linux-kernel - Re: [PATCH 06/40] sched: add wakeup/sleep sched

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Date:	Mon, 18 Jan 2010 10:57:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	torvalds@...ux-foundation.org, mingo@...e.hu, awalls@...ix.net,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	rusty@...tcorp.com.au, cl@...ux-foundation.org,
	dhowells@...hat.com, arjan@...ux.intel.com, avi@...hat.com,
	johannes@...solutions.net, andi@...stfloor.org,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 06/40] sched: add wakeup/sleep sched_notifiers and
 allow NULL notifier ops

On Mon, 2010-01-18 at 09:57 +0900, Tejun Heo wrote:

> @@ -2439,6 +2440,8 @@ static inline void ttwu_post_activation(struct task_struct *p, struct rq *rq,
>  		rq->idle_stamp = 0;
>  	}
>  #endif
> +	if (success)
> +		fire_sched_notifiers(p, wakeup);
>  }
>  
>  /**

So why can't you call fire_sched_notifier(p, wakeup) right next to
activate_task(rq, p, 1) in ttwu_activate() ?

> @@ -5481,10 +5484,12 @@ need_resched_nonpreemptible:
>  	clear_tsk_need_resched(prev);
>  
>  	if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
> -		if (unlikely(signal_pending_state(prev->state, prev)))
> +		if (unlikely(signal_pending_state(prev->state, prev))) {
>  			prev->state = TASK_RUNNING;
> -		else
> +		} else {
> +			fire_sched_notifiers(prev, sleep);
>  			deactivate_task(rq, prev, 1);
> +		}
>  		switch_count = &prev->nvcsw;
>  	}
>  


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