Re: [PATCH 1/2] sched: recover SD_WAKE_AFFINE in select_task_rq_fairand code clean up

[Alex Shi]

On 07/26/2012 05:37 PM, Mike Galbraith wrote:

> On Thu, 2012-07-26 at 13:27 +0800, Alex Shi wrote:
> 
>> 	if (affine_sd) {
>> -		if (cpu == prev_cpu || wake_affine(affine_sd, p, sync))
>> +		if (wake_affine(affine_sd, p, sync))
>>  			prev_cpu = cpu;
>>  
>>  		new_cpu = select_idle_sibling(p, prev_cpu);
> 
> Hm, if cpu == prev_cpu, asking wake_affine() if it's ok to put wakee
> back where it came from is wasted cycles.. that's where the task is
> headed regardless of reply.
> 
> -Mike
> 




Sure. I modified the patch as below:

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