linux-kernel - [PATCH] CFQ: Don't store left slice when slice used up or for a idle workload

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Date:	Tue, 13 Jul 2010 10:21:21 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Vivek Goyal <vgoyal@...hat.com>,
	Corrado Zoccolo <czoccolo@...il.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: [PATCH] CFQ: Don't store left slice when slice used up or for a idle
 workload

It doesn't make sence to store left time slice for an idle workload
or for the cfqq that uses up its slice.

Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
---
 block/cfq-iosched.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index eb4086f..d985e38 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3418,7 +3418,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
 		 * - when there is a close cooperator
 		 */
 		if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq))
-			cfq_slice_expired(cfqd, 1);
+			cfq_slice_expired(cfqd, 0);
 		else if (sync && cfqq_empty &&
 			 !cfq_close_cooperator(cfqd, cfqq)) {
 			cfqd->noidle_tree_requires_idle |=
-- 
1.5.4.rc3

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