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enable purging of free committed slices from arenas

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daanx 2024-12-13 13:17:00 -08:00
parent 42af184ce9
commit 4c81c3cf90
7 changed files with 222 additions and 56 deletions
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6
src/prim/unix/prim.c
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@ -61,6 +61,7 @@ terms of the MIT license. A copy of the license can be found in the file
#include <sys/syscall.h>
#endif
#define MI_UNIX_LARGE_PAGE_SIZE (2*MI_MiB) // TODO: can we query the OS for this?
//------------------------------------------------------------------------------------
// Use syscalls for some primitives to allow for libraries that override open/read/close etc.
@ -146,7 +147,7 @@ void _mi_prim_mem_init( mi_os_mem_config_t* config )
}
#endif
}
config->large_page_size = 2*MI_MiB; // TODO: can we query the OS for this?
config->large_page_size = MI_UNIX_LARGE_PAGE_SIZE;
config->has_overcommit = unix_detect_overcommit();
config->has_partial_free = true; // mmap can free in parts
config->has_virtual_reserve = true; // todo: check if this true for NetBSD? (for anonymous mmap with PROT_NONE)
@ -361,6 +362,9 @@ int _mi_prim_alloc(void* hint_addr, size_t size, size_t try_alignment, bool comm
mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0);
mi_assert_internal(commit || !allow_large);
mi_assert_internal(try_alignment > 0);
if (hint_addr == NULL && size >= 8*MI_UNIX_LARGE_PAGE_SIZE && try_alignment > 1 && _mi_is_power_of_two(try_alignment) && try_alignment < MI_UNIX_LARGE_PAGE_SIZE) {
try_alignment = MI_UNIX_LARGE_PAGE_SIZE; // try to align along large page size for larger allocations
}
*is_zero = true;
int protect_flags = (commit ? (PROT_WRITE | PROT_READ) : PROT_NONE);