linux-kernel - Re: [PATCH 03/24] io-controller: Common flat fair queuing code in elevaotor layer

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Date:	Wed, 19 Aug 2009 11:36:22 +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: Re: [PATCH 03/24] io-controller: Common flat fair queuing code in
 elevaotor layer

Vivek Goyal wrote:
...

> +
> +static void elv_preempt_queue(struct request_queue *q, struct io_queue *ioq)
> +{
> +	elv_log_ioq(q->elevator->efqd, ioq, "preempt");
> +	elv_slice_expired(q);
> +
> +	/*
> +	 * Put the new queue at the front of the of the current list,
> +	 * so we know that it will be selected next.
> +	 */
> +
> +	requeue_ioq(ioq);
> +	ioq->slice_start = ioq->slice_end = 0;

I think this assignment is redundant because these two members will be reset
when this ioq is scheduled.

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

diff --git a/block/elevator-fq.c b/block/elevator-fq.c
index d04e925..b3c387d 100644
--- a/block/elevator-fq.c
+++ b/block/elevator-fq.c
@@ -2650,7 +2650,6 @@ static void elv_preempt_queue(struct request_queue *q, struct io_queue *ioq)
 		 */
 
 		requeue_ioq(ioq);
-		ioq->slice_start = ioq->slice_end = 0;
 		elv_mark_ioq_slice_new(ioq);
 	}
 }
-- 
1.5.4.rc3



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