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

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Message-ID: <1331659537.18960.84.camel@twins>
Date:	Tue, 13 Mar 2012 18:25:37 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>, 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, Michal Schmidt <mschmidt@...hat.com>
Subject: Re: [RFD] cgroup: about multiple hierarchies

On Tue, 2012-03-13 at 10:10 -0400, Vivek Goyal wrote:
> Implementing hierarchy is a pain and is expensive at run time. 

Yeah, suck it up :-)

I would really rather we mandate one implementation standard for
controllers for the sake of consistency and uniformity. A direct result
of doing away with the multiple hierarchy crap is that all controllers
are co-mounted. Allowing differences like this just doesn't make any
sense.

So either we drop full hierarchy support from all controllers or we
deprecate and remove all non-hierarchical controllers.

I'm fine with either, but I'm not fine with with the half-arsed
solutions proposed here.
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