Re: [RFC PATCH 05/15] nohz_task: Restart the tick when anothertask compete on the cpu

[Peter Zijlstra]

On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
> +#ifdef CONFIG_NO_HZ_TASK
> +       /*
> +        * CHECKME:
> +        * Ideally, we need to check if the target has a nohz task
> +        * and only send the IPI if so. But there is nothing but
> +        * a racy way to do that. Or can we assume at that point
> +        * of the wake up that if cpu_has_nohz_task(cpu) is 0, then
> +        * it's ok, even if it has a task about to switch to nohz
> +        * task mode?
> +        */
> +       if (rq->nr_running == 2)
> +               smp_send_update_nohz_task_cpu(cpu);
> +#endif 

This is the wrong place, use ttwu_activate(), since activate_task() is
the thing that pokes at nr_running.
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