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

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Date:	Wed, 14 Jan 2009 13:03:14 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sched: introduce avg_wakeup

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;
 	}
 
 out_running:

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