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Commit 0297b803 authored by Dhaval Giani's avatar Dhaval Giani Committed by Ingo Molnar
Browse files

sched: allow cpuacct stats to be reset 



Currently the schedstats implementation does not allow the statistics
to be reset. This patch aims to allow that.

  echo 0 > cpuacct.usage

resets the usage. Any other value is not allowed and returns -EINVAL.

Signed-off-by: default avatarDhaval Giani <dhaval@linux.vnet.ibm.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 32cd756a

kernel/sched.c

+24 −0
Original line number Diff line number Diff line
@@ -8381,10 +8381,34 @@ static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft) 
	return totalcpuusage;

}



static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype,

								u64 reset)

{

	struct cpuacct *ca = cgroup_ca(cgrp);

	int err = 0;

	int i;



	if (reset) {

		err = -EINVAL;

		goto out;

	}



	for_each_possible_cpu(i) {

		u64 *cpuusage = percpu_ptr(ca->cpuusage, i);



		spin_lock_irq(&cpu_rq(i)->lock);

		*cpuusage = 0;

		spin_unlock_irq(&cpu_rq(i)->lock);

	}

out:

	return err;

}



static struct cftype files[] = {

	{

		.name = "usage",

		.read_uint = cpuusage_read,

		.write_uint = cpuusage_write,

	},

};