linux-kernel - Re: [PATCH] cgroupfs: create /sys/fs/cgroup to mount cgroupfs on

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Message-ID: <20100723020714.GA11236@redhat.com>
Date:	Thu, 22 Jul 2010 22:07:15 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Kay Sievers <kay.sievers@...y.org>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Lennart Poettering <lennart@...ttering.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Ben Blum <bblum@...rew.cmu.edu>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	"Daniel P. Berrange" <berrange@...hat.com>,
	Jan Safranek <jsafrane@...hat.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [PATCH] cgroupfs: create /sys/fs/cgroup to mount cgroupfs on

On Thu, Jul 22, 2010 at 04:14:01PM -0700, Greg KH wrote:
> On Fri, Jul 23, 2010 at 01:08:12AM +0200, Kay Sievers wrote:
> > On Thu, Jul 22, 2010 at 23:18, Greg KH <gregkh@...e.de> wrote:
> > >> For my testing I now always use /cgroup/ and create directories under it
> > >> /cgroup/blkio /cgroup/cpu etc and mount controllers on respective
> > >> directories.
> > >
> > > Lennart and Kay, is this what systemd is doing?  I really don't think we
> > > should be adding a root /cgroup/ mount point to the system for something
> > > like this.
> > 
> > Already solved. Systemd always mounts an empty tmpfs at the 'cgroup'
> > mountpoint, and stuff is free to create subdirs there. Systemd itself
> > mount 'systemd' there.
> 
> Ah, that makes it easier.  Paul and Vivek, any objection to this patch
> going in now?
> 

This sounds reasonable to me also.

Jan, I know you have been working in this area and raised concenrs about
cgroup mount point in the past. Does it look good to you?

Vivek
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