From 2b9408a45978dcda77407859148deeccf403c372 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Tue, 9 Nov 2010 14:51:13 +0100 Subject: cfq-iosched: don't schedule a dispatch for a non-idle queue Vivek suggests we don't need schedule a dispatch when an idle queue becomes nonidle. And he is right, cfq_should_preempt already covers the logic. Signed-off-by: Shaohua Li Signed-off-by: Jens Axboe --- block/cfq-iosched.c | 19 +------------------ 1 file changed, 1 insertion(+), 18 deletions(-) (limited to 'block') diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index ca4d19907243..f90519430be6 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -3523,25 +3523,8 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq) } } - if (!cfqd->rq_in_driver) { + if (!cfqd->rq_in_driver) cfq_schedule_dispatch(cfqd); - return; - } - /* - * A queue is idle at cfq_dispatch_requests(), but it gets noidle - * later. We schedule a dispatch if the queue has no requests, - * otherwise the disk is actually in idle till all requests - * are finished even cfq_arm_slice_timer doesn't make the queue idle - * */ - cfqq = cfqd->active_queue; - if (!cfqq) - return; - - if (RB_EMPTY_ROOT(&cfqq->sort_list) && !cfq_should_idle(cfqd, cfqq) && - (!cfqd->cfq_group_idle || cfqq->cfqg->nr_cfqq > 1)) { - cfq_del_timer(cfqd, cfqq); - cfq_schedule_dispatch(cfqd); - } } /* -- cgit v1.2.3-59-g8ed1b