Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752848AbXLCN4W (ORCPT ); Mon, 3 Dec 2007 08:56:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752833AbXLCN4P (ORCPT ); Mon, 3 Dec 2007 08:56:15 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:46581 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752711AbXLCN4P (ORCPT ); Mon, 3 Dec 2007 08:56:15 -0500 Date: Mon, 3 Dec 2007 14:55:47 +0100 From: Ingo Molnar To: Andi Kleen Cc: 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: <20071203135547.GA4245@elte.hu> References: <20071203103815.GA2707@elte.hu> <20071203110412.GD28560@one.firstfloor.org> <20071203115900.GB8432@elte.hu> <20071203121357.GB2986@one.firstfloor.org> <20071203122833.GA20232@elte.hu> <20071203124144.GC2986@one.firstfloor.org> <20071203130003.GA26372@elte.hu> <20071203131442.GA4004@one.firstfloor.org> <20071203132955.GA31354@elte.hu> <20071203134801.GB4004@one.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071203134801.GB4004@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: 903 Lines: 30 * Andi Kleen wrote: > I would still appreciate if you could state what default value you > plan to set the backtrace sysctl to in the submitted patch. there's no "backtrace sysctl" planned for the moment. This "hung tasks" debugging feature can be disabled/enabled on a wide scale already: - in the .config - runtime, temporarily, via: echo 0 > /proc/sys/kernel/hung_task_timeout_secs - runtime, permanently, via adding: kernel.hung_task_timeout_secs = 0 to /etc/sysctl.conf. the backtrace, as other posters have stated it in this thread too, is very useful, so i'll not remove it from the printout. 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/