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

[Tejun Heo]

Hello,

On Mon, Apr 14, 2014 at 11:45:56AM -0400, Vivek Goyal wrote:
> So this patchset does not *enforce* a single hierarchy? So user space
> can still mount other hierarchies.

Nope, nothing is forced.  Controllers may be moved between unified and
traditional multiple hierarchies.

> How does this work for root's tasks now? Given that task can only be
> in leaf cgroups, that means tasks can't be in / cgroup (If one wants
> to create some cgroups). Does that mean / will be empty and init system
> need to setup things right.

Root is exempt from the restriction.  Root has always been special
anyway.

I'll soon post a document describing the design and restrictions of
unified hierarchy along with an updated version of this patchset.

Thanks.

-- 
tejun