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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 <jack@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2016-01-12 16:24:15 +01:00 committed by Jens Axboe
parent 36f90b0a2d
commit e795421e40
1 changed files with 8 additions and 2 deletions
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10
block/cfq-iosched.c
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@ -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);