Hi Tejun, On Mon, Aug 15, 2022 at 2:17 PM Tejun Heo <tj@xxxxxxxxxx> wrote: > > On Fri, Jul 29, 2022 at 01:10:16PM -1000, Tejun Heo wrote: > > Every cgroup knows all its ancestors through its ->ancestor_ids[]. There's > > no advantage to remembering the IDs instead of the pointers directly and > > this makes the array useless for finding an actual ancestor cgroup forcing > > cgroup_ancestor() to iteratively walk up the hierarchy instead. Let's > > replace cgroup->ancestor_ids[] with ->ancestors[] and remove the walking-up > > from cgroup_ancestor(). > > > > While at it, improve comments around cgroup_root->cgrp_ancestor_storage. > > > > This patch shouldn't cause user-visible behavior differences. > > > > v2: Update cgroup_ancestor() to use ->ancestors[]. > > > > v3: cgroup_root->cgrp_ancestor_storage's type is updated to match > > cgroup->ancestors[]. Better comments. > > > > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > > Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx> > > Applied to cgroup/for-6.1. I've realized that perf stat change needs backward compatibility. Will send a fix soon. Thanks, Namhyung
