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allow smaller and larger default arena slice sizes

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Daan Leijen 2025-03-10 13:26:52 -07:00
parent ccc65d2fd9
commit 992a1ca820
6 changed files with 34 additions and 10 deletions
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1
include/mimalloc/bits.h
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@ -285,7 +285,6 @@ static inline size_t mi_clz(size_t x) {
// return false if `x==0` (with `*idx` undefined) and true otherwise,
// with the `idx` is set to the bit index (`0 <= *idx < MI_BFIELD_BITS`).
static inline bool mi_bsf(size_t x, size_t* idx) {
// we don't optimize anymore to lzcnt so we run correctly on older cpu's as well
#if defined(__GNUC__) && MI_ARCH_X64 && defined(__BMI1__) && (!defined(__clang_major__) || __clang_major__ >= 9)
// on x64 the carry flag is set on zero which gives better codegen
bool is_zero;

26
include/mimalloc/types.h
View file

@ -112,16 +112,26 @@ terms of the MIT license. A copy of the license can be found in the file
// (comments specify sizes on 64-bit, usually 32-bit is halved)
// --------------------------------------------------------------
// Sizes are for 64-bit
// Main size parameter; determines max arena sizes and max arena object sizes etc.
#ifndef MI_ARENA_SLICE_SHIFT
#ifdef MI_SMALL_PAGE_SHIFT // backward compatibility
#define MI_ARENA_SLICE_SHIFT MI_SMALL_PAGE_SHIFT
#else
#define MI_ARENA_SLICE_SHIFT (13 + MI_SIZE_SHIFT) // 64 KiB (32 KiB on 32-bit)
#ifdef MI_SMALL_PAGE_SHIFT // backward compatibility
#define MI_ARENA_SLICE_SHIFT MI_SMALL_PAGE_SHIFT
#else
#define MI_ARENA_SLICE_SHIFT (13 + MI_SIZE_SHIFT) // 64 KiB (32 KiB on 32-bit)
#endif
#endif
#if MI_ARENA_SLICE_SHIFT < 12
#error Arena slices should be at least 4KiB
#endif
#ifndef MI_BCHUNK_BITS_SHIFT
#define MI_BCHUNK_BITS_SHIFT (6 + MI_SIZE_SHIFT) // optimized for 512 bits per chunk (avx512)
#if MI_ARENA_SLICE_SHIFT <= 13 // <= 8KiB
#define MI_BCHUNK_BITS_SHIFT (7) // 128 bits
#elif MI_ARENA_SLICE_SHIFT < 16 // <= 32KiB
#define MI_BCHUNK_BITS_SHIFT (8) // 256 bits
#else
#define MI_BCHUNK_BITS_SHIFT (6 + MI_SIZE_SHIFT) // 512 bits (or 256 on 32-bit)
#endif
#endif
#define MI_BCHUNK_BITS (1 << MI_BCHUNK_BITS_SHIFT) // sub-bitmaps are "bchunks" of 512 bits
@ -134,6 +144,10 @@ terms of the MIT license. A copy of the license can be found in the file
#define MI_ARENA_MIN_OBJ_SIZE (MI_ARENA_MIN_OBJ_SLICES * MI_ARENA_SLICE_SIZE)
#define MI_ARENA_MAX_OBJ_SIZE (MI_ARENA_MAX_OBJ_SLICES * MI_ARENA_SLICE_SIZE)
#if MI_ARENA_MAX_OBJ_SIZE < MI_SIZE_SIZE*1024
#error maximum object size may be too small to hold local thread data
#endif
#define MI_SMALL_PAGE_SIZE MI_ARENA_MIN_OBJ_SIZE // 64 KiB
#define MI_MEDIUM_PAGE_SIZE (8*MI_SMALL_PAGE_SIZE) // 512 KiB (=byte in the bchunk bitmap)
#define MI_LARGE_PAGE_SIZE (MI_SIZE_SIZE*MI_MEDIUM_PAGE_SIZE) // 4 MiB (=word in the bchunk bitmap)