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

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Message-ID: <20080228212835.GB1232@vino.hallyn.com>
Date:	Thu, 28 Feb 2008 15:28:35 -0600
From:	serge@...lyn.com
To:	Paul Menage <menage@...gle.com>
Cc:	Linux Containers <containers@...ts.osdl.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pavel Emelianov <xemul@...nvz.org>, Paul Jackson <pj@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] Prefixing cgroup generic control filenames with "cgroup."

Quoting Paul Menage (menage@...gle.com):
> All control files created by cgroup subsystems are given a prefix
> corresponding to their subsystem name. But control files provided by
> cgroups itself have no prefix. Currently that set of files is just
> "tasks", "notify_on_release" and "release_agent", but that set is
> likely to expand in the future. To reduce the risk of clashes, it
> would make sense to prefix these files and any future ones with the
> "cgroup." prefix.
> 
> The only reason that I can see *not* to do this would be for
> compatibility with 2.6.24. Do people think this is a strong enough
> reason to leave the existing names? If distros are planning to ship
> products based on 2.6.24, presumably they'd be adding their own
> patches anyway, so they could add a trivial prefix change patch too.
> (I realise this discussion would have been more useful *before* 2.6.24
> shipped, but I didn't quite get round to it ...)
> 
> A compromise might be to keep "tasks" unprefixed, and say that future
> names get the "cgroup." prefix; in this case I'd be inclined to add
> the prefix to notify_on_release and release_agent on the grounds that
> there's much less chance of breaking anyone with those files since (I
> suspect) they're much less used.
> 
> Note that if you mount a cgroup filesystem with the "noprefix" option,
> which is what the cpuset filesystem wrapper does, no subsystems have
> prefixes, and in this case the "cgroup." prefix wouldn't be used
> either. So this doesn't affect any users that explicitly mount cpusets
> rather than cgroups.
> 
> Thoughts?

To me it seems quite logical that files belonging to the cgroup
subsystem would have no prefix, and I don't see any good reason to
do so.

-serge
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