Re: [PATCH REPOST RFC cgroup/for-3.7] cgroup: mark subsystems with broken hierarchy support and whine if cgroups are nested for them

Hello,

On Wed, Sep 12, 2012 at 05:47:45PM +0200, Michal Hocko wrote:

quoted

If it's absolutely necessary, I think it should be a root-only flag
(even if that ends up using the same code path).  Eventually, we
really want to kill .use_hierarchy, or at least make it to RO 1.  As
it's currently defined, it's just way too confusing.

Agreed on that, definitely.

The thing is that if we're gonna be headed that way, we're gonna have
to nudge people to .use_hierarchy = 1 everywher first.  If
.use_hierarchy = 0 at root is a valid use case which absolutedly needs
to be maintained (from what I read, I don't think it is), let's move
it to a different root-only flag; otherwise, it should be phased out.
As such, while the user might not be necessarily wrong, we still need
to unify the behavior, I think.

Thanks.

-- 
tejun