Hello Shakeel. (Sorry for taking so long getting down to this.) On Fri, Oct 01, 2021 at 12:00:40PM -0700, Shakeel Butt <shakeelb@xxxxxxxxxx> wrote: > There is no need for that. We just need one flusher and everyone else > can benefit. I imagine a cgroup with an intricate deep hiearchy with many updates and a separate (simpler) sibling/independent cgroup that would need to pay the costs of the first hierarchy updates [1] when it asks just for its own stats (bound by the amount that's leftover from the periodic updates). The stats files (or wb stats) are likely not that time sensitive and the reclaim (that can be local only but is slow path anyway) already uses the global flushing. I wonder whether the bigger benefit would be to retain the global stats_flush_threshold counter but flush only local subtree. Thanks, Michal [1] At first I thought non-memcg updates would interfere too via rstat tree but I see it's actually filtered with the stats_flush_threshold so only foreign memcg updates are relevant.
