From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752944Ab1HDIh3 (ORCPT ); Thu, 4 Aug 2011 04:37:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:15545 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752475Ab1HDIhX (ORCPT ); Thu, 4 Aug 2011 04:37:23 -0400 Message-ID: <4E3A5A38.9080406@redhat.com> Date: Thu, 04 Aug 2011 11:37:12 +0300 From: Dor Laor Reply-To: dlaor@redhat.com User-Agent: Mozilla/5.0 (X11; Linux i686; rv:5.0) Gecko/20110707 Thunderbird/5.0 MIME-Version: 1.0 To: Eric B Munson CC: kvm@vger.kernel.org, kvm-ia64@vger.kernel.org, kvm-ppc@vger.kernel.org, avi@redhat.com, riel@redhat.com, glommer@redhat.com, linux-kernel@vger.kernel.org, aliguori@us.ibm.com, raharper@us.ibm.com, Glauber Costa Subject: Re: [RFC PATCH 0/3] Avoid soft lockup message when KVM is stopped by host References: <1312381501-27746-1-git-send-email-emunson@mgebm.net> In-Reply-To: <1312381501-27746-1-git-send-email-emunson@mgebm.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/03/2011 05:24 PM, Eric B Munson wrote: > This set is just a rough first pass at avoiding soft lockup warnings when a host > pauses the execution of a guest. A flag is set by the host in the shared page > used for the pvclock when the host goes to stop the guest. When the guest > resumes and detects a soft lockup, this flag is checked and cleared and the soft > lockup message is skipped. While this will cover the case were the host stops a guest, there will be other plain cases where the host is just over committed and will cause a softlockup false positive on the guest. Softlockup should use stolen time that makes use of the guest running info would cover both cases > > This currently breaks the build for non-x86 architectures but part of what I am > looking for here is how to go about adding the function stubs for everything > else. > > Eric B Munson (3): > Add flag to indicate that a vm was stopped by the host > Add functions to check if the host has stopped the vm > Add check for suspended vm in softlockup detector > > arch/x86/include/asm/pvclock-abi.h | 1 + > arch/x86/include/asm/pvclock.h | 3 +++ > arch/x86/kernel/kvmclock.c | 12 ++++++++++++ > kernel/watchdog.c | 11 +++++++++++ > 4 files changed, 27 insertions(+), 0 deletions(-) >