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

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Message-ID: <6599ad830803161626q1fcf261bta52933bb5e7a6bdd@mail.gmail.com>
Date:	Mon, 17 Mar 2008 07:26:22 +0800
From:	"Paul Menage" <menage@...gle.com>
To:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, "Hugh Dickins" <hugh@...itas.com>,
	"Sudhir Kumar" <skumar@...ux.vnet.ibm.com>,
	"YAMAMOTO Takashi" <yamamoto@...inux.co.jp>, lizf@...fujitsu.com,
	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

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?

Paul
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