--- linux-2.6.22.noarch/mm/vmscan.c.swapfree	2007-07-14 00:36:26.000000000 -0400
+++ linux-2.6.22.noarch/mm/vmscan.c	2007-07-14 00:35:58.000000000 -0400
@@ -892,6 +892,13 @@ static void get_scan_ratio(struct zone *
 	unsigned long anon_prio, file_prio;
 	unsigned long rotate_sum;
 
+	/* If there is no free swap space, do not scan anonymous pages. */
+	if (nr_swap_pages <= 0) {
+		*anon_percent = 0;
+		*file_percent = 100;
+		return;
+	}
+
 	anon  = zone_page_state(zone, NR_ACTIVE_ANON) +
 		zone_page_state(zone, NR_INACTIVE_ANON);
 	file  = zone_page_state(zone, NR_ACTIVE_FILE) +