From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753665Ab2BTPfG (ORCPT ); Mon, 20 Feb 2012 10:35:06 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:50950 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753395Ab2BTPfE (ORCPT ); Mon, 20 Feb 2012 10:35:04 -0500 Date: Mon, 20 Feb 2012 16:34:52 +0100 From: Ingo Molnar To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Andrew Morton , "H. Peter Anvin" , Peter Zijlstra Subject: Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI Message-ID: <20120220153452.GA4962@elte.hu> References: <1329617173.1561.5.camel@acer.local.home> <20120219125601.GD25900@elte.hu> <1329663451.25686.21.camel@gandalf.stny.rr.com> <20120220081045.GD30810@elte.hu> <1329748907.25686.29.camel@gandalf.stny.rr.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1329748907.25686.29.camel@gandalf.stny.rr.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Steven Rostedt wrote: > On Mon, 2012-02-20 at 09:10 +0100, Ingo Molnar wrote: > > > > > > Note, it does not seem to cause any destruction, but screw up > > > profiling. > > > > Except if the source of the NMI was not profiling, right? > > Well, what else are NMIs used for? [...] There's various (legacy) diagnostics NMIs on various x86 platforms, mostly signalling some sort of deep trouble with the hw. Thanks, Ingo