[PATCH 3/3] mm, mem-hotplug: update pcp->stat_threshold when memory hotplug occur

[KOSAKI Motohiro]

Currently, cpu hotplug updates pcp->stat_threashold, but memory
hotplug doesn't. there is no reason.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Acked-by: Mel Gorman <mel@xxxxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
---
 include/linux/vmstat.h |    1 +
 mm/page_alloc.c        |    2 ++
 mm/vmstat.c            |    3 +--
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 04fa5df..5f72954 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -201,6 +201,7 @@ extern void dec_zone_state(struct zone *, enum zone_stat_item);
 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
 
 void refresh_cpu_vm_stats(int);
+void refresh_zone_stat_thresholds(void);
 
 int calculate_pressure_threshold(struct zone *zone);
 int calculate_normal_threshold(struct zone *zone);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ef90a87..10b5816 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -54,6 +54,7 @@
 #include <trace/events/kmem.h>
 #include <linux/ftrace_event.h>
 #include <linux/memcontrol.h>
+#include <linux/vmstat.h>
 
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -5130,6 +5131,7 @@ int __meminit init_per_zone_wmark_min(void)
 	if (min_free_kbytes > 65536)
 		min_free_kbytes = 65536;
 	setup_per_zone_wmarks();
+	refresh_zone_stat_thresholds();
 	setup_per_zone_lowmem_reserve();
 	setup_per_zone_inactive_ratio();
 	return 0;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 897ea9e..b23b1f5 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -157,7 +157,7 @@ int calculate_normal_threshold(struct zone *zone)
 /*
  * Refresh the thresholds for each zone.
  */
-static void refresh_zone_stat_thresholds(void)
+void refresh_zone_stat_thresholds(void)
 {
 	struct zone *zone;
 	int cpu;
@@ -1198,7 +1198,6 @@ static int __init setup_vmstat(void)
 #ifdef CONFIG_SMP
 	int cpu;
 
-	refresh_zone_stat_thresholds();
 	register_cpu_notifier(&vmstat_notifier);
 
 	for_each_online_cpu(cpu)
-- 
1.7.3.1



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