linux-kernel - Re: [PATCH] Add hierarchical accounting to cpu accounting controller

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Message-ID: <49111394.1070304@cn.fujitsu.com>
Date:	Wed, 05 Nov 2008 11:31:32 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
CC:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	bharata@...ux.vnet.ibm.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] Add hierarchical accounting to cpu accounting	controller

>> cpuacct was designed to count cpu usage of a group of tasks, and now some people
>> want it to also take child group's usage into account, so I think this is a feature
>> request but not a bug fix.
>>
> 
> I disagree. The child is a part of the parent's hierarchy, and therefore
> its usage should reflect in the parent's usage.
> 

In memcg the child's usage doesn't reflect in its parent's usage. ;)

Balbir just posted a patchset to add hierarchy support in memcg, and added memory.feature
to disable/enable this feature. Is it for performance only or also for keeping the user
interface/behavior unchanged?
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