Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031190AbXHMNNO (ORCPT ); Mon, 13 Aug 2007 09:13:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S970058AbXHMIiI (ORCPT ); Mon, 13 Aug 2007 04:38:08 -0400 Received: from il.qumranet.com ([82.166.9.18]:52838 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S970051AbXHMIiF (ORCPT ); Mon, 13 Aug 2007 04:38:05 -0400 Message-ID: <46C01877.7060007@qumranet.com> Date: Mon, 13 Aug 2007 11:38:15 +0300 From: Avi Kivity User-Agent: Thunderbird 2.0.0.0 (X11/20070419) MIME-Version: 1.0 To: Laurent Vivier CC: kvm-devel , linux-kernel , Ingo Molnar , virtualization , Rusty Russell Subject: Re: [kvm-devel] [PATCH 0/2][KVM] guest time accounting References: <46BC8B39.6050202@bull.net> <46C00FC1.1070306@qumranet.com> <46C012A8.2040908@bull.net> In-Reply-To: <46C012A8.2040908@bull.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1313 Lines: 35 Laurent Vivier wrote: >> - perhaps the new fields should be guarded by a #ifdef CONFIG_HYPERVISOR >> (selected by CONFIG_KVM)? that way the (minor) additional overhead is >> only incurred if it can possibly be used. I imagine that our canine >> cousin will want to use this as well. >> > > There is also a CONFIG_VIRTUALIZATION and a CONFIG_VIRT_CPU_ACCOUNTING (from > s390 and powerpc) Which one to use ? > Are these options for using the kernel as a guest or host? I'd guess the former. > I'm wondering if we can have a more accurate accounting: > > - For the moment we add all system time since the previous entering to the VCPU > to the guest time (and I guess there is some real system time in it ???) > > - Perhaps we can sum nanoseconds spent in the VCPU and add it to cpustat when > these ns are greater than 1 ms ? (I'm trying to make something in this way) > I think that it's okay to use the same method as user/system time accounting. But Ingo the the right man to ask. -- 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/