+Andrew & linux-mm On Thu, Jan 27, 2022 at 7:30 AM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > 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! Thanks Greg. Adding Andrew (and linux-mm) in CC to let him know the reason for backporting these patches to 5.15 stable tree. > > greg k-h
