diff options
| author | Jan Kara <jack@suse.com> | 2016-01-12 16:24:15 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-02-04 09:50:11 -0700 |
| commit | e795421e40b39bf874c5ed9434365fb4a4b6c5d1 (patch) | |
| tree | 04e67435b036ca32fec2113c98e8a1257dba68ec /block | |
| parent | 36f90b0a2ddd60823fe193a85e60ff1906c2a9b3 (diff) | |
| download | linux-stable-e795421e40b39bf874c5ed9434365fb4a4b6c5d1.tar.gz linux-stable-e795421e40b39bf874c5ed9434365fb4a4b6c5d1.tar.bz2 linux-stable-e795421e40b39bf874c5ed9434365fb4a4b6c5d1.zip | |
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/cfq-iosched.c | 10 |
1 files changed, 8 insertions, 2 deletions
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); |