linux-kernel - Re: IO controller discussion (Was: Re: [PATCH 01/10] Documentation)

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Date:	Tue, 21 Apr 2009 10:16:17 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrea Righi <righi.andrea@...il.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, dhaval@...ux.vnet.ibm.com,
	arozansk@...hat.com, jens.axboe@...cle.com,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	paolo.valente@...more.it, jmoyer@...hat.com,
	fernando@...ellilink.co.jp, oz-kernel@...hat.com,
	fchecconi@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, menage@...gle.com
Subject: Re: IO controller discussion (Was: Re: [PATCH 01/10] Documentation)

On Sun, 19 Apr 2009 17:53:59 +0200
Andrea Righi <righi.andrea@...il.com> wrote:
> > 
> > Got a question for you. Does memory controller already have the per cgroup
> > dirty pages limit? If no, has this been discussed in the past? if yes,
> > what was the conclsion?
> 

IMHO, dirty page handling and I/O throttling is a different problem.

 - A task (or cgroup) which makes the page dirty
 and
 - A task (or cgroup) to which a page is accounted

Is different from each other, in general.

I have a plan to add dirty_ratio to memcg, but it's for avoiding massive stavation in
memory reclaim, not for I/O control.

If you want to implement I/O throttle in MM layer, plz don't depend on memcg.
The perpose is different.

Thanks,
-Kame

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