On Tue 16-02-21 09:13:09, David Hildenbrand wrote:

On 15.02.21 20:02, Michal Hocko wrote:

quoted

Would it be feasible to reused parts of the freed page in
the worst case?

As already discussed, this is only possible when the huge page does not
reside on ZONE_MOVABLE/CMA.

Right. But usually this is not the case so it would be at least
something.

In addition, we can no longer form a huge page at that memory location ever.

Yes, that's why I am saying in the worst case. E.g. when dissolving is
really necessary like in hwpoison case.

Maybe we are really far from needing something like that. I just wanted
to mention this option and I was not aware this has been discussed
previously.
-- 
Michal Hocko
SUSE Labs