linux-kernel - Re: Changing Kernel thread priorities

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Date:	Mon, 6 Jun 2011 13:58:23 +0200
From:	Monica Puig-Pey <puigpeym@...can.es>
To:	Rolando Martins <rolando.martins@...il.com>
CC:	<linux-rt-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: Changing Kernel thread priorities

El 06/06/11 13:54, Rolando Martins escribió:
> 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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>>

I need to change the priority from inside the driver, when creating the 
kernel thread.
Your script is useful but it is done in user context,
Any other help please?

Mónica


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