On Mon, 18 Jul 2016, Vlastimil Babka wrote: > From: Hugh Dickins <[email protected]> > > 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 <[email protected]> > Signed-off-by: Vlastimil Babka <[email protected]> > Acked-by: Michal Hocko <[email protected]>
Acked-by: David Rientjes <[email protected]>
