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enable initial lazy commit and optional decommit to reduce commit charge with many threads

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This commit is contained in:
daan 2019-08-24 15:00:55 -07:00
parent 612b2cc9b7
commit 6f5492cef8
6 changed files with 125 additions and 46 deletions
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14
src/os.c
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@ -44,10 +44,6 @@ static void* mi_align_up_ptr(void* p, size_t alignment) {
return (void*)_mi_align_up((uintptr_t)p, alignment);
}
static uintptr_t _mi_align_down(uintptr_t sz, size_t alignment) {
return (sz / alignment) * alignment;
}
static void* mi_align_down_ptr(void* p, size_t alignment) {
return (void*)_mi_align_down((uintptr_t)p, alignment);
}
@ -195,10 +191,14 @@ static bool mi_os_mem_free(void* addr, size_t size, mi_stats_t* stats)
}
#ifdef _WIN32
#define MEM_COMMIT_RESERVE (MEM_COMMIT|MEM_RESERVE)
static void* mi_win_virtual_allocx(void* addr, size_t size, size_t try_alignment, DWORD flags) {
#if defined(MEM_EXTENDED_PARAMETER_TYPE_BITS)
// on modern Windows try use NtAllocateVirtualMemoryEx for 1GiB huge pages
if ((size % (uintptr_t)1 << 30) == 0 /* 1GiB multiple */
if ((flags&MEM_COMMIT_RESERVE)==MEM_COMMIT_RESERVE
&& (size % (uintptr_t)1 << 30) == 0 /* 1GiB multiple */
&& (flags & MEM_LARGE_PAGES) != 0 && (flags & MEM_COMMIT) != 0
&& (addr != NULL || try_alignment == 0 || try_alignment % _mi_os_page_size() == 0)
&& pNtAllocateVirtualMemoryEx != NULL)
@ -250,7 +250,9 @@ static void* mi_win_virtual_allocx(void* addr, size_t size, size_t try_alignment
static void* mi_win_virtual_alloc(void* addr, size_t size, size_t try_alignment, DWORD flags, bool large_only) {
static volatile uintptr_t large_page_try_ok = 0;
void* p = NULL;
if (large_only || use_large_os_page(size, try_alignment)) {
if ((flags&MEM_COMMIT_RESERVE) == MEM_COMMIT_RESERVE
&& (large_only || use_large_os_page(size, try_alignment)))
{
uintptr_t try_ok = mi_atomic_read(&large_page_try_ok);
if (!large_only && try_ok > 0) {
// if a large page allocation fails, it seems the calls to VirtualAlloc get very expensive.