linux-kernel - Re: [RFC][PATCH 14/17] sched: Remove rq argument to ttwu

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Date:	Wed, 29 Dec 2010 22:40:44 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Chris Mason <chris.mason@...cle.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>,
	Oleg Nesterov <oleg@...hat.com>, Paul Turner <pjt@...gle.com>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 14/17] sched: Remove rq argument to ttwu_stat()

On Fri, Dec 24, 2010 at 01:23:52PM +0100, Peter Zijlstra wrote:
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  kernel/sched.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> Index: linux-2.6/kernel/sched.c
> ===================================================================
> --- linux-2.6.orig/kernel/sched.c
> +++ linux-2.6/kernel/sched.c
> @@ -2367,10 +2367,11 @@ static void update_avg(u64 *avg, u64 sam
>  #endif
>  
>  static void
> -ttwu_stat(struct rq *rq, struct task_struct *p, int cpu, int wake_flags)
> +ttwu_stat(struct task_struct *p, int cpu, int wake_flags)
>  {
>  #ifdef CONFIG_SCHEDSTATS
>  	int this_cpu = smp_processor_id();
> +	struct rq *rq = this_rq();

			task_rq(p)?

>  
>  	schedstat_inc(rq, ttwu_count);
>  	schedstat_inc(p, se.statistics.nr_wakeups);
> @@ -2491,9 +2492,10 @@ try_to_wake_up(struct task_struct *p, un
>  	activate_task(rq, p, ENQUEUE_WAKEUP | ENQUEUE_WAKING);
>  out_running:
>  	ttwu_post_activation(p, rq, wake_flags);
> -	ttwu_stat(rq, p, cpu, wake_flags);
>  	success = 1;
>  	__task_rq_unlock(rq);
> +
> +	ttwu_stat(p, cpu, wake_flags);

Typo? You just put it out of rq_lock.

Thanks,
Yong

>  out:
>  	raw_spin_unlock_irqrestore(&p->pi_lock, flags);
>  	put_cpu();
> @@ -2527,7 +2529,7 @@ static void try_to_wake_up_local(struct 
>  		activate_task(rq, p, ENQUEUE_WAKEUP);
>  
>  	ttwu_post_activation(p, rq, 0);
> -	ttwu_stat(rq, p, smp_processor_id(), 0);
> +	ttwu_stat(p, smp_processor_id(), 0);
>  out:
>  	raw_spin_unlock(&p->pi_lock);
>  }
--
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