Re: [RFC][PATCH] sched: Avoid select_idle_sibling() forwake_affine(.sync=true)

[Peter Zijlstra]

On Thu, Sep 26, 2013 at 11:58:12AM +0200, Peter Zijlstra wrote:
> @@ -3429,6 +3440,9 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
>  	int want_affine = 0;
>  	int sync = wake_flags & WF_SYNC;
>  
> +	if (sync)
> +		p->se.last_sync_wakeup = sched_clock_cpu(cpu);
> +
>  	if (p->nr_cpus_allowed == 1)
>  		return prev_cpu;
>  

Oh, I suppose something like:

 if (sync && !p->se.last_sync_wakeup)
 	p->se.last_sync_wakeup = sched_clock_cpu(cpu);

is also a nice variation to try..
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