From mboxrd@z Thu Jan 1 00:00:00 1970 From: Raphael Hertzog Subject: Changing real time priority of interrupt handler thread Date: Wed, 5 May 2010 15:08:45 +0200 Message-ID: <20100505130845.GA9118@rivendell> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: QUOTED-PRINTABLE To: linux-rt-users@vger.kernel.org Return-path: Received: from arrakeen.ouaza.com ([212.85.152.62]:51346 "EHLO arrakeen.ouaza.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934725Ab0EENTE (ORCPT ); Wed, 5 May 2010 09:19:04 -0400 Received: from localhost (localhost [127.0.0.1]) by arrakeen.ouaza.com (Postfix) with ESMTP id E337F332B7 for ; Wed, 5 May 2010 15:09:10 +0200 (CEST) Received: from arrakeen.ouaza.com ([127.0.0.1]) by localhost (arrakeen.ouaza.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id imhJwtqrGCj1 for ; Wed, 5 May 2010 15:09:10 +0200 (CEST) Received: from soleymieux.ouaza.com (soleymieux.ouaza.com [78.225.60.32]) by arrakeen.ouaza.com (Postfix) with ESMTPA id B4817331A4 for ; Wed, 5 May 2010 15:09:10 +0200 (CEST) Content-Disposition: inline Sender: linux-rt-users-owner@vger.kernel.org List-ID: [ Please cc me on answer, I'm not subscribed to the list, I tried to as= k this question on the #linux-rt channel but got no answers so I try on t= he 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 s= ome 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, --=20 Rapha=EBl Hertzog -+- http://www.ouaza.com =46reexian : des d=E9veloppeurs Debian au service des entreprises http://www.freexian.com -- To unsubscribe from this list: send the line "unsubscribe linux-rt-user= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html