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decommit unused prefix of large aligned blocks

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daan 2022-11-07 16:41:40 -08:00
parent 27fc2cf17e
commit 2479d168ad
5 changed files with 63 additions and 28 deletions
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14
src/segment.c
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@ -1265,10 +1265,16 @@ static mi_page_t* mi_segment_huge_page_alloc(size_t size, size_t page_alignment,
if (page_alignment > 0) {
size_t psize;
size_t pre_size;
void* p = _mi_segment_page_start(segment, page, 0, &psize, &pre_size);
void* aligned_p = (void*)_mi_align_up((uintptr_t)p, page_alignment);
mi_assert_internal(page_alignment == 0 || _mi_is_aligned(aligned_p, page_alignment));
mi_assert_internal(page_alignment == 0 || psize - ((uint8_t*)aligned_p - (uint8_t*)p) >= size);
uint8_t* p = (uint8_t*)_mi_segment_page_start(segment, page, 0, &psize, &pre_size);
uint8_t* aligned_p = (uint8_t*)_mi_align_up((uintptr_t)p, page_alignment);
mi_assert_internal(_mi_is_aligned(aligned_p, page_alignment));
mi_assert_internal(psize - (aligned_p - p) >= size);
if (!segment->mem_is_pinned && page->is_committed) {
// decommit the part of the page that is unused; this can be quite large (close to MI_SEGMENT_SIZE)
uint8_t* decommit_start = p + sizeof(mi_block_t); // for the free list
ptrdiff_t decommit_size = aligned_p - decommit_start;
_mi_mem_decommit(decommit_start, decommit_size, os_tld);
}
}
#endif
// for huge pages we initialize the xblock_size as we may