From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932242AbbBBE6z (ORCPT ); Sun, 1 Feb 2015 23:58:55 -0500 Received: from mail-pa0-f46.google.com ([209.85.220.46]:63848 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752423AbbBBE6v (ORCPT ); Sun, 1 Feb 2015 23:58:51 -0500 Message-ID: <1422853118.2863.1.camel@cyril> Subject: Re: [PATCH v2 0/2] Quieten softlockup detector on virtualised kernels From: Cyril Bur To: Andrew Morton 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 Date: Mon, 02 Feb 2015 15:58:38 +1100 In-Reply-To: <1420774478-16760-1-git-send-email-cyrilbur@gmail.com> References: <1420774478-16760-1-git-send-email-cyrilbur@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andrew, Could you please pick these patches up through your tree? Thanks, Cyril 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. > > V2: > Remove the export of running_clock > Added #ifdef CONFIG_PPC_PSERIES and optimised the non lpar + vtb cases. > Replaced the use of sched_clock_with local_clock it was used originally in > the softlockup detector. > > Cyril Bur (2): > Add another clock for use with the soft lockup watchdog. > powerpc: add running_clock for powerpc to prevent spurious softlockup > warnings > > arch/powerpc/kernel/time.c | 32 ++++++++++++++++++++++++++++++++ > include/linux/sched.h | 1 + > kernel/sched/clock.c | 13 +++++++++++++ > kernel/watchdog.c | 2 +- > 4 files changed, 47 insertions(+), 1 deletion(-) >