From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753964AbYIDR3m (ORCPT ); Thu, 4 Sep 2008 13:29:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751002AbYIDR3d (ORCPT ); Thu, 4 Sep 2008 13:29:33 -0400 Received: from casper.infradead.org ([85.118.1.10]:36916 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750822AbYIDR3d (ORCPT ); Thu, 4 Sep 2008 13:29:33 -0400 Date: Thu, 4 Sep 2008 10:29:36 -0700 From: Arjan van de Ven To: Bernd Schubert Cc: linux-kernel@vger.kernel.org Subject: Re: frame unwinder patches Message-ID: <20080904102936.28e10c39@infradead.org> In-Reply-To: References: Organization: Intel X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.11; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 04 Sep 2008 18:46:52 +0200 Bernd Schubert wrote: > Hello, > > up to 2.6.22 the -mm series had these nice frame unwinder patches, > which gave beautiful stack traces. Unfortunately these frame unwinder > patches seem to have been dropped :( > > Anyone still maintaining updated patches? > > Probably all the "?" lines shouldn't be printed. printing the ? lines is the result of a compromise between getting the most reliable information out of a stack trace, and getting a useful data for the case where not everything is going as well as it should. not printing the ? would be trivial (for some backtraces we do that), but so far hasn't been seen as desirable because you lose information in those hard-to-debug cases when you need anything you can get from the backtrace. -- If you want to reach me at my work email, use arjan@linux.intel.com For development, discussion and tips for power savings, visit http://www.lesswatts.org