From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754775AbZFXHDc (ORCPT ); Wed, 24 Jun 2009 03:03:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753003AbZFXHDS (ORCPT ); Wed, 24 Jun 2009 03:03:18 -0400 Received: from one.firstfloor.org ([213.235.205.2]:57459 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753746AbZFXHDQ (ORCPT ); Wed, 24 Jun 2009 03:03:16 -0400 Date: Wed, 24 Jun 2009 09:03:15 +0200 From: Andi Kleen To: David Miller Cc: andi@firstfloor.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org Subject: Re: NMI watchdog + NOHZ question Message-ID: <20090624070315.GH6760@one.firstfloor.org> References: <20090622.002722.53993293.davem@davemloft.net> <87bpog3clx.fsf@basil.nowhere.org> <20090622.022752.219499742.davem@davemloft.net> <20090623.171735.154729801.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090623.171735.154729801.davem@davemloft.net> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > I'm not exactly sure what to do about this. Ack the timer interrupt earlier (and also give it a high priority?) That could be still problematic if you have non nestabled irq stacks (haven't checked if sparc has that or not), potentially you might need to run the softirq on the process stack. -Andi -- ak@linux.intel.com -- Speaking for myself only.