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Date:	Thu, 23 Feb 2012 16:22:26 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFD] cgroup: about multiple hierarchies

> The following is a "best practices" document on using cgroups.
> 
>   http://www.freedesktop.org/wiki/Software/systemd/PaxControlGroups
> 
> To me, it seems to demonstrate the rather ugly situation that the
> current cgroup is providing.  Everyone should tip-toe around cgroup
> hierarchies and nobody has full knowledge or control over them.
> e.g. base system management (e.g. systemd) can't use freezer or task
> counter as someone else might want to use it for different hierarchy
> layout.
> 

This issue still exists if we allow a single hierarchy only, right?
Different cgroup users/applications have to struggle not to step
on each other's toe.
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