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dm cache policy smq: only demote entries in bottom half of the clean multiqueue

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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: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2017-05-11 05:07:34 -04:00 committed by Mike Snitzer
parent 072792dcdf
commit a8cd1eba61
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-cache-policy-smq.c
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@ -1190,7 +1190,7 @@ static void queue_demotion(struct smq_policy *mq)
if (unlikely(WARN_ON_ONCE(!mq->migrations_allowed)))
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 (!clean_target_met(mq, false))
queue_writeback(mq);