On Mon, 18 Jul 2016, Vlastimil Babka wrote: > From: Hugh Dickins <hu...@google.com> > > At present MIGRATE_SYNC_LIGHT is allowing __isolate_lru_page() to > isolate a PageWriteback page, which __unmap_and_move() then rejects > with -EBUSY: of course the writeback might complete in between, but > that's not what we usually expect, so probably better not to isolate it. > > When tested by stress-highalloc from mmtests, this has reduced the number of > page migrate failures by 60-70%. > > Signed-off-by: Hugh Dickins <hu...@google.com> > Signed-off-by: Vlastimil Babka <vba...@suse.cz> > Acked-by: Michal Hocko <mho...@suse.com>
Acked-by: David Rientjes <rient...@google.com>
