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

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Date:	Mon, 14 Jul 2014 10:51:31 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	tkhai@...dex.ru
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"H. Peter Anvin" <hpa@...or.com>,
	"David S.Miller" <davem@...emloft.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	Vinodh Gopal <vinodh.gopal@...el.com>,
	James Guilford <james.guilford@...el.com>,
	Wajdi Feghali <wajdi.k.feghali@...el.com>,
	Jussi Kivilinna <jussi.kivilinna@....fi>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 6/7] sched: add function nr_running_cpu to expose
 number of tasks running on cpu

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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