linux-kernel - Re: [PATCH 7/7] sched: implement try_to_wake_up

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Date:	Fri, 04 Dec 2009 11:44:47 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	tglx@...utronix.de, mingo@...e.hu, avi@...hat.com, efault@....de,
	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] sched: implement try_to_wake_up_local()

On Wed, 2009-12-02 at 12:56 +0900, Tejun Heo wrote:

> +++ b/kernel/sched.c
> @@ -2410,6 +2410,10 @@ static inline void ttwu_woken_up(struct task_struct *p, struct rq *rq,
>  		rq->idle_stamp = 0;
>  	}
>  #endif
> +	/*
> +	 * Wake up is complete, fire wake up notifier.  This allows
> +	 * try_to_wake_up_local() to be called from wake up notifiers.
> +	 */
>  	if (success)
>  		fire_sched_notifiers(p, wakeup);
>  }

> @@ -5437,6 +5488,11 @@ need_resched_nonpreemptible:
>  		if (unlikely(signal_pending_state(prev->state, prev))) {
>  			prev->state = TASK_RUNNING;
>  		} else {
> +			/*
> +			 * Fire sleep notifier before changing any scheduler
> +			 * state.  This allows try_to_wake_up_local() to be
> +			 * called from sleep notifiers.
> +			 */
>  			fire_sched_notifiers(prev, sleep);
>  			deactivate_task(rq, prev, 1);
>  		}

These two hunks seem to belong to patch 6

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