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Subject: Re: [RFD] cgroup: about multiple hierarchies
From: Mike Galbraith <efault@gmx.de>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Michal Schmidt <mschmidt@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>, Tejun Heo <tj@kernel.org>,
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        Kay Sievers <kay.sievers@vrfy.org>,
        Lennart Poettering <lennart@poettering.net>,
        Frederic Weisbecker <fweisbec@gmail.com>, linux-kernel@vger.kernel.org,
        Christoph Hellwig <hch@infradead.org>
Date: Thu, 01 Mar 2012 23:04:08 +0100
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On Thu, 2012-03-01 at 16:02 -0500, Vivek Goyal wrote: 
> On Thu, Mar 01, 2012 at 09:26:43PM +0100, Mike Galbraith wrote:

> > Q: you say systemd requires CONFIG_CGROUPS=y.  Why is that?  It's taking
> > over sysvinits job afaiui, what does that have to do with cgroups?
> 
> I think they were using it to track all the children forked by a service
> and cleanup all of them if need be. So they just need it for logical
> grouping functionality and don't require any controllers as such.

Hm.  Controllers are perhaps not required, but cpu controller was
configured and used without consent.  I didn't receive an offer.

-Mike