Re: [PATCH] mm: fix draining remote pageset

[Lameter, Christopher]

On Tue, 22 Aug 2023, Michal Hocko wrote:

> Yes, this doesn't really show any actual correctness problem so I do not
> think this is sufficient to change the code. You would need to show that
> the existing behavior is actively harmful.

Having some pages from a remote NUMA node stuck in a pcp somewhere is 
making that memory unusable. It is usually rate that these remote pages 
are needed again and so they may remain there for a long time if the 
situation is right.

And he is right that the intended behavior of freeing the remote pages 
has been disabled by the patch.

So I think there is sufficient rationale to apply these fixes.