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Remove a branch from cache_bin_alloc_easy

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Combine the branches for checking for an empty cache_bin, and
checking for the low watermark.
This commit is contained in:
Dave Watson 2018-10-08 12:29:57 -07:00
parent 856319dc8a
commit 09adf18f1a
1 changed files with 15 additions and 10 deletions
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25
include/jemalloc/internal/cache_bin.h
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@ -88,11 +88,21 @@ JEMALLOC_ALWAYS_INLINE void *
cache_bin_alloc_easy(cache_bin_t *bin, bool *success) {
void *ret;
if (unlikely(bin->ncached == 0)) {
bin->low_water = -1;
*success = false;
return NULL;
bin->ncached--;
/*
* Check for both bin->ncached == 0 and ncached < low_water
* in a single branch.
*/
if (unlikely(bin->ncached <= bin->low_water)) {
bin->low_water = bin->ncached;
if (bin->ncached == -1) {
bin->ncached = 0;
*success = false;
return NULL;
}
}
/*
* success (instead of ret) should be checked upon the return of this
* function. We avoid checking (ret == NULL) because there is never a
@ -101,12 +111,7 @@ cache_bin_alloc_easy(cache_bin_t *bin, bool *success) {
* cacheline).
*/
*success = true;
ret = *(bin->avail - bin->ncached);
bin->ncached--;
if (unlikely(bin->ncached < bin->low_water)) {
bin->low_water = bin->ncached;
}
ret = *(bin->avail - (bin->ncached + 1));
return ret;
}