linux-kernel - Re: [RFC] Prefixing cgroup generic control filenames with "cgroup."

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Message-ID: <20080228213319.GC1232@vino.hallyn.com>
Date:	Thu, 28 Feb 2008 15:33:19 -0600
From:	serge@...lyn.com
To:	Paul Menage <menage@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
	balbir@...ux.vnet.ibm.com, a.p.zijlstra@...llo.nl,
	xemul@...nvz.org, pj@....com
Subject: Re: [RFC] Prefixing cgroup generic control filenames with "cgroup."

Quoting Paul Menage (menage@...gle.com):
> On Thu, Feb 28, 2008 at 1:21 PM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> 
> >
> >  Because if something is in /foo/bar/cgroup/notify_on_release then
> >  prefixing the filename with "cgroup_" seems pretty pointless.
> >
> 
> The point would be to avoid situations where a user has code that
> creates a group directory called "foo", and then in a future kernel
> release cgroups introduces a control file called "foo". If it's
> prefixed, then the user just has to avoid creating groups prefixed by
> "cgroup." or any subsystem name, so collisions will be less likely.

Have you already run into that case?

You said the set of files belong to cgroup itself is likely to increase
- do you have some candidates in mind?  Perhaps ones which are likely
to conflict with choice taskgroup names?

If anything I'd say add a 'prefix_cgroup' mount option and use it to
decide whether to prefix or not (rather than use the noprefix option).

-serge
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