On 12.01.21 15:23, Michal Hocko wrote: > On Tue 12-01-21 13:16:45, Michal Hocko wrote: > [...] >> Well, currently pool pages are not migrateable but you are right that >> this is likely something that we will need to look into in the future >> and this optimization would stand in the way. > > After some more thinking I believe I was wrong in my last statement. > This optimization shouldn't have any effect on pages on the pool as > those stay at reference count 0 and they cannot be isolated either > (clear_page_huge_active before it is enqueued). > > That being said, the migration code would still have to learn about > about this pages but that is out of scope of this discussion. > > Sorry about the confusion from my side. > At this point I am fairly confused what's working at what's not :D I think this will require more thought, on how to teach alloc_contig_range() (and eventually in some cases offline_pages()?) to do the right thing. -- Thanks, David / dhildenb
