Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754110AbXLBTAg (ORCPT ); Sun, 2 Dec 2007 14:00:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752702AbXLBTAR (ORCPT ); Sun, 2 Dec 2007 14:00:17 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:49150 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754096AbXLBTAP (ORCPT ); Sun, 2 Dec 2007 14:00:15 -0500 Date: Sun, 2 Dec 2007 19:59:45 +0100 From: Ingo Molnar To: Andi Kleen Cc: linux-kernel@vger.kernel.org, Andrew Morton , Arjan van de Ven , Thomas Gleixner Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks Message-ID: <20071202185945.GA25990@elte.hu> References: <20071201092037.GA32544@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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: 1138 Lines: 30 * Andi Kleen wrote: > Ingo Molnar writes: > > > this patch extends the soft-lockup detector to automatically > > detect hung TASK_UNINTERRUPTIBLE tasks. Such hung tasks are > > printed the following way: > > That will likely trigger anytime a hard nfs/cifs mount loses its > server for 120s. To make this work you would need a new > TASK_UNINTERRUPTIBLE_EXTERNAL_EVENT or similar and mark all the places > which depend on those. TASK_KILLABLE should be the right solution i think. > I've also seen kernel modules that use semaphores like wait queues > While that gives a little funny results (high load average) it worked > so far, until this patch. it still works with this patch of course. With a funny results like high load average _AND_ a clear debug message that tells us (and the user) where that high load average comes from. 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/