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SubjectRe: [patch] export percpu cpuacct cgroup stats
On Fri, 5 Dec 2008 10:16:30 -0800 Ken Chen <kenchen@google.com> wrote:

> +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, "%llu ", (unsigned long long) percpu);
> + }
> + seq_printf(m, "\n");
> + return 0;
> +}

The locking is only needed for 32-bit, I assume?

The iteration across all possible CPUs seems a bit lame - that code
looks pretty easy to convert to hotplug goodness.

(All of which pertains to existing code, not to this patch).


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