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PA: Make mapped stat atomic.

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We always have atomic_zu_t, and mapped/unmapped transitions are always expensive
enough that trying to piggyback on a lock is a waste of time.
This commit is contained in:
David Goldblatt
2020-03-11 18:37:15 -07:00
committed by David Goldblatt
parent 3c28aa6f17
commit 436789ad96
6 changed files with 22 additions and 30 deletions
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10
include/jemalloc/internal/pa.h
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@@ -67,7 +67,7 @@ struct pa_shard_stats_s {
* Partially derived -- we maintain our own counter, but add in the
* base's own counter at merge.
*/
locked_zu_t mapped;
atomic_zu_t mapped;
/* Number of edata_t structs allocated by base, but not being used. */
size_t edata_avail; /* Derived. */
@@ -135,14 +135,6 @@ struct pa_shard_s {
base_t *base;
};
static inline void
pa_shard_stats_mapped_add(tsdn_t *tsdn, pa_shard_t *shard, size_t size) {
LOCKEDINT_MTX_LOCK(tsdn, *shard->stats_mtx);
locked_inc_zu(tsdn, LOCKEDINT_MTX(*shard->stats_mtx),
&shard->stats->mapped, size);
LOCKEDINT_MTX_UNLOCK(tsdn, *shard->stats_mtx);
}
static inline ssize_t
pa_shard_dirty_decay_ms_get(pa_shard_t *shard) {
return decay_ms_read(&shard->decay_dirty);