[PATCH 2/3] add inactive ratio calculation function of each zone V2

[Minchan Kim]

Changelog since V1 
 o Change function name from calculate_zone_inactive_ratio to calculate_inactive_ratio
   - by Mel Gorman advise
 o Modify tab indent - by Mel Gorman advise

This patch devide setup_per_zone_inactive_ratio with
per-zone inactive ratio calculaton.

This patch is just for helping my next patch.
(reset wmark_min and inactive ratio of zone when hotplug happens)

Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
CC: Rik van Riel <riel@xxxxxxxxxx>
CC: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 include/linux/mm.h |    1 +
 mm/page_alloc.c    |   28 ++++++++++++++++------------
 2 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7ea4d1b..5d7a835 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1059,6 +1059,7 @@ extern void set_dma_reserve(unsigned long new_dma_reserve);
 extern void memmap_init_zone(unsigned long, int, unsigned long,
 				unsigned long, enum memmap_context);
 extern void setup_per_zone_wmarks(void);
+extern void calculate_zone_inactive_ratio(struct zone *zone);
 extern void mem_init(void);
 extern void __init mmap_init(void);
 extern void show_mem(void);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b518ea7..f11cfbf 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4553,22 +4553,26 @@ void setup_per_zone_wmarks(void)
  *    1TB     101        10GB
  *   10TB     320        32GB
  */
-static void __init setup_per_zone_inactive_ratio(void)
+void calculate_zone_inactive_ratio(struct zone *zone)
 {
-	struct zone *zone;
+	unsigned int gb, ratio;
 
-	for_each_zone(zone) {
-		unsigned int gb, ratio;
+	/* Zone size in gigabytes */
+	gb = zone->present_pages >> (30 - PAGE_SHIFT);
+	if (gb)
+		ratio = int_sqrt(10 * gb);
+	else
+		ratio = 1;
 
-		/* Zone size in gigabytes */
-		gb = zone->present_pages >> (30 - PAGE_SHIFT);
-		if (gb)
-			ratio = int_sqrt(10 * gb);
-		else
-			ratio = 1;
+	zone->inactive_ratio = ratio;
+}
 
-		zone->inactive_ratio = ratio;
-	}
+static void __init setup_per_zone_inactive_ratio(void)
+{
+	struct zone *zone;
+
+	for_each_zone(zone)
+		calculate_zone_inactive_ratio(zone);	
 }
 
 /*
-- 
1.5.4.3

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