linux-kernel - Re: [PATCH 04/19] io-controller: Modify cfq to make use of flat elevator fair queuing

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Message-ID: <4A30A05C.4060703@cn.fujitsu.com>
Date:	Thu, 11 Jun 2009 14:12:44 +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, nauman@...gle.com, dpshah@...gle.com,
	lizf@...fujitsu.com, mikew@...gle.com, fchecconi@...il.com,
	paolo.valente@...more.it, ryov@...inux.co.jp,
	fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp,
	jmoyer@...hat.com, dhaval@...ux.vnet.ibm.com,
	balbir@...ux.vnet.ibm.com, righi.andrea@...il.com,
	m-ikeda@...jp.nec.com, jbaron@...hat.com, agk@...hat.com,
	snitzer@...hat.com, akpm@...ux-foundation.org, peterz@...radead.org
Subject: Re: [PATCH 04/19] io-controller: Modify cfq to make use of flat elevator
 fair queuing

Vivek Goyal wrote:
> This patch changes cfq to use fair queuing code from elevator layer.
> 

last_end_request in cic is of no use anymore. Get rid of it.

Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
---
 block/cfq-iosched.c       |    4 ----
 include/linux/iocontext.h |    1 -
 2 files changed, 0 insertions(+), 5 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 5871568..705e7ba 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1170,7 +1170,6 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
 	cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask | __GFP_ZERO,
 							q->node);
 	if (cic) {
-		cic->last_end_request = jiffies;
 		INIT_LIST_HEAD(&cic->queue_list);
 		INIT_HLIST_NODE(&cic->cic_list);
 		cic->dtor = cfq_free_io_context;
@@ -1794,9 +1793,6 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
 
 	if (!cfq_class_idle(cfqq))
 		cfqd->last_end_request = now;
-
-	if (sync)
-		RQ_CIC(rq)->last_end_request = now;
 }
 
 /*
diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index 1fe9d78..9c4587b 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -39,7 +39,6 @@ struct cfq_io_context {
 
 	struct io_context *ioc;
 
-	unsigned long last_end_request;
 	sector_t last_request_pos;
 
 	unsigned int seek_samples;
-- 
1.5.4.rc3


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