[Devel] Re: Mounting blkio cgroup hierarchy

[Li Zefan]

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.

So see if blkio is listed in /proc/cgroups or/and if CONFIG_BLK_CGROUP
is enabled in your kernel config.
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