On Wed, Jan 19, 2022 at 04:15:34PM -0800, Ivan Babrou wrote: > Hello, > > We've seen a significant perf degradation when reading a tmpfs file > swapped into zram between 5.10 and 5.15. The source of the issue is: > > * aa48e47e3906: memcg: infrastructure to flush memcg stats > > There's a couple of commits that helps to bridge the gap in 5.16: > > * 11192d9c124d: memcg: flush stats only if updated > * fd25a9e0e23b: memcg: unify memcg stat flushing > > Both of these apply cleanly and Shakeel (the author) has okayed the > backport from his end. He also suggested backporting the following: > > * 5b3be698a872: memcg: better bounds on the memcg stats updates > > I personally did not test this one, but it applies cleanly, so there's > probably no harm. I cc'd Shakeel in case you want confirmation on > that. It's not a part of any tag yet. > > Please backport all three (or at least the first two) to 5.15 LTS. All now queued up, thanks! greg k-h
