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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index aeb2393..93cb16d 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -655,16 +655,6 @@ 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)
 {
@@ -978,11 +968,11 @@ void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
                goto out;
 
        switch (idx) {
-       case PGMAJFAULT:
-               mem_cgroup_pgmajfault(memcg, 1);
-               break;
        case PGFAULT:
-               mem_cgroup_pgfault(memcg, 1);
+               this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]);
+               break;
+       case PGMAJFAULT:
+               this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
                break;
        default:
                BUG();