vmstat.c: Support accounting for compound pages

Also fix up the accounting for active / inactive pages.

[skip for sidecar edition]

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

---
 include/linux/mm_inline.h |   41 +++++++++++++++++++++++++++++++----------
 1 file changed, 31 insertions(+), 10 deletions(-)

Index: linux-2.6.22-rc4-mm2/include/linux/mm_inline.h
===================================================================
--- linux-2.6.22-rc4-mm2.orig/include/linux/mm_inline.h	2007-06-15 17:35:33.000000000 -0700
+++ linux-2.6.22-rc4-mm2/include/linux/mm_inline.h	2007-06-19 22:58:39.000000000 -0700
@@ -2,46 +2,67 @@ static inline void
 add_page_to_active_list(struct zone *zone, struct page *page)
 {
 	list_add(&page->lru, &zone->active_list);
-	__inc_zone_state(zone, NR_ACTIVE);
+	if (!PageHead(page))
+		__inc_zone_state(zone, NR_ACTIVE);
+	else
+		__inc_zone_page_state(page, NR_ACTIVE);
 }
 
 static inline void
 add_page_to_inactive_list(struct zone *zone, struct page *page)
 {
 	list_add(&page->lru, &zone->inactive_list);
-	__inc_zone_state(zone, NR_INACTIVE);
+	if (!PageHead(page))
+		__inc_zone_state(zone, NR_INACTIVE);
+	else
+		__inc_zone_page_state(zone, NR_INACTIVE);
 }
 
 static inline void
 add_page_to_inactive_list_tail(struct zone *zone, struct page *page)
 {
 	list_add_tail(&page->lru, &zone->inactive_list);
-	__inc_zone_state(zone, NR_INACTIVE);
+	if (!PageHead(page))
+		__inc_zone_state(zone, NR_INACTIVE);
+	else
+		__inc_zone_page_state(page, NR_INACTIVE);
 }
 
 static inline void
 del_page_from_active_list(struct zone *zone, struct page *page)
 {
 	list_del(&page->lru);
-	__dec_zone_state(zone, NR_ACTIVE);
+	if (!PageHead(page))
+		__dec_zone_state(zone, NR_ACTIVE);
+	else
+		__dec_zone_page_state(page, NR_ACTIVE);
 }
 
 static inline void
 del_page_from_inactive_list(struct zone *zone, struct page *page)
 {
 	list_del(&page->lru);
-	__dec_zone_state(zone, NR_INACTIVE);
+	if (!PageHead(page))
+		__dec_zone_state(zone, NR_INACTIVE);
+	else
+		__dec_zone_page_state(page, NR_INACTIVE);
 }
 
 static inline void
 del_page_from_lru(struct zone *zone, struct page *page)
 {
+	enum zone_stat_item counter = NR_ACTIVE;
+
 	list_del(&page->lru);
-	if (PageActive(page)) {
+	if (PageActive(page))
 		__ClearPageActive(page);
-		__dec_zone_state(zone, NR_ACTIVE);
-	} else {
-		__dec_zone_state(zone, NR_INACTIVE);
-	}
+	else
+		counter = NR_INACTIVE;
+
+	if (!PageHead(page))
+		__dec_zone_state(zone, counter);
+	else
+		__dec_zone_page(page, counter);
 }
 
+