The fatal livelock in kswapd, reported in this thread: http://marc.info/?t=130392066000001 Is mitigateable if we prevent the cgroups code being so aggressive in its zone shrinking (by reducing it's default shrink from 0 [everything] to DEF_PRIORITY [some things]). This will have an obvious knock on effect to cgroup accounting, but it's better than hanging systems. Signed-off-by: James Bottomley <James.Bottomley@xxxxxxx> --- >From 74b62fc417f07e1411d98181631e4e097c8e3e68 Mon Sep 17 00:00:00 2001 From: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> Date: Mon, 2 May 2011 14:56:29 -0500 Subject: [PATCH] vmscan: move containers scan back to default priority diff --git a/mm/vmscan.c b/mm/vmscan.c index f6b435c..46cde92 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2173,8 +2173,12 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem, * if we don't reclaim here, the shrink_zone from balance_pgdat * will pick up pages from other mem cgroup's as well. We hack * the priority and make it zero. + * + * FIXME: jejb: zero here was causing a livelock in the + * shrinker so changed to DEF_PRIORITY to fix this. Now need to + * sort out cgroup accounting. */ - shrink_zone(0, zone, &sc); + shrink_zone(DEF_PRIORITY, zone, &sc); trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed); -- 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>