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better object sizes for large objects

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This commit is contained in:
daan 2019-08-25 10:01:11 -07:00
parent 23812cc0ac
commit a431d80fc3
3 changed files with 13 additions and 12 deletions
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5
src/page.c
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@ -700,7 +700,10 @@ void mi_register_deferred_free(mi_deferred_free_fun* fn) mi_attr_noexcept {
General allocation
----------------------------------------------------------- */
// A huge page is allocated directly without being in a queue
// A huge page is allocated directly without being in a queue.
// Because huge pages contain just one block, and the segment contains
// just that page, we always treat them as abandoned and any thread
// that frees the block can free the whole page and segment directly.
static mi_page_t* mi_huge_page_alloc(mi_heap_t* heap, size_t size) {
size_t block_size = _mi_wsize_from_size(size) * sizeof(uintptr_t);
mi_assert_internal(_mi_bin(block_size) == MI_BIN_HUGE);

8
src/segment.c
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@ -709,17 +709,13 @@ static mi_page_t* mi_segment_huge_page_alloc(size_t size, mi_segments_tld_t* tld
/* -----------------------------------------------------------
Page allocation and free
----------------------------------------------------------- */
static bool mi_is_good_fit(size_t bsize, size_t size) {
// good fit if no more than 25% wasted
return (bsize > 0 && size > 0 && bsize < size && (size - (size % bsize)) < (size/4));
}
mi_page_t* _mi_segment_page_alloc(size_t block_size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) {
mi_page_t* page;
if (block_size <= MI_SMALL_OBJ_SIZE_MAX || mi_is_good_fit(block_size,MI_SMALL_PAGE_SIZE)) {
if (block_size <= MI_SMALL_OBJ_SIZE_MAX) {
page = mi_segment_small_page_alloc(tld,os_tld);
}
else if (block_size <= MI_MEDIUM_OBJ_SIZE_MAX || mi_is_good_fit(block_size, MI_MEDIUM_PAGE_SIZE)) {
else if (block_size <= MI_MEDIUM_OBJ_SIZE_MAX) {
page = mi_segment_medium_page_alloc(tld, os_tld);
}
else if (block_size <= MI_LARGE_OBJ_SIZE_MAX) {