From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261183AbVF3NMo (ORCPT ); Thu, 30 Jun 2005 09:12:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262608AbVF3NMo (ORCPT ); Thu, 30 Jun 2005 09:12:44 -0400 Received: from postfix4-2.free.fr ([213.228.0.176]:32901 "EHLO postfix4-2.free.fr") by vger.kernel.org with ESMTP id S261183AbVF3NMm (ORCPT ); Thu, 30 Jun 2005 09:12:42 -0400 Message-ID: <1120137161.42c3efc93b36c@imp1-q.free.fr> Date: Thu, 30 Jun 2005 15:12:41 +0200 From: eric.valette@free.fr To: Greg KH Cc: Linus Torvalds , linux-kernel@vger.kernel.org Subject: Re: updating kernel to 2.6.13-rc1 from 2.6.12 + CONFIG_DEVFS_FS + empty /dev References: <42C30CBC.5030704@free.fr> <20050629224040.GB18462@kroah.com> In-Reply-To: <20050629224040.GB18462@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT User-Agent: Internet Messaging Program (IMP) 3.2.5 X-Originating-IP: 193.49.124.107 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Quoting Greg KH : > On Wed, Jun 29, 2005 at 11:03:56PM +0200, Eric Valette wrote: > > For years now my /dev has been empty. When upgrading to 2.6.13-rc1 from > > 2.6.12, and updating my kernel config file via "make oldconfig" I got no > > visible warning about CONFIG_DEVFS_FS options being set (or at least did > > no see it). > > devfs has been marked OBSOLETE for a year now. It has also been > documented as going away. Because of this, you should not have been > supprised at all. I knew it! I just the announce for 2.6.13-rc1 did not contain this fact and I did not realize booting this new kernel will fail on my machine which is bad for a stable serie. > What are the speed differences that you see? I've tested it and on a > slow old laptop, with a lot of devices, udev only takes 2 seconds to > initialize the whole device tree. If you put it in initramfs, it will > take no additional time, as it will operate on all of the hotplug events > as they happen. Can't get faster than "nothing" :) If I already have every device in /dev, I do not need udev and yes it is fast :-) This is exactly what I did to boot my system again. Just via devfs, I do not need an initial filesystem nor need anything in user space to boot a full system which I like. -- eric