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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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5
src/extent.c
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@ -966,10 +966,9 @@ extent_maximally_purge(tsdn_t *tsdn, pa_shard_t *shard, ehooks_t *ehooks,
LOCKEDINT_MTX(*shard->stats_mtx),
&shard->stats->decay_dirty.purged,
extent_size >> LG_PAGE);
locked_dec_zu(tsdn,
LOCKEDINT_MTX(*shard->stats_mtx),
&shard->stats->mapped, extent_size);
LOCKEDINT_MTX_UNLOCK(tsdn, *shard->stats_mtx);
atomic_fetch_sub_zu(&shard->stats->mapped, extent_size,
ATOMIC_RELAXED);
}
}