From: Christoph Lameter <clameter@engr.sgi.com>

Zone reclaim is usually only run on the local node.  Headless nodes do not
have any local processors.  This patch checks for headless nodes and
performs zone reclaim on them.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 mm/vmscan.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -puN mm/vmscan.c~zone_reclaim-reclaim-on-memory-only-node-support mm/vmscan.c
--- 25/mm/vmscan.c~zone_reclaim-reclaim-on-memory-only-node-support	Thu Jan 19 15:29:25 2006
+++ 25-akpm/mm/vmscan.c	Thu Jan 19 15:29:25 2006
@@ -1605,7 +1605,8 @@ int zone_reclaim(struct zone *zone, gfp_
 			return 0;
 
 	if (!(gfp_mask & __GFP_WAIT) ||
-		zone->zone_pgdat->node_id != numa_node_id() ||
+		(!cpus_empty(node_to_cpumask(zone->zone_pgdat->node_id)) &&
+			 zone->zone_pgdat->node_id != numa_node_id()) ||
 		zone->all_unreclaimable ||
 		atomic_read(&zone->reclaim_in_progress) > 0)
 			return 0;
_