On Sat, 2014-07-12 at 13:25 +0400, Kirill Tkhai wrote:
> >
> > +unsigned long nr_running_cpu(int cpu)
> > +{
> > + if (cpumask_test_cpu(cpu, cpu_online_mask))
> > + return cpu_rq(cpu)->nr_running;
> > + else
> > + return 0;
> > +}
> > +
>
> Offline cpu should have nr_running equal to 0. We park last
> enqueued thread (migration_thread) at the end of take_cpu_down().
>
> So, it's enough to return cpu_rq(cpu)->nr_running.
Thanks. This seems reasonable.
Tim
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