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Subject[patch] export percpu cpuacct cgroup stats
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This patch export per-cpu CPU cycle usage for a given cpuacct cgroup.
There is a need for a user space monitor daemon to track group CPU
usage on per-cpu base. It is also useful for monitor CFS load
balancer behavior by tracking per CPU group usage.


Signed-off-by: Ken Chen <kenchen@google.com>

diff --git a/kernel/sched.c b/kernel/sched.c
index b7480fb..cd78948 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -9345,12 +9345,34 @@ out:
return err;
}

+static int cpuacct_percpu_seq_read(struct cgroup *cgroup, struct cftype *cft,
+ struct seq_file *m)
+{
+ struct cpuacct *ca = cgroup_ca(cgroup);
+ u64 percpu;
+ int i;
+
+ for_each_possible_cpu(i) {
+ spin_lock_irq(&cpu_rq(i)->lock);
+ percpu = *percpu_ptr(ca->cpuusage, i);
+ spin_unlock_irq(&cpu_rq(i)->lock);
+ seq_printf(m, "%lld ", percpu);
+ }
+ seq_printf(m, "\n");
+ return 0;
+}
+
static struct cftype files[] = {
{
.name = "usage",
.read_u64 = cpuusage_read,
.write_u64 = cpuusage_write,
},
+ {
+ .name = "percpu",
+ .read_seq_string = cpuacct_percpu_seq_read,
+ },
+
};

static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)

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