alinux: mm,memcg: export memory.{events,events.local} to v1

Export "memory.events" and "memory.events.local" from cgroup v2 to v1.
Signed-off-by: NXu Yu <xuyu@linux.alibaba.com>
Reviewed-by: NXunlei Pang <xlpang@linux.alibaba.com>

mm/memcontrol.c

@@ -4793,6 +4793,32 @@ static ssize_t memory_high_write(struct kernfs_open_file *of,
 	return nbytes;
 }
 
+static void __memory_events_show(struct seq_file *m, atomic_long_t *events)
+{
+	seq_printf(m, "low %lu\n", atomic_long_read(&events[MEMCG_LOW]));
+	seq_printf(m, "high %lu\n", atomic_long_read(&events[MEMCG_HIGH]));
+	seq_printf(m, "max %lu\n", atomic_long_read(&events[MEMCG_MAX]));
+	seq_printf(m, "oom %lu\n", atomic_long_read(&events[MEMCG_OOM]));
+	seq_printf(m, "oom_kill %lu\n",
+		   atomic_long_read(&events[MEMCG_OOM_KILL]));
+}
+
+static int memory_events_show(struct seq_file *m, void *v)
+{
+	struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+
+	__memory_events_show(m, memcg->memory_events);
+	return 0;
+}
+
+static int memory_events_local_show(struct seq_file *m, void *v)
+{
+	struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+
+	__memory_events_show(m, memcg->memory_events_local);
+	return 0;
+}
+
 static struct cftype mem_cgroup_legacy_files[] = {
 	{
 		.name = "usage_in_bytes",
@@ -4958,6 +4984,18 @@ static struct cftype mem_cgroup_legacy_files[] = {
 		.seq_show = memory_high_show,
 		.write = memory_high_write,
 	},
+	{
+		.name = "events",
+		.flags = CFTYPE_NOT_ON_ROOT,
+		.file_offset = offsetof(struct mem_cgroup, events_file),
+		.seq_show = memory_events_show,
+	},
+	{
+		.name = "events.local",
+		.flags = CFTYPE_NOT_ON_ROOT,
+		.file_offset = offsetof(struct mem_cgroup, events_local_file),
+		.seq_show = memory_events_local_show,
+	},
 	{ },	/* terminate */
 };
 
@@ -6236,32 +6274,6 @@ static ssize_t memory_max_write(struct kernfs_open_file *of,
 	return nbytes;
 }
 
-static void __memory_events_show(struct seq_file *m, atomic_long_t *events)
-{
-	seq_printf(m, "low %lu\n", atomic_long_read(&events[MEMCG_LOW]));
-	seq_printf(m, "high %lu\n", atomic_long_read(&events[MEMCG_HIGH]));
-	seq_printf(m, "max %lu\n", atomic_long_read(&events[MEMCG_MAX]));
-	seq_printf(m, "oom %lu\n", atomic_long_read(&events[MEMCG_OOM]));
-	seq_printf(m, "oom_kill %lu\n",
-		   atomic_long_read(&events[MEMCG_OOM_KILL]));
-}
-
-static int memory_events_show(struct seq_file *m, void *v)
-{
-	struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
-
-	__memory_events_show(m, memcg->memory_events);
-	return 0;
-}
-
-static int memory_events_local_show(struct seq_file *m, void *v)
-{
-	struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
-
-	__memory_events_show(m, memcg->memory_events_local);
-	return 0;
-}
-
 static int memory_stat_show(struct seq_file *m, void *v)
 {
 	struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));