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Subject[-mm][PATCH 2/5] introduce get_vm_event()
introduce get_vm_event() new function for easy use vm statics.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

---
include/linux/vmstat.h | 7 ++++++-
mm/vmstat.c | 14 ++++++++++++++
2 files changed, 20 insertions(+), 1 deletion(-)
Index: b/include/linux/vmstat.h
===================================================================
--- a/include/linux/vmstat.h 2008-05-02 23:40:39.000000000 +0900
+++ b/include/linux/vmstat.h 2008-05-03 00:23:17.000000000 +0900
@@ -92,6 +92,8 @@ static inline void vm_events_fold_cpu(in
}
#endif

+unsigned long get_vm_event(enum vm_event_item event_type);
+
#else

/* Disable counters */
@@ -113,7 +115,10 @@ static inline void all_vm_events(unsigne
static inline void vm_events_fold_cpu(int cpu)
{
}
-
+static inline unsigned long get_vm_event(enum vm_event_item event_type)
+{
+ return 0;
+}
#endif /* CONFIG_VM_EVENT_COUNTERS */

#define __count_zone_vm_events(item, zone, delta) \
Index: b/mm/vmstat.c
===================================================================
--- a/mm/vmstat.c 2008-05-02 23:40:39.000000000 +0900
+++ b/mm/vmstat.c 2008-05-02 23:43:28.000000000 +0900
@@ -46,6 +46,20 @@ void all_vm_events(unsigned long *ret)
}
EXPORT_SYMBOL_GPL(all_vm_events);

+unsigned long get_vm_event(enum vm_event_item event_type)
+{
+ int cpu;
+ unsigned long ret = 0;
+
+ for_each_cpu_mask(cpu, cpu_online_map) {
+ struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
+
+ ret += this->event[event_type];
+ }
+
+ return ret;
+}
+
#ifdef CONFIG_HOTPLUG
/*
* Fold the foreign cpu events into our own.



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