t alignment, size_t offset, bool commit, bool allow_large, mi_memid_t* memid, mi_stats_t* stats) {
void* _mi_os_alloc_aligned_at_offset(size_t size, size_t alignment, size_t offset, bool commit, bool allow_large, mi_memid_t* memid) {
mi_assert(offset <= MI_SEGMENT_SIZE);
mi_assert(offset <= size);
mi_assert((alignment % _mi_os_page_size()) == 0);
*memid = _mi_memid_none();
if (stats == NULL) stats = &_mi_stats_main;
if (offset > MI_SEGMENT_SIZE) return NULL;
if (offset == 0) {
// regular aligned allocation
return _mi_os_alloc_aligned(size, alignment, commit, allow_large, memid, stats);
return _mi_os_alloc_aligned(size, alignment, commit, allow_large, memid);
}
else {
// overallocate to align at an offset
const size_t extra = _mi_align_up(offset, alignment) - offset;
const size_t oversize = size + extra;
void* const start = _mi_os_alloc_aligned(oversize, alignment, commit, allow_large, memid, stats);
void* const start = _mi_os_alloc_aligned(oversize, alignment, commit, allow_large, memid);
if (start == NULL) return NULL;
void* const p = (uint8_t*)start + extra;
mi_assert(_mi_is_aligned((uint8_t*)p + offset, alignment));
// decommit the overallocation at the start
if (commit && extra > _mi_os_page_size()) {
_mi_os_decommit(start, extra, stats);
_mi_os_decommit(start, extra);
}
return p;
}
@ -397,12 +428,10 @@ static void* mi_os_page_align_area_conservative(void* addr, size_t size, size_t*
return mi_os_page_align_areax(true, addr, size, newsize);
}
bool _mi_os_commit(void* addr, size_t size, bool* is_zero, mi_stats_t* tld_stats) {
MI_UNUSED(tld_stats);
mi_stats_t* stats = &_mi_stats_main;
bool _mi_os_commit_ex(void* addr, size_t size, bool* is_zero, size_t stat_size) {
if (is_zero != NULL) { *is_zero = false; }
_mi_stat_increase(&stats->committed, size); // use size for precise commit vs. decommit
_mi_stat_counter_increase(&stats->commit_calls, 1);
mi_os_stat_increase(committed, stat_size); // use size for precise commit vs. decommit
mi_os_stat_counter_increase(commit_calls, 1);
// page align range
size_t csize;
@ -428,11 +457,13 @@ bool _mi_os_commit(void* addr, size_t size, bool* is_zero, mi_stats_t* tld_stats
return true;
}
static bool mi_os_decommit_ex(void* addr, size_t size, bool* needs_recommit, mi_stats_t* tld_stats) {
MI_UNUSED(tld_stats);
mi_stats_t* stats = &_mi_stats_main;
bool _mi_os_commit(void* addr, size_t size, bool* is_zero) {
return _mi_os_commit_ex(addr, size, is_zero, size);
}
static bool mi_os_decommit_ex(void* addr, size_t size, bool* needs_recommit, size_t stat_size) {
mi_assert_internal(needs_recommit!=NULL);
_mi_stat_decrease(&stats->committed, size);
mi_os_stat_decrease(committed, stat_size);
// page align
size_t csize;
@ -449,9 +480,9 @@ static bool mi_os_decommit_ex(void* addr, size_t size, bool* needs_recommit, mi_
return (err == 0);
}
bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* tld_stats) {
bool _mi_os_decommit(void* addr, size_t size) {
bool needs_recommit;
return mi_os_decommit_ex(addr, size, &needs_recommit, tld_stats);
return mi_os_decommit_ex(addr, size, &needs_recommit, size);
}
@ -459,13 +490,13 @@ bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* tld_stats) {
// but may be used later again. This will release physical memory
// pages and reduce swapping while keeping the memory committed.
// We page align to a conservative area inside the range to reset.
bool _mi_os_reset(void* addr, size_t size, mi_stats_t* stats) {
bool _mi_os_reset(void* addr, size_t size) {
// page align conservatively within the range
size_t csize;
void* start = mi_os_page_align_area_conservative(addr, size, &csize);
if (csize == 0) return true; // || _mi_os_is_huge_reserved(addr)
_mi_stat_increase(&stats->reset, csize);
_mi_stat_counter_increase(&stats->reset_calls, 1);
mi_os_stat_increase(reset, csize);
mi_os_stat_counter_increase(reset_calls, 1);
#if (MI_DEBUG>1) && !MI_SECURE && !MI_TRACK_ENABLED // && !MI_TSAN
memset(start, 0, csize); // pretend it is eagerly reset
@ -481,22 +512,22 @@ bool _mi_os_reset(void* addr, size_t size, mi_stats_t* stats) {
// either resets or decommits memory, returns true if the memory needs
// to be recommitted if it is to be re-used later on.
bool _mi_os_purge_ex(void* p, size_t size, bool allow_reset, mi_stats_t* stats)
bool _mi_os_purge_ex(void* p, size_t size, bool allow_reset, size_t stat_size)
{
if (mi_option_get(mi_option_purge_delay) < 0) return false; // is purging allowed?
_mi_stat_counter_increase(&stats->purge_calls, 1);
_mi_stat_increase(&stats->purged, size);
mi_os_stat_counter_increase(purge_calls, 1);
mi_os_stat_increase(purged, size);
if (mi_option_is_enabled(mi_option_purge_decommits) && // should decommit?
!_mi_preloading()) // don't decommit during preloading (unsafe)
{
bool needs_recommit = true;
mi_os_decommit_ex(p, size, &needs_recommit, stats);
mi_os_decommit_ex(p, size, &needs_recommit, stat_size);
return needs_recommit;
}
else {
if (allow_reset) { // this can sometimes be not allowed if the range is not fully committed
_mi_os_reset(p, size, stats);
_mi_os_reset(p, size);
}
return false; // needs no recommit
}
@ -504,8 +535,8 @@ bool _mi_os_purge_ex(void* p, size_t size, bool allow_reset, mi_stats_t* stats)
// either resets or decommits memory, returns true if the memory needs
// to be recommitted if it is to be re-used later on.
bool _mi_os_purge(void* p, size_t size, mi_stats_t * stats) {
return _mi_os_purge_ex(p, size, true, stats);
bool _mi_os_purge(void* p, size_t size) {
return _mi_os_purge_ex(p, size, true, size);
}
@ -613,15 +644,15 @@ void* _mi_os_alloc_huge_os_pages(size_t pages, int numa_node, mi_msecs_t max_mse
// no success, issue a warning and break
if (p != NULL) {
_mi_warning_message("could not allocate contiguous huge OS page %zu at %p\n", page, addr);
mi_os_prim_free(p, MI_HUGE_OS_PAGE_SIZE, true, &_mi_stats_main);
mi_os_prim_free(p, MI_HUGE_OS_PAGE_SIZE, MI_HUGE_OS_PAGE_SIZE);
}
break;
}
// success, record it
page++; // increase before timeout check (see issue #711)
_mi_stat_increase(&_mi_stats_main.committed, MI_HUGE_OS_PAGE_SIZE);
_mi_stat_increase(&_mi_stats_main.reserved, MI_HUGE_OS_PAGE_SIZE);
mi_os_stat_increase(committed, MI_HUGE_OS_PAGE_SIZE);
mi_os_stat_increase(reserved, MI_HUGE_OS_PAGE_SIZE);
// check for timeout
if (max_msecs > 0) {
@ -655,11 +686,11 @@ void* _mi_os_alloc_huge_os_pages(size_t pages, int numa_node, mi_msecs_t max_mse
// free every huge page in a range individually (as we allocated per page)
// note: needed with VirtualAlloc but could potentially be done in one go on mmap'd systems.
static void mi_os_free_huge_os_pages(void* p, size_t size, mi_stats_t* stats) {
static void mi_os_free_huge_os_pages(void* p, size_t size) {
if (p==NULL || size==0) return;
uint8_t* base = (uint8_t*)p;
while (size >= MI_HUGE_OS_PAGE_SIZE) {
mi_os_prim_free(base, MI_HUGE_OS_PAGE_SIZE, true, stats);
mi_os_prim_free(base, MI_HUGE_OS_PAGE_SIZE, MI_HUGE_OS_PAGE_SIZE);
size -= MI_HUGE_OS_PAGE_SIZE;
base += MI_HUGE_OS_PAGE_SIZE;
}
@ -688,8 +719,7 @@ size_t _mi_os_numa_node_count_get(void) {
return count;
}
int _mi_os_numa_node_get(mi_os_tld_t* tld) {
MI_UNUSED(tld);
int _mi_os_numa_node_get(void) {
size_t numa_count = _mi_os_numa_node_count();
if (numa_count<=1) return 0; // optimize on single numa node systems: always node 0
// never more than the node count and >= 0

67
src/page-queue.c
View file

@ -259,8 +259,16 @@ static void mi_page_queue_push(mi_heap_t* heap, mi_page_queue_t* queue, mi_page_
heap->page_count++;
}
static void mi_page_queue_move_to_front(mi_heap_t* heap, mi_page_queue_t* queue, mi_page_t* page) {
mi_assert_internal(mi_page_heap(page) == heap);
mi_assert_internal(mi_page_queue_contains(queue, page));
if (queue->first == page) return;
mi_page_queue_remove(queue, page);
mi_page_queue_push(heap, queue, page);
mi_assert_internal(queue->first == page);
}
static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* from, mi_page_t* page) {
static void mi_page_queue_enqueue_from_ex(mi_page_queue_t* to, mi_page_queue_t* from, bool enqueue_at_end, mi_page_t* page) {
mi_assert_internal(page != NULL);
mi_assert_expensive(mi_page_queue_contains(from, page));
mi_assert_expensive(!mi_page_queue_contains(to, page));
@ -273,6 +281,8 @@ static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* fro
(mi_page_is_huge(page) && mi_page_queue_is_full(to)));
mi_heap_t* heap = mi_page_heap(page);
// delete from `from`
if (page->prev != NULL) page->prev->next = page->next;
if (page->next != NULL) page->next->prev = page->prev;
if (page == from->last) from->last = page->prev;
@ -283,22 +293,59 @@ static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* fro
mi_heap_queue_first_update(heap, from);
}
page->prev = to->last;
page->next = NULL;
if (to->last != NULL) {
mi_assert_internal(heap == mi_page_heap(to->last));
to->last->next = page;
to->last = page;
// insert into `to`
if (enqueue_at_end) {
// enqueue at the end
page->prev = to->last;
page->next = NULL;
if (to->last != NULL) {
mi_assert_internal(heap == mi_page_heap(to->last));
to->last->next = page;
to->last = page;
}
else {
to->first = page;
to->last = page;
mi_heap_queue_first_update(heap, to);
}
}
else {
to->first = page;
to->last = page;
mi_heap_queue_first_update(heap, to);
if (to->first != NULL) {
// enqueue at 2nd place
mi_assert_internal(heap == mi_page_heap(to->first));
mi_page_t* next = to->first->next;
page->prev = to->first;
page->next = next;
to->first->next = page;
if (next != NULL) {
next->prev = page;
}
else {
to->last = page;
}
}
else {
// enqueue at the head (singleton list)
page->prev = NULL;
page->next = NULL;
to->first = page;
to->last = page;
mi_heap_queue_first_update(heap, to);
}
}
mi_page_set_in_full(page, mi_page_queue_is_full(to));
}
static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* from, mi_page_t* page) {
mi_page_queue_enqueue_from_ex(to, from, true /* enqueue at the end */, page);
}
static void mi_page_queue_enqueue_from_full(mi_page_queue_t* to, mi_page_queue_t* from, mi_page_t* page) {
// note: we could insert at the front to increase reuse, but it slows down certain benchmarks (like `alloc-test`)
mi_page_queue_enqueue_from_ex(to, from, true /* enqueue at the end of the `to` queue? */, page);
}
// Only called from `mi_heap_absorb`.
size_t _mi_page_queue_append(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_queue_t* append) {
mi_assert_internal(mi_heap_contains_queue(heap,pq));

