linux-kernel - Re: [PATCH 4/7] bio-cgroup: Split the cgroup memory subsystem into two parts

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Message-Id: <20080819.214635.70071441.taka@valinux.co.jp>
Date:	Tue, 19 Aug 2008 21:46:35 +0900 (JST)
From:	Hirokazu Takahashi <taka@...inux.co.jp>
To:	balbir@...ux.vnet.ibm.com
Cc:	ryov@...inux.co.jp, kamezawa.hiroyu@...fujitsu.com,
	xen-devel@...ts.xensource.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, dm-devel@...hat.com,
	agk@...rceware.org, xemul@...nvz.org, fernando@....ntt.co.jp
Subject: Re: [PATCH 4/7] bio-cgroup: Split the cgroup memory subsystem into
 two parts

Hi,

> >> I'm now writing remove-lock-page-cgroup patches. it works well.
> >> please wait for a while...
> > 
> > I'm looking forward to those patches.
> > 
> > By the way, I'm glad if memory-cgroup has a feature which can make a
> > page_cgroup move between cgroups with small overhead. It makes
> > bio-cgroup improve the accuracy of tracking down pages.
> 
> Page movement can be a very expensive operation and is proportional to the size
> of the control group. I think movement should be an optional feature, if we ever
> add it.

Yes, we should avoid moving pages as far as it is balanced fairly well
between groups.

But I want to move pages between bio-cgoups in case it started charging
quite a few I/O requests to a wrong bio-cgroup. I think it will be okay
if pages moves between bio-cgroups, but they don't need to move between
memory cgroups. I know the latter is really heavy and the effect seems
to be so limited.

Thanks,
Hirokazu Takahashi.
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