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. -- tejun