112
src/page.c
View file

@ -276,7 +276,7 @@ static mi_page_t* mi_page_fresh_alloc(mi_heap_t* heap, mi_page_queue_t* pq, size
mi_assert_internal(mi_heap_contains_queue(heap, pq));
mi_assert_internal(page_alignment > 0 || block_size > MI_LARGE_OBJ_SIZE_MAX || block_size == pq->block_size);
#endif
mi_page_t* page = _mi_segment_page_alloc(heap, block_size, page_alignment, &heap->tld->segments, &heap->tld->os);
mi_page_t* page = _mi_segment_page_alloc(heap, block_size, page_alignment, &heap->tld->segments);
if (page == NULL) {
// this may be out-of-memory, or an abandoned page was reclaimed (and in our queue)
return NULL;
@ -357,7 +357,7 @@ void _mi_page_unfull(mi_page_t* page) {
mi_page_set_in_full(page, false); // to get the right queue
mi_page_queue_t* pq = mi_heap_page_queue_of(heap, page);
mi_page_set_in_full(page, true);
mi_page_queue_enqueue_from(pq, pqfull, page);
mi_page_queue_enqueue_from_full(pq, pqfull, page);
}
static void mi_page_to_full(mi_page_t* page, mi_page_queue_t* pq) {
@ -403,6 +403,27 @@ void _mi_page_abandon(mi_page_t* page, mi_page_queue_t* pq) {
_mi_segment_page_abandon(page,segments_tld);
}
// force abandon a page
void _mi_page_force_abandon(mi_page_t* page) {
mi_heap_t* heap = mi_page_heap(page);
// mark page as not using delayed free
_mi_page_use_delayed_free(page, MI_NEVER_DELAYED_FREE, false);
// ensure this page is no longer in the heap delayed free list
_mi_heap_delayed_free_all(heap);
// We can still access the page meta-info even if it is freed as we ensure
// in `mi_segment_force_abandon` that the segment is not freed (yet)
if (page->capacity == 0) return; // it may have been freed now
// and now unlink it from the page queue and abandon (or free)
mi_page_queue_t* pq = mi_heap_page_queue_of(heap, page);
if (mi_page_all_free(page)) {
_mi_page_free(page, pq, false);
}
else {
_mi_page_abandon(page, pq);
}
}
// Free a page with no more free blocks
void _mi_page_free(mi_page_t* page, mi_page_queue_t* pq, bool force) {
@ -448,6 +469,7 @@ void _mi_page_retire(mi_page_t* page) mi_attr_noexcept {
// how to check this efficiently though...
// for now, we don't retire if it is the only page left of this size class.
mi_page_queue_t* pq = mi_page_queue_of(page);
#if MI_RETIRE_CYCLES > 0
const size_t bsize = mi_page_block_size(page);
if mi_likely( /* bsize < MI_MAX_RETIRE_SIZE && */ !mi_page_queue_is_special(pq)) { // not full or huge queue?
if (pq->last==page && pq->first==page) { // the only page in the queue?
@ -463,7 +485,7 @@ void _mi_page_retire(mi_page_t* page) mi_attr_noexcept {
return; // don't free after all
}
}
#endif
_mi_page_free(page, pq, false);
}
@ -709,6 +731,17 @@ static void mi_page_init(mi_heap_t* heap, mi_page_t* page, size_t block_size, mi
Find pages with free blocks
-------------------------------------------------------------*/
// search for a best next page to use for at most N pages (often cut short if immediate blocks are available)
#define MI_MAX_CANDIDATE_SEARCH (4)
// is the page not yet used up to its reserved space?
static bool mi_page_is_expandable(const mi_page_t* page) {
mi_assert_internal(page != NULL);
mi_assert_internal(page->capacity <= page->reserved);
return (page->capacity < page->reserved);
}
// Find a page with free blocks of `page->block_size`.
static mi_page_t* mi_page_queue_find_free_ex(mi_heap_t* heap, mi_page_queue_t* pq, bool first_try)
{
@ -716,39 +749,77 @@ static mi_page_t* mi_page_queue_find_free_ex(mi_heap_t* heap, mi_page_queue_t* p
#if MI_STAT
size_t count = 0;
#endif
size_t candidate_count = 0; // we reset this on the first candidate to limit the search
mi_page_t* page_candidate = NULL; // a page with free space
mi_page_t* page = pq->first;
while (page != NULL)
{
mi_page_t* next = page->next; // remember next
#if MI_STAT
count++;
#endif
candidate_count++;
// 0. collect freed blocks by us and other threads
// collect freed blocks by us and other threads
_mi_page_free_collect(page, false);
// 1. if the page contains free blocks, we are done
if (mi_page_immediate_available(page)) {
#if MI_MAX_CANDIDATE_SEARCH > 1
// search up to N pages for a best candidate
// is the local free list non-empty?
const bool immediate_available = mi_page_immediate_available(page);
// if the page is completely full, move it to the `mi_pages_full`
// queue so we don't visit long-lived pages too often.
if (!immediate_available && !mi_page_is_expandable(page)) {
mi_assert_internal(!mi_page_is_in_full(page) && !mi_page_immediate_available(page));
mi_page_to_full(page, pq);
}
else {
// the page has free space, make it a candidate
// we prefer non-expandable pages with high usage as candidates (to reduce commit, and increase chances of free-ing up pages)
if (page_candidate == NULL) {
page_candidate = page;
candidate_count = 0;
}
// prefer to reuse fuller pages (in the hope the less used page gets freed)
else if (page->used >= page_candidate->used && !mi_page_is_mostly_used(page) && !mi_page_is_expandable(page)) {
page_candidate = page;
}
// if we find a non-expandable candidate, or searched for N pages, return with the best candidate
if (immediate_available || candidate_count > MI_MAX_CANDIDATE_SEARCH) {
mi_assert_internal(page_candidate!=NULL);
break;
}
}
#else
// first-fit algorithm
// If the page contains free blocks, we are done
if (mi_page_immediate_available(page) || mi_page_is_expandable(page)) {
break; // pick this one
}
// 2. Try to extend
if (page->capacity < page->reserved) {
mi_page_extend_free(heap, page, heap->tld);
mi_assert_internal(mi_page_immediate_available(page));
break;
}
// 3. If the page is completely full, move it to the `mi_pages_full`
// If the page is completely full, move it to the `mi_pages_full`
// queue so we don't visit long-lived pages too often.
mi_assert_internal(!mi_page_is_in_full(page) && !mi_page_immediate_available(page));
mi_page_to_full(page, pq);
#endif
page = next;
} // for each page
mi_heap_stat_counter_increase(heap, searches, count);
// set the page to the best candidate
if (page_candidate != NULL) {
page = page_candidate;
}
if (page != NULL && !mi_page_immediate_available(page)) {
mi_assert_internal(mi_page_is_expandable(page));
mi_page_extend_free(heap, page, heap->tld);
}
if (page == NULL) {
_mi_heap_collect_retired(heap, false); // perhaps make a page available
page = mi_page_fresh(heap, pq);
@ -758,10 +829,14 @@ static mi_page_t* mi_page_queue_find_free_ex(mi_heap_t* heap, mi_page_queue_t* p
}
}
else {
mi_assert(pq->first == page);
// move the page to the front of the queue
mi_page_queue_move_to_front(heap, pq, page);
page->retire_expire = 0;
// _mi_heap_collect_retired(heap, false); // update retire counts; note: increases rss on MemoryLoad bench so don't do this
}
mi_assert_internal(page == NULL || mi_page_immediate_available(page));
return page;
}
@ -769,7 +844,9 @@ static mi_page_t* mi_page_queue_find_free_ex(mi_heap_t* heap, mi_page_queue_t* p
// Find a page with free blocks of `size`.
static inline mi_page_t* mi_find_free_page(mi_heap_t* heap, size_t size) {
mi_page_queue_t* pq = mi_page_queue(heap,size);
mi_page_queue_t* pq = mi_page_queue(heap, size);
// check the first page: we even do this with candidate search or otherwise we re-search every time
mi_page_t* page = pq->first;
if (page != NULL) {
#if (MI_SECURE>=3) // in secure mode, we extend half the time to increase randomness
@ -788,6 +865,7 @@ static inline mi_page_t* mi_find_free_page(mi_heap_t* heap, size_t size) {
return page; // fast path
}
}
return mi_page_queue_find_free_ex(heap, pq, true);
}
@ -912,7 +990,7 @@ void* _mi_malloc_generic(mi_heap_t* heap, size_t size, bool zero, size_t huge_al
mi_assert_internal(mi_page_block_size(page) >= size);
// and try again, this time succeeding! (i.e. this should never recurse through _mi_page_malloc)
if mi_unlikely(zero && page->block_size == 0) {
if mi_unlikely(zero && mi_page_is_huge(page)) {
// note: we cannot call _mi_page_malloc with zeroing for huge blocks; we zero it afterwards in that case.
void* p = _mi_page_malloc(heap, page, size);
mi_assert_internal(p != NULL);

4
src/prim/emscripten/prim.c
View file

@ -71,8 +71,8 @@ int _mi_prim_free(void* addr, size_t size) {
extern void* emmalloc_memalign(size_t alignment, size_t size);
// Note: the `try_alignment` is just a hint and the returned pointer is not guaranteed to be aligned.
int _mi_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
MI_UNUSED(try_alignment); MI_UNUSED(allow_large); MI_UNUSED(commit);
int _mi_prim_alloc(void* hint_addr, size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
MI_UNUSED(try_alignment); MI_UNUSED(allow_large); MI_UNUSED(commit); MI_UNUSED(hint_addr);
*is_large = false;
// TODO: Track the highest address ever seen; first uses of it are zeroes.
// That assumes no one else uses sbrk but us (they could go up,

4
src/prim/osx/alloc-override-zone.c
View file

@ -418,9 +418,9 @@ static inline malloc_zone_t* mi_get_default_zone(void)
}
#if defined(__clang__)
__attribute__((constructor(0)))
__attribute__((constructor(101))) // highest priority
#else
__attribute__((constructor)) // seems not supported by g++-11 on the M1
__attribute__((constructor)) // priority level is not supported by gcc
#endif
__attribute__((used))
static void _mi_macos_override_malloc(void) {

