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

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Message-ID: <6599ad830802281703hb3cff06r8ba4755f705a0879@mail.gmail.com>
Date:	Thu, 28 Feb 2008 17:03:33 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	"Paul Jackson" <pj@....com>
Cc:	containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
	balbir@...ux.vnet.ibm.com, a.p.zijlstra@...llo.nl,
	xemul@...nvz.org, akpm@...ux-foundation.org
Subject: Re: [RFC] Prefixing cgroup generic control filenames with "cgroup."

On Thu, Feb 28, 2008 at 3:36 PM, Paul Jackson <pj@....com> wrote:
>
>  We could accomplish that much by decreeing that future new kernel
>  generated names that we might add follow some stronger convention,
>  such as the cgroup_ or appropriate subsystem prefix.

Subsystem-created files already have an appropriate prefix.

> No need to
>  change the existing well known names for this reason.

But that's part of my point - is it reasonable to describe a system
that was only introduced in 2.6.24 as "well-known"?

>
>    Actually, in terms of 'common names used
>  by humans' some of these names, "tasks" and "notify_on_release", date
>  back much earlier than that.  Please don't rename these two files in
>  cgroups; and of course absolutely don't rename them in cpusets.

No, I wasn't planning to make any changes to cpusets.

>
>  Please don't end up with different names of these files, depending on
>  whether you're in cgroups or cpusets, either.

That already happens - when mounted as the "cpuset" filesystem, we
have names like "mems_allowed". When mounted as cgroups, we have names
like cpuset.mems_allowed.

>
> > Could we do something like auto-prefixing user-created directories with a
>  > fixed string so that there is no way in which the user can cause a
>  > collision with kernel-created files?
>
>  Lordy lordy -- a bunch of intrusive, complicating crap to solve a
>  non-existent problem (sorry for the indelicate choice of words ;).

No, I don't like that idea either.

Paul
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