From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762947AbYEHO6t (ORCPT ); Thu, 8 May 2008 10:58:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755055AbYEHO6l (ORCPT ); Thu, 8 May 2008 10:58:41 -0400 Received: from gw.goop.org ([64.81.55.164]:50386 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754344AbYEHO6k (ORCPT ); Thu, 8 May 2008 10:58:40 -0400 Message-ID: <48231518.9010209@goop.org> Date: Thu, 08 May 2008 15:58:32 +0100 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Christian Borntraeger CC: Rusty Russell , kvm-devel@lists.sourceforge.net, Ingo Molnar , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: Re: [PATCH/RFC] stop_machine: make stop_machine_run more virtualization friendly References: <200805081520.38310.borntraeger@de.ibm.com> <48230137.9090705@goop.org> <200805081641.20572.borntraeger@de.ibm.com> In-Reply-To: <200805081641.20572.borntraeger@de.ibm.com> X-Enigmail-Version: 0.95.6 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 Christian Borntraeger wrote: > I really like 64 guest cpus as a good testcase for all kind of things. > Sure, I do the same kind of thing. >> I think x86 (at least) is now using ticket locks, which is fair. Which >> kernel are you seeing this problem on? >> > > Sorry, forgot to mention. Its kvm.git from 2 days ago on s390. > And on s390 cpu_relax yields the vcpu? That's not common behaviour across architectures. J