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

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Date:	Mon, 18 Jan 2010 20:31:45 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.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 01/18/2010 06:57 PM, Peter Zijlstra wrote:
> 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() ?

I was worried about calling notifier callback before notifying the
sched_class of the wakeup.  Conceptually, the notifier callback should
be called after all sched internal stuff about the wakeup finish,
so...

Thanks.

-- 
tejun
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