linux-kernel - Re: [PATCH 17/19] io-controller: Support per cgroup per device weights and io class

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Message-ID: <4A2F646A.8070403@cn.fujitsu.com>
Date:	Wed, 10 Jun 2009 15:44:42 +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 17/19] io-controller: Support per cgroup per device weights
 and io class

Vivek Goyal wrote:
...
>  
> @@ -1233,6 +1254,8 @@ struct io_group *io_group_chain_alloc(struct request_queue *q, void *key,
>  		elv_get_iog(iog);
>  
>  		iog->iocg_id = css_id(&iocg->css);
> +		io_group_init_entity(iocg, iog, iog->dev);

Hi Vivek,

A regression occurs in io.policy handling. IO Controller completely stops working when i use 
this interface. 
Make sure that we initialize entity after iog->dev is setting up properly.

Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
---
 block/elevator-fq.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/block/elevator-fq.c b/block/elevator-fq.c
index 6b30c36..a516dce 100644
--- a/block/elevator-fq.c
+++ b/block/elevator-fq.c
@@ -1451,7 +1451,6 @@ struct io_group *io_group_chain_alloc(struct request_queue *q, void *key,
 		elv_get_iog(iog);
 
 		iog->iocg_id = css_id(&iocg->css);
-		io_group_init_entity(iocg, iog, iog->dev);
 		iog->my_entity = &iog->entity;
 
 		if (bio) {
@@ -1459,6 +1458,8 @@ struct io_group *io_group_chain_alloc(struct request_queue *q, void *key,
 			iog->dev = MKDEV(disk->major, disk->first_minor);
 		}
 
+		io_group_init_entity(iocg, iog, iog->dev);
+
 		blk_init_request_list(&iog->rl);
 #ifdef CONFIG_DEBUG_GROUP_IOSCHED
 		io_group_path(iog, iog->path, sizeof(iog->path));
-- 
1.5.4.rc3

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