Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752593AbZJGVJm (ORCPT ); Wed, 7 Oct 2009 17:09:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752439AbZJGVJl (ORCPT ); Wed, 7 Oct 2009 17:09:41 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45215 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752417AbZJGVJk (ORCPT ); Wed, 7 Oct 2009 17:09:40 -0400 Message-ID: <4ACD0333.9060603@redhat.com> Date: Wed, 07 Oct 2009 23:08:03 +0200 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3 MIME-Version: 1.0 To: Dan Magenheimer CC: Jeremy Fitzhardinge , Jeremy Fitzhardinge , Xen-devel , kurt.hackel@oracle.com, the arch/x86 maintainers , Linux Kernel Mailing List , Glauber de Oliveira Costa , Keir Fraser , zach.brown@oracle.com, chris.mason@oracle.com Subject: Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 808 Lines: 21 On 10/07/2009 10:48 PM, Dan Magenheimer wrote: >> We can support them by falling back to the kernel. I'm a bit worried >> about the kernel playing with the hypervisor's version field. It's >> better to introduce yet a new version for the kernel, and check both. >> > On Nehalem, apps that need timestamp information at a high > frequency will likely use rdtsc/rdtscp directly. > > Then they will get incorrect timing once they are live migrated. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/