linux-kernel - Re: [PATCH 1/2] sched: introduce avg

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Date:	Wed, 14 Jan 2009 13:05:58 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sched: introduce avg_wakeup


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, 2009-01-14 at 12:59 +0100, Peter Zijlstra wrote:
> > +       /*
> > +        * Only attribute actual wakeups done by this task.
> > +        */
> > +       if (!in_interrupt()) {
> > +               struct sched_entity *se = &current->se;
> > +               u64 sample = se->sum_exec_runtime;
> > +
> > +               if (se->last_wakeup)
> > +                       sample -= se->last_wakeup;
> > +               else
> > +                       sample -= se->start_runtime;
> > +               update_avg(&se->avg_wakeup, sample);
> > +
> > +               current->se.last_wakeup = current->se.sum_exec_runtime;
> > +       }
> 
> time for lunch apparently...
> 
> Index: linux-2.6/kernel/sched.c
> ===================================================================
> --- linux-2.6.orig/kernel/sched.c
> +++ linux-2.6/kernel/sched.c
> @@ -2424,7 +2424,7 @@ out_activate:
>  			sample -= se->start_runtime;
>  		update_avg(&se->avg_wakeup, sample);
>  
> -		current->se.last_wakeup = current->se.sum_exec_runtime;
> +		se.last_wakeup = se.sum_exec_runtime;
>  	}

mind sending a delta against the first submission? Whenever you are done 
with the lunch stuff ;-)

	Ingo
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