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From: Ben Gamari <bgamari@gmail.com>
To: Li Zefan <lizf@cn.fujitsu.com>
Cc: Paul Menage <menage@google.com>, containers@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, libcg-devel@lists.sourceforge.net
Subject: Re: Mounting blkio cgroup hierarchy
In-Reply-To: <4CE083A4.4030206@cn.fujitsu.com>
References: <87fwv6sbwr.fsf@gmail.com> <4CE083A4.4030206@cn.fujitsu.com>
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Date: Sun, 14 Nov 2010 20:17:39 -0500
Message-ID: <87eiancrm4.fsf@gmail.com>
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On Mon, 15 Nov 2010 08:49:40 +0800, Li Zefan <lizf@cn.fujitsu.com> wrote:
> Ben Gamari wrote:
> > I've been trying to configure cgroups and have encountered some very
> > strange behavior. In particular, when I follow the instructions in
> > Documentation/cgroups/blkio-controller.txt I quickly reach an error,
> > 
> > $ cd /mnt
> > $ sudo mkdir -p cgroups/blkio
> > $ # Confirm it's not already mounted:
> > $ cat /proc/mounts
> > $ sudo mount -t cgroup -o blkio none /mnt/cgroups/blkio
> ...
> > mount: special device none does not exist
> > 
> > I've done quite a bit of Googling and yet it's very difficult to find
> > good information on configuring cgroups. I would use the libcg
> > toolset[1] but every attempt to configure it has ended in frustratingly
> > vague error messages.
> > 
> > Any ideas?
> > 
> 
> I suspect you didn't have blkio enabled in your kernel config.
> 
Doh! I could have sworn I had enabled this. Sorry for the noise!

- Ben
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