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dm cache policy smq: make the cleaner policy write-back more aggressively 

By ignoring the sentinels the cleaner policy is able to write-back dirty
cache data much faster.  There is no reason to respect the sentinels,
which denote that a block was changed recently, when using the cleaner
policy given that the cleaner is tasked with writing back all dirty
data.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2017-03-31 10:46:54 -04:00 committed by Mike Snitzer
parent 449b668ce0
commit cc7e394024
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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@ -1166,7 +1166,7 @@ static void queue_writeback(struct smq_policy *mq)
struct policy_work work;
struct entry *e;
e = q_peek(&mq->dirty, mq->dirty.nr_levels, false);
e = q_peek(&mq->dirty, mq->dirty.nr_levels, !mq->migrations_allowed);
if (e) {
mark_pending(mq, e);
q_del(&mq->dirty, e);