From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH 0/2][KVM] guest time accounting Date: Mon, 13 Aug 2007 11:38:15 +0300 Message-ID: <46C01877.7060007@qumranet.com> References: <46BC8B39.6050202@bull.net> <46C00FC1.1070306@qumranet.com> <46C012A8.2040908@bull.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel , linux-kernel , virtualization To: Laurent Vivier Return-path: In-Reply-To: <46C012A8.2040908-6ktuUTfB/bM@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org 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 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/