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dm cache policy smq: only demote entries in bottom half of the clean multiqueue
author
Joe Thornber
<ejt@redhat.com>
Thu, 11 May 2017 09:07:34 +0000
(
05:07
-0400)
committer
Mike Snitzer
<snitzer@redhat.com>
Mon, 15 May 2017 01:54:32 +0000
(21:54 -0400)
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>
drivers/md/dm-cache-policy-smq.c
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diff --git
a/drivers/md/dm-cache-policy-smq.c
b/drivers/md/dm-cache-policy-smq.c
index
72479bd
..
a177559
100644
(file)
--- a/
drivers/md/dm-cache-policy-smq.c
+++ b/
drivers/md/dm-cache-policy-smq.c
@@
-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);