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

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Message-ID: <4B1C75F3.9080808@kernel.org>
Date:	Mon, 07 Dec 2009 12:26:43 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.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()

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.

Thanks.

-- 
tejun
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