linux-kernel - Re: [RFC][0/3] Virtual address space control for cgroups

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Message-ID: <47DDCDA7.4020108@cn.fujitsu.com>
Date:	Mon, 17 Mar 2008 10:47:19 +0900
From:	Li Zefan <lizf@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
CC:	Balbir Singh <balbir@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][0/3] Virtual address space control for cgroups

Paul Menage wrote:
> On Mon, Mar 17, 2008 at 1:29 AM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>> This is an early patchset for virtual address space control for cgroups.
>>  The patches are against 2.6.25-rc5-mm1 and have been tested on top of
>>  User Mode Linux.
> 
> What's the performance hit of doing these accounting checks on every
> mmap/munmap? If it's not totally lost in the noise, couldn't it be
> made a separate control group, so that it could be just enabled (and
> the performance hit taken) for users that actually want it?
> 

It will be code duplication to make it a new subsystem, and it will be useful
to control both of them, am I right? :)

So could we just add a CONFIG to this patch series, like:
	CONFIG_CGROUP_MEM_RES_AS_CTLR
?

> Paul
> 
> 
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