mm: memcontrol: re-use global VM event enum

The current duplication is a high-maintenance mess, and it's painful to
add new items.

This increases the size of the event array, but we'll eventually want
most of the VM events tracked on a per-cgroup basis anyway.

Link: http://lkml.kernel.org/r/20170404220148.28338-2-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 28 insertions, 25 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1ffa3ad201ea..6b42887e5f14 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -111,13 +111,6 @@ static const char * const mem_cgroup_stat_names[] = {
         "swap",
 };
 
-static const char * const mem_cgroup_events_names[] = {
-        "pgpgin",
-        "pgpgout",
-        "pgfault",
-        "pgmajfault",
-};
-
 static const char * const mem_cgroup_lru_names[] = {
         "inactive_anon",
         "active_anon",
@@ -571,13 +564,13 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
  */
 
 static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
-                                            enum mem_cgroup_events_index idx)
+                                            enum memcg_event_item event)
 {
         unsigned long val = 0;
         int cpu;
 
         for_each_possible_cpu(cpu)
-                val += per_cpu(memcg->stat->events[idx], cpu);
+                val += per_cpu(memcg->stat->events[event], cpu);
         return val;
 }
 
@@ -608,9 +601,9 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
 
         /* pagein of a big page is an event. So, ignore page size */
         if (nr_pages > 0)
-                __this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGIN]);
+                __this_cpu_inc(memcg->stat->events[PGPGIN]);
         else {
-                __this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT]);
+                __this_cpu_inc(memcg->stat->events[PGPGOUT]);
                 nr_pages = -nr_pages; /* for event */
         }
 
@@ -3119,6 +3112,21 @@ static int memcg_numa_stat_show(struct seq_file *m, void *v)
 }
 #endif /* CONFIG_NUMA */
 
+/* Universal VM events cgroup1 shows, original sort order */
+unsigned int memcg1_events[] = {
+        PGPGIN,
+        PGPGOUT,
+        PGFAULT,
+        PGMAJFAULT,
+};
+
+static const char *const memcg1_event_names[] = {
+        "pgpgin",
+        "pgpgout",
+        "pgfault",
+        "pgmajfault",
+};
+
 static int memcg_stat_show(struct seq_file *m, void *v)
 {
         struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
@@ -3128,8 +3136,6 @@ static int memcg_stat_show(struct seq_file *m, void *v)
 
         BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_stat_names) !=
                      MEM_CGROUP_STAT_NSTATS);
-        BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_events_names) !=
-                     MEM_CGROUP_EVENTS_NSTATS);
         BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_lru_names) != NR_LRU_LISTS);
 
         for (i = 0; i < MEM_CGROUP_STAT_NSTATS; i++) {
@@ -3139,9 +3145,9 @@ static int memcg_stat_show(struct seq_file *m, void *v)
                            mem_cgroup_read_stat(memcg, i) * PAGE_SIZE);
         }
 
-        for (i = 0; i < MEM_CGROUP_EVENTS_NSTATS; i++)
-                seq_printf(m, "%s %lu\n", mem_cgroup_events_names[i],
-                           mem_cgroup_read_events(memcg, i));
+        for (i = 0; i < ARRAY_SIZE(memcg1_events); i++)
+                seq_printf(m, "%s %lu\n", memcg1_event_names[i],
+                           mem_cgroup_read_events(memcg, memcg1_events[i]));
 
         for (i = 0; i < NR_LRU_LISTS; i++)
                 seq_printf(m, "%s %lu\n", mem_cgroup_lru_names[i],
@@ -3169,13 +3175,12 @@ static int memcg_stat_show(struct seq_file *m, void *v)
                 seq_printf(m, "total_%s %llu\n", mem_cgroup_stat_names[i], val);
         }
 
-        for (i = 0; i < MEM_CGROUP_EVENTS_NSTATS; i++) {
+        for (i = 0; i < ARRAY_SIZE(memcg1_events); i++) {
                 unsigned long long val = 0;
 
                 for_each_mem_cgroup_tree(mi, memcg)
-                        val += mem_cgroup_read_events(mi, i);
-                seq_printf(m, "total_%s %llu\n",
-                           mem_cgroup_events_names[i], val);
+                        val += mem_cgroup_read_events(mi, memcg1_events[i]);
+                seq_printf(m, "total_%s %llu\n", memcg1_event_names[i], val);
         }
 
         for (i = 0; i < NR_LRU_LISTS; i++) {
@@ -5222,10 +5227,8 @@ static int memory_stat_show(struct seq_file *m, void *v)
 
         /* Accumulated memory events */
 
-        seq_printf(m, "pgfault %lu\n",
-                   events[MEM_CGROUP_EVENTS_PGFAULT]);
-        seq_printf(m, "pgmajfault %lu\n",
-                   events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
+        seq_printf(m, "pgfault %lu\n", events[PGFAULT]);
+        seq_printf(m, "pgmajfault %lu\n", events[PGMAJFAULT]);
 
         seq_printf(m, "workingset_refault %lu\n",
                    stat[MEMCG_WORKINGSET_REFAULT]);
@@ -5493,7 +5496,7 @@ static void uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout,
         __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_CACHE], nr_file);
         __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS_HUGE], nr_huge);
         __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_SHMEM], nr_shmem);
-        __this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT], pgpgout);
+        __this_cpu_add(memcg->stat->events[PGPGOUT], pgpgout);
         __this_cpu_add(memcg->stat->nr_page_events, nr_pages);
         memcg_check_events(memcg, dummy_page);
         local_irq_restore(flags);