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refine start offset in a page

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Daan Leijen 2023-03-20 12:39:15 -07:00
parent c935521bf9
commit a582d760ed
1 changed files with 5 additions and 1 deletions
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6
src/segment.c
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@ -318,7 +318,11 @@ static uint8_t* _mi_segment_page_start_from_slice(const mi_segment_t* segment, c
// make the start not OS page aligned for smaller blocks to avoid page/cache effects // make the start not OS page aligned for smaller blocks to avoid page/cache effects
// note: the offset must always be an xblock_size multiple since we assume small allocations // note: the offset must always be an xblock_size multiple since we assume small allocations
// are aligned (see `mi_heap_malloc_aligned`). // are aligned (see `mi_heap_malloc_aligned`).
size_t start_offset = (xblock_size >= MI_INTPTR_SIZE && xblock_size <= 512 ? xblock_size : 0); size_t start_offset = 0;
if (xblock_size >= MI_INTPTR_SIZE) {
if (xblock_size <= 64) { start_offset = 3*xblock_size; }
else if (xblock_size <= 512) { start_offset = xblock_size; }
}
if (page_size != NULL) { *page_size = psize - start_offset; } if (page_size != NULL) { *page_size = psize - start_offset; }
return (uint8_t*)segment + ((idx*MI_SEGMENT_SLICE_SIZE) + start_offset); return (uint8_t*)segment + ((idx*MI_SEGMENT_SLICE_SIZE) + start_offset);
} }