project-base/server-skynet-source-3rd-jemalloc
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Add branch hints to free_fastpath.

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Explicityly mark the non-slab case unlikely.  Previously there were jumps in the
common case.
This commit is contained in:
Qi Wang 2019-11-15 22:47:49 -08:00 committed by Qi Wang
parent a787d2f5b3
commit 7160617107
1 changed files with 11 additions and 11 deletions
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20
src/jemalloc.c
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@ -2647,8 +2647,6 @@ bool free_fastpath(void *ptr, size_t size, bool size_hint) {
return false; return false;
} }
tcache_t *tcache = tsd_tcachep_get(tsd);
alloc_ctx_t alloc_ctx; alloc_ctx_t alloc_ctx;
/* /*
* If !config_cache_oblivious, we can check PAGE alignment to * If !config_cache_oblivious, we can check PAGE alignment to
@ -2658,27 +2656,29 @@ bool free_fastpath(void *ptr, size_t size, bool size_hint) {
*/ */
if (!size_hint || config_cache_oblivious) { if (!size_hint || config_cache_oblivious) {
rtree_ctx_t *rtree_ctx = tsd_rtree_ctx(tsd); rtree_ctx_t *rtree_ctx = tsd_rtree_ctx(tsd);
bool res = rtree_szind_slab_read_fast(tsd_tsdn(tsd), &extents_rtree, bool res = rtree_szind_slab_read_fast(tsd_tsdn(tsd),
rtree_ctx, (uintptr_t)ptr, &extents_rtree, rtree_ctx, (uintptr_t)ptr, &alloc_ctx.szind,
&alloc_ctx.szind, &alloc_ctx.slab); &alloc_ctx.slab);
/* Note: profiled objects will have alloc_ctx.slab set */ /* Note: profiled objects will have alloc_ctx.slab set */
if (!res || !alloc_ctx.slab) { if (unlikely(!res || !alloc_ctx.slab)) {
return false; return false;
} }
assert(alloc_ctx.szind != SC_NSIZES); assert(alloc_ctx.szind != SC_NSIZES);
} else { } else {
/* /*
* Check for both sizes that are too large, and for sampled objects. * Check for both sizes that are too large, and for sampled
* Sampled objects are always page-aligned. The sampled object check * objects. Sampled objects are always page-aligned. The
* will also check for null ptr. * sampled object check will also check for null ptr.
*/ */
if (size > SC_LOOKUP_MAXCLASS || (((uintptr_t)ptr & PAGE_MASK) == 0)) { if (unlikely(size > SC_LOOKUP_MAXCLASS ||
(((uintptr_t)ptr & PAGE_MASK) == 0))) {
return false; return false;
} }
alloc_ctx.szind = sz_size2index_lookup(size); alloc_ctx.szind = sz_size2index_lookup(size);
} }
tcache_t *tcache = tsd_tcachep_get(tsd);
if (unlikely(ticker_trytick(&tcache->gc_ticker))) { if (unlikely(ticker_trytick(&tcache->gc_ticker))) {
return false; return false;
} }