On Tue 03-04-18 13:46:28, Naoya Horiguchi wrote: > My testing for the latest kernel supporting thp migration found out an > infinite loop in offlining the memory block that is filled with shmem > thps. We can get out of the loop with a signal, but kernel should > return with failure in this case. > > What happens in the loop is that scan_movable_pages() repeats returning > the same pfn without any progress. That's because page migration always > fails for shmem thps.
Why does it fail? Shmem pages should be movable without any issues. -- Michal Hocko SUSE Labs
