From edc71131c4dc6cc73e2a24aa0a7a79cfce738f12 Mon Sep 17 00:00:00 2001 From: Corrado Zoccolo Date: Wed, 9 Dec 2009 20:56:04 +0100 Subject: cfq-iosched: commenting non-obvious initialization Added a comment to explain the initialization of last_delayed_sync. Signed-off-by: Corrado Zoccolo Acked-by: Jeff Moyer Signed-off-by: Jens Axboe --- block/cfq-iosched.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'block/cfq-iosched.c') diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 98b15b98b85d..69ecee7f4ad4 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -3759,6 +3759,10 @@ static void *cfq_init_queue(struct request_queue *q) cfqd->cfq_latency = 1; cfqd->cfq_group_isolation = 0; cfqd->hw_tag = -1; + /* + * we optimistically start assuming sync ops weren't delayed in last + * second, in order to have larger depth for async operations. + */ cfqd->last_delayed_sync = jiffies - HZ; INIT_RCU_HEAD(&cfqd->rcu); return cfqd; -- cgit v1.2.3-59-g8ed1b