Index: linux-2.6/include/linux/mmzone.h
===================================================================
--- linux-2.6.orig/include/linux/mmzone.h	2007-07-31 12:25:18.000000000 -0700
+++ linux-2.6/include/linux/mmzone.h	2007-07-31 12:25:41.000000000 -0700
@@ -234,6 +234,7 @@ struct zone {
 	unsigned long		nr_scan_inactive;
 	unsigned long		pages_scanned;	   /* since last reclaim */
 	int			all_unreclaimable; /* All pages pinned */
+	int			unmapped_unreclaimable;	/* Unmapped pages are unreclaimable */
 
 	/* A count of how many reclaimers are scanning this zone */
 	atomic_t		reclaim_in_progress;
Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c	2007-07-31 12:21:23.000000000 -0700
+++ linux-2.6/mm/vmscan.c	2007-07-31 12:29:27.000000000 -0700
@@ -1759,7 +1759,10 @@ static int __zone_reclaim(struct zone *z
 			note_zone_scanning_priority(zone, priority);
 			nr_reclaimed += shrink_zone(priority, zone, &sc);
 			priority--;
-		} while (priority >= 0 && nr_reclaimed < nr_pages);
+		} while (priority >= 0 && nr_reclaimed < nr_pages &&
+			!zone->unmapped_unreclaimable);
+
+		zone->unmapped_reclaimable = !nr_reclaimed;
 	}
 
 	slab_reclaimable = zone_page_state(zone, NR_SLAB_RECLAIMABLE);