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Add a hard limit on tcache max size class.

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For locality reasons, tcache bins are integrated in TSD.  Allowing all size
classes to be cached has little benefit, but takes up much thread local storage.
In addition, it complicates the layout which we try hard to optimize.
This commit is contained in:
Qi Wang 2020-10-15 16:37:16 -07:00 • committed by Qi Wang
parent 3de19ba401
commit 5e41ff9b74
4 changed files with 14 additions and 9 deletions
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12
src/tcache.c
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@ -936,20 +936,20 @@ tcache_ncached_max_compute(szind_t szind) {
bool
tcache_boot(tsdn_t *tsdn, base_t *base) {
/* If necessary, clamp opt_lg_tcache_max. */
if (opt_lg_tcache_max < 0 || (ZU(1) << opt_lg_tcache_max) <
SC_SMALL_MAXCLASS) {
tcache_maxclass = opt_lg_tcache_max < 0 ? 0 :
ZU(1) << opt_lg_tcache_max;
if (tcache_maxclass < SC_SMALL_MAXCLASS) {
tcache_maxclass = SC_SMALL_MAXCLASS;
} else {
tcache_maxclass = (ZU(1) << opt_lg_tcache_max);
} else if (tcache_maxclass > TCACHE_MAXCLASS_LIMIT) {
tcache_maxclass = TCACHE_MAXCLASS_LIMIT;
}
nhbins = sz_size2index(tcache_maxclass) + 1;
if (malloc_mutex_init(&tcaches_mtx, "tcaches", WITNESS_RANK_TCACHES,
malloc_mutex_rank_exclusive)) {
return true;
}
nhbins = sz_size2index(tcache_maxclass) + 1;
/* Initialize tcache_bin_info. */
tcache_bin_info = (cache_bin_info_t *)base_alloc(tsdn, base,
nhbins * sizeof(cache_bin_info_t), CACHELINE);