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reduce medium page block size to 64k to reducemem usage

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Daan Leijen 2025-03-03 20:50:21 -08:00
parent ce74c905f8
commit c18a5537dc
3 changed files with 4 additions and 4 deletions
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4
include/mimalloc/types.h
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@ -343,10 +343,10 @@ typedef struct mi_page_s {
// The max object size are checked to not waste more than 12.5% internally over the page sizes. // The max object size are checked to not waste more than 12.5% internally over the page sizes.
#define MI_SMALL_MAX_OBJ_SIZE ((MI_SMALL_PAGE_SIZE-MI_PAGE_INFO_SIZE)/8) // < ~8 KiB #define MI_SMALL_MAX_OBJ_SIZE ((MI_SMALL_PAGE_SIZE-MI_PAGE_INFO_SIZE)/8) // < ~8 KiB
#if MI_ENABLE_LARGE_PAGES #if MI_ENABLE_LARGE_PAGES
#define MI_MEDIUM_MAX_OBJ_SIZE ((MI_MEDIUM_PAGE_SIZE-MI_PAGE_INFO_SIZE)/8) // < 64 KiB #define MI_MEDIUM_MAX_OBJ_SIZE ((MI_MEDIUM_PAGE_SIZE-MI_PAGE_INFO_SIZE)/8) // < ~64 KiB
#define MI_LARGE_MAX_OBJ_SIZE (MI_LARGE_PAGE_SIZE/8) // <= 512KiB // note: this must be a nice power of 2 or we get rounding issues with `_mi_bin` #define MI_LARGE_MAX_OBJ_SIZE (MI_LARGE_PAGE_SIZE/8) // <= 512KiB // note: this must be a nice power of 2 or we get rounding issues with `_mi_bin`
#else #else
#define MI_MEDIUM_MAX_OBJ_SIZE (MI_MEDIUM_PAGE_SIZE/4) // <= 128 KiB #define MI_MEDIUM_MAX_OBJ_SIZE (MI_MEDIUM_PAGE_SIZE/8) // <= 64 KiB
#define MI_LARGE_MAX_OBJ_SIZE MI_MEDIUM_MAX_OBJ_SIZE // note: this must be a nice power of 2 or we get rounding issues with `_mi_bin` #define MI_LARGE_MAX_OBJ_SIZE MI_MEDIUM_MAX_OBJ_SIZE // note: this must be a nice power of 2 or we get rounding issues with `_mi_bin`
#endif #endif
#define MI_LARGE_MAX_OBJ_WSIZE (MI_LARGE_MAX_OBJ_SIZE/MI_SIZE_SIZE) #define MI_LARGE_MAX_OBJ_WSIZE (MI_LARGE_MAX_OBJ_SIZE/MI_SIZE_SIZE)

2
src/bitmap.c
View file

@ -1560,7 +1560,7 @@ static inline bool mi_bbitmap_try_find_and_clear_generic(mi_bbitmap_t* bbitmap,
const mi_bfield_t cmap_entry = mi_atomic_load_relaxed(&bbitmap->chunkmap.bfields[cmap_idx]); const mi_bfield_t cmap_entry = mi_atomic_load_relaxed(&bbitmap->chunkmap.bfields[cmap_idx]);
const size_t cmap_entry_cycle = (cmap_idx != cmap_acc ? MI_BFIELD_BITS : cmap_acc_bits); const size_t cmap_entry_cycle = (cmap_idx != cmap_acc ? MI_BFIELD_BITS : cmap_acc_bits);
size_t eidx = 0; size_t eidx = 0;
mi_bfield_cycle_iterate(cmap_entry, tseq%8, cmap_entry_cycle, eidx, Y) mi_bfield_cycle_iterate(cmap_entry, tseq, cmap_entry_cycle, eidx, Y)
{ {
mi_assert_internal(eidx <= MI_BFIELD_BITS); mi_assert_internal(eidx <= MI_BFIELD_BITS);

2
src/options.c
View file

@ -175,7 +175,7 @@ static mi_option_desc_t options[_mi_option_last] =
{ 0, UNINIT, MI_OPTION(max_vabits) }, // max virtual address space bits { 0, UNINIT, MI_OPTION(max_vabits) }, // max virtual address space bits
{ MI_DEFAULT_PAGEMAP_COMMIT, { MI_DEFAULT_PAGEMAP_COMMIT,
UNINIT, MI_OPTION(pagemap_commit) }, // commit the full pagemap upfront? UNINIT, MI_OPTION(pagemap_commit) }, // commit the full pagemap upfront?
{ 0, UNINIT, MI_OPTION(page_commit_on_demand) }, // commit pages on-demand (2 disables this only on overcommit systems (like Linux)) { 1, UNINIT, MI_OPTION(page_commit_on_demand) }, // commit pages on-demand (2 disables this only on overcommit systems (like Linux))
{ 16, UNINIT, MI_OPTION(page_reclaim_max) }, // don't reclaim pages if we already own N pages (in that size class) { 16, UNINIT, MI_OPTION(page_reclaim_max) }, // don't reclaim pages if we already own N pages (in that size class)
}; };