On Wed, Oct 09, 2024 at 05:35:50PM -0700, Shakeel Butt wrote: > The memcg stats are maintained in rstat infrastructure which provides > very fast updates side and reasonable read side. However memcg added > plethora of stats and made the read side, which is cgroup rstat flush, > very slow. To solve that, threshold was added in the memcg stats read > side i.e. no need to flush the stats if updates are within the > threshold. > > This threshold based improvement worked for sometime but more stats were > added to memcg and also the read codepath was getting triggered in the > performance sensitive paths which made threshold based ratelimiting > ineffective. We need more visibility into the hot and cold stats i.e. > stats with a lot of updates. Let's add trace to get that visibility. > > Signed-off-by: Shakeel Butt <shakeel.butt@xxxxxxxxx> Acked-by: Roman Gushchin <roman.gushchin@xxxxxxxxx> Thanks!