49
src/prim/prim.c
View file

@ -25,3 +25,52 @@ terms of the MIT license. A copy of the license can be found in the file
#include "unix/prim.c" // mmap() (Linux, macOSX, BSD, Illumnos, Haiku, DragonFly, etc.)
#endif
// Generic process initialization
#ifndef MI_PRIM_HAS_PROCESS_ATTACH
#if defined(__GNUC__) || defined(__clang__)
// gcc,clang: use the constructor/destructor attribute
// which for both seem to run before regular constructors/destructors
#if defined(__clang__)
#define mi_attr_constructor __attribute__((constructor(101)))
#define mi_attr_destructor __attribute__((destructor(101)))
#else
#define mi_attr_constructor __attribute__((constructor))
#define mi_attr_destructor __attribute__((destructor))
#endif
static void mi_attr_constructor mi_process_attach(void) {
_mi_process_load();
}
static void mi_attr_destructor mi_process_detach(void) {
_mi_process_done();
}
#elif defined(__cplusplus)
// C++: use static initialization to detect process start/end
// This is not guaranteed to be first/last but the best we can generally do?
struct mi_init_done_t {
mi_init_done_t() {
_mi_process_load();
}
~mi_init_done_t() {
_mi_process_done();
}
};
static mi_init_done_t mi_init_done;
#else
#pragma message("define a way to call _mi_process_load/done on your platform")
#endif
#endif
// Generic allocator init/done callback
#ifndef MI_PRIM_HAS_ALLOCATOR_INIT
bool _mi_is_redirected(void) {
return false;
}
bool _mi_allocator_init(const char** message) {
if (message != NULL) { *message = NULL; }
return true;
}
void _mi_allocator_done(void) {
// nothing to do
}
#endif

21
src/prim/unix/prim.c
View file

@ -27,6 +27,7 @@ terms of the MIT license. A copy of the license can be found in the file
#include <sys/mman.h> // mmap
#include <unistd.h> // sysconf
#include <fcntl.h> // open, close, read, access
#include <stdlib.h> // getenv, arc4random_buf
#if defined(__linux__)
#include <features.h>
@ -139,6 +140,12 @@ void _mi_prim_mem_init( mi_os_mem_config_t* config )
if (psize > 0) {
config->page_size = (size_t)psize;
config->alloc_granularity = (size_t)psize;
#if defined(_SC_PHYS_PAGES)
long pphys = sysconf(_SC_PHYS_PAGES);
if (pphys > 0 && (size_t)pphys < (SIZE_MAX/(size_t)psize)) {
config->physical_memory = (size_t)pphys * (size_t)psize;
}
#endif
}
config->large_page_size = 2*MI_MiB; // TODO: can we query the OS for this?
config->has_overcommit = unix_detect_overcommit();
@ -181,10 +188,11 @@ int _mi_prim_free(void* addr, size_t size ) {
static int unix_madvise(void* addr, size_t size, int advice) {
#if defined(__sun)
return madvise((caddr_t)addr, size, advice); // Solaris needs cast (issue #520)
int res = madvise((caddr_t)addr, size, advice); // Solaris needs cast (issue #520)
#else
return madvise(addr, size, advice);
int res = madvise(addr, size, advice);
#endif
return (res==0 ? 0 : errno);
}
static void* unix_mmap_prim(void* addr, size_t size, size_t try_alignment, int protect_flags, int flags, int fd) {
@ -331,7 +339,7 @@ static void* unix_mmap(void* addr, size_t size, size_t try_alignment, int protec
// when large OS pages are enabled for mimalloc, we call `madvise` anyways.
if (allow_large && _mi_os_use_large_page(size, try_alignment)) {
if (unix_madvise(p, size, MADV_HUGEPAGE) == 0) {
*is_large = true; // possibly
// *is_large = true; // possibly
};
}
#elif defined(__sun)
@ -340,7 +348,7 @@ static void* unix_mmap(void* addr, size_t size, size_t try_alignment, int protec
cmd.mha_pagesize = _mi_os_large_page_size();
cmd.mha_cmd = MHA_MAPSIZE_VA;
if (memcntl((caddr_t)p, size, MC_HAT_ADVISE, (caddr_t)&cmd, 0, 0) == 0) {
*is_large = true;
// *is_large = true; // possibly
}
}
#endif
@ -350,14 +358,14 @@ static void* unix_mmap(void* addr, size_t size, size_t try_alignment, int protec
}
// Note: the `try_alignment` is just a hint and the returned pointer is not guaranteed to be aligned.
int _mi_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
int _mi_prim_alloc(void* hint_addr, size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0);
mi_assert_internal(commit || !allow_large);
mi_assert_internal(try_alignment > 0);
*is_zero = true;
int protect_flags = (commit ? (PROT_WRITE | PROT_READ) : PROT_NONE);
*addr = unix_mmap(NULL, size, try_alignment, protect_flags, false, allow_large, is_large);
*addr = unix_mmap(hint_addr, size, try_alignment, protect_flags, false, allow_large, is_large);
return (*addr != NULL ? 0 : errno);
}
@ -773,7 +781,6 @@ bool _mi_prim_random_buf(void* buf, size_t buf_len) {
defined(__sun) || \
(defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_7))
#include <stdlib.h>
bool _mi_prim_random_buf(void* buf, size_t buf_len) {
arc4random_buf(buf, buf_len);
return true;

4
src/prim/wasi/prim.c
View file

@ -119,8 +119,8 @@ static void* mi_prim_mem_grow(size_t size, size_t try_alignment) {
}
// Note: the `try_alignment` is just a hint and the returned pointer is not guaranteed to be aligned.
int _mi_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
MI_UNUSED(allow_large); MI_UNUSED(commit);
int _mi_prim_alloc(void* hint_addr, size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
MI_UNUSED(allow_large); MI_UNUSED(commit); MI_UNUSED(hint_addr);
*is_large = false;
*is_zero = false;
*addr = mi_prim_mem_grow(size, try_alignment);

