From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261366AbVGQUEl (ORCPT ); Sun, 17 Jul 2005 16:04:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261367AbVGQUEl (ORCPT ); Sun, 17 Jul 2005 16:04:41 -0400 Received: from mail.metronet.co.uk ([213.162.97.75]:35543 "EHLO mail.metronet.co.uk") by vger.kernel.org with ESMTP id S261366AbVGQUEk (ORCPT ); Sun, 17 Jul 2005 16:04:40 -0400 From: Alistair John Strachan To: Michal Schmidt Subject: Re: rt-preempt and x86_64? Date: Sun, 17 Jul 2005 21:04:40 +0100 User-Agent: KMail/1.8.1 Cc: Ingo Molnar , linux-kernel@vger.kernel.org References: <200507171346.11377.s0348365@sms.ed.ac.uk> <42DA8779.3020005@stud.feec.vutbr.cz> In-Reply-To: <42DA8779.3020005@stud.feec.vutbr.cz> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200507172104.40073.s0348365@sms.ed.ac.uk> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sunday 17 Jul 2005 17:29, Michal Schmidt wrote: > Alistair John Strachan wrote: > > Hi Ingo, > > > > (I searched the list for rt realtime x86_64 x86-64 before posting this, > > so I hope it's not a duplicate). > > > > I've noticed -31 compiles without notable error or warning on x86-64, so > > I thought maybe it was a valid time to file a bug report about it not > > working. > > > > The machine currently runs 2.6.12 but when booting with PREEMPT_RT mode > > on the same machine I get: > > > > init[1]: segfault at ffffffff8010e9c4 rip ffffffff8010e9c4 rsp > > 00007fffffe28018 > > [...] > > Do you have latency tracing enabled in the kernel config? Try disabling > it. It's a known problem that it doesn't work on x86_64. > Thanks Michal, this was the problem. Unless x86_64 is going to receive an implementation of LATENCY_TRACE soon, it might be an idea to only let this be selectable on x86. (Unfortunately I couldn't use the resulting kernel anyway, as my lirc modules hang the system when modprobe'd; it's probably easy even for me to fix if I inspect Ingo's rt-preempt patch.) -- Cheers, Alistair. 'No sense being pessimistic, it probably wouldn't work anyway.' Third year Computer Science undergraduate. 1F2 55 South Clerk Street, Edinburgh, UK.