From mboxrd@z Thu Jan  1 00:00:00 1970
From: peterz@infradead.org (Peter Zijlstra)
Date: Tue, 26 Mar 2013 13:37:23 +0100
Subject: [RFC PATCH v3 3/6] sched: pack small tasks
In-Reply-To: <1363955155-18382-4-git-send-email-vincent.guittot@linaro.org>
References: <1363955155-18382-1-git-send-email-vincent.guittot@linaro.org>
 <1363955155-18382-4-git-send-email-vincent.guittot@linaro.org>
Message-ID: <1364301443.5053.9.camel@laptop>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Fri, 2013-03-22 at 13:25 +0100, Vincent Guittot wrote:
> +static bool is_light_task(struct task_struct *p)
> +{
> +       /* A light task runs less than 20% in average */
> +       return ((p->se.avg.runnable_avg_sum  * 5) <
> +                       (p->se.avg.runnable_avg_period));
> +}

OK, so we have a 'problem' here, we initialize runnable_avg_* to 0, but
we want to 'assume' a fresh task is fully 'loaded'. IIRC Alex ran into
this as well.

PJT, do you have any sane solution for this, I forgot what the result
of the last discussion was -- was there any?