From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762211AbZFOWlK (ORCPT ); Mon, 15 Jun 2009 18:41:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755303AbZFOWkt (ORCPT ); Mon, 15 Jun 2009 18:40:49 -0400 Received: from terminus.zytor.com ([198.137.202.10]:54955 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761050AbZFOWks (ORCPT ); Mon, 15 Jun 2009 18:40:48 -0400 Message-ID: <4A36CCFC.8070908@zytor.com> Date: Mon, 15 Jun 2009 15:36:44 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.21 (X11/20090320) MIME-Version: 1.0 To: Mathieu Desnoyers CC: Ingo Molnar , Peter Zijlstra , Linus Torvalds , mingo@redhat.com, paulus@samba.org, acme@redhat.com, linux-kernel@vger.kernel.org, penberg@cs.helsinki.fi, vegard.nossum@gmail.com, efault@gmx.de, jeremy@goop.org, npiggin@suse.de, tglx@linutronix.de, linux-tip-commits@vger.kernel.org Subject: Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods References: <4A369CD8.3090505@zytor.com> <20090615192720.GA9056@Krystal> <4A36A1C7.6080005@zytor.com> <20090615210119.GD24554@elte.hu> <20090615211207.GB12919@Krystal> <20090615211605.GC27100@elte.hu> <20090615213429.GD12919@Krystal> <4A36BF61.10901@zytor.com> <20090615215420.GE12919@Krystal> <4A36C953.8060906@zytor.com> <20090615223038.GA15903@Krystal> In-Reply-To: <20090615223038.GA15903@Krystal> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mathieu Desnoyers wrote: > > I'm just thinking that touching or not vmalloc'd areas should not be the > first thing that comes into the mind of someone willing to write a > nmi-hooking tracer or oprofile module. > But is HAS to be. Otherwise you're in deadlock city anyway. -hpa