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Bug 1891918 - Update mozjemalloc's kCacheLineSize for Apple Silicon r=glandium

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Differential Revision: https://phabricator.services.mozilla.com/D207675
This commit is contained in:
Paul Bone 2024-04-18 05:13:15 +00:00
parent 07907ed334
commit fe67a785a1
1 changed files with 13 additions and 2 deletions
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15
memory/build/mozjemalloc.cpp
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@ -438,7 +438,13 @@ struct arena_chunk_t {
// Maximum size of L1 cache line. This is used to avoid cache line aliasing,
// so over-estimates are okay (up to a point), but under-estimates will
// negatively affect performance.
static const size_t kCacheLineSize = 64;
static const size_t kCacheLineSize =
#if defined(XP_DARWIN) && defined(__aarch64__)
128
#else
64
#endif
;
// Our size classes are inclusive ranges of memory sizes. By describing the
// minimums and how memory is allocated in each range the maximums can be
@ -1518,7 +1524,12 @@ MALLOC_RUNTIME_VAR PoisonType opt_poison = ALL;
MALLOC_RUNTIME_VAR PoisonType opt_poison = SOME;
#endif
MALLOC_RUNTIME_VAR size_t opt_poison_size = kCacheLineSize * 4;
// Keep this larger than and ideally a multiple of kCacheLineSize;
MALLOC_RUNTIME_VAR size_t opt_poison_size = 256;
#ifndef MALLOC_RUNTIME_CONFIG
static_assert(opt_poison_size >= kCacheLineSize);
static_assert((opt_poison_size % kCacheLineSize) == 0);
#endif
static bool opt_randomize_small = true;