linux-kernel - [PATCH 1/5] cfq-iosched: Don't group

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Date:	Tue, 12 Jan 2016 16:24:15 +0100
From:	Jan Kara <jack@...e.cz>
To:	axboe@...nel.dk
Cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	Jeff Moyer <jmoyer@...hat.com>, Jan Kara <jack@...e.com>
Subject: [PATCH 1/5] cfq-iosched: Don't group_idle if cfqq has big thinktime

From: Jan Kara <jack@...e.com>

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@...e.com>
---
 block/cfq-iosched.c | 10 ++++++++--
 1 file 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);
-- 
2.6.2