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

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Message-ID: <1263818967.4283.459.camel@laptop>
Date:	Mon, 18 Jan 2010 13:49:27 +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 20:31 +0900, Tejun Heo wrote:
> 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...

I'm thinking that we can place it next to activate_task(), if it makes
you feel better you can place them both at the end up ttwu_activate()
instead of in the middle.

Esp. with the callback you have it really doesn't matter.

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