On 10/14/19 3:14 PM, Andrew Morton wrote: > On Mon, 14 Oct 2019 20:31:07 +0200 Michal Hocko <mhocko@xxxxxxxxxx> wrote: > >> Please put all that to the changelog. It would be also great to see >> whether that really scales with the number of cgroups if that is easy to >> check with your benchmark. > > I restored this, with some changelog additions. > > Tim, please send along any updates you'd like to make to this, along > with tested-by, acked-by, etc. > > I added the Fixes: tag. Do we think this is serious enough to warrant > backporting into -stable trees? I suspect so, as any older-tree > maintainer who spies this change will say "hell yeah". Johannes' changes that introduced the sum over all percpu counters in lruvec_lru_size only got merged recently in 5.2. I tested 5.1 kernel and it does not have this particular scalability issue. So backport is only needed for 5.2 stable. Feel free to add Acked-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx> Tested-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx> Thanks. Tim
