Re: [ZVC 4/4] Inline counters for single processor configurations

[Christoph Lameter <clameter@sgi.com>]

Hmmm.. i386/x86_64 do not convert the adds to incs like ia64. Therefore 
one can decrease memory usage even further by using atomic_inc/dec 
explicitly.

Index: linux-2.6.17-mm3/include/linux/vmstat.h
===================================================================
--- linux-2.6.17-mm3.orig/include/linux/vmstat.h	2006-06-27 03:53:05.000000000 -0700
+++ linux-2.6.17-mm3/include/linux/vmstat.h	2006-06-27 03:54:16.000000000 -0700
@@ -186,12 +186,14 @@
 
 static inline void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
 {
-	zone_page_state_add(1, page_zone(page), item);
+	atomic_long_inc(&page_zone(page)->vm_stat[item]);
+	atomic_long_inc(&vm_stat[item]);
 }
 
 static inline void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
 {
-	zone_page_state_add(-1, page_zone(page), item);
+	atomic_long_dec(&page_zone(page)->vm_stat[item]);
+	atomic_long_dec(&vm_stat[item]);
 }
 
 /*
-
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