linux-kernel - Re: [RFD] cgroup: about multiple hierarchies

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Message-ID: <20120223223832.GK22536@google.com>
Date:	Thu, 23 Feb 2012 14:38:32 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	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, Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFD] cgroup: about multiple hierarchies

Hello,

On Thu, Feb 23, 2012 at 02:41:10PM -0500, Vivek Goyal wrote:
> Considering everything internally as flat, isn't it simpler. So cgroup 
> tree still might look hierarchical but actually controller treats it
> as.
> 				root
> 		              / / | \ \
> 			    g1 g2 g3 g4 g5

I don't know.  Mixing the above with controllers which implement
proper nesting makes my head explode (why is there a hierarchy at
all?).  Root is always special anyway.  Just treating root differently
and collapsing the rest of hierarchies should do, right?

Thanks.

-- 
tejun
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