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Properly trigger decay on tcache destory.

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When destroying tcache, decay may not be triggered since tsd is non-nominal.
Explicitly decay to avoid pathological cases.
This commit is contained in:
Qi Wang 2018-11-08 12:24:38 -08:00 committed by Qi Wang
parent d66f976628
commit 7ee0b6cc37
1 changed files with 18 additions and 0 deletions
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18
src/tcache.c
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@ -497,6 +497,7 @@ tcache_flush(tsd_t *tsd) {
static void
tcache_destroy(tsd_t *tsd, tcache_t *tcache, bool tsd_tcache) {
tcache_flush_cache(tsd, tcache);
arena_t *arena = tcache->arena;
tcache_arena_dissociate(tsd_tsdn(tsd), tcache);
if (tsd_tcache) {
@ -509,6 +510,23 @@ tcache_destroy(tsd_t *tsd, tcache_t *tcache, bool tsd_tcache) {
/* Release both the tcache struct and avail array. */
idalloctm(tsd_tsdn(tsd), tcache, NULL, NULL, true, true);
}
/*
* The deallocation and tcache flush above may not trigger decay since
* we are on the tcache shutdown path (potentially with non-nominal
* tsd). Manually trigger decay to avoid pathological cases. Also
* include arena 0 because the tcache array is allocated from it.
*/
arena_decay(tsd_tsdn(tsd), arena_get(tsd_tsdn(tsd), 0, false),
false, false);
unsigned nthreads = arena_nthreads_get(arena, false);
if (nthreads == 0) {
/* Force purging when no threads assigned to the arena anymore. */
arena_decay(tsd_tsdn(tsd), arena, false, true);
} else {
arena_decay(tsd_tsdn(tsd), arena, false, false);
}
}
/* For auto tcache (embedded in TSD) only. */