[23/36] compound pages: vmstat support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Add support for compound pages so that

inc_xxxx and dec_xxx

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

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

Index: linux-2.6/include/linux/vmstat.h
===================================================================
--- linux-2.6.orig/include/linux/vmstat.h	2007-08-27 19:22:13.000000000 -0700
+++ linux-2.6/include/linux/vmstat.h	2007-08-27 20:59:42.000000000 -0700
@@ -234,7 +234,7 @@ static inline void __inc_zone_state(stru
 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(stru
 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));
 }
 
 /*
Index: linux-2.6/mm/vmstat.c
===================================================================
--- linux-2.6.orig/mm/vmstat.c	2007-08-27 19:22:13.000000000 -0700
+++ linux-2.6/mm/vmstat.c	2007-08-27 20:59:42.000000000 -0700
@@ -225,7 +225,12 @@ void __inc_zone_state(struct zone *zone,
 
 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,
 
 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, e
 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);

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

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux