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

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Message-ID: <4FFE645F.40902@linux.vnet.ibm.com>
Date:	Thu, 12 Jul 2012 13:45:03 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] sched: remove useless code in yield_to

On 07/03/2012 02:34 PM, 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().
> 
> 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;
>  	}

Can I get some comments on this patch?

Regards,
Michael Wang

> 
>  out:
> 


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