linux-kernel - Re: [RFC][PATCH 2/4] sched: Push put_prev_task() into pick_next

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Date:	Thu, 14 Jun 2012 10:32:01 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...nel.org, pjt@...gle.com, venki@...gle.com, efault@....de,
	glommer@...allels.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 2/4] sched: Push put_prev_task() into
 pick_next_task()

On Thu, 2012-06-14 at 15:29 +0200, Peter Zijlstra wrote:


> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -3176,7 +3176,7 @@ static void put_prev_task(struct rq *rq,
>   * Pick up the highest-prio task:
>   */
>  static inline struct task_struct *
> -pick_next_task(struct rq *rq)
> +pick_next_task(struct rq *rq, struct task_struct *prev)
>  {
>  	const struct sched_class *class;
>  	struct task_struct *p;
> @@ -3186,13 +3186,13 @@ pick_next_task(struct rq *rq)
>  	 * the fair class we can call that function directly:
>  	 */
>  	if (likely(rq->nr_running == rq->cfs.h_nr_running)) {
> -		p = fair_sched_class.pick_next_task(rq);
> +		p = fair_sched_class.pick_next_task(rq, prev);
>  		if (likely(p))
>  			return p;
>  	}
>  
>  	for_each_class(class) {
> -		p = class->pick_next_task(rq);
> +		p = class->pick_next_task(rq, prev);
>  		if (p)
>  			return p;
>  	}
> @@ -3253,8 +3253,9 @@ static void __sched __schedule(void)
>  	if (unlikely(!rq->nr_running))
>  		idle_balance(cpu, rq);
>  
> -	put_prev_task(rq, prev);

You remove the call to put_prev_task() which looks to be the only user
of this static function. But I don't see the deletion of this function.

-- Steve

> -	next = pick_next_task(rq);
> +	if (prev->on_rq || rq->skip_clock_update < 0)
> +		update_rq_clock(rq);
> +	next = pick_next_task(rq, prev);
>  	clear_tsk_need_resched(prev);
>  	rq->skip_clock_update = 0;
>  
> @@ -5200,7 +5201,7 @@ static void migrate_tasks(unsigned int d
>  		if (rq->nr_running == 1)
>  			break;
>  
> -		next = pick_next_task(rq);
> +		next = pick_next_task(rq, NULL);
>  		BUG_ON(!next);
>  		next->sched_class->put_prev_task(rq, next);
>  


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