Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751236AbWHIRkW (ORCPT ); Wed, 9 Aug 2006 13:40:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751268AbWHIRkW (ORCPT ); Wed, 9 Aug 2006 13:40:22 -0400 Received: from mx1.redhat.com ([66.187.233.31]:19334 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1751236AbWHIRkV (ORCPT ); Wed, 9 Aug 2006 13:40:21 -0400 Date: Wed, 9 Aug 2006 13:38:30 -0400 From: Dave Jones To: Kirill Korotaev Cc: Alan Cox , Muli Ben-Yehuda , =?iso-8859-1?Q?Bj=F6rn?= Steinbrink , linux-kernel@vger.kernel.org, dev@openvz.org, stable@kernel.org Subject: Re: + sys_getppid-oopses-on-debug-kernel.patch added to -mm tree Message-ID: <20060809173830.GA10930@redhat.com> Mail-Followup-To: Dave Jones , Kirill Korotaev , Alan Cox , Muli Ben-Yehuda , =?iso-8859-1?Q?Bj=F6rn?= Steinbrink , linux-kernel@vger.kernel.org, dev@openvz.org, stable@kernel.org References: <200608081432.k78EWprf007511@shell0.pdx.osdl.net> <20060808143937.GA3953@rhun.haifa.ibm.com> <20060808145138.GA2720@atjola.homenet> <20060808145709.GB3953@rhun.haifa.ibm.com> <1155050547.5729.91.camel@localhost.localdomain> <44D8B048.8060103@sw.ru> <20060808163635.GF28990@redhat.com> <44D99901.20202@sw.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <44D99901.20202@sw.ru> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1230 Lines: 29 On Wed, Aug 09, 2006 at 12:12:49PM +0400, Kirill Korotaev wrote: > > > >>Even without getting into just how ugly this is, is it really worth > > > >>it? > > > it is impossible to run debug kernels w/o this patch :/ > > > or are you asking whether this optimization worth it? > > > > > > What makes me worry is that this is a sign that vendors > > > don't even bother to run debug kernels :(((( > > > > Fedora rawhide is nearly always shipping with DEBUG_SLAB enabled, > > and we didn't hit this once. Are you sure this is a problem > > with DEBUG_SLAB, and not DEBUG_PAGEALLOC ? > Sorry, it's my fault. Surely, CONFIG_DEBUG_PAGEALLOC. Then you're correct, vendors rarely turn this on :) I do sometimes if I'm trying to chase down something particularly difficult, and it usually gets me a bunch of mail from users asking why 'everything got all slow', so it's a last-resort option rather than a 'on all the time' option. Dave -- http://www.codemonkey.org.uk - 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/