Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753692AbZD1TTz (ORCPT ); Tue, 28 Apr 2009 15:19:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752064AbZD1TTp (ORCPT ); Tue, 28 Apr 2009 15:19:45 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:58303 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751056AbZD1TTp (ORCPT ); Tue, 28 Apr 2009 15:19:45 -0400 Date: Tue, 28 Apr 2009 21:18:27 +0200 From: Ingo Molnar To: Steven Rostedt Cc: Linus Torvalds , david@lang.hm, Tejun Heo , Dave Airlie , LKML Subject: Re: kms in defconfig Message-ID: <20090428191827.GA27062@elte.hu> References: <21d7e9970904270121s1c58365bqc8933f8a3ffc5f1a@mail.gmail.com> <20090427083935.GA20941@elte.hu> <21d7e9970904270156v54a6483fs20d5b31c97a1d482@mail.gmail.com> <49F65FA2.4010603@kernel.org> <20090428172226.GA15115@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) 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: 2482 Lines: 69 * Steven Rostedt wrote: > On Tue, 28 Apr 2009, Ingo Molnar wrote: > > > > > * Linus Torvalds wrote: > > > > > So yes, it would be good to automate it: > > > > > > > If a tool was available to detect the hardware and create a > > > > config tailored for the box, this use for a default config would > > > > go away > > > > > > Yeah, I've wished for that. > > > > Steve (Cc:-ed) submitted such a script last year IIRC. It wasnt > > particularly complex. > > I've submitted the script a few times to LKML but it is not > exactly what people want, but is quite useful in the mean time. > > What people want is a script that will analyze their system > devices and enable all the configs that will support them. > > My script requires that you have booted the kernel (or similar > kernel with the same config options and modules). It then runs > lsmod, and searches for the options that enable those modules. It > then reads the current .config file and prints out a new config > that disables all module configs that are not used to enable the > modules found with lsmod. > > Here's the code (perl script): > > http://rostedt.homelinux.com/code/streamline_config.pl > > The instructions on how to use it are at the top of the file. > > This script has brought down my full kernel compile times with > distcc from 50 minutes to under 10. Looks rather useful IMHO. I use the following magic incantation in cfs-debug-info.sh to get to the distro config automatically: KREL=`uname -r | sed 's/smp$//g'` ( cat "`rpm -ql kernel-$KREL 2>/dev/null | grep /boot/config`" cat "`rpm -ql kernel-smp-$KREL 2>/dev/null | grep /boot/config`" cat "`dpkg -L linux-image-$KREL 2>/dev/null | grep /boot/config`" cat /boot/config-$KREL 2>/dev/null ) Works on most .rpm and .deb based distros. (If /proc/config.gz is present that could be added too.) So if this was added as a 'make builtinconfig' kind of shortcut, with no extra steps needed (and if the script bailed out if it cannot find the currently booted .config) - that would be a rather useful (and easy) way to start kernel development on a new box. Useful to newbies and oldbies alike IMHO. 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/