On Mon, Mar 06, 2017 at 11:24:10AM -0500, Johannes Weiner wrote: > On Mon, Mar 06, 2017 at 10:37:40AM +0900, Minchan Kim wrote: > > On Fri, Mar 03, 2017 at 08:59:54AM +0100, Michal Hocko wrote: > > > On Fri 03-03-17 10:26:09, Minchan Kim wrote: > > > > On Tue, Feb 28, 2017 at 04:39:59PM -0500, Johannes Weiner wrote: > > > > > @@ -3316,6 +3325,9 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) > > > > > sc.priority--; > > > > > } while (sc.priority >= 1); > > > > > > > > > > + if (!sc.nr_reclaimed) > > > > > + pgdat->kswapd_failures++; > > > > > > > > sc.nr_reclaimed is reset to zero in above big loop's beginning so most of time, > > > > it pgdat->kswapd_failures is increased. > > That wasn't intentional; I didn't see the sc.nr_reclaimed reset. > > --- > > From e126db716926ff353b35f3a6205bd5853e01877b Mon Sep 17 00:00:00 2001 > From: Johannes Weiner <hannes@xxxxxxxxxxx> > Date: Mon, 6 Mar 2017 10:53:59 -0500 > Subject: [PATCH] mm: fix 100% CPU kswapd busyloop on unreclaimable nodes fix > > Check kswapd failure against the cumulative nr_reclaimed count, not > against the count from the lowest priority iteration. > > Suggested-by: Minchan Kim <minchan@xxxxxxxxxx> > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: Minchan Kim <minchan@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>
