From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933618AbbBBXIo (ORCPT ); Mon, 2 Feb 2015 18:08:44 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:35343 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751854AbbBBXIl (ORCPT ); Mon, 2 Feb 2015 18:08:41 -0500 Date: Mon, 2 Feb 2015 15:08:39 -0800 From: Andrew Morton To: Cyril Bur Cc: mpe@ellerman.id.au, drjones@redhat.com, dzickus@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, uobergfe@redhat.com, chaiw.fnst@cn.fujitsu.com, fabf@skynet.be, atomlin@redhat.com, benzh@chromium.org, schwidefsky@de.ibm.com Subject: Re: [PATCH v2 0/2] Quieten softlockup detector on virtualised kernels Message-Id: <20150202150839.30174a1313e83d1708ace4fc@linux-foundation.org> In-Reply-To: <1422853118.2863.1.camel@cyril> References: <1420774478-16760-1-git-send-email-cyrilbur@gmail.com> <1422853118.2863.1.camel@cyril> X-Mailer: Sylpheed 3.4.1 (GTK+ 2.24.23; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 02 Feb 2015 15:58:38 +1100 Cyril Bur wrote: > On Fri, 2015-01-09 at 14:34 +1100, Cyril Bur wrote: > > When the hypervisor pauses a virtualised kernel the kernel will observe a jump > > in timebase, this can cause spurious messages from the softlockup detector. > > > > Whilst these messages are harmless, they are accompanied with a stack trace > > which causes undue concern and more problematically the stack trace in the > > guest has nothing to do with the observed problem and can only be misleading. > > > > Futhermore, on POWER8 this is completely avoidable with the introduction of > > the Virtual Time Base (VTB) register. > > (Top-posting repaired. Please don't). > Could you please pick these patches up through your tree? I shall. There were quite a few review comments last time and I *think* they've been addressed(?). I'll cc the involved parties on the commits - please check?