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Commit deb71918 authored by Joe Thornber's avatar Joe Thornber Committed by Mike Snitzer
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dm cache policy smq: take origin idle status into account when queuing writebacks 



If the origin device is idle try and writeback more data.

Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 1e72a8e8

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

+4 −4
Original line number Diff line number Diff line
@@ -1158,13 +1158,13 @@ static void clear_pending(struct smq_policy *mq, struct entry *e) 
	e->pending_work = false;

}



static void queue_writeback(struct smq_policy *mq)

static void queue_writeback(struct smq_policy *mq, bool idle)

{

	int r;

	struct policy_work work;

	struct entry *e;



	e = q_peek(&mq->dirty, mq->dirty.nr_levels, !mq->migrations_allowed);

	e = q_peek(&mq->dirty, mq->dirty.nr_levels, idle);

	if (e) {

		mark_pending(mq, e);

		q_del(&mq->dirty, e);
@@ -1193,7 +1193,7 @@ static void queue_demotion(struct smq_policy *mq) 
	e = q_peek(&mq->clean, mq->clean.nr_levels / 2, true);

	if (!e) {

		if (!clean_target_met(mq, true))

			queue_writeback(mq);

			queue_writeback(mq, false);

		return;

	}
@@ -1429,7 +1429,7 @@ static int smq_get_background_work(struct dm_cache_policy *p, bool idle, 
	r = btracker_issue(mq->bg_work, result);

	if (r == -ENODATA) {

		if (!clean_target_met(mq, idle)) {

			queue_writeback(mq);

			queue_writeback(mq, idle);

			r = btracker_issue(mq->bg_work, result);

		}

	}