From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755577AbYDRIIq (ORCPT ); Fri, 18 Apr 2008 04:08:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753163AbYDRII2 (ORCPT ); Fri, 18 Apr 2008 04:08:28 -0400 Received: from one.firstfloor.org ([213.235.205.2]:52144 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753333AbYDRII0 (ORCPT ); Fri, 18 Apr 2008 04:08:26 -0400 Message-ID: <480856BD.3080903@firstfloor.org> Date: Fri, 18 Apr 2008 10:07:25 +0200 From: Andi Kleen User-Agent: Thunderbird 2.0.0.6 (X11/20070801) MIME-Version: 1.0 To: Mathieu Desnoyers CC: mingo@elte.hu, akpm@osdl.org, "H. Peter Anvin" , Jeremy Fitzhardinge , Steven Rostedt , "Frank Ch. Eigler" , linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v5) References: <20080417165839.GA25198@Krystal> <20080417165944.GB25198@Krystal> <20080417201410.GB31616@Krystal> <87od889m44.fsf@basil.nowhere.org> <20080418000634.GB5062@Krystal> In-Reply-To: <20080418000634.GB5062@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: > * Andi Kleen (andi@firstfloor.org) wrote: >> Mathieu Desnoyers writes: >>> It allows placing immediate values (and therefore optimized trace_marks) in NMI >>> code >> Only if all your trace_mark infrastructure is lock less. >> >> -Andi >> > > It uses RCU-style updates and has been designed to be lockless from the > ground up. Wrong. If it causes vmalloc faults it is not lockless. -Andi