sched, cpuacct: export percpu cpuacct cgroup stats (e9515c3c) · Commits · 戴 / test

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:

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

Li Zefan <lizf@cn.fujitsu.com> Reviewed-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Ingo Molnar <mingo@elte.hu>

kernel/sched.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -9342,12 +9342,32 @@ 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_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)

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