[Devel] Re: [PATCH v3 04/13] kmem accounting basic infrastructure

[Michal Hocko]

On Thu 27-09-12 10:46:05, Tejun Heo wrote:
[...]
> > > The part I nacked is enabling kmemcg on a populated cgroup and then
> > > starting accounting from then without any apparent indication that any
> > > past allocation hasn't been considered.  You end up with numbers which
> > > nobody can't tell what they really mean and there's no mechanism to
> > > guarantee any kind of ordering between populating the cgroup and
> > > configuring it and there's *no* way to find out what happened
> > > afterwards neither.  This is properly crazy and definitely deserves a
> > > nack.
> > > 
> > 
> > Mel suggestion of not allowing this to happen once the cgroup has tasks
> > takes care of this, and is something I thought of myself.
> 
> You mean Michal's?  It should also disallow switching if there are
> children cgroups, right?

Right.
 
-- 
Michal Hocko
SUSE Labs