Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754862AbXLCN6R (ORCPT ); Mon, 3 Dec 2007 08:58:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752379AbXLCN6H (ORCPT ); Mon, 3 Dec 2007 08:58:07 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:37655 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750713AbXLCN6E (ORCPT ); Mon, 3 Dec 2007 08:58:04 -0500 Date: Mon, 3 Dec 2007 14:57:41 +0100 From: Ingo Molnar To: Pekka Enberg Cc: Andi Kleen , Radoslaw Szkodzinski , Arjan van de Ven , linux-kernel@vger.kernel.org, Andrew Morton , Thomas Gleixner Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks Message-ID: <20071203135741.GB4245@elte.hu> References: <20071203000741.GB26636@one.firstfloor.org> <20071202165913.3eaebee6@laptopd505.fenrus.org> <20071203095501.GB28560@one.firstfloor.org> <20071203111520.33ed2139@astralstorm.puszkin.org> <20071203102715.GC28560@one.firstfloor.org> <20071203103815.GA2707@elte.hu> <20071203110412.GD28560@one.firstfloor.org> <20071203115900.GB8432@elte.hu> <20071203121357.GB2986@one.firstfloor.org> <84144f020712030550x1cb4dac7q8eeb111f7784590d@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <84144f020712030550x1cb4dac7q8eeb111f7784590d@mail.gmail.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian 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 Content-Length: 1032 Lines: 27 * Pekka Enberg wrote: > Hi, > > On Mon, Dec 03, 2007 at 12:59:00PM +0100, Ingo Molnar wrote: > > > "audit thousands of callsites in 8 million lines of code first" is a > > > nice euphemism for hiding from the blame forever. We had 10 years for it > > On Dec 3, 2007 2:13 PM, Andi Kleen wrote: > > Ok your approach is then to "let's warn about it and hope > > it will go away" > > It's more like "lets warn about it and fix the problems when we find > some." Btw, how is this different from how the lockdep patches went > in? yeah, it's quite similar. (in fact this feature is expected to have a false positive rate lower than that of lockdep) The backtraces are essential as well, they help kernel developer find the bugs. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/