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Commit e9515c3c authored by Ken Chen's avatar Ken Chen Committed by Ingo Molnar
Browse files

sched, cpuacct: export percpu cpuacct cgroup stats 



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 monitoring CFS load
balancer behavior by tracking per CPU group usage.

Signed-off-by: default avatarKen Chen <kenchen@google.com>
Reviewed-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 720f5498

kernel/sched.c

+20 −0
Original line number Diff line number Diff line
@@ -9342,12 +9342,32 @@ static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype, 
	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_present_cpu(i) {

		percpu = cpuacct_cpuusage_read(ca, i);

		seq_printf(m, "%llu ", (unsigned long long) percpu);

	}

	seq_printf(m, "\n");

	return 0;

}



static struct cftype files[] = {

	{

		.name = "usage",

		.read_u64 = cpuusage_read,

		.write_u64 = cpuusage_write,

	},

	{

		.name = "usage_percpu",

		.read_seq_string = cpuacct_percpu_seq_read,

	},



};



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