On Mon, May 16, 2011 at 07:58:01AM +0900, Minchan Kim wrote: > On Mon, May 16, 2011 at 12:59 AM, Andrew Lutomirski <luto@xxxxxxx> wrote: > > I have no clue, but this patch (from Minchan, whitespace-damaged) seems to help: > > > > diff --git a/mm/vmscan.c b/mm/vmscan.c > > index f6b435c..4d24828 100644 > > --- a/mm/vmscan.c > > +++ b/mm/vmscan.c > > @@ -2251,6 +2251,10 @@ static bool sleeping_prematurely(pg_data_t > > *pgdat, int order, long remaining, > > unsigned long balanced = 0; > > bool all_zones_ok = true; > > > > + /* If kswapd has been running too long, just sleep */ > > + if (need_resched()) > > + return false; > > + > > /* If a direct reclaimer woke kswapd within HZ/10, it's premature */ > > if (remaining) > > return true; > > @@ -2286,7 +2290,7 @@ static bool sleeping_prematurely(pg_data_t > > *pgdat, int order, long remaining, > > * must be balanced > > */ > > if (order) > > - return pgdat_balanced(pgdat, balanced, classzone_idx); > > + return !pgdat_balanced(pgdat, balanced, classzone_idx); > > else > > return !all_zones_ok; > > } > > > > I haven't tested it very thoroughly, but it's survived much longer > > than an unpatched kernel probably would have under moderate use. > > > > I have no idea what the patch does :) > > The reason I sent this is that I think your problem is similar to > recent Jame's one. > https://lkml.org/lkml/2011/4/27/361 > > What the patch does is [1] fix of "wrong pgdat_balanced return value" > bug and [2] fix of "infinite kswapd bug of non-preemption kernel" on > high-order page. > If it turns out the patch works (which is patches 1 and 4 from the series related to James) for more than one tester, I'll push it separately and drop the SLUB changes. -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>