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

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Date:	Mon, 07 Dec 2009 09:50:03 +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 Mon, 2009-12-07 at 12:26 +0900, Tejun Heo wrote:
> Hello,
> 
> On 12/04/2009 07:44 PM, Peter Zijlstra wrote:
> > 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
> 
> Hmmm... it was intentional as, before this patch, there's no
> try_to_wake_up_local() so it was strange to mention it in the comment.
> I can move the comments but I don't think it's particularly better
> that way.

/me reads the comments and goes ah!

OK, maybe you've got a point there ;-)

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