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Subject[PATCH 2/3] add inactive ratio calculation function of each zone V2
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@gmail.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Rik van Riel <riel@redhat.com>
CC: Johannes Weiner <hannes@cmpxchg.org>
---
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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