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daanx 2024-12-16 10:00:32 -08:00
parent 037cb167f8
commit d9397be178
2 changed files with 9 additions and 4 deletions
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4
include/mimalloc/types.h
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@ -321,9 +321,9 @@ typedef struct mi_page_s {
// The max object size are checked to not waste more than 12.5% internally over the page sizes.
// (Except for large pages since huge objects are allocated in 4MiB chunks)
#define MI_SMALL_MAX_OBJ_SIZE ((MI_SMALL_PAGE_SIZE-MI_PAGE_INFO_SIZE)/4) // < 8 KiB
#define MI_SMALL_MAX_OBJ_SIZE ((MI_SMALL_PAGE_SIZE-MI_PAGE_INFO_SIZE)/6) // < 11 KiB
#define MI_MEDIUM_MAX_OBJ_SIZE ((MI_MEDIUM_PAGE_SIZE-MI_PAGE_INFO_SIZE)/4) // < 128 KiB
#define MI_LARGE_MAX_OBJ_SIZE ((MI_LARGE_PAGE_SIZE-MI_PAGE_INFO_SIZE)/2) // < 2 MiB
#define MI_LARGE_MAX_OBJ_SIZE ((MI_LARGE_PAGE_SIZE-MI_PAGE_INFO_SIZE)/4) // < 1 MiB
#define MI_LARGE_MAX_OBJ_WSIZE (MI_LARGE_MAX_OBJ_SIZE/MI_SIZE_SIZE)

9
src/bitmap.h
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@ -210,15 +210,20 @@ bool _mi_bitmap_forall_set_ranges(mi_bitmap_t* bitmap, mi_forall_set_fun_t* visi
/* ----------------------------------------------------------------------------
Binned concurrent bitmap
Assigns a size class to each chunk such that small blocks don't cause too
much fragmentation by keeping chunks for larger blocks separate.
much fragmentation since we keep chunks for larger blocks separate.
---------------------------------------------------------------------------- */
// Size bins; larger bins are allowed to go into smaller bins.
// Since LARGE and MEDIUM are aligned (on word and byte boundaries respectively),
// they are larger than OTHER even though those can contain very large objects (but we
// don't want those in the MEDIUM or LARGE bins as these are variable size).
// SMALL can only be in small (and NONE), so they cannot fragment the larger bins.
typedef enum mi_bbin_e {
MI_BBIN_NONE, // no bin assigned yet (the chunk is completely free)
MI_BBIN_SMALL, // slice_count == 1
MI_BBIN_OTHER, // slice_count: any other from the other bins, and 1 <= slice_count <= MI_BCHUNK_BITS
MI_BBIN_MEDIUM, // slice_count == 8
MI_BBIN_LARGE, // slice_count == MI_BFIELD_BITS
MI_BBIN_OTHER, // slice_count > 1, and not 8 or MI_BFIELD_BITS
MI_BBIN_COUNT
} mi_bbin_t;