From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753414Ab2CLKer (ORCPT ); Mon, 12 Mar 2012 06:34:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:12723 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751106Ab2CLKep (ORCPT ); Mon, 12 Mar 2012 06:34:45 -0400 Message-ID: <4F5DD140.7040605@redhat.com> Date: Mon, 12 Mar 2012 12:34:40 +0200 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 MIME-Version: 1.0 To: Davidlohr Bueso CC: Marcelo Tosatti , lkml , KVM Subject: Re: [PATCH] KVM: VMX: add tracepoint for vpids References: <1331481472.17316.1.camel@offbook> <4F5DB245.9060205@redhat.com> <1331551781.1334.3.camel@offworld> In-Reply-To: <1331551781.1334.3.camel@offworld> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/12/2012 01:29 PM, Davidlohr Bueso wrote: > On Mon, 2012-03-12 at 10:22 +0200, Avi Kivity wrote: > > On 03/11/2012 05:57 PM, Davidlohr Bueso wrote: > > > From: Davidlohr Bueso > > > > > > Add a new tracepoint for vpid allocation and freeing associated to all vCPUs. > > > > > > > Why? > > > > We have been using this tracepoint for some time now to help debug vpids > and simulating tagged TLB behavior and performance. This gets to be non > trivial when working with large amounts of guests and vCPUs. I don't follow. Can you give an example of when this tracepoint would be useful? -- error compiling committee.c: too many arguments to function