[23/41] compound pages: vmstat support

[Christoph Lameter]

Add support for compound pages so that

inc_xxxx_state() and dec_xxx_state()

will increment the ZVCs by the number of base pages of the compound page.

Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
---
 include/linux/vmstat.h |    5 ++---
 mm/vmstat.c            |   18 +++++++++++++-----
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 75370ec..6d03a5a 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -234,7 +234,7 @@ static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 static inline void __inc_zone_page_state(struct page *page,
 			enum zone_stat_item item)
 {
-	__inc_zone_state(page_zone(page), item);
+	__mod_zone_page_state(page_zone(page), item, compound_pages(page));
 }
 
 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
@@ -246,8 +246,7 @@ static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 static inline void __dec_zone_page_state(struct page *page,
 			enum zone_stat_item item)
 {
-	atomic_long_dec(&page_zone(page)->vm_stat[item]);
-	atomic_long_dec(&vm_stat[item]);
+	__mod_zone_page_state(page_zone(page), item, -compound_pages(page));
 }
 
 /*
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c64d169..3e07215 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -225,7 +225,12 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 
 void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
 {
-	__inc_zone_state(page_zone(page), item);
+	struct zone *z = page_zone(page);
+
+	if (likely(!PageHead(page)))
+		__inc_zone_state(z, item);
+	else
+		__mod_zone_page_state(z, item, compound_pages(page));
 }
 EXPORT_SYMBOL(__inc_zone_page_state);
 
@@ -246,7 +251,12 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 
 void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
 {
-	__dec_zone_state(page_zone(page), item);
+	struct zone *z = page_zone(page);
+
+	if (likely(!PageHead(page)))
+		__dec_zone_state(z, item);
+	else
+		__mod_zone_page_state(z, item, -compound_pages(page));
 }
 EXPORT_SYMBOL(__dec_zone_page_state);
 
@@ -262,11 +272,9 @@ void inc_zone_state(struct zone *zone, enum zone_stat_item item)
 void inc_zone_page_state(struct page *page, enum zone_stat_item item)
 {
 	unsigned long flags;
-	struct zone *zone;
 
-	zone = page_zone(page);
 	local_irq_save(flags);
-	__inc_zone_state(zone, item);
+	__inc_zone_page_state(page, item);
 	local_irq_restore(flags);
 }
 EXPORT_SYMBOL(inc_zone_page_state);
-- 
1.5.2.5

-- 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/