memcg: simple stats for memory resource controller

Implement trivial statistics for the memory resource controller.

Signed-off-by: Balaji Rao <balajirrao@gmail.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Dhaval Giani <dhaval@linux.vnet.ibm.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 33add96..e46451e 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -48,6 +48,8 @@ enum mem_cgroup_stat_index {
         */
        MEM_CGROUP_STAT_CACHE,     /* # of pages charged as cache */
        MEM_CGROUP_STAT_RSS,       /* # of pages charged as rss */
+       MEM_CGROUP_STAT_PGPGIN_COUNT,   /* # of pages paged in */
+       MEM_CGROUP_STAT_PGPGOUT_COUNT,  /* # of pages paged out */
 
        MEM_CGROUP_STAT_NSTATS,
 };
@@ -199,6 +201,13 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, int flags,
                __mem_cgroup_stat_add_safe(stat, MEM_CGROUP_STAT_CACHE, val);
        else
                __mem_cgroup_stat_add_safe(stat, MEM_CGROUP_STAT_RSS, val);
+
+       if (charge)
+               __mem_cgroup_stat_add_safe(stat,
+                               MEM_CGROUP_STAT_PGPGIN_COUNT, 1);
+       else
+               __mem_cgroup_stat_add_safe(stat,
+                               MEM_CGROUP_STAT_PGPGOUT_COUNT, 1);
 }
 
 static struct mem_cgroup_per_zone *
@@ -884,6 +893,8 @@ static const struct mem_cgroup_stat_desc {
 } mem_cgroup_stat_desc[] = {
        [MEM_CGROUP_STAT_CACHE] = { "cache", PAGE_SIZE, },
        [MEM_CGROUP_STAT_RSS] = { "rss", PAGE_SIZE, },
+       [MEM_CGROUP_STAT_PGPGIN_COUNT] = {"pgpgin", 1, },
+       [MEM_CGROUP_STAT_PGPGOUT_COUNT] = {"pgpgout", 1, },
 };
 
 static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,