linux-kernel - Re: [PATCH 19/23] io-controller: map async requests to appropriate cgroup

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Message-ID: <4A9C0AEB.6000506@redhat.com>
Date:	Mon, 31 Aug 2009 13:39:55 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	containers@...ts.linux-foundation.org, dm-devel@...hat.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, guijianfeng@...fujitsu.com, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, agk@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org,
	jmarchan@...hat.com, torvalds@...ux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH 19/23] io-controller: map async requests to appropriate
 cgroup

Vivek Goyal wrote:
> o So far we were assuming that a bio/rq belongs to the task who is submitting
>   it. It did not hold good in case of async writes. This patch makes use of
>   blkio_cgroup pataches to attribute the aysnc writes to right group instead
>   of task submitting the bio.
> 
> o For sync requests, we continue to assume that io belongs to the task
>   submitting it. Only in case of async requests, we make use of io tracking
>   patches to track the owner cgroup.
> 
> o So far cfq always caches the async queue pointer. With async requests now
>   not necessarily being tied to submitting task io context, caching the
>   pointer will not help for async queues. This patch introduces a new config
>   option CONFIG_TRACK_ASYNC_CONTEXT. If this option is not set, cfq retains
>   old behavior where async queue pointer is cached in task context. If it
>   is set, async queue pointer is not cached and we take help of bio
>   tracking patches to determine group bio belongs to and then map it to
>   async queue of that group.
> 
> Signed-off-by: Nauman Rafique <nauman@...gle.com>
> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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