linux-kernel - Re: [RFC] Mount point suggestions for cgroup

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Message-ID: <20091104161832.GJ3560@balbir.in.ibm.com>
Date:	Wed, 4 Nov 2009 21:48:32 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	containers@...ts.linux-foundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bharata B Rao <bharata.rao@...ibm.com>,
	libcg-devel <libcg-devel@...ts.sourceforge.net>,
	"menage@...gle.com" <menage@...gle.com>,
	Jan Safranek <jsafrane@...hat.com>
Subject: Re: [RFC] Mount point suggestions for cgroup

* Serge E. Hallyn <serue@...ibm.com> [2009-11-04 10:11:42]:

> Quoting Dave Hansen (dave@...ux.vnet.ibm.com):
> > On Wed, 2009-11-04 at 13:46 +0530, Balbir Singh wrote:
> > > The reason I liked /dev/cgroup was because cpusets could be
> > > mounted at /dev/cpuset or /dev/cgroup/cpuset. My concern with /cgroup
> > > is that a ls "/" now becomes larger in size. But I'll take your vote
> > > for it as +1 for /cgroup.
> > 
> > /dev/pts is a decent precedent for doing it under /dev, although it does
> > deal with actual devices.  cgroups do not.
> 
> Hmm, on whose behalf are you making this decision?
> 
> LSB people will want to avoid using /cgroup, but I think a lot of
> admins will likely prefer /cgroup (as I do).  On my systems I
> always use /cgroup, but would be more likely to use /mnt/cgroup
> over /dev/cgroup.
> 
> lxc (at lxc.sf.net) rightfully takes the cgroupfs from wherever it
> happens to be mounted.  Do you really need a mountpoint decided?
> 
> If you do, then while I DETEST the extra typing, I think
> /sys/kernel/cgroup makes most sense, since that's where you find
> debugfs and securityfs.
>

I would like to make this decision as a part of the tooling
development team for cgroups. So far we have

/cgroup +2
/sys    +1
/dev    +1

The concern with /sys/kernel/cgroup is that it would require creation
of sysfs directory that might not be backwards compatible way back to
2.6.24 when cgroups were first added. 

-- 
	Balbir
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