Index: linux-2.6.16-rc1-mm2/mm/vmscan.c
===================================================================
--- linux-2.6.16-rc1-mm2.orig/mm/vmscan.c	2006-01-24 08:52:14.000000000 -0800
+++ linux-2.6.16-rc1-mm2/mm/vmscan.c	2006-01-24 08:52:44.000000000 -0800
@@ -1832,6 +1832,7 @@ int zone_reclaim_mode __read_mostly;
 #define RECLAIM_WRITE (1<<1)	/* Writeout pages during reclaim */
 #define RECLAIM_SWAP (1<<2)	/* Swap pages out during reclaim */
 #define RECLAIM_SLAB (1<<3)	/* Do a global slab shrink if the zone is out of memory */
+#define RECLAIM_DEBUG (1<<10)	 /* trace zone reclaim behavior */
 
 /*
  * Mininum time between zone reclaim scans
@@ -1895,6 +1896,10 @@ int zone_reclaim(struct zone *zone, gfp_
 		sc.priority--;
 		shrink_zone(zone, &sc);
 
+		if (zone_reclaim_mode & RECLAIM_DEBUG)
+			printk(KERN_INFO "Zone reclaim priority=%d Scanned=%lu Reclaimed=%lu\n",
+				sc.priority, sc.nr_scanned, sc.nr_reclaimed);
+
 	} while (sc.nr_reclaimed < nr_pages && sc.priority > 0);
 
 	if (sc.nr_reclaimed < nr_pages && (zone_reclaim_mode & RECLAIM_SLAB)) {
Index: linux-2.6.16-rc1-mm2/Documentation/sysctl/vm.txt
===================================================================
--- linux-2.6.16-rc1-mm2.orig/Documentation/sysctl/vm.txt	2006-01-24 08:52:14.000000000 -0800
+++ linux-2.6.16-rc1-mm2/Documentation/sysctl/vm.txt	2006-01-24 08:53:19.000000000 -0800
@@ -137,6 +137,7 @@ This is a ORed together value of
 2	= Zone reclaim writes dirty pages out
 4	= Zone reclaim swaps pages
 8	= Also do a global slab reclaim pass
+1024	= Zone reclaim debug printks
 
 zone_reclaim_mode is set during bootup to 1 if it is determined that pages
 from remote zones will cause a significant performance reduction. The