249
src/prim/windows/prim.c
View file

@ -118,6 +118,18 @@ void _mi_prim_mem_init( mi_os_mem_config_t* config )
GetSystemInfo(&si);
if (si.dwPageSize > 0) { config->page_size = si.dwPageSize; }
if (si.dwAllocationGranularity > 0) { config->alloc_granularity = si.dwAllocationGranularity; }
// get virtual address bits
if ((uintptr_t)si.lpMaximumApplicationAddress > 0) {
const size_t vbits = MI_INTPTR_BITS - mi_clz((uintptr_t)si.lpMaximumApplicationAddress);
config->virtual_address_bits = vbits;
}
// get physical memory
ULONGLONG memInKiB = 0;
if (GetPhysicallyInstalledSystemMemory(&memInKiB)) {
if (memInKiB > 0 && memInKiB < (SIZE_MAX / MI_KiB)) {
config->physical_memory = memInKiB * MI_KiB;
}
}
// get the VirtualAlloc2 function
HINSTANCE hDll;
hDll = LoadLibrary(TEXT("kernelbase.dll"));
@ -191,7 +203,7 @@ static void* win_virtual_alloc_prim_once(void* addr, size_t size, size_t try_ali
}
#endif
// on modern Windows try use VirtualAlloc2 for aligned allocation
if (try_alignment > 1 && (try_alignment % _mi_os_page_size()) == 0 && pVirtualAlloc2 != NULL) {
if (addr == NULL && try_alignment > 1 && (try_alignment % _mi_os_page_size()) == 0 && pVirtualAlloc2 != NULL) {
MI_MEM_ADDRESS_REQUIREMENTS reqs = { 0, 0, 0 };
reqs.Alignment = try_alignment;
MI_MEM_EXTENDED_PARAMETER param = { {0, 0}, {0} };
@ -279,14 +291,14 @@ static void* win_virtual_alloc(void* addr, size_t size, size_t try_alignment, DW
return p;
}
int _mi_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
int _mi_prim_alloc(void* hint_addr, size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0);
mi_assert_internal(commit || !allow_large);
mi_assert_internal(try_alignment > 0);
*is_zero = true;
int flags = MEM_RESERVE;
if (commit) { flags |= MEM_COMMIT; }
*addr = win_virtual_alloc(NULL, size, try_alignment, flags, false, allow_large, is_large);
*addr = win_virtual_alloc(hint_addr, size, try_alignment, flags, false, allow_large, is_large);
return (*addr != NULL ? 0 : (int)GetLastError());
}
@ -499,8 +511,7 @@ void _mi_prim_process_info(mi_process_info_t* pinfo)
}
// get process info
PROCESS_MEMORY_COUNTERS info;
memset(&info, 0, sizeof(info));
PROCESS_MEMORY_COUNTERS info; _mi_memzero_var(info);
if (pGetProcessMemoryInfo != NULL) {
pGetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));
}
@ -602,59 +613,205 @@ bool _mi_prim_random_buf(void* buf, size_t buf_len) {
#endif // MI_USE_RTLGENRANDOM
//----------------------------------------------------------------
// Thread init/done
// Process & Thread Init/Done
//----------------------------------------------------------------
#if !defined(MI_SHARED_LIB)
// use thread local storage keys to detect thread ending
// note: another design could be to use special linker sections (see issue #869)
#include <fibersapi.h>
#if (_WIN32_WINNT < 0x600) // before Windows Vista
WINBASEAPI DWORD WINAPI FlsAlloc( _In_opt_ PFLS_CALLBACK_FUNCTION lpCallback );
WINBASEAPI PVOID WINAPI FlsGetValue( _In_ DWORD dwFlsIndex );
WINBASEAPI BOOL WINAPI FlsSetValue( _In_ DWORD dwFlsIndex, _In_opt_ PVOID lpFlsData );
WINBASEAPI BOOL WINAPI FlsFree(_In_ DWORD dwFlsIndex);
#endif
static DWORD mi_fls_key = (DWORD)(-1);
static void NTAPI mi_fls_done(PVOID value) {
mi_heap_t* heap = (mi_heap_t*)value;
if (heap != NULL) {
_mi_thread_done(heap);
FlsSetValue(mi_fls_key, NULL); // prevent recursion as _mi_thread_done may set it back to the main heap, issue #672
static void NTAPI mi_win_main(PVOID module, DWORD reason, LPVOID reserved) {
MI_UNUSED(reserved);
MI_UNUSED(module);
#if MI_TLS_SLOT >= 2
if ((reason==DLL_PROCESS_ATTACH || reason==DLL_THREAD_ATTACH) && mi_prim_get_default_heap() == NULL) {
_mi_heap_set_default_direct((mi_heap_t*)&_mi_heap_empty);
}
#endif
if (reason==DLL_PROCESS_ATTACH) {
_mi_process_load();
}
else if (reason==DLL_PROCESS_DETACH) {
_mi_process_done();
}
else if (reason==DLL_THREAD_DETACH && !_mi_is_redirected()) {
_mi_thread_done(NULL);
}
}
void _mi_prim_thread_init_auto_done(void) {
mi_fls_key = FlsAlloc(&mi_fls_done);
}
void _mi_prim_thread_done_auto_done(void) {
// call thread-done on all threads (except the main thread) to prevent
// dangling callback pointer if statically linked with a DLL; Issue #208
FlsFree(mi_fls_key);
}
#if defined(MI_SHARED_LIB)
#define MI_PRIM_HAS_PROCESS_ATTACH 1
void _mi_prim_thread_associate_default_heap(mi_heap_t* heap) {
mi_assert_internal(mi_fls_key != (DWORD)(-1));
FlsSetValue(mi_fls_key, heap);
}
// Windows DLL: easy to hook into process_init and thread_done
__declspec(dllexport) BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved) {
mi_win_main((PVOID)inst,reason,reserved);
return TRUE;
}
#else
// nothing to do since `_mi_thread_done` is handled through the DLL_THREAD_DETACH event.
void _mi_prim_thread_init_auto_done(void) { }
void _mi_prim_thread_done_auto_done(void) { }
void _mi_prim_thread_associate_default_heap(mi_heap_t* heap) {
MI_UNUSED(heap);
}
// Dll; nothing to do as in that case thread_done is handled through the DLL_THREAD_DETACH event.
#elif !defined(MI_WIN_USE_FLS)
#define MI_PRIM_HAS_PROCESS_ATTACH 1
void _mi_prim_thread_init_auto_done(void) {
}
static void NTAPI mi_win_main_attach(PVOID module, DWORD reason, LPVOID reserved) {
if (reason == DLL_PROCESS_ATTACH || reason == DLL_THREAD_ATTACH) {
mi_win_main(module, reason, reserved);
}
}
static void NTAPI mi_win_main_detach(PVOID module, DWORD reason, LPVOID reserved) {
if (reason == DLL_PROCESS_DETACH || reason == DLL_THREAD_DETACH) {
mi_win_main(module, reason, reserved);
}
}
void _mi_prim_thread_done_auto_done(void) {
}
// Set up TLS callbacks in a statically linked library by using special data sections.
// See <https://stackoverflow.com/questions/14538159/tls-callback-in-windows>
// We use 2 entries to ensure we call attach events before constructors
// are called, and detach events after destructors are called.
#if defined(__cplusplus)
extern "C" {
#endif
void _mi_prim_thread_associate_default_heap(mi_heap_t* heap) {
MI_UNUSED(heap);
}
#if defined(_WIN64)
#pragma comment(linker, "/INCLUDE:_tls_used")
#pragma comment(linker, "/INCLUDE:_mi_tls_callback_pre")
#pragma comment(linker, "/INCLUDE:_mi_tls_callback_post")
#pragma const_seg(".CRT$XLB")
extern const PIMAGE_TLS_CALLBACK _mi_tls_callback_pre[];
const PIMAGE_TLS_CALLBACK _mi_tls_callback_pre[] = { &mi_win_main_attach };
#pragma const_seg()
#pragma const_seg(".CRT$XLY")
extern const PIMAGE_TLS_CALLBACK _mi_tls_callback_post[];
const PIMAGE_TLS_CALLBACK _mi_tls_callback_post[] = { &mi_win_main_detach };
#pragma const_seg()
#else
#pragma comment(linker, "/INCLUDE:__tls_used")
#pragma comment(linker, "/INCLUDE:__mi_tls_callback_pre")
#pragma comment(linker, "/INCLUDE:__mi_tls_callback_post")
#pragma data_seg(".CRT$XLB")
PIMAGE_TLS_CALLBACK _mi_tls_callback_pre[] = { &mi_win_main_attach };
#pragma data_seg()
#pragma data_seg(".CRT$XLY")
PIMAGE_TLS_CALLBACK _mi_tls_callback_post[] = { &mi_win_main_detach };
#pragma data_seg()
#endif
#if defined(__cplusplus)
}
#endif
// nothing to do since `_mi_thread_done` is handled through the DLL_THREAD_DETACH event.
void _mi_prim_thread_init_auto_done(void) { }
void _mi_prim_thread_done_auto_done(void) { }
void _mi_prim_thread_associate_default_heap(mi_heap_t* heap) {
MI_UNUSED(heap);
}
#else // deprecated: statically linked, use fiber api
#if defined(_MSC_VER) // on clang/gcc use the constructor attribute (in `src/prim/prim.c`)
// MSVC: use data section magic for static libraries
// See <https://www.codeguru.com/cpp/misc/misc/applicationcontrol/article.php/c6945/Running-Code-Before-and-After-Main.htm>
#define MI_PRIM_HAS_PROCESS_ATTACH 1
static int mi_process_attach(void) {
mi_win_main(NULL,DLL_PROCESS_ATTACH,NULL);
atexit(&_mi_process_done);
return 0;
}
typedef int(*mi_crt_callback_t)(void);
#if defined(_WIN64)
#pragma comment(linker, "/INCLUDE:_mi_tls_callback")
#pragma section(".CRT$XIU", long, read)
#else
#pragma comment(linker, "/INCLUDE:__mi_tls_callback")
#endif
#pragma data_seg(".CRT$XIU")
mi_decl_externc mi_crt_callback_t _mi_tls_callback[] = { &mi_process_attach };
#pragma data_seg()
#endif
// use the fiber api for calling `_mi_thread_done`.
#include <fibersapi.h>
#if (_WIN32_WINNT < 0x600) // before Windows Vista
WINBASEAPI DWORD WINAPI FlsAlloc( _In_opt_ PFLS_CALLBACK_FUNCTION lpCallback );
WINBASEAPI PVOID WINAPI FlsGetValue( _In_ DWORD dwFlsIndex );
WINBASEAPI BOOL WINAPI FlsSetValue( _In_ DWORD dwFlsIndex, _In_opt_ PVOID lpFlsData );
WINBASEAPI BOOL WINAPI FlsFree(_In_ DWORD dwFlsIndex);
#endif
static DWORD mi_fls_key = (DWORD)(-1);
static void NTAPI mi_fls_done(PVOID value) {
mi_heap_t* heap = (mi_heap_t*)value;
if (heap != NULL) {
_mi_thread_done(heap);
FlsSetValue(mi_fls_key, NULL); // prevent recursion as _mi_thread_done may set it back to the main heap, issue #672
}
}
void _mi_prim_thread_init_auto_done(void) {
mi_fls_key = FlsAlloc(&mi_fls_done);
}
void _mi_prim_thread_done_auto_done(void) {
// call thread-done on all threads (except the main thread) to prevent
// dangling callback pointer if statically linked with a DLL; Issue #208
FlsFree(mi_fls_key);
}
void _mi_prim_thread_associate_default_heap(mi_heap_t* heap) {
mi_assert_internal(mi_fls_key != (DWORD)(-1));
FlsSetValue(mi_fls_key, heap);
}
#endif
// ----------------------------------------------------
// Communicate with the redirection module on Windows
// ----------------------------------------------------
#if defined(MI_SHARED_LIB) && !defined(MI_WIN_NOREDIRECT)
#define MI_PRIM_HAS_ALLOCATOR_INIT 1
static bool mi_redirected = false; // true if malloc redirects to mi_malloc
bool _mi_is_redirected(void) {
return mi_redirected;
}
#ifdef __cplusplus
extern "C" {
#endif
mi_decl_export void _mi_redirect_entry(DWORD reason) {
// called on redirection; careful as this may be called before DllMain
#if MI_TLS_SLOT >= 2
if ((reason==DLL_PROCESS_ATTACH || reason==DLL_THREAD_ATTACH) && mi_prim_get_default_heap() == NULL) {
_mi_heap_set_default_direct((mi_heap_t*)&_mi_heap_empty);
}
#endif
if (reason == DLL_PROCESS_ATTACH) {
mi_redirected = true;
}
else if (reason == DLL_PROCESS_DETACH) {
mi_redirected = false;
}
else if (reason == DLL_THREAD_DETACH) {
_mi_thread_done(NULL);
}
}
__declspec(dllimport) bool mi_cdecl mi_allocator_init(const char** message);
__declspec(dllimport) void mi_cdecl mi_allocator_done(void);
#ifdef __cplusplus
}
#endif
bool _mi_allocator_init(const char** message) {
return mi_allocator_init(message);
}
void _mi_allocator_done(void) {
mi_allocator_done();
}
#endif

16
src/segment-map.c
View file

@ -22,7 +22,7 @@ terms of the MIT license. A copy of the license can be found in the file
#elif (MI_INTPTR_SIZE > 4)
#define MI_SEGMENT_MAP_MAX_ADDRESS (48*1024ULL*MI_GiB) // 48 TiB
#else
#define MI_SEGMENT_MAP_MAX_ADDRESS (MAX_UINT32)
#define MI_SEGMENT_MAP_MAX_ADDRESS (UINT32_MAX)
#endif
#define MI_SEGMENT_MAP_PART_SIZE (MI_INTPTR_SIZE*MI_KiB - 128) // 128 > sizeof(mi_memid_t) !
@ -55,11 +55,12 @@ static mi_segmap_part_t* mi_segment_map_index_of(const mi_segment_t* segment, bo
if (part == NULL) {
if (!create_on_demand) return NULL;
mi_memid_t memid;
part = (mi_segmap_part_t*)_mi_os_alloc(sizeof(mi_segmap_part_t), &memid, NULL);
part = (mi_segmap_part_t*)_mi_os_alloc(sizeof(mi_segmap_part_t), &memid);
if (part == NULL) return NULL;
part->memid = memid;
mi_segmap_part_t* expected = NULL;
if (!mi_atomic_cas_ptr_strong_release(mi_segmap_part_t, &mi_segment_map[segindex], &expected, part)) {
_mi_os_free(part, sizeof(mi_segmap_part_t), memid, NULL);
_mi_os_free(part, sizeof(mi_segmap_part_t), memid);
part = expected;
if (part == NULL) return NULL;
}
@ -124,3 +125,12 @@ static bool mi_is_valid_pointer(const void* p) {
mi_decl_nodiscard mi_decl_export bool mi_is_in_heap_region(const void* p) mi_attr_noexcept {
return mi_is_valid_pointer(p);
}
void _mi_segment_map_unsafe_destroy(void) {
for (size_t i = 0; i < MI_SEGMENT_MAP_MAX_PARTS; i++) {
mi_segmap_part_t* part = mi_atomic_exchange_ptr_relaxed(mi_segmap_part_t, &mi_segment_map[i], NULL);
if (part != NULL) {
_mi_os_free(part, sizeof(mi_segmap_part_t), part->memid);
}
}
}

