linux-kernel - Re: [RFC][2/3] Account and control virtual address space allocations

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Date:	Mon, 17 Mar 2008 11:03:49 +0800
From:	"Paul Menage" <menage@...gle.com>
To:	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][2/3] Account and control virtual address space allocations

On Mon, Mar 17, 2008 at 10:57 AM, Balbir Singh
<balbir@...ux.vnet.ibm.com> wrote:
>
>  1. We want to be able to support hierarchial accounting and control

>  2. We want to track usage of the root cgroup and report it back to the user

What use cases do you have for that?

>  3. We don't want to treat the root cgroup as a special case.

Why? It is a special case, in that in a lot of machines there's only
going to be the root cgroup, and the subsystem won't be mounted. So in
those cases, paying any overhead is a cost without a benefit.

Alternatively, how about you skip tracking virtual address space
changes if the virtual address cgroup isn't mounted on any hierarchy?
When you mount it, you can do a pass across all mms and set the root
cgroup usage to their total.

Paul
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