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SubjectRe: [PATCHSET cgroup/for-3.15] cgroup: implement unified hierarchy

On Mon, Apr 14, 2014 at 02:14:21PM -0400, Vivek Goyal wrote:
> So is this an intermediate mode before we move to single hiearchy *only*
> mode. AFAIK, you had mentioned that we will support legacy multiple
> hiearchy mode but single hiearchy is the new default mode.

Hmmm? It's a separate special hierarchy which can co-exist with other
hierarchies. There's no inherent intermediacy to it. As long as
traditional hierarchies exist, it's gonna be like this.

> How does one figure out which one is unified hiearchy (out of multiple
> hierarchies). Is there a flag somewhere? Or sane flag will be used to
> mark unified hiearchy.

You can tell it multiple ways - from its mount options, whether
cgroup.controllers exists, but it'll most likely be mounted on a
distinctive mount point, wouldn't it?

> So task and child groups can co-exist in root *only*?

Note that the restriction doesn't apply if no controller is enabled
but yes root is the only cgroup where tasks can exist and controllers
are enabled at the same time.



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