190
src/segment.c
View file

@ -189,7 +189,7 @@ static void mi_segment_protect_range(void* p, size_t size, bool protect) {
}
}
static void mi_segment_protect(mi_segment_t* segment, bool protect, mi_os_tld_t* tld) {
static void mi_segment_protect(mi_segment_t* segment, bool protect) {
// add/remove guard pages
if (MI_SECURE != 0) {
// in secure mode, we set up a protected page in between the segment info and the page data
@ -207,7 +207,7 @@ static void mi_segment_protect(mi_segment_t* segment, bool protect, mi_os_tld_t*
if (protect && !segment->memid.initially_committed) {
if (protect) {
// ensure secure page is committed
if (_mi_os_commit(start, os_psize, NULL, tld->stats)) { // if this fails that is ok (as it is an unaccessible page)
if (_mi_os_commit(start, os_psize, NULL)) { // if this fails that is ok (as it is an unaccessible page)
mi_segment_protect_range(start, os_psize, protect);
}
}
@ -241,23 +241,23 @@ static void mi_page_purge(mi_segment_t* segment, mi_page_t* page, mi_segments_tl
if (!segment->allow_purge) return;
mi_assert_internal(page->used == 0);
mi_assert_internal(page->free == NULL);
mi_assert_expensive(!mi_pages_purge_contains(page, tld));
mi_assert_expensive(!mi_pages_purge_contains(page, tld)); MI_UNUSED(tld);
size_t psize;
void* start = mi_segment_raw_page_start(segment, page, &psize);
const bool needs_recommit = _mi_os_purge(start, psize, tld->stats);
const bool needs_recommit = _mi_os_purge(start, psize);
if (needs_recommit) { page->is_committed = false; }
}
static bool mi_page_ensure_committed(mi_segment_t* segment, mi_page_t* page, mi_segments_tld_t* tld) {
if (page->is_committed) return true;
mi_assert_internal(segment->allow_decommit);
mi_assert_expensive(!mi_pages_purge_contains(page, tld));
mi_assert_expensive(!mi_pages_purge_contains(page, tld)); MI_UNUSED(tld);
size_t psize;
uint8_t* start = mi_segment_raw_page_start(segment, page, &psize);
bool is_zero = false;
const size_t gsize = (MI_SECURE >= 2 ? _mi_os_page_size() : 0);
bool ok = _mi_os_commit(start, psize + gsize, &is_zero, tld->stats);
bool ok = _mi_os_commit(start, psize + gsize, &is_zero);
if (!ok) return false; // failed to commit!
page->is_committed = true;
page->used = 0;
@ -436,6 +436,8 @@ uint8_t* _mi_segment_page_start(const mi_segment_t* segment, const mi_page_t* pa
mi_assert_internal((uintptr_t)p % block_size == 0);
}
}
mi_assert_internal(_mi_is_aligned(p, MI_MAX_ALIGN_SIZE));
mi_assert_internal(block_size == 0 || block_size > MI_MAX_ALIGN_GUARANTEE || _mi_is_aligned(p,block_size));
if (page_size != NULL) *page_size = psize;
mi_assert_internal(_mi_ptr_page(p) == page);
@ -446,13 +448,18 @@ uint8_t* _mi_segment_page_start(const mi_segment_t* segment, const mi_page_t* pa
static size_t mi_segment_calculate_sizes(size_t capacity, size_t required, size_t* pre_size, size_t* info_size)
{
const size_t minsize = sizeof(mi_segment_t) + ((capacity - 1) * sizeof(mi_page_t)) + 16 /* padding */;
const size_t minsize = sizeof(mi_segment_t) + ((capacity - 1) * sizeof(mi_page_t)) + 16 /* padding */;
size_t guardsize = 0;
size_t isize = 0;
if (MI_SECURE == 0) {
// normally no guard pages
#if MI_GUARDED
isize = _mi_align_up(minsize, _mi_os_page_size());
#else
isize = _mi_align_up(minsize, 16 * MI_MAX_ALIGN_SIZE);
#endif
}
else {
// in secure mode, we set up a protected page in between the segment info
@ -460,7 +467,7 @@ static size_t mi_segment_calculate_sizes(size_t capacity, size_t required, size_
const size_t page_size = _mi_os_page_size();
isize = _mi_align_up(minsize, page_size);
guardsize = page_size;
required = _mi_align_up(required, page_size);
//required = _mi_align_up(required, isize + guardsize);
}
if (info_size != NULL) *info_size = isize;
@ -495,7 +502,7 @@ static void mi_segment_os_free(mi_segment_t* segment, size_t segment_size, mi_se
if (MI_SECURE != 0) {
mi_assert_internal(!segment->memid.is_pinned);
mi_segment_protect(segment, false, tld->os); // ensure no more guard pages are set
mi_segment_protect(segment, false); // ensure no more guard pages are set
}
bool fully_committed = true;
@ -509,7 +516,7 @@ static void mi_segment_os_free(mi_segment_t* segment, size_t segment_size, mi_se
MI_UNUSED(fully_committed);
mi_assert_internal((fully_committed && committed_size == segment_size) || (!fully_committed && committed_size < segment_size));
_mi_arena_free(segment, segment_size, committed_size, segment->memid, tld->stats);
_mi_arena_free(segment, segment_size, committed_size, segment->memid);
}
// called from `heap_collect`.
@ -530,7 +537,7 @@ void _mi_segments_collect(bool force, mi_segments_tld_t* tld) {
static mi_segment_t* mi_segment_os_alloc(bool eager_delayed, size_t page_alignment, mi_arena_id_t req_arena_id,
size_t pre_size, size_t info_size, bool commit, size_t segment_size,
mi_segments_tld_t* tld, mi_os_tld_t* tld_os)
mi_segments_tld_t* tld)
{
mi_memid_t memid;
bool allow_large = (!eager_delayed && (MI_SECURE == 0)); // only allow large OS pages once we are no longer lazy
@ -542,7 +549,7 @@ static mi_segment_t* mi_segment_os_alloc(bool eager_delayed, size_t page_alignme
segment_size = segment_size + (align_offset - pre_size); // adjust the segment size
}
mi_segment_t* segment = (mi_segment_t*)_mi_arena_alloc_aligned(segment_size, alignment, align_offset, commit, allow_large, req_arena_id, &memid, tld_os);
mi_segment_t* segment = (mi_segment_t*)_mi_arena_alloc_aligned(segment_size, alignment, align_offset, commit, allow_large, req_arena_id, &memid);
if (segment == NULL) {
return NULL; // failed to allocate
}
@ -550,10 +557,10 @@ static mi_segment_t* mi_segment_os_alloc(bool eager_delayed, size_t page_alignme
if (!memid.initially_committed) {
// ensure the initial info is committed
mi_assert_internal(!memid.is_pinned);
bool ok = _mi_os_commit(segment, pre_size, NULL, tld_os->stats);
bool ok = _mi_os_commit(segment, pre_size, NULL);
if (!ok) {
// commit failed; we cannot touch the memory: free the segment directly and return `NULL`
_mi_arena_free(segment, segment_size, 0, memid, tld_os->stats);
_mi_arena_free(segment, segment_size, 0, memid);
return NULL;
}
}
@ -571,7 +578,7 @@ static mi_segment_t* mi_segment_os_alloc(bool eager_delayed, size_t page_alignme
// Allocate a segment from the OS aligned to `MI_SEGMENT_SIZE` .
static mi_segment_t* mi_segment_alloc(size_t required, mi_page_kind_t page_kind, size_t page_shift, size_t page_alignment,
mi_arena_id_t req_arena_id, mi_segments_tld_t* tld, mi_os_tld_t* os_tld)
mi_arena_id_t req_arena_id, mi_segments_tld_t* tld)
{
// required is only > 0 for huge page allocations
mi_assert_internal((required > 0 && page_kind > MI_PAGE_LARGE)|| (required==0 && page_kind <= MI_PAGE_LARGE));
@ -603,7 +610,7 @@ static mi_segment_t* mi_segment_alloc(size_t required, mi_page_kind_t page_kind,
const bool init_commit = eager; // || (page_kind >= MI_PAGE_LARGE);
// Allocate the segment from the OS (segment_size can change due to alignment)
mi_segment_t* segment = mi_segment_os_alloc(eager_delayed, page_alignment, req_arena_id, pre_size, info_size, init_commit, init_segment_size, tld, os_tld);
mi_segment_t* segment = mi_segment_os_alloc(eager_delayed, page_alignment, req_arena_id, pre_size, info_size, init_commit, init_segment_size, tld);
if (segment == NULL) return NULL;
mi_assert_internal(segment != NULL && (uintptr_t)segment % MI_SEGMENT_SIZE == 0);
mi_assert_internal(segment->memid.is_pinned ? segment->memid.initially_committed : true);
@ -631,7 +638,7 @@ static mi_segment_t* mi_segment_alloc(size_t required, mi_page_kind_t page_kind,
segment->cookie = _mi_ptr_cookie(segment);
// set protection
mi_segment_protect(segment, true, tld->os);
mi_segment_protect(segment, true);
// insert in free lists for small and medium pages
if (page_kind <= MI_PAGE_MEDIUM) {
@ -645,6 +652,10 @@ static mi_segment_t* mi_segment_alloc(size_t required, mi_page_kind_t page_kind,
static void mi_segment_free(mi_segment_t* segment, bool force, mi_segments_tld_t* tld) {
MI_UNUSED(force);
mi_assert(segment != NULL);
// in `mi_segment_force_abandon` we set this to true to ensure the segment's memory stays valid
if (segment->dont_free) return;
// don't purge as we are freeing now
mi_segment_remove_all_purges(segment, false /* don't force as we are about to free */, tld);
mi_segment_remove_from_free_queue(segment, tld);
@ -945,6 +956,9 @@ bool _mi_segment_attempt_reclaim(mi_heap_t* heap, mi_segment_t* segment) {
if (mi_atomic_load_relaxed(&segment->thread_id) != 0) return false; // it is not abandoned
if (segment->subproc != heap->tld->segments.subproc) return false; // only reclaim within the same subprocess
if (!_mi_heap_memid_is_suitable(heap,segment->memid)) return false; // don't reclaim between exclusive and non-exclusive arena's
const long target = _mi_option_get_fast(mi_option_target_segments_per_thread);
if (target > 0 && (size_t)target <= heap->tld->segments.count) return false; // don't reclaim if going above the target count
// don't reclaim more from a `free` call than half the current segments
// this is to prevent a pure free-ing thread to start owning too many segments
// (but not for out-of-arena segments as that is the main way to be reclaimed for those)
@ -969,6 +983,13 @@ void _mi_abandoned_reclaim_all(mi_heap_t* heap, mi_segments_tld_t* tld) {
_mi_arena_field_cursor_done(&current);
}
static bool segment_count_is_within_target(mi_segments_tld_t* tld, size_t* ptarget) {
const size_t target = (size_t)mi_option_get_clamp(mi_option_target_segments_per_thread, 0, 1024);
if (ptarget != NULL) { *ptarget = target; }
return (target == 0 || tld->count < target);
}
static long mi_segment_get_reclaim_tries(mi_segments_tld_t* tld) {
// limit the tries to 10% (default) of the abandoned segments with at least 8 and at most 1024 tries.
const size_t perc = (size_t)mi_option_get_clamp(mi_option_max_segment_reclaim, 0, 100);
@ -991,7 +1012,7 @@ static mi_segment_t* mi_segment_try_reclaim(mi_heap_t* heap, size_t block_size,
mi_segment_t* segment = NULL;
mi_arena_field_cursor_t current;
_mi_arena_field_cursor_init(heap, tld->subproc, false /* non-blocking */, &current);
while ((max_tries-- > 0) && ((segment = _mi_arena_segment_clear_abandoned_next(&current)) != NULL))
while (segment_count_is_within_target(tld,NULL) && (max_tries-- > 0) && ((segment = _mi_arena_segment_clear_abandoned_next(&current)) != NULL))
{
mi_assert(segment->subproc == heap->tld->segments.subproc); // cursor only visits segments in our sub-process
segment->abandoned_visits++;
@ -1016,8 +1037,8 @@ static mi_segment_t* mi_segment_try_reclaim(mi_heap_t* heap, size_t block_size,
result = mi_segment_reclaim(segment, heap, block_size, reclaimed, tld);
break;
}
else if (segment->abandoned_visits >= 3 && is_suitable) {
// always reclaim on 3rd visit to limit the list length.
