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Fix performance regression in arena_palloc().

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Pass large allocation requests to arena_malloc() when possible.  This
regression was introduced by 155bfa7da1
(Normalize size classes.).
This commit is contained in:
Jason Evans 2015-05-19 17:42:31 -07:00
parent 5aa50a2834
commit 5154175cf1
1 changed files with 13 additions and 2 deletions
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15
src/arena.c
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@ -2175,9 +2175,20 @@ arena_palloc(tsd_t *tsd, arena_t *arena, size_t usize, size_t alignment,
void *ret;
if (usize <= SMALL_MAXCLASS && (alignment < PAGE || (alignment == PAGE
&& (usize & PAGE_MASK) == 0)))
&& (usize & PAGE_MASK) == 0))) {
/* Small; alignment doesn't require special run placement. */
ret = arena_malloc(tsd, arena, usize, zero, tcache);
else {
} else if (usize <= arena_maxclass && alignment <= PAGE) {
/*
* Large; alignment doesn't require special run placement.
* However, the cached pointer may be at a random offset from
* the base of the run, so do some bit manipulation to retrieve
* the base.
*/
ret = arena_malloc(tsd, arena, usize, zero, tcache);
if (config_cache_oblivious)
ret = (void *)((uintptr_t)ret & ~PAGE_MASK);
} else {
if (likely(usize <= arena_maxclass)) {
ret = arena_palloc_large(tsd, arena, usize, alignment,
zero);