linux-kernel - Re: Plumbers: Tweaking scheduler policy micro-conf RFP

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Date:	Tue, 15 May 2012 14:27:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	panto@...oniou-consulting.com, smuckle@...cinc.com,
	Juri Lelli <juri.lelli@...il.com>, mingo@...e.hu,
	linaro-sched-sig@...ts.linaro.org, rostedt@...dmis.org,
	tglx@...utronix.de, geoff@...radead.org, efault@....de,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Plumbers: Tweaking scheduler policy micro-conf RFP

On Tue, 2012-05-15 at 14:23 +0200, Peter Zijlstra wrote:
> -#else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
>  static inline int find_new_ilb(int call_cpu)
>  {
>         return nr_cpu_ids;
>  }
> -#endif 

That was missing a hunk...

--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4524,6 +4524,11 @@ static struct {
 
 static inline int find_new_ilb(int call_cpu)
 {
+       int ilb = cpumask_first(nohz.idle_cpus_mask);
+
+       if (ilb < nr_cpu_ids && idle_cpu(ilb))
+               return ilb;
+
        return nr_cpu_ids;
 }


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