From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Buesch Subject: Re: [PATCH] Force UNIX domain sockets to be built in Date: Mon, 31 Dec 2007 16:59:14 +0100 Message-ID: <200712311659.14847.mb@bu3sch.de> References: <20071231144255.GB13803@does.not.exist> <64bb37e0712310755k2446e67eq81d31cd476eb75e3@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: "Adrian Bunk" , "Bodo Eggert