Re: [PATCH] RFC: Set irq thread to RT priority on creation

[Steven Rostedt]

On Thu, 2013-05-30 at 14:12 +0200, Ivo Sieben wrote:

>  kernel/irq/manage.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index fa17855..0ffe37b 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -950,6 +950,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, 
> struct irqaction *new)
>        */
>       if (new->thread_fn && !nested) {
>               struct task_struct *t;
> +             static const struct sched_param param = {
> +                     .sched_priority = MAX_USER_RT_PRIO/2,
> +             };
>  
>               t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
>                                  new->name);
> @@ -957,6 +960,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, 
> struct irqaction *new)
>                       ret = PTR_ERR(t);
>                       goto out_mput;
>               }
> +
> +             sched_setscheduler(t, SCHED_FIFO, &param);
> +

If you are adding this here, might as well remove the
sched_set_scheduler() from irq_thread() as well. No need to do it twice.

-- Steve

>               /*
>                * We keep the reference to the task struct even if
>                * the thread dies to avoid that the interrupt code


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