On 2/22/21 12:41 AM, Michal Hocko wrote:

quoted

Ah, that's true.  The added check for soft_limit_excess is not needed.

Do you think it is still a good idea to add patch 3 to
restrict the uncharge update in page batch of the same node and cgroup?

I would rather drop it. The less the soft limit reclaim code is spread
around the better.

Let's drop patch 3 then.  I find patch 2 is the most critical one in this series.  
Without that patch some cgroups exceeds the soft limit excess very badly.

Tim