linux-kernel - [PATCH] IO-Controller: clear ioq wait flag if a request goes into that ioq

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Message-ID: <4A8CAAE2.1030804@cn.fujitsu.com>
Date:	Thu, 20 Aug 2009 09:46:10 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	jens.axboe@...cle.com, ryov@...inux.co.jp,
	balbir@...ux.vnet.ibm.com, righi.andrea@...il.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp,
	jmoyer@...hat.com, dhaval@...ux.vnet.ibm.com,
	m-ikeda@...jp.nec.com, agk@...hat.com, akpm@...ux-foundation.org,
	peterz@...radead.org, jmarchan@...hat.com
Subject: [PATCH] IO-Controller: clear ioq wait flag if a request goes into
 that ioq

Vivek Goyal wrote:
...
>  		/*
>  		 * Remember that we saw a request from this process, but
> @@ -1940,7 +2013,7 @@ void elv_ioq_request_add(struct request_queue *q, struct request *rq)
>  		 * has other work pending, don't risk delaying until the
>  		 * idle timer unplug to continue working.
>  		 */
> -		if (elv_ioq_wait_request(ioq)) {
> +		if (group_wait || elv_ioq_wait_request(ioq)) {

Hi Vivek,

I guess we need to clear ioq_wait_request flags if there are requests to 
go in this ioq. Otherwise, once waitting request on ioq, it will go into
this path every time when a request is enqueued.

Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
---
 block/elevator-fq.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/block/elevator-fq.c b/block/elevator-fq.c
index b3c387d..201543e 100644
--- a/block/elevator-fq.c
+++ b/block/elevator-fq.c
@@ -2708,6 +2708,9 @@ void elv_ioq_request_add(struct request_queue *q, struct request *rq)
 				__blk_run_queue(q);
 			else
 				elv_mark_ioq_must_dispatch(ioq);
+
+			if (elv_ioq_wait_request(ioq))
+				elv_clear_ioq_wait_request(ioq);
 		}
 	} else if (elv_should_preempt(q, ioq, rq)) {
 		/*
-- 
1.5.4.rc3

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