else if (segment->abandoned_visits > 3 && is_suitable) {
// always reclaim on 3rd visit to limit the abandoned segment count.
mi_segment_reclaim(segment, heap, 0, NULL, tld);
}
else {
@ -1031,15 +1052,104 @@ static mi_segment_t* mi_segment_try_reclaim(mi_heap_t* heap, size_t block_size,
}
/* -----------------------------------------------------------
Force abandon a segment that is in use by our thread
----------------------------------------------------------- */
// force abandon a segment
static void mi_segment_force_abandon(mi_segment_t* segment, mi_segments_tld_t* tld)
{
mi_assert_internal(segment->abandoned < segment->used);
mi_assert_internal(!segment->dont_free);
// ensure the segment does not get free'd underneath us (so we can check if a page has been freed in `mi_page_force_abandon`)
segment->dont_free = true;
// for all pages
for (size_t i = 0; i < segment->capacity; i++) {
mi_page_t* page = &segment->pages[i];
if (page->segment_in_use) {
// abandon the page if it is still in-use (this will free the page if possible as well (but not our segment))
mi_assert_internal(segment->used > 0);
if (segment->used == segment->abandoned+1) {
// the last page.. abandon and return as the segment will be abandoned after this
// and we should no longer access it.
segment->dont_free = false;
_mi_page_force_abandon(page);
return;
}
else {
// abandon and continue
_mi_page_force_abandon(page);
}
}
}
segment->dont_free = false;
mi_assert(segment->used == segment->abandoned);
mi_assert(segment->used == 0);
if (segment->used == 0) { // paranoia
// all free now
mi_segment_free(segment, false, tld);
}
else {
// perform delayed purges
mi_pages_try_purge(false /* force? */, tld);
}
}
// try abandon segments.
// this should be called from `reclaim_or_alloc` so we know all segments are (about) fully in use.
static void mi_segments_try_abandon_to_target(mi_heap_t* heap, size_t target, mi_segments_tld_t* tld) {
if (target <= 1) return;
const size_t min_target = (target > 4 ? (target*3)/4 : target); // 75%
// todo: we should maintain a list of segments per thread; for now, only consider segments from the heap full pages
for (int i = 0; i < 64 && tld->count >= min_target; i++) {
mi_page_t* page = heap->pages[MI_BIN_FULL].first;
while (page != NULL && mi_page_is_huge(page)) {
page = page->next;
}
if (page==NULL) {
break;
}
mi_segment_t* segment = _mi_page_segment(page);
mi_segment_force_abandon(segment, tld);
mi_assert_internal(page != heap->pages[MI_BIN_FULL].first); // as it is just abandoned
}
}
// try abandon segments.
// this should be called from `reclaim_or_alloc` so we know all segments are (about) fully in use.
static void mi_segments_try_abandon(mi_heap_t* heap, mi_segments_tld_t* tld) {
// we call this when we are about to add a fresh segment so we should be under our target segment count.
size_t target = 0;
if (segment_count_is_within_target(tld, &target)) return;
mi_segments_try_abandon_to_target(heap, target, tld);
}
void mi_collect_reduce(size_t target_size) mi_attr_noexcept {
mi_collect(true);
mi_heap_t* heap = mi_heap_get_default();
mi_segments_tld_t* tld = &heap->tld->segments;
size_t target = target_size / MI_SEGMENT_SIZE;
if (target == 0) {
target = (size_t)mi_option_get_clamp(mi_option_target_segments_per_thread, 1, 1024);
}
mi_segments_try_abandon_to_target(heap, target, tld);
}
/* -----------------------------------------------------------
Reclaim or allocate
----------------------------------------------------------- */
static mi_segment_t* mi_segment_reclaim_or_alloc(mi_heap_t* heap, size_t block_size, mi_page_kind_t page_kind, size_t page_shift, mi_segments_tld_t* tld, mi_os_tld_t* os_tld)
static mi_segment_t* mi_segment_reclaim_or_alloc(mi_heap_t* heap, size_t block_size, mi_page_kind_t page_kind, size_t page_shift, mi_segments_tld_t* tld)
{
mi_assert_internal(page_kind <= MI_PAGE_LARGE);
mi_assert_internal(block_size <= MI_LARGE_OBJ_SIZE_MAX);
// try to abandon some segments to increase reuse between threads
mi_segments_try_abandon(heap,tld);
// 1. try to reclaim an abandoned segment
bool reclaimed;
mi_segment_t* segment = mi_segment_try_reclaim(heap, block_size, page_kind, &reclaimed, tld);
@ -1054,7 +1164,7 @@ static mi_segment_t* mi_segment_reclaim_or_alloc(mi_heap_t* heap, size_t block_s
return segment;
}
// 2. otherwise allocate a fresh segment
return mi_segment_alloc(0, page_kind, page_shift, 0, heap->arena_id, tld, os_tld);
return mi_segment_alloc(0, page_kind, page_shift, 0, heap->arena_id, tld);
}
@ -1093,11 +1203,11 @@ static mi_page_t* mi_segment_page_try_alloc_in_queue(mi_heap_t* heap, mi_page_ki
return NULL;
}
static mi_page_t* mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, mi_page_kind_t kind, size_t page_shift, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) {
static mi_page_t* mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, mi_page_kind_t kind, size_t page_shift, mi_segments_tld_t* tld) {
mi_page_t* page = mi_segment_page_try_alloc_in_queue(heap, kind, tld);
if (page == NULL) {
// possibly allocate or reclaim a fresh segment
mi_segment_t* const segment = mi_segment_reclaim_or_alloc(heap, block_size, kind, page_shift, tld, os_tld);
mi_segment_t* const segment = mi_segment_reclaim_or_alloc(heap, block_size, kind, page_shift, tld);
if (segment == NULL) return NULL; // return NULL if out-of-memory (or reclaimed)
mi_assert_internal(segment->page_kind==kind);
mi_assert_internal(segment->used < segment->capacity);
@ -1112,20 +1222,20 @@ static mi_page_t* mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, mi_p
return page;
}
static mi_page_t* mi_segment_small_page_alloc(mi_heap_t* heap, size_t block_size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) {
return mi_segment_page_alloc(heap, block_size, MI_PAGE_SMALL,MI_SMALL_PAGE_SHIFT,tld,os_tld);
static mi_page_t* mi_segment_small_page_alloc(mi_heap_t* heap, size_t block_size, mi_segments_tld_t* tld) {
return mi_segment_page_alloc(heap, block_size, MI_PAGE_SMALL,MI_SMALL_PAGE_SHIFT,tld);
}
static mi_page_t* mi_segment_medium_page_alloc(mi_heap_t* heap, size_t block_size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) {
return mi_segment_page_alloc(heap, block_size, MI_PAGE_MEDIUM, MI_MEDIUM_PAGE_SHIFT, tld, os_tld);
static mi_page_t* mi_segment_medium_page_alloc(mi_heap_t* heap, size_t block_size, mi_segments_tld_t* tld) {
return mi_segment_page_alloc(heap, block_size, MI_PAGE_MEDIUM, MI_MEDIUM_PAGE_SHIFT, tld);
}
/* -----------------------------------------------------------
large page allocation
----------------------------------------------------------- */
static mi_page_t* mi_segment_large_page_alloc(mi_heap_t* heap, size_t block_size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) {
mi_segment_t* segment = mi_segment_reclaim_or_alloc(heap,block_size,MI_PAGE_LARGE,MI_LARGE_PAGE_SHIFT,tld,os_tld);
static mi_page_t* mi_segment_large_page_alloc(mi_heap_t* heap, size_t block_size, mi_segments_tld_t* tld) {
mi_segment_t* segment = mi_segment_reclaim_or_alloc(heap,block_size,MI_PAGE_LARGE,MI_LARGE_PAGE_SHIFT,tld);
if (segment == NULL) return NULL;
mi_page_t* page = mi_segment_find_free(segment, tld);
mi_assert_internal(page != NULL);
@ -1135,9 +1245,9 @@ static mi_page_t* mi_segment_large_page_alloc(mi_heap_t* heap, size_t block_size
return page;
}
static mi_page_t* mi_segment_huge_page_alloc(size_t size, size_t page_alignment, mi_arena_id_t req_arena_id, mi_segments_tld_t* tld, mi_os_tld_t* os_tld)
static mi_page_t* mi_segment_huge_page_alloc(size_t size, size_t page_alignment, mi_arena_id_t req_arena_id, mi_segments_tld_t* tld)
{
mi_segment_t* segment = mi_segment_alloc(size, MI_PAGE_HUGE, MI_SEGMENT_SHIFT + 1, page_alignment, req_arena_id, tld, os_tld);
mi_segment_t* segment = mi_segment_alloc(size, MI_PAGE_HUGE, MI_SEGMENT_SHIFT + 1, page_alignment, req_arena_id, tld);
if (segment == NULL) return NULL;
mi_assert_internal(mi_segment_page_size(segment) - segment->segment_info_size - (2*(MI_SECURE == 0 ? 0 : _mi_os_page_size())) >= size);
#if MI_HUGE_PAGE_ABANDON
@ -1161,7 +1271,7 @@ static mi_page_t* mi_segment_huge_page_alloc(size_t size, size_t page_alignment,
mi_assert_internal(psize - (aligned_p - start) >= size);
uint8_t* decommit_start = start + sizeof(mi_block_t); // for the free list
ptrdiff_t decommit_size = aligned_p - decommit_start;
_mi_os_reset(decommit_start, decommit_size, os_tld->stats); // do not decommit as it may be in a region
_mi_os_reset(decommit_start, decommit_size); // do not decommit as it may be in a region
}
return page;
@ -1208,7 +1318,7 @@ void _mi_segment_huge_page_reset(mi_segment_t* segment, mi_page_t* page, mi_bloc
if (usize > sizeof(mi_block_t)) {
usize = usize - sizeof(mi_block_t);
uint8_t* p = (uint8_t*)block + sizeof(mi_block_t);
_mi_os_reset(p, usize, &_mi_stats_main);
_mi_os_reset(p, usize);
}
}
}
@ -1218,26 +1328,26 @@ void _mi_segment_huge_page_reset(mi_segment_t* segment, mi_page_t* page, mi_bloc
Page allocation
----------------------------------------------------------- */
mi_page_t* _mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, size_t page_alignment, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) {
mi_page_t* _mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, size_t page_alignment, mi_segments_tld_t* tld) {
mi_page_t* page;
if mi_unlikely(page_alignment > MI_BLOCK_ALIGNMENT_MAX) {
mi_assert_internal(_mi_is_power_of_two(page_alignment));
mi_assert_internal(page_alignment >= MI_SEGMENT_SIZE);
//mi_assert_internal((MI_SEGMENT_SIZE % page_alignment) == 0);
if (page_alignment < MI_SEGMENT_SIZE) { page_alignment = MI_SEGMENT_SIZE; }
page = mi_segment_huge_page_alloc(block_size, page_alignment, heap->arena_id, tld, os_tld);
page = mi_segment_huge_page_alloc(block_size, page_alignment, heap->arena_id, tld);
}
else if (block_size <= MI_SMALL_OBJ_SIZE_MAX) {
page = mi_segment_small_page_alloc(heap, block_size, tld, os_tld);
page = mi_segment_small_page_alloc(heap, block_size, tld);
}
else if (block_size <= MI_MEDIUM_OBJ_SIZE_MAX) {
page = mi_segment_medium_page_alloc(heap, block_size, tld, os_tld);
page = mi_segment_medium_page_alloc(heap, block_size, tld);
}
else if (block_size <= MI_LARGE_OBJ_SIZE_MAX /* || mi_is_good_fit(block_size, MI_LARGE_PAGE_SIZE - sizeof(mi_segment_t)) */ ) {
page = mi_segment_large_page_alloc(heap, block_size, tld, os_tld);
page = mi_segment_large_page_alloc(heap, block_size, tld);
}
else {
page = mi_segment_huge_page_alloc(block_size, page_alignment, heap->arena_id, tld, os_tld);
page = mi_segment_huge_page_alloc(block_size, page_alignment, heap->arena_id, tld);
}
mi_assert_expensive(page == NULL || mi_segment_is_valid(_mi_page_segment(page),tld));
mi_assert_internal(page == NULL || (mi_segment_page_size(_mi_page_segment(page)) - (MI_SECURE == 0 ? 0 : _mi_os_page_size())) >= block_size);

