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

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Message-ID: <20091106073208.GA4992@balbir.in.ibm.com>
Date:	Fri, 6 Nov 2009 13:02:08 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Jan Safranek <jsafrane@...hat.com>
Cc:	Daniel Lezcano <daniel.lezcano@...e.fr>,
	libcg-devel <libcg-devel@...ts.sourceforge.net>,
	"menage@...gle.com" <menage@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	Bharata B Rao <bharata.rao@...ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Subject: Re: [RFC] Mount point suggestions for cgroup

* Jan Safranek <jsafrane@...hat.com> [2009-11-05 13:07:28]:

> On 11/04/2009 05:44 PM, Daniel Lezcano wrote:
> >Balbir Singh wrote:
> >>Hi, All,
> >>
> >>We've been having a discussion as to what would be the right place to
> >>mount the cgroup filesystem. Jan has been proactively looking into
> >>this. The FHS has no recommendation since cgroup filesystem came in
> >>much later.
> >>
> >>The options are
> >>
> >>1. /dev/cgroup
> >>2. /cgroup
> >>3. Some place under /sys
> >>
> >>The problem with (2) is that it is quite non-standard and pollutes the
> >>root directory. (3) requires some basic support to create a directory
> >>for cgroup under /sys. (1) seems the most obvious choice since cpusets
> >>were mounted under /dev/cpuset, but /dev is controlled by udev.
> >>
> >>Given the three choices or any other suggestions, is there a general
> >>preference as to where we can mount it? The goal is to standardize
> >>the mount point (if possible).
> >Why the mount point has to be standardized ?
> >
> 
> The mount point does not need to be set into stone so everybody
> *must* use it. I, as Fedora packager, just need some default place
> where to mount it, so applications which need to create/manage
> groups work without any (potentially dumb) user assistance. 

I see no consensus, there are different approaches people like. I
wonder if we can create an empty directory under /sys/kernel/cgroup,
if so we would have supported the /sys approach. I'll send out a patch
to do the same.


Of
> course, advanced admin can change the settings and move the groups
> anywhere, applications still need to parse /proc/mounts or use
> appropriate library like libcgroup.

Agreed.

-- 
	Balbir
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