linux-kernel - Re: [mm] [PATCH 4/4] Memory cgroup hierarchy feature selector

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Message-ID: <490D42C7.4000301@linux.vnet.ibm.com>
Date:	Sun, 02 Nov 2008 11:33:51 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	linux-mm@...ck.org, YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [mm] [PATCH 4/4] Memory cgroup hierarchy feature selector

KAMEZAWA Hiroyuki wrote:
> On Sun, 02 Nov 2008 00:19:02 +0530
> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> 
>> Don't enable multiple hierarchy support by default. This patch introduces
>> a features element that can be set to enable the nested depth hierarchy
>> feature. This feature can only be enabled when there is just one cgroup
>> (the root cgroup).
>>
> Why the flag is for the whole system ?
> flag-per-subtree is of no use ?

Flag per subtree might not be useful, since we charge all the way up to root,
which means that all subtrees have the root cgroup and hence the global flag.

Thanks for the comments,

-- 
	Balbir
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