33
src/stats.c
View file

@ -26,7 +26,7 @@ static bool mi_is_in_main(void* stat) {
static void mi_stat_update(mi_stat_count_t* stat, int64_t amount) {
if (amount == 0) return;
if (mi_is_in_main(stat))
if mi_unlikely(mi_is_in_main(stat))
{
// add atomically (for abandoned pages)
int64_t current = mi_atomic_addi64_relaxed(&stat->current, amount);
@ -51,6 +51,27 @@ static void mi_stat_update(mi_stat_count_t* stat, int64_t amount) {
}
}
// Adjust stats to compensate; for example before committing a range,
// first adjust downwards with parts that were already committed so
// we avoid double counting.
static void mi_stat_adjust(mi_stat_count_t* stat, int64_t amount) {
if (amount == 0) return;
if mi_unlikely(mi_is_in_main(stat))
{
// adjust atomically
mi_atomic_addi64_relaxed(&stat->current, amount);
mi_atomic_addi64_relaxed(&stat->allocated, amount);
mi_atomic_addi64_relaxed(&stat->freed, amount);
}
else {
// don't affect the peak
stat->current += amount;
// add to both
stat->allocated += amount;
stat->freed += amount;
}
}
void _mi_stat_counter_increase(mi_stat_counter_t* stat, size_t amount) {
if (mi_is_in_main(stat)) {
mi_atomic_addi64_relaxed( &stat->count, 1 );
@ -70,6 +91,14 @@ void _mi_stat_decrease(mi_stat_count_t* stat, size_t amount) {
mi_stat_update(stat, -((int64_t)amount));
}
void _mi_stat_adjust_increase(mi_stat_count_t* stat, size_t amount) {
mi_stat_adjust(stat, (int64_t)amount);
}
void _mi_stat_adjust_decrease(mi_stat_count_t* stat, size_t amount) {
mi_stat_adjust(stat, -((int64_t)amount));
}
// must be thread safe as it is called from stats_merge
static void mi_stat_add(mi_stat_count_t* stat, const mi_stat_count_t* src, int64_t unit) {
if (stat==src) return;
@ -118,6 +147,7 @@ static void mi_stats_add(mi_stats_t* stats, const mi_stats_t* src) {
mi_stat_counter_add(&stats->searches, &src->searches, 1);
mi_stat_counter_add(&stats->normal_count, &src->normal_count, 1);
mi_stat_counter_add(&stats->huge_count, &src->huge_count, 1);
mi_stat_counter_add(&stats->guarded_alloc_count, &src->guarded_alloc_count, 1);
#if MI_STAT>1
for (size_t i = 0; i <= MI_BIN_HUGE; i++) {
if (src->normal_bins[i].allocated > 0 || src->normal_bins[i].freed > 0) {
@ -342,6 +372,7 @@ static void _mi_stats_print(mi_stats_t* stats, mi_output_fun* out0, void* arg0)
mi_stat_counter_print(&stats->commit_calls, "commits", out, arg);
mi_stat_counter_print(&stats->reset_calls, "resets", out, arg);
mi_stat_counter_print(&stats->purge_calls, "purges", out, arg);
mi_stat_counter_print(&stats->guarded_alloc_count, "guarded", out, arg);
mi_stat_print(&stats->threads, "threads", -1, out, arg);
mi_stat_counter_print_avg(&stats->searches, "searches", out, arg);
_mi_fprintf(out, arg, "%10s: %5zu\n", "numa nodes", _mi_os_numa_node_count());

128
test/main-override-static.c
View file

@ -7,10 +7,13 @@
#include <mimalloc.h>
#include <mimalloc-override.h> // redefines malloc etc.
static void mi_bins(void);
static void double_free1();
static void double_free2();
static void corrupt_free();
static void block_overflow1();
static void block_overflow2();
static void invalid_free();
static void test_aslr(void);
static void test_process_info(void);
@ -18,16 +21,21 @@ static void test_reserved(void);
static void negative_stat(void);
static void alloc_huge(void);
static void test_heap_walk(void);
static void test_canary_leak(void);
// static void test_large_pages(void);
int main() {
mi_version();
mi_stats_reset();
// test_large_pages();
// detect double frees and heap corruption
// double_free1();
// double_free2();
// corrupt_free();
// block_overflow1();
// block_overflow2();
test_canary_leak();
// test_aslr();
// invalid_free();
// test_reserved();
@ -35,6 +43,9 @@ int main() {
// test_heap_walk();
// alloc_huge();
// mi_bins();
void* p1 = malloc(78);
void* p2 = malloc(24);
free(p1);
@ -61,7 +72,7 @@ int main() {
//mi_stats_print(NULL);
// test_process_info();
return 0;
}
@ -76,6 +87,12 @@ static void block_overflow1() {
free(p);
}
static void block_overflow2() {
uint8_t* p = (uint8_t*)mi_malloc(16);
p[17] = 0;
free(p);
}
// The double free samples come ArcHeap [1] by Insu Yun (issue #161)
// [1]: https://arxiv.org/pdf/1903.00503.pdf
@ -216,6 +233,50 @@ static void test_heap_walk(void) {
mi_heap_visit_blocks(heap, true, &test_visit, NULL);
}
static void test_canary_leak(void) {
char* p = mi_mallocn_tp(char,23);
for(int i = 0; i < 23; i++) {
p[i] = '0'+i;
}
puts(p);
free(p);
}
// Experiment with huge OS pages
#if 0
#include <mimalloc/types.h>
#include <mimalloc/internal.h>
#include <unistd.h>
#include <sys/mman.h>
static void test_large_pages(void) {
mi_memid_t memid;
#if 0
size_t pages_reserved;
size_t page_size;
uint8_t* p = (uint8_t*)_mi_os_alloc_huge_os_pages(1, -1, 30000, &pages_reserved, &page_size, &memid);
const size_t req_size = pages_reserved * page_size;
#else
const size_t req_size = 64*MI_MiB;
uint8_t* p = (uint8_t*)_mi_os_alloc(req_size,&memid,NULL);
#endif
p[0] = 1;
//_mi_os_protect(p, _mi_os_page_size());
//_mi_os_unprotect(p, _mi_os_page_size());
//_mi_os_decommit(p, _mi_os_page_size(), NULL);
if (madvise(p, req_size, MADV_HUGEPAGE) == 0) {
printf("advised huge pages\n");
_mi_os_decommit(p, _mi_os_page_size(), NULL);
};
_mi_os_free(p, req_size, memid, NULL);
}
#endif
// ----------------------------
// bin size experiments
// ------------------------------
@ -234,11 +295,11 @@ static void test_heap_walk(void) {
static inline uint8_t mi_bsr32(uint32_t x);
#if defined(_MSC_VER)
#include <windows.h>
//#include <Windows.h>
#include <intrin.h>
static inline uint8_t mi_bsr32(uint32_t x) {
uint32_t idx;
_BitScanReverse((DWORD*)&idx, x);
_BitScanReverse(&idx, x);
return idx;
}
#elif defined(__GNUC__) || defined(__clang__)
@ -262,7 +323,7 @@ static inline uint8_t mi_bsr32(uint32_t x) {
}
#endif
/*
// Bit scan reverse: return the index of the highest bit.
uint8_t _mi_bsr(uintptr_t x) {
if (x == 0) return 0;
@ -275,7 +336,7 @@ uint8_t _mi_bsr(uintptr_t x) {
# error "define bsr for non-32 or 64-bit platforms"
#endif
}
*/
static inline size_t _mi_wsize_from_size(size_t size) {
@ -352,11 +413,20 @@ static inline uint8_t _mi_bin4(size_t size) {
return bin;
}
static size_t _mi_binx4(size_t bsize) {
if (bsize==0) return 0;
uint8_t b = mi_bsr32((uint32_t)bsize);
if (b <= 1) return bsize;
size_t bin = ((b << 1) | (bsize >> (b - 1))&0x01);
static size_t _mi_binx4(size_t wsize) {
size_t bin;
if (wsize <= 1) {
bin = 1;
}
else if (wsize <= 8) {
// bin = (wsize+1)&~1; // round to double word sizes
bin = (uint8_t)wsize;
}
else {
uint8_t b = mi_bsr32((uint32_t)wsize);
if (b <= 1) return wsize;
bin = ((b << 1) | (wsize >> (b - 1))&0x01) + 3;
}
return bin;
}
@ -368,22 +438,40 @@ static size_t _mi_binx8(size_t bsize) {
return bin;
}
static inline size_t mi_bin(size_t wsize) {
uint8_t bin;
if (wsize <= 1) {
bin = 1;
}
else if (wsize <= 8) {
// bin = (wsize+1)&~1; // round to double word sizes
bin = (uint8_t)wsize;
}
else {
wsize--;
// find the highest bit
uint8_t b = (uint8_t)mi_bsr32((uint32_t)wsize); // note: wsize != 0
// and use the top 3 bits to determine the bin (~12.5% worst internal fragmentation).
// - adjust with 3 because we use do not round the first 8 sizes
// which each get an exact bin
bin = ((b << 2) + (uint8_t)((wsize >> (b - 2)) & 0x03)) - 3;
}
return bin;
}
static void mi_bins(void) {
//printf(" QNULL(1), /* 0 */ \\\n ");
size_t last_bin = 0;
size_t min_bsize = 0;
size_t last_bsize = 0;
for (size_t bsize = 1; bsize < 2*1024; bsize++) {
size_t size = bsize * 64 * 1024;
size_t bin = _mi_binx8(bsize);
for (size_t wsize = 1; wsize <= (4*1024*1024) / 8 + 1024; wsize++) {
size_t bin = mi_bin(wsize);
if (bin != last_bin) {
printf("min bsize: %6zd, max bsize: %6zd, bin: %6zd\n", min_bsize, last_bsize, last_bin);
//printf("QNULL(%6zd), ", wsize);
//if (last_bin%8 == 0) printf("/* %i */ \\\n ", last_bin);
//printf("min bsize: %6zd, max bsize: %6zd, bin: %6zd\n", min_wsize, last_wsize, last_bin);
printf("QNULL(%6zd), ", wsize-1);
if (last_bin%8 == 0) printf("/* %zu */ \\\n ", last_bin);
last_bin = bin;
min_bsize = bsize;
}
last_bsize = bsize;
}
}
#endif

