From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Torsten Kaiser" Subject: Re: [PATCH] Force UNIX domain sockets to be built in Date: Mon, 31 Dec 2007 16:55:57 +0100 Message-ID: <64bb37e0712310755k2446e67eq81d31cd476eb75e3@mail.gmail.com> References: <20071231122419.GA13803@does.not.exist> <20071231144255.GB13803@does.not.exist> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "Bodo Eggert" <7eggert@gmx.de>, "Jan Engelhardt" , devzero@web.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: "Adrian Bunk" Return-path: Received: from py-out-1112.google.com ([64.233.166.179]:54944 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750944AbXLaPz5 (ORCPT ); Mon, 31 Dec 2007 10:55:57 -0500 Received: by py-out-1112.google.com with SMTP id u52so9074933pyb.10 for ; Mon, 31 Dec 2007 07:55:57 -0800 (PST) In-Reply-To: <20071231144255.GB13803@does.not.exist> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: On Dec 31, 2007 3:42 PM, Adrian Bunk wrote: > With CONFIG_MODULES=y the 13 EXPORT_SYMBOL's that only exist for the > theoretical possibility of CONIG_UNIX=m waste a few hundred bytes > of memory. One thing I always wondered about in this discussion about wasted EXPORT_SYMBOL's: Shouldn't it be possible to garbage collect these? depmod already contains code to analyze all modules to create a dependency tree. It should not be too difficult to extend it to create a list of all symbols that really are used by the current modules. Everything else could be stripped to save space. The problem with that: * out-of-tree modules would break if they don't get lucky to only use the remaining symbol. I would not see this as a problem, if the help text of the garbage-collect-option would contain a note like "don't enable this if you want out-of-tree modules". * if you later change your .config to include additional modules you might need to rebuild vmlinux and reboot into the new kernel. Currently you can probably build and load new modules without a reboot. (for example: usb drivers) Torsten