linux-kernel - Re: [PATCH 13/32] nohz: Adaptive tick stop and restart on nohz cpuset

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Date:	Mon, 29 Aug 2011 17:28:09 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [PATCH 13/32] nohz: Adaptive tick stop and restart on nohz
 cpuset

On Mon, 2011-08-15 at 17:52 +0200, Frederic Weisbecker wrote:
> +bool cpuset_nohz_can_stop_tick(void)
> +{
> +       struct rq *rq;
> +
> +       rq = this_rq();
> +
> +       /* More than one running task need preemption */
> +       if (rq->nr_running > 1)
> +               return false;
> +
> +       return true;
> +} 

int sched_needs_cpu(int cpu), seems the right name, matches the existing
{rcu,printk,arch}_needs_cpu() functions.
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