Comment # 60 on bug 1159882 from Michal Hocko

(In reply to Robert Delahunt from comment #59)
> Your most recent kernel with cgroup_disable=memory shows no swap usage when
> copying 16GB of data between drives.

Thanks! Do you happen to use memory cgroups controller intentionally or it is
being used automagically? I suspect the later. As already mentioned earlier
(comment 12) the global memory pressure is spread over all existing memory
cgroups.

Anyway, your earlier tests suggested that cgroup_disable on its own didn't help
and we need to have the 2 patches reverted. I will mull over some more but I
unless Vlastimil or Mel oppose I will go ahead and revert both in 15sp2 and
openSUSE-15.2 branches. For a better experience with cgroups enabled I would
recommend using a most recent kernel (e.g. one from our stable repository).