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Track low_water == -1 case explicitly.

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The -1 value of low_water indicates if the cache has been depleted and
refilled.  Track the status explicitly in the tcache struct.

This allows the fast path to check if (cur_ptr > low_water), instead of >=,
which avoids reaching slow path when the last item is allocated.
This commit is contained in:
Qi Wang 2019-08-20 18:14:18 -07:00 • committed by Qi Wang
parent 937ca1db9f
commit 0043e68d4c
5 changed files with 23 additions and 17 deletions
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2
include/jemalloc/internal/tcache_structs.h
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@ -51,6 +51,8 @@ struct tcache_s {
szind_t next_gc_bin;
/* For small bins, fill (ncached_max >> lg_fill_div). */
uint8_t lg_fill_div[SC_NBINS];
/* For small bins, whether has been refilled since last GC. */
bool bin_refilled[SC_NBINS];
/*
* We put the cache bins for large size classes at the end of the
* struct, since some of them might not get used. This might end up