linux-kernel - Re: [RFC][mm] [PATCH 4/4] Memory cgroup hierarchy feature selector (v2)

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Date:	Tue, 11 Nov 2008 10:31:00 +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: [RFC][mm] [PATCH 4/4] Memory cgroup hierarchy feature selector
 (v2)

KAMEZAWA Hiroyuki wrote:
> On Sat, 08 Nov 2008 14:41:13 +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 the cgroup for which the
>> feature this is enabled, has no children.
>>
>> Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
>> ---
>>
> IMHO, permission to this is not enough.
> 
> I think following is sane way.
> ==
>    When parent->use_hierarchy==1.
> 	my->use_hierarchy must be "1" and cannot be tunrned to be "0" even if no children.
>    When parent->use_hierarchy==0
> 	my->use_hierarchy can be either of "0" or "1".
> 	this value can be chagned if we don't have children
> ==

Sounds reasonable, will fix in v3.

-- 
	Balbir
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