135
test/main-override.cpp
View file

@ -11,7 +11,7 @@
#include <iostream>
#include <thread>
#include <mimalloc.h>
//#include <mimalloc.h>
#include <assert.h>
#ifdef _WIN32
@ -37,28 +37,35 @@ static void tsan_numa_test(); // issue #414
static void strdup_test(); // issue #445
static void heap_thread_free_huge();
static void test_std_string(); // issue #697
static void test_thread_local(); // issue #944
// static void test_mixed0(); // issue #942
static void test_mixed1(); // issue #942
static void test_stl_allocators();
int main() {
// mi_stats_reset(); // ignore earlier allocations
test_std_string();
mi_stats_reset(); // ignore earlier allocations
various_tests();
test_mixed1();
//test_std_string();
//test_thread_local();
// heap_thread_free_huge();
/*
heap_thread_free_large();
heap_no_delete();
heap_late_free();
padding_shrink();
various_tests();
tsan_numa_test();
*/
/*
strdup_test();
test_stl_allocators();
test_mt_shutdown();
*/
//fail_aslr();
// mi_stats_print(NULL);
mi_stats_print(NULL);
return 0;
}
@ -101,6 +108,9 @@ static void various_tests() {
t = new (tbuf) Test(42);
t->~Test();
delete[] tbuf;
const char* ptr = ::_Getdays(); // test _base overrid
free((void*)ptr);
}
class Static {
@ -177,6 +187,89 @@ static void test_stl_allocators() {
#endif
}
#if 0
#include <algorithm>
#include <chrono>
#include <functional>
#include <iostream>
#include <thread>
#include <vector>
static void test_mixed0() {
std::vector<std::unique_ptr<std::size_t>> numbers(1024 * 1024 * 100);
std::vector<std::thread> threads(1);
std::atomic<std::size_t> index{};
auto start = std::chrono::system_clock::now();
for (auto& thread : threads) {
thread = std::thread{[&index, &numbers]() {
while (true) {
auto i = index.fetch_add(1, std::memory_order_relaxed);
if (i >= numbers.size()) return;
numbers[i] = std::make_unique<std::size_t>(i);
}
}};
}
for (auto& thread : threads) thread.join();
auto end = std::chrono::system_clock::now();
auto duration =
std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
std::cout << "Running on " << threads.size() << " threads took " << duration
<< std::endl;
}
#endif
void asd() {
void* p = malloc(128);
free(p);
}
static void test_mixed1() {
std::thread thread(asd);
thread.join();
}
#if 0
// issue #691
static char* cptr;
static void* thread1_allocate()
{
cptr = mi_calloc_tp(char,22085632);
return NULL;
}
static void* thread2_free()
{
assert(cptr);
mi_free(cptr);
cptr = NULL;
return NULL;
}
static void test_large_migrate(void) {
auto t1 = std::thread(thread1_allocate);
t1.join();
auto t2 = std::thread(thread2_free);
t2.join();
/*
pthread_t thread1, thread2;
pthread_create(&thread1, NULL, &thread1_allocate, NULL);
pthread_join(thread1, NULL);
pthread_create(&thread2, NULL, &thread2_free, NULL);
pthread_join(thread2, NULL);
*/
return;
}
#endif
// issue 445
static void strdup_test() {
#ifdef _MSC_VER
@ -312,3 +405,31 @@ static void tsan_numa_test() {
dummy_worker();
t1.join();
}
class MTest
{
char *data;
public:
MTest() { data = (char*)malloc(1024); }
~MTest() { free(data); };
};
thread_local MTest tlVariable;
void threadFun( int i )
{
printf( "Thread %d\n", i );
std::this_thread::sleep_for( std::chrono::milliseconds(100) );
}
void test_thread_local()
{
for( int i=1; i < 100; ++i )
{
std::thread t( threadFun, i );
t.join();
mi_stats_print(NULL);
}
return;
}

2
test/test-api-fill.c
View file

@ -271,7 +271,7 @@ int main(void) {
mi_free(p);
};
#if !(MI_TRACK_VALGRIND || MI_TRACK_ASAN)
#if !(MI_TRACK_VALGRIND || MI_TRACK_ASAN || MI_GUARDED)
CHECK_BODY("fill-freed-small") {
size_t malloc_size = MI_SMALL_SIZE_MAX / 2;
uint8_t* p = (uint8_t*)mi_malloc(malloc_size);

13
test/test-api.c
View file

@ -65,6 +65,15 @@ bool mem_is_zero(uint8_t* p, size_t size) {
int main(void) {
mi_option_disable(mi_option_verbose);
CHECK_BODY("malloc-aligned9a") { // test large alignments
void* p = mi_zalloc_aligned(1024 * 1024, 2);
mi_free(p);
p = mi_zalloc_aligned(1024 * 1024, 2);
mi_free(p);
result = true;
};
// ---------------------------------------------------
// Malloc
// ---------------------------------------------------
@ -157,6 +166,7 @@ int main(void) {
printf("malloc_aligned5: usable size: %zi\n", usable);
mi_free(p);
};
/*
CHECK_BODY("malloc-aligned6") {
bool ok = true;
for (size_t align = 1; align <= MI_BLOCK_ALIGNMENT_MAX && ok; align *= 2) {
@ -174,6 +184,7 @@ int main(void) {
}
result = ok;
};
*/
CHECK_BODY("malloc-aligned7") {
void* p = mi_malloc_aligned(1024,MI_BLOCK_ALIGNMENT_MAX);
mi_free(p);
@ -189,7 +200,7 @@ int main(void) {
}
result = ok;
};
CHECK_BODY("malloc-aligned9") {
CHECK_BODY("malloc-aligned9") { // test large alignments
bool ok = true;
void* p[8];
size_t sizes[8] = { 8, 512, 1024 * 1024, MI_BLOCK_ALIGNMENT_MAX, MI_BLOCK_ALIGNMENT_MAX + 1, 2 * MI_BLOCK_ALIGNMENT_MAX, 8 * MI_BLOCK_ALIGNMENT_MAX, 0 };

38
test/test-stress.c
View file

@ -22,20 +22,27 @@ terms of the MIT license.
#include <string.h>
#include <assert.h>
// #define MI_GUARDED
// #define USE_STD_MALLOC
// > mimalloc-test-stress [THREADS] [SCALE] [ITER]
//
// argument defaults
#if defined(MI_TSAN) // with thread-sanitizer reduce the threads to test within the azure pipeline limits
static int THREADS = 8;
static int SCALE = 25;
static int ITER = 200;
#elif defined(MI_UBSAN) // with undefined behaviours sanitizer reduce parameters to stay within the azure pipeline limits
static int ITER = 400;
#elif defined(MI_UBSAN) // with undefined behavious sanitizer reduce parameters to stay within the azure pipeline limits
static int THREADS = 8;
static int SCALE = 25;
static int ITER = 20;
#elif defined(MI_GUARDED) // with debug guard pages reduce parameters to stay within the azure pipeline limits
static int THREADS = 8;
static int SCALE = 10;
static int ITER = 10;
#else
static int THREADS = 32; // more repeatable if THREADS <= #processors
static int SCALE = 25; // scaling factor
static int SCALE = 50; // scaling factor
static int ITER = 50; // N full iterations destructing and re-creating all threads
#endif
@ -43,16 +50,11 @@ static int ITER = 50; // N full iterations destructing and re-creating a
#define STRESS // undefine for leak test
#ifndef NDEBUG
#define HEAP_WALK // walk the heap objects?
#endif
static bool allow_large_objects = true; // allow very large objects? (set to `true` if SCALE>100)
static bool allow_large_objects = false; // allow very large objects? (set to `true` if SCALE>100)
static size_t use_one_size = 0; // use single object size of `N * sizeof(uintptr_t)`?
static bool main_participates = false; // main thread participates as a worker too
// #define USE_STD_MALLOC
#ifdef USE_STD_MALLOC
#define custom_calloc(n,s) calloc(n,s)
#define custom_realloc(p,s) realloc(p,s)
@ -62,6 +64,10 @@ static bool main_participates = false; // main thread participates as a
#define custom_calloc(n,s) mi_calloc(n,s)
#define custom_realloc(p,s) mi_realloc(p,s)
#define custom_free(p) mi_free(p)
#ifndef NDEBUG
#define HEAP_WALK // walk the heap objects?
#endif
#endif
// transfer pointer between threads
@ -216,9 +222,9 @@ static void test_stress(void) {
uintptr_t r = rand();
for (int n = 0; n < ITER; n++) {
run_os_threads(THREADS, &stress);
#ifndef NDEBUG
#if !defined(NDEBUG) && !defined(USE_STD_MALLOC)
// switch between arena and OS allocation for testing
mi_option_set_enabled(mi_option_disallow_arena_alloc, (n%2)==1);
// mi_option_set_enabled(mi_option_disallow_arena_alloc, (n%2)==1);
#endif
#ifdef HEAP_WALK
size_t total = 0;
@ -232,7 +238,7 @@ static void test_stress(void) {
}
#ifndef NDEBUG
//mi_collect(false);
//mi_debug_show_arenas();
//mi_debug_show_arenas(true);
#endif
#if !defined(NDEBUG) || defined(MI_TSAN)
if ((n + 1) % 10 == 0) { printf("- iterations left: %3d\n", ITER - (n + 1)); }
@ -266,7 +272,7 @@ int main(int argc, char** argv) {
#ifdef HEAP_WALK
mi_option_enable(mi_option_visit_abandoned);
#endif
#ifndef NDEBUG
#if !defined(NDEBUG) && !defined(USE_STD_MALLOC)
mi_option_set(mi_option_arena_reserve, 32 * 1024 /* in kib = 32MiB */);
#endif
#ifndef USE_STD_MALLOC
@ -310,11 +316,11 @@ int main(int argc, char** argv) {
#ifndef USE_STD_MALLOC
#ifndef NDEBUG
mi_debug_show_arenas(true,true,true);
mi_debug_show_arenas(true);
mi_collect(true);
#endif
mi_stats_print(NULL);
#endif
#endif
mi_stats_print(NULL);
//bench_end_program();
return 0;
}