From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751746Ab0CQAmg (ORCPT ); Tue, 16 Mar 2010 20:42:36 -0400 Received: from mx1.redhat.com ([209.132.183.28]:8538 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751553Ab0CQAme (ORCPT ); Tue, 16 Mar 2010 20:42:34 -0400 Date: Tue, 16 Mar 2010 20:41:36 -0400 From: "Frank Ch. Eigler" To: Anthony Liguori Cc: Ingo Molnar , Avi Kivity , "Zhang, Yanmin" , Peter Zijlstra , Sheng Yang , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Marcelo Tosatti , oerg Roedel , Jes Sorensen , Gleb Natapov , Zachary Amsden , ziteng.huang@intel.com Subject: Re: [PATCH] Enhance perf to collect KVM guest os statistics from host side Message-ID: <20100317004136.GC17472@redhat.com> References: <20100316130840.GA24808@elte.hu> <4B9F84C0.70706@redhat.com> <20100316133114.GB575@elte.hu> <20100316155221.GA19699@elte.hu> <4B9FC11A.1070507@linux.vnet.ibm.com> <20100316175243.GC23859@elte.hu> <4B9FC8B2.6070404@linux.vnet.ibm.com> <20100316182809.GA26602@elte.hu> <4BA00E6A.7080903@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4BA00E6A.7080903@linux.vnet.ibm.com> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi - On Tue, Mar 16, 2010 at 06:04:10PM -0500, Anthony Liguori wrote: > [...] > The only way to really address this is to change the interaction. > Instead of running perf externally to qemu, we should support a perf > command in the qemu monitor that can then tie directly to the perf > tooling. That gives us the best possible user experience. To what extent could this be solved with less crossing of isolation/abstraction layers, if the perfctr facilities were properly virtualized? That way guests could run perf goo internally. Optionally virt tools on the host side could aggregate data from cooperating self-monitoring guests. - FChE