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

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Message-ID: <AANLkTinFQtwrCC82T9KlKskDV8fn-zYgimyH2wguHkqY@mail.gmail.com>
Date:	Fri, 23 Jul 2010 01:08:12 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Greg KH <gregkh@...e.de>
Cc:	Vivek Goyal <vgoyal@...hat.com>, 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 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.

I guess that covers all needs expressed here, and we are happy to
switch systemd over from /cgroup to /sys/fs/cgroup as soon as the
kernel carries the patch.

Thanks,
Kay
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