project-base/server-skynet-source-3rd-jemalloc
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Only read szind if ptr is not paged aligned in sdallocx.

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If ptr is not page aligned, we know the allocation was not sampled. In this case
use the size passed into sdallocx directly w/o accessing rtree.  This improve
sdallocx efficiency in the common case (not sampled && small allocation).
This commit is contained in:
Qi Wang 2017-07-31 14:35:33 -07:00 committed by Qi Wang
parent 9a39b23c9c
commit 1ab2ab294c
1 changed files with 22 additions and 2 deletions
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24
src/jemalloc.c
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@ -2194,17 +2194,37 @@ isfree(tsd_t *tsd, void *ptr, size_t usize, tcache_t *tcache, bool slow_path) {
assert(malloc_initialized() || IS_INITIALIZER);
alloc_ctx_t alloc_ctx, *ctx;
if (config_prof && opt_prof) {
if (!config_cache_oblivious && ((uintptr_t)ptr & PAGE_MASK) != 0) {
/*
* When cache_oblivious is disabled and ptr is not page aligned,
* the allocation was not sampled -- usize can be used to
* determine szind directly.
*/
alloc_ctx.szind = sz_size2index(usize);
alloc_ctx.slab = true;
ctx = &alloc_ctx;
if (config_debug) {
alloc_ctx_t dbg_ctx;
rtree_ctx_t *rtree_ctx = tsd_rtree_ctx(tsd);
rtree_szind_slab_read(tsd_tsdn(tsd), &extents_rtree,
rtree_ctx, (uintptr_t)ptr, true, &dbg_ctx.szind,
&dbg_ctx.slab);
assert(dbg_ctx.szind == alloc_ctx.szind);
assert(dbg_ctx.slab == alloc_ctx.slab);
}
} else if (config_prof && opt_prof) {
rtree_ctx_t *rtree_ctx = tsd_rtree_ctx(tsd);
rtree_szind_slab_read(tsd_tsdn(tsd), &extents_rtree, rtree_ctx,
(uintptr_t)ptr, true, &alloc_ctx.szind, &alloc_ctx.slab);
assert(alloc_ctx.szind == sz_size2index(usize));
ctx = &alloc_ctx;
prof_free(tsd, ptr, usize, ctx);
} else {
ctx = NULL;
}
if (config_prof && opt_prof) {
prof_free(tsd, ptr, usize, ctx);
}
if (config_stats) {
*tsd_thread_deallocatedp_get(tsd) += usize;
}