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experiment with larger small pages

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This commit is contained in:
daan 2019-07-11 15:44:37 -07:00
parent 9e9208eae8
commit a932e43650
3 changed files with 15 additions and 7 deletions
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4
include/mimalloc-types.h
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@ -75,8 +75,8 @@ terms of the MIT license. A copy of the license can be found in the file
// Main tuning parameters for segment and page sizes
// Sizes for 64-bit, divide by two for 32-bit
#define MI_SMALL_PAGE_SHIFT (13 + MI_INTPTR_SHIFT) // 64kb
#define MI_LARGE_PAGE_SHIFT ( 6 + MI_SMALL_PAGE_SHIFT) // 4mb
#define MI_SMALL_PAGE_SHIFT (14 + MI_INTPTR_SHIFT) // 64kb
#define MI_LARGE_PAGE_SHIFT ( 5 + MI_SMALL_PAGE_SHIFT) // 4mb
#define MI_SEGMENT_SHIFT ( MI_LARGE_PAGE_SHIFT) // 4mb
// Derived constants

2
src/options.c
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@ -35,7 +35,7 @@ static mi_option_desc_t options[_mi_option_last] = {
{ 0, UNINIT, "page_reset" },
{ 0, UNINIT, "cache_reset" },
{ 0, UNINIT, "pool_commit" },
{ 1, UNINIT, "eager_commit" }, // secure must have eager commit
{ 0, UNINIT, "eager_commit" }, // secure must have eager commit
{ 0, UNINIT, "large_os_pages" }, // use large OS pages
{ 0, UNINIT, "reset_decommits" },
{ 0, UNINIT, "reset_discards" },

16
src/segment.c
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@ -736,13 +736,21 @@ static mi_page_t* mi_segment_huge_page_alloc(size_t size, mi_segments_tld_t* tld
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_PAGE_SIZE / 8))
if (block_size <= (MI_SMALL_PAGE_SIZE / 8)) {
// smaller blocks than 8kb (assuming MI_SMALL_PAGE_SIZE == 64kb)
page = mi_segment_small_page_alloc(tld,os_tld);
else if (block_size < (MI_LARGE_SIZE_MAX - sizeof(mi_segment_t)))
page = mi_segment_large_page_alloc(tld, os_tld);
else
}
else if (block_size <= (MI_SMALL_PAGE_SIZE/2) && (MI_SMALL_PAGE_SIZE % block_size) <= (MI_SMALL_PAGE_SIZE / 8)) {
// use small page too if it happens to fit well
page = mi_segment_small_page_alloc(tld, os_tld);
}
else if (block_size < (MI_LARGE_SIZE_MAX - sizeof(mi_segment_t))) {
// otherwise use a large page
page = mi_segment_large_page_alloc(tld, os_tld);
}
else {
page = mi_segment_huge_page_alloc(block_size,tld,os_tld);
}
mi_assert_expensive(page == NULL || mi_segment_is_valid(_mi_page_segment(page)));
return page;
}