From e795421e40b39bf874c5ed9434365fb4a4b6c5d1 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Tue, 12 Jan 2016 16:24:15 +0100 Subject: cfq-iosched: Don't group_idle if cfqq has big thinktime There is no point in idling on a cfq group if the only cfq queue that is there has too big thinktime. Signed-off-by: Jan Kara Acked-by: Tejun Heo Signed-off-by: Jens Axboe --- block/cfq-iosched.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'block') diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 1f9093e901da..0a6a70a9bca8 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -2897,6 +2897,7 @@ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq) static void cfq_arm_slice_timer(struct cfq_data *cfqd) { struct cfq_queue *cfqq = cfqd->active_queue; + struct cfq_rb_root *st = cfqq->service_tree; struct cfq_io_cq *cic; unsigned long sl, group_idle = 0; @@ -2947,8 +2948,13 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) return; } - /* There are other queues in the group, don't do group idle */ - if (group_idle && cfqq->cfqg->nr_cfqq > 1) + /* + * There are other queues in the group or this is the only group and + * it has too big thinktime, don't do group idle. + */ + if (group_idle && + (cfqq->cfqg->nr_cfqq > 1 || + cfq_io_thinktime_big(cfqd, &st->ttime, true))) return; cfq_mark_cfqq_wait_request(cfqq); -- cgit v1.2.3-58-ga151