Changing real time priority of interrupt handler thread

[Raphael Hertzog <raphael@ouaza.com>]

[ Please cc me on answer, I'm not subscribed to the list, I tried to ask
this question on the #linux-rt channel but got no answers so I try on the
list ]

Hello,

with 2.6.33.2-rt13 the IRQ handler thread for serial devices is
no longer persistent after its creation. Up to now I had a startup
script opening the serial device in order to create the IRQ handler
thread that would run chrt on $(pidof IRQ-4) and the setting would be
persistent until next reboot.

This is no longer possible, I would have to run chrt every time that I
open the serial port and I would like to avoid modifying all my
applications to do this.

Is there any other alternative like making the thread persistent with some
options (/sys or /proc tuning)?

Or is there a kernel config option for this ?

In case it was not clear, I want to run the IRQ handler of the serial
ports at a higher priority than the other ones (like network, disk,
etc.) to avoid buffer overruns.

Cheers,
-- 
Raphaël Hertzog -+- http://www.ouaza.com

Freexian : des développeurs Debian au service des entreprises
http://www.freexian.com
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