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Commit a8cd1eba authored by Joe Thornber's avatar Joe Thornber Committed by Mike Snitzer
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dm cache policy smq: only demote entries in bottom half of the clean multiqueue 



Heavy IO load may mean there are very few clean blocks in the cache, and
we risk demoting entries that get hit a lot.

Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 072792dc

drivers/md/dm-cache-policy-smq.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -1190,7 +1190,7 @@ static void queue_demotion(struct smq_policy *mq) 
	if (unlikely(WARN_ON_ONCE(!mq->migrations_allowed)))

	if (unlikely(WARN_ON_ONCE(!mq->migrations_allowed)))

		return;

		return;





	e = q_peek(&mq->clean, mq->clean.nr_levels, true);

	e = q_peek(&mq->clean, mq->clean.nr_levels / 2, true);

	if (!e) {

	if (!e) {

		if (!clean_target_met(mq, false))

		if (!clean_target_met(mq, false))

			queue_writeback(mq);

			queue_writeback(mq);