On Wed, Mar 31, 2021 at 6:20 AM Mel Gorman <mgorman@xxxxxxx> wrote: > > On Tue, Mar 30, 2021 at 04:42:00PM +0200, Gerald Schaefer wrote: > > Could there be a work-around by splitting THP pages instead of marking them > > as migrate pmds (via pte swap entries), at least when THP migration is not > > supported? I guess it could also be acceptable if THP pages were simply not > > migrated for NUMA balancing on s390, but then we might need some extra config > > option to make that behavior explicit. > > > > The split is not done on other architectures simply because the loss > from splitting exceeded the gain of improved locality in too many cases. > However, it might be ok as an s390-specific workaround. > > (Note, I haven't read the rest of the series due to lack of time but this > query caught my eye). Will wait for your comments before I post v2. Thanks. > > -- > Mel Gorman > SUSE Labs
