https://bugzilla.suse.com/show_bug.cgi?id=1159882 https://bugzilla.suse.com/show_bug.cgi?id=1159882#c72 --- Comment #72 from Michal Hocko <mhocko@suse.com> --- (In reply to Robert Delahunt from comment #71)

My latest test monitoring /sys/fs/cgroup/memory was with the OpenSUSE LEAP 15.2 stock (update) kernel (see uname -a in previous post).

OK, that explains it, I guess. Please stick with the test kernel so that we can actually draw any conclusion here. So far I believe that the two identified patches have made swapping much more probable under stream IO. Upstream kernel behaves differently because of later changes. The state we have in 15.2 kernels is half baked and therefore I would rather like to restore the previous behavior. For that I would like to see confirmed that a) test kernel (the latest one) doesn't swap under your streaming IO load without cgroups (cgroup_disable=memory) and that this is the case consistently in several runs b) the same tested _without_ cgroup_disable=memory parameter - aka cgroups enabled by default (check the cgroup hierarchy find /sys/fs/cgroup/memory -type d) in both cases collect /prov/vmstat as before -- You are receiving this mail because: You are on the CC list for the bug.