From: Johannes Weiner <jweiner@redhat.com>
Date: Thu, 8 Dec 2011 04:42:46 +0000 (+1100)
Subject: mm: memcg: clean up fault accounting
X-Git-Tag: next-20111213~1^2~39
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d51c442dca3f4529810271d94320316578e44289;p=karo-tx-linux.git

mm: memcg: clean up fault accounting

The fault accounting functions have a single, memcg-internal user, so they
don't need to be global.  In fact, their one-line bodies can be directly
folded into the caller.  And since faults happen one at a time, use
this_cpu_inc() directly instead of this_cpu_add(foo, 1).

Signed-off-by: Johannes Weiner <jweiner@redhat.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 859ed879b2d8..5f06f4b54587 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -589,16 +589,6 @@ static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
 	this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAPOUT], val);
 }
 
-void mem_cgroup_pgfault(struct mem_cgroup *memcg, int val)
-{
-	this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT], val);
-}
-
-void mem_cgroup_pgmajfault(struct mem_cgroup *memcg, int val)
-{
-	this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT], val);
-}
-
 static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
 					    enum mem_cgroup_events_index idx)
 {
@@ -913,10 +903,10 @@ void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 
 	switch (idx) {
 	case PGMAJFAULT:
-		mem_cgroup_pgmajfault(memcg, 1);
+		this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]);
 		break;
 	case PGFAULT:
-		mem_cgroup_pgfault(memcg, 1);
+		this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
 		break;
 	default:
 		BUG();