Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756166AbXLBVYg (ORCPT ); Sun, 2 Dec 2007 16:24:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754300AbXLBVY3 (ORCPT ); Sun, 2 Dec 2007 16:24:29 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:34493 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754130AbXLBVY2 (ORCPT ); Sun, 2 Dec 2007 16:24:28 -0500 Date: Sun, 2 Dec 2007 22:24:07 +0100 From: Ingo Molnar To: Andi Kleen Cc: Arjan van de Ven , linux-kernel@vger.kernel.org, Andrew Morton , Thomas Gleixner Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks Message-ID: <20071202212407.GA11358@elte.hu> References: <20071201092037.GA32544@elte.hu> <20071202185945.GA25990@elte.hu> <20071202114152.3bf4332d@laptopd505.fenrus.org> <20071202200953.GA23994@one.firstfloor.org> <20071202202602.GA16480@elte.hu> <20071202204725.GA25891@one.firstfloor.org> <20071202211027.GA32282@elte.hu> <20071202211925.GA26414@one.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071202211925.GA26414@one.firstfloor.org> 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: 1079 Lines: 24 * Andi Kleen wrote: > On Sun, Dec 02, 2007 at 10:10:27PM +0100, Ingo Molnar wrote: > > what if you considered - just for a minute - the possibility of this > > debug tool being the thing that actually animates developers to fix such > > long delay bugs that have bothered users for almost a decade meanwhile? > > Throwing frequent debugging messages for non buggy cases will just > lead to people generally ignore softlockups. do you realize that more than 120 seconds TASK_UNINTERRUPTIBLE _is_ something that most humans consider as "buggy" in the overwhelming majority of cases, regardless of the reason? Yes, there are and will be some exceptions, but not nearly as countless as you try to paint it. A quick test in the next -mm will give us a good idea about the ratio of false positives. 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/