linux-kernel - Re: Changing Kernel thread priorities

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Date:	Mon, 6 Jun 2011 12:54:20 +0100
From:	Rolando Martins <rolando.martins@...il.com>
To:	Monica Puig-Pey <puigpeym@...can.es>
Cc:	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Changing Kernel thread priorities

Hi,
I use the following:

PIDs=$(ps -eLo pid,cls,rtprio,pri,nice,cmd | grep -i "irq" | awk '{
print $1; }' | xargs echo)
for i in $PIDs
do
    ret=$(chrt -f -p 99 $i)
done

This will change the kernel thread associated with an irq handler to
RT FIFO prio 99.
Just change the script to your specific interrupt.

Hope it helps,
Rolando

On Mon, Jun 6, 2011 at 12:47 PM, Monica Puig-Pey <puigpeym@...can.es> wrote:
> I am writing a driver which has one kernel thread associated with it.
> I want to change the priority of this thread, so that I can specify the
> order in which it is scheduled following an interrupt.
> I'm using:
>
>  sched_setscheduler(struct task_struct *, int, struct sched_param *);
>
> but it doesn't work. I tried to change the priority from the init_module,
> and also from the Kernel Thread, but there is no way.
>
> Kernel version is 2.6.31-11-rt
>
> What do I call to change a kernel thread priority?
>
> Thanks you very much
>
> Mónica
>
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