linux-kernel - Re: [RFC PATCH 1/2] New cgroup subsystem API (->initialize())

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Message-ID: <49A65854.3040505@cn.fujitsu.com>
Date:	Thu, 26 Feb 2009 16:52:36 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
CC:	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Balaji Rao <balajirrao@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC PATCH 1/2] New cgroup subsystem API (->initialize())

> I believe hierarchical accounting is natural. Since the CPU controller
> divides its bandwidth as per hierarchy, it makes sense for the
> accounting to also be hierarchical. I guess this is a reasonable
> compromise. But how do you still check if the group you are accounting
> for is the root group or not? (Unless I am missing something obvious)
> 

As easy as: if (cgrp->parent == NULL) or if (cgrp == cgrp->top_cgroup)

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