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SubjectRe: [PATCHSET block/for-next] IO cost model based work-conserving porportional controller
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> Il giorno 14 giu 2019, alle ore 19:56, Tejun Heo <tj@kernel.org> ha scritto:
>
> On Thu, Jun 13, 2019 at 06:56:10PM -0700, Tejun Heo wrote:
> ...
>> The patchset is also available in the following git branch.
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-iow
>
> Updated patchset available in the following branch. Just build fixes
> and cosmetic changes for now.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-iow-v2
>

Hi Tejun,
I'm running the kernel in your tree above, in an Ubuntu 18.04.

After unmounting the v1 blkio controller that gets mounted at startup
I have created v2 root as follows

$ mount -t cgroup2 none /cgroup

Then I have:
$ ls /cgroup
cgroup.controllers cgroup.max.descendants cgroup.stat cgroup.threads io.weight.cost_model system.slice
cgroup.max.depth cgroup.procs cgroup.subtree_control init.scope io.weight.qos user.slice

But the following command gives no output:
$ cat /cgroup/io.weight.qos

And, above all,
$ echo 1 > /cgroup/io.weight.qos
bash: echo: write error: Invalid argument

No complain in the kernel log.

What am I doing wrong? How can I make the controller work?

Thanks,
Paolo

> Thanks.
>
> --
> tejun

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