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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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