---

yaml
---
r: 72761
b: refs/heads/master
c: fe5c7cc
h: refs/heads/master
i:
  72759: 4e1db54
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ae8393e508e5f17add66964688c49bf0bfe4fcf9
+refs/heads/master: fe5c7cc22897b809a2fbe05bea71963853df7f17

trunk/kernel/sched.c

@@ -7211,15 +7211,43 @@ static u64 cpu_shares_read_uint(struct cgroup *cgrp, struct cftype *cft)
 	return (u64) tg->shares;
 }
 
-static struct cftype cpu_shares = {
-	.name = "shares",
-	.read_uint = cpu_shares_read_uint,
-	.write_uint = cpu_shares_write_uint,
+static u64 cpu_usage_read(struct cgroup *cgrp, struct cftype *cft)
+{
+	struct task_group *tg = cgroup_tg(cgrp);
+	unsigned long flags;
+	u64 res = 0;
+	int i;
+
+	for_each_possible_cpu(i) {
+		/*
+		 * Lock to prevent races with updating 64-bit counters
+		 * on 32-bit arches.
+		 */
+		spin_lock_irqsave(&cpu_rq(i)->lock, flags);
+		res += tg->se[i]->sum_exec_runtime;
+		spin_unlock_irqrestore(&cpu_rq(i)->lock, flags);
+	}
+	/* Convert from ns to ms */
+	do_div(res, 1000000);
+
+	return res;
+}
+
+static struct cftype cpu_files[] = {
+	{
+		.name = "shares",
+		.read_uint = cpu_shares_read_uint,
+		.write_uint = cpu_shares_write_uint,
+	},
+	{
+		.name = "usage",
+		.read_uint = cpu_usage_read,
+	},
 };
 
 static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
 {
-	return cgroup_add_file(cont, ss, &cpu_shares);
+	return cgroup_add_files(cont, ss, cpu_files, ARRAY_SIZE(cpu_files));
 }
 
 struct cgroup_subsys cpu_cgroup_subsys = {