linux-kernel - Re: IO scheduler based IO controller V10

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Message-Id: <20090925.160911.71102299.ryov@valinux.co.jp>
Date:	Fri, 25 Sep 2009 16:09:11 +0900 (JST)
From:	Ryo Tsuruta <ryov@...inux.co.jp>
To:	balbir@...ux.vnet.ibm.com
Cc:	kamezawa.hiroyu@...fujitsu.com, akpm@...ux-foundation.org,
	vgoyal@...hat.com, 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, fernando@....ntt.co.jp,
	s-uchida@...jp.nec.com, taka@...inux.co.jp,
	guijianfeng@...fujitsu.com, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, righi.andrea@...il.com,
	m-ikeda@...jp.nec.com, agk@...hat.com, peterz@...radead.org,
	jmarchan@...hat.com, torvalds@...ux-foundation.org, mingo@...e.hu,
	riel@...hat.com
Subject: Re: IO scheduler based IO controller V10

Hi,

Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > > I think I must support dirty-ratio in memcg layer. But not yet.
> > 
> 
> We need to add this to the TODO list.
> 
> > OR...I'll add a bufferred-write-cgroup to track bufferred writebacks.
> > And add a control knob as
> >   bufferred_write.nr_dirty_thresh
> > to limit the number of dirty pages generetad via a cgroup.
> > 
> > Because memcg just records a owner of pages but not records who makes them
> > dirty, this may be better. Maybe I can reuse page_cgroup and Ryo's blockio
> > cgroup code.
> 
> Very good point, this is crucial for shared pages.
> 
> > 
> > But I'm not sure how I should treat I/Os generated out by kswapd.
> >
> 
> Account them to process 0 :)

How about accounting them to processes who make pages dirty? I think
that a process which consumes more memory should get penalty. However,
this allows a page request process to use other's bandwidth, but If
a user doesn't want to swap-out the memory, the user should allocate
enough memory for the process by using memcg in advance.

Thanks,
Ryo Tsuruta
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