[PATCH] vmscan: total_scanned fix

We haven't been incrementing local variable total_scanned since the
scan_control stuff went in.  That broke kswapd throttling.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/vmscan.c

@@ -1063,6 +1063,7 @@ static int balance_pgdat(pg_data_t *pgdat, int nr_pages)
 			shrink_slab(sc.nr_scanned, GFP_KERNEL, lru_pages);
 			sc.nr_reclaimed += reclaim_state->reclaimed_slab;
 			total_reclaimed += sc.nr_reclaimed;
+			total_scanned += sc.nr_scanned;
 			if (zone->all_unreclaimable)
 				continue;
 			if (zone->pages_scanned >= (zone->nr_active +