Variable Page Cache Size: Fix up reclaim counters

We can now reclaim larger pages. Adjust the VM counters to deal with it.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 mm/vmscan.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

Index: linux-2.6.21-rc7-mm1/mm/vmscan.c
===================================================================
--- linux-2.6.21-rc7-mm1.orig/mm/vmscan.c	2007-04-24 13:19:13.000000000 -0700
+++ linux-2.6.21-rc7-mm1/mm/vmscan.c	2007-04-25 08:06:30.000000000 -0700
@@ -458,7 +458,7 @@ static unsigned long shrink_page_list(st
 
 		VM_BUG_ON(PageActive(page));
 
-		sc->nr_scanned++;
+		sc->nr_scanned += compound_pages(page);
 
 		/*
 		 * MADV_DONTNEED pages get reclaimed lazily, unless the
@@ -483,7 +483,7 @@ static unsigned long shrink_page_list(st
 
 		/* Double the slab pressure for mapped and swapcache pages */
 		if (page_mapped(page) || PageSwapCache(page))
-			sc->nr_scanned++;
+			sc->nr_scanned += compound_pages(page);
 
 		if (PageWriteback(page))
 			goto keep_locked;
@@ -587,7 +587,7 @@ static unsigned long shrink_page_list(st
 
 free_it:
 		unlock_page(page);
-		nr_reclaimed++;
+		nr_reclaimed += compound_pages(page);
 		if (!pagevec_add(&freed_pvec, page))
 			__pagevec_release_nonlru(&freed_pvec);
 		continue;
@@ -671,7 +671,7 @@ static unsigned long isolate_lru_pages(u
 	unsigned long nr_taken = 0;
 	unsigned long scan;
 
-	for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
+	for (scan = 0; scan < nr_to_scan && !list_empty(src); ) {
 		struct page *page;
 		unsigned long pfn;
 		unsigned long end_pfn;
@@ -686,7 +686,7 @@ static unsigned long isolate_lru_pages(u
 		switch (__isolate_lru_page(page, active)) {
 		case 0:
 			list_move(&page->lru, dst);
-			nr_taken++;
+			nr_taken += compound_pages(page);
 			break;
 
 		case -EBUSY:
@@ -732,7 +732,7 @@ static unsigned long isolate_lru_pages(u
 			switch (__isolate_lru_page(cursor_page, active)) {
 			case 0:
 				list_move(&cursor_page->lru, dst);
-				nr_taken++;
+				nr_taken += compound_pages(cursor_page);
 				scan++;
 				break;
 
@@ -743,6 +743,7 @@ static unsigned long isolate_lru_pages(u
 				break;
 			}
 		}
+		scan += compound_pages(page);
 	}
 
 	*scanned = scan;
@@ -978,7 +979,7 @@ force_reclaim_mapped:
 		ClearPageActive(page);
 
 		list_move(&page->lru, &zone->inactive_list);
-		pgmoved++;
+		pgmoved += compound_pages(page);
 		if (!pagevec_add(&pvec, page)) {
 			__mod_zone_page_state(zone, NR_INACTIVE, pgmoved);
 			spin_unlock_irq(&zone->lru_lock);
@@ -1006,7 +1007,7 @@ force_reclaim_mapped:
 		SetPageLRU(page);
 		VM_BUG_ON(!PageActive(page));
 		list_move(&page->lru, &zone->active_list);
-		pgmoved++;
+		pgmoved += compound_pages(page);
 		if (!pagevec_add(&pvec, page)) {
 			__mod_zone_page_state(zone, NR_ACTIVE, pgmoved);
 			pgmoved = 0;