From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755024Ab2GIO5V (ORCPT ); Mon, 9 Jul 2012 10:57:21 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37569 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754219Ab2GIO5T (ORCPT ); Mon, 9 Jul 2012 10:57:19 -0400 Date: Mon, 9 Jul 2012 17:57:14 +0300 From: Gleb Natapov To: Avi Kivity Cc: Peter Zijlstra , David Ahern , LKML Subject: Re: perf with precise attribute kills all KVM based VMs Message-ID: <20120709145714.GF7298@redhat.com> References: <4FFAE6D8.5050609@gmail.com> <20120709141904.GC7298@redhat.com> <1341843844.3462.75.camel@twins> <4FFAED16.7050204@redhat.com> <4FFAEF13.7010108@gmail.com> <1341845396.3462.81.camel@twins> <4FFAEFF1.9000706@redhat.com> <20120709145442.GE7298@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120709145442.GE7298@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 09, 2012 at 05:54:42PM +0300, Gleb Natapov wrote: > On Mon, Jul 09, 2012 at 05:51:29PM +0300, Avi Kivity wrote: > > On 07/09/2012 05:49 PM, Peter Zijlstra wrote: > > > On Mon, 2012-07-09 at 08:47 -0600, David Ahern wrote: > > >> > > >> I found this testing changes to perf-kvm, but found the problem extends > > >> to just perf-record. With perf-record exclude_guest defaults to 1. See > > >> tools/perf/util/util.c, event_attr_init(). > > > > > > You lost me there.. so perf-record defaults to exclude_guest=1 (which > > > would make the proposed patch I just send actually possible), but its > > > still going *bang* ? > > > > It's possible that the DS writes overshoot the MSR... or that there's a > > bug somewhere. > > > I hope it is the later, because we can do nothing with the former. > Actually we can disable DS before guest entry. -- Gleb.