[Devel] Re: Mounting blkio cgroup hierarchy

[Ben Gamari]

On Mon, 15 Nov 2010 08:49:40 +0800, Li Zefan <lizf at 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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