[PATCH] memcg: remove mem_cgroup_calc_mapped_ratio() take2

[KOSAKI Motohiro]

Changelog:
  v1 -> v2
    - The calc_mapped_ratio prototype also be removed.

========

Currently, mem_cgroup_calc_mapped_ratio() is unused at all.
it can be removed and KAMEZAWA-san suggested it.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Acked-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 include/linux/memcontrol.h |    6 ------
 mm/memcontrol.c            |   17 -----------------
 2 files changed, 23 deletions(-)

Index: b/mm/memcontrol.c
===================================================================
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -445,23 +445,6 @@ int task_in_mem_cgroup(struct task_struc
 	return ret;
 }
 
-/*
- * Calculate mapped_ratio under memory controller. This will be used in
- * vmscan.c for deteremining we have to reclaim mapped pages.
- */
-int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
-{
-	long total, rss;
-
-	/*
-	 * usage is recorded in bytes. But, here, we assume the number of
-	 * physical pages can be represented by "long" on any arch.
-	 */
-	total = (long) (mem->res.usage >> PAGE_SHIFT) + 1L;
-	rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS);
-	return (int)((rss * 100L) / total);
-}
-
 static int calc_inactive_ratio(struct mem_cgroup *memcg, unsigned long *present_pages)
 {
 	unsigned long active;
Index: b/include/linux/memcontrol.h
===================================================================
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -88,7 +88,6 @@ extern void mem_cgroup_end_migration(str
 /*
  * For memory reclaim.
  */
-extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem);
 extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem);
 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
@@ -203,11 +202,6 @@ static inline void mem_cgroup_end_migrat
 {
 }
 
-static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
-{
-	return 0;
-}
-
 static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
 {
 	return 0;



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