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

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Date:	Mon, 26 Jul 2010 14:28:58 -0700
From:	Greg KH <gregkh@...e.de>
To:	Dhaval Giani <dhaval.giani@...il.com>
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
Subject: Re: [PATCH] cgroupfs: create /sys/fs/cgroup to mount cgroupfs on

On Mon, Jul 26, 2010 at 11:13:14AM +0200, Dhaval Giani wrote:
> On Mon, Jul 26, 2010 at 11:12 AM, Kay Sievers <kay.sievers@...y.org> wrote:
> > On Mon, Jul 26, 2010 at 11:08, Dhaval Giani <dhaval.lists@...gianis.in> wrote:
> >> On Thu, Jul 22, 2010 at 8:36 PM, Greg KH <gregkh@...e.de> wrote:
> >>> On Thu, Jul 22, 2010 at 11:31:07AM -0700, Paul Menage wrote:
> >>>> On Thu, Jul 22, 2010 at 11:26 AM, Greg KH <gregkh@...e.de> wrote:
> >>>> > We really shouldn't be asking userspace to create new root filesystems.
> >>>> > So follow along with all of the other in-kernel filesystems, and provide
> >>>> > a mount point in sysfs.
> >>>> >
> >>>> > For cgroupfs, this should be in /sys/fs/cgroup/  This change provides
> >>>> > that mount point when the cgroup filesystem is registered in the kernel.
> >>>>
> >>>> But cgroups will typically have multiple mounts, with different
> >>>> resource controllers/options on each mount. That doesn't really fit in
> >>>> with this scheme.
> >>>
> >>> Really?  I see systems mounting it at /cgroups/ in the filesystem today.
> >>> Where are you expecting it to be mounted at?
> >>>
> >>
> >> Not really. It is getting mounted at /cgroups/<name of resource
> >> controller>/ at a number of places. Keeping it in sysfs loses us a lot
> >> of this flexibility. Unless you are ready to keep adding a new
> >> mountpoint for each subsystem, it will not really work out in the long
> >> term.
> >
> > As mentioned earlier in this thread, systemd already mounts a tmpfs at
> > the cgroup mountpoint. We need only a single directory. This should
> > not be an issue.
> >
> 
> Ah ok. I am catching up with email after over 3 weeks :-). Missed all
> this discussion. My apologies!

Ok, again, after all of this, who is going to be applying this patch to
their tree for the .36 merge window?

Or should I apply it to my driver-core one?

thanks,

greg k-h
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