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various improvements

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This commit is contained in:
daanx 2024-12-09 14:31:43 -08:00
parent 68ac94c1ba
commit d5ed0cc71e
10 changed files with 223 additions and 152 deletions
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13
src/os.c
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@ -203,10 +203,9 @@ 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 a direct allocation if the alignment is below the default, or if larger than 1/64 fraction of the size (to avoid waste).
const bool try_direct_alloc = (alignment <= mi_os_mem_config.alloc_granularity || alignment > size/64);
// try a direct allocation if the alignment is below the default, or if larger than 1/8 fraction of the size.
const bool try_direct_alloc = (alignment <= mi_os_mem_config.alloc_granularity || alignment > size/8);
// try first with a requested alignment hint (this will usually be aligned directly on Win 10+ or BSD)
void* p = NULL;
if (try_direct_alloc) {
p = mi_os_prim_alloc(size, alignment, commit, allow_large, is_large, is_zero);
@ -233,8 +232,8 @@ static void* mi_os_prim_alloc_aligned(size_t size, size_t alignment, bool commit
if (p == NULL) return NULL;
// set p to the aligned part in the full region
// note: this is dangerous on Windows as VirtualFree needs the actual base pointer
// this is handled though by having the `base` field in the memid's
// note: on Windows VirtualFree needs the actual base pointer
// this is handledby having the `base` field in the memid.
*base = p; // remember the base
p = _mi_align_up_ptr(p, alignment);
@ -361,7 +360,7 @@ static void* mi_os_page_align_areax(bool conservative, void* addr, size_t size,
if (newsize != NULL) *newsize = 0;
if (size == 0 || addr == NULL) return NULL;
// page align conservatively within the range
// page align conservatively within the range, or liberally straddling pages outside the range
void* start = (conservative ? _mi_align_up_ptr(addr, _mi_os_page_size())
: mi_align_down_ptr(addr, _mi_os_page_size()));
void* end = (conservative ? mi_align_down_ptr((uint8_t*)addr + size, _mi_os_page_size())
@ -472,7 +471,7 @@ bool _mi_os_purge_ex(void* p, size_t size, bool allow_reset)
return needs_recommit;
}
else {
if (allow_reset) { // this can sometimes be not allowed if the range is not fully committed
if (allow_reset) { // this can sometimes be not allowed if the range is not fully committed (on Windows, we cannot reset uncommitted memory)
_mi_os_reset(p, size);
}
return false; // needs no recommit