linux-kernel - Re: [PATCH] sched: remove useless code in yield

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Message-ID: <50037EF2.80704@linux.vnet.ibm.com>
Date:	Mon, 16 Jul 2012 10:39:46 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] sched: remove useless code in yield_to

On 07/12/2012 10:07 PM, Peter Zijlstra wrote:
> On Tue, 2012-07-03 at 14:34 +0800, Michael Wang wrote:
>> From: Michael Wang <wangyun@...ux.vnet.ibm.com>
>>
>> it's impossible to enter else branch if we have set skip_clock_update
>> in task_yield_fair(), as yield_to_task_fair() will directly return
>> true after invoke task_yield_fair().
> 
> It helps if you CC the guy who wrote the code.. 

Oh, my fault..., will take care next time.

I think you're right,
> although getting that skip_clock_update crap wrong is annoying.
> 
> Mike?
> 
> 
>> Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
>> ---
>>  kernel/sched/core.c |    7 -------
>>  1 files changed, 0 insertions(+), 7 deletions(-)
>>
>> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
>> index 9bb7d28..77c14aa 100644
>> --- a/kernel/sched/core.c
>> +++ b/kernel/sched/core.c
>> @@ -4737,13 +4737,6 @@ again:
>>  		 */
>>  		if (preempt && rq != p_rq)
>>  			resched_task(p_rq->curr);
>> -	} else {
>> -		/*
>> -		 * We might have set it in task_yield_fair(), but are
>> -		 * not going to schedule(), so don't want to skip
>> -		 * the next update.
>> -		 */
>> -		rq->skip_clock_update = 0;
>>  	}
>>  
>>  out:
> 
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