From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S271188AbTGWSbq (ORCPT ); Wed, 23 Jul 2003 14:31:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S271199AbTGWSbq (ORCPT ); Wed, 23 Jul 2003 14:31:46 -0400 Received: from adsl-110-19.38-151.net24.it ([151.38.19.110]:46808 "HELO develer.com") by vger.kernel.org with SMTP id S271188AbTGWSbo (ORCPT ); Wed, 23 Jul 2003 14:31:44 -0400 From: Bernardo Innocenti Organization: Develer S.r.l. To: uClinux development list Subject: Kernel 2.6 size increase Date: Wed, 23 Jul 2003 20:46:46 +0200 User-Agent: KMail/1.5.9 Cc: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Message-Id: <200307232046.46990.bernie@develer.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, code bloat can be very harmful on embedded targets, but it's generally inconvenient for any platform. I've measured the code increase between 2.4.21 and 2.6.0-test1 on a small kernel configuration for ColdFire: text data bss dec hex filename 640564 39152 134260 813976 c6b98 linux-2.4.x/linux 845924 51204 78896 976024 ee498 linux-2.5.x/vmlinux I could provide the exact .config file for both kernels to anybody interested. They are almost the same: no filesystems except JFFS2, IPv4 and a bunch of small drivers. I have no SMP, security, futexes, modules and anything else not strictly needed to execute processes. I've made a linker map file and compared the size of single subsystems. These are the the major contributors to the size increase: kernel/ +27KB mm/ +14KB fs/ +47KB drivers/ +35KB net/ +64KB I've digged into net/ with nm -S --size-sort. It seems that the major increase is caused by net/xfrm/. Could this module be made optional? In fs/, almost all modules have got 30-40% bigger, therefore bloat is probably caused by inlines and macros getting more complex. Block drivers and MTD have generally become smaller. Character devices are responsable for most of the size increase in drivers/. -- // Bernardo Innocenti - Develer S.r.l., R&D dept. \X/ http://www.develer.com/ Please don't send Word attachments - http://www.gnu.org/philosophy/no-word-attachments.html