Quoting Tejun Heo (tj@xxxxxxxxxx):
> Hello, Serge.
>
> On Tue, Aug 09, 2016 at 10:33:05AM -0500, Serge E. Hallyn wrote:
> > > + for (i = depth_to - 1; i >= 0; i--) {
> > > + for (kn = kn_to, j = 0; j < i; j++)
> > > + kn = kn->parent;
> >
> > This is O(n^2) where n is the path depth. It's not a hot path, though, do
> > we care?
>
> I don't think it matters. It's a slow path and cgroup hierarchies
> aren't supposed to be super deep to begin with. If it ever does, we
> can replace the cgroup->ancestor_ids[] array with ancestor pointer
> array and walk that instead.
>
> Thanks.
Ok, thanks
Acked-by: Serge Hallyn <serge@xxxxxxxxxx>
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