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

[Tejun Heo]

Hello,

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