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Impose a minimum tcache count for small size classes.

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Now that small allocation runs have fewer regions due to run metadata
residing in chunk headers, an explicit minimum tcache count is needed to
make sure that tcache adequately amortizes synchronization overhead.
This commit is contained in:
Jason Evans 2015-05-19 17:47:16 -07:00
parent 6591ff09d8
commit 836bbe9951
2 changed files with 10 additions and 1 deletions
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6
src/tcache.c
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@ -515,7 +515,11 @@ tcache_boot(void)
return (true);
stack_nelms = 0;
for (i = 0; i < NBINS; i++) {
if ((arena_bin_info[i].nregs << 1) <= TCACHE_NSLOTS_SMALL_MAX) {
if ((arena_bin_info[i].nregs << 1) <= TCACHE_NSLOTS_SMALL_MIN) {
tcache_bin_info[i].ncached_max =
TCACHE_NSLOTS_SMALL_MIN;
} else if ((arena_bin_info[i].nregs << 1) <=
TCACHE_NSLOTS_SMALL_MAX) {
tcache_bin_info[i].ncached_max =
(arena_bin_info[i].nregs << 1);
} else {