Re: [PATCH v4 6/7] sched: add function nr_running_cpu to expose number of tasks running on cpu

[Tim Chen]

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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