On Mon, 18 Jul 2016, Vlastimil Babka wrote: > From: Hugh Dickins <hughd@xxxxxxxxxx> > > 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 <hughd@xxxxxxxxxx> > Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx> > Acked-by: Michal Hocko <mhocko@xxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>