Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754765AbZJ2PH4 (ORCPT ); Thu, 29 Oct 2009 11:07:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754464AbZJ2PHz (ORCPT ); Thu, 29 Oct 2009 11:07:55 -0400 Received: from mx1.redhat.com ([209.132.183.28]:22192 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754462AbZJ2PHz (ORCPT ); Thu, 29 Oct 2009 11:07:55 -0400 Message-ID: <4AE9AFAE.5020306@redhat.com> Date: Thu, 29 Oct 2009 17:07:26 +0200 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.4pre) Gecko/20091014 Fedora/3.0-2.8.b4.fc11 Thunderbird/3.0b4 MIME-Version: 1.0 To: Dan Magenheimer CC: Jeremy Fitzhardinge , Glauber Costa , Jeremy Fitzhardinge , kurt.hackel@oracle.com, the arch/x86 maintainers , Linux Kernel Mailing List , Glauber de Oliveira Costa , Xen-devel , Keir Fraser , zach.brown@oracle.com, chris.mason@oracle.com, Ingo Molnar Subject: Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation References: <6137c066-3dfd-49dd-bbf2-7718f8542958@default> In-Reply-To: <6137c066-3dfd-49dd-bbf2-7718f8542958@default> Content-Type: text/plain; charset=windows-1252; 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: 973 Lines: 22 On 10/29/2009 04:46 PM, Dan Magenheimer wrote: > No, the apps I'm familiar with (a DB and a JVM) need a timestamp > not a monotonic counter. The timestamps must be relatively > accurate (e.g. we've been talking about gettimeofday generically, > but these apps would use clock_gettime for nsec resolution), > monotonically increasing, and work properly across a VM > migration. The timestamps are taken up to a 100K/sec or > more so the apps need to ensure they are using the fastest > mechanism available that meets those requirements. > Out of interest, do you know (and can you relate) why those apps need 100k/sec monotonically increasing timestamps? -- error compiling committee.c: too many arguments to function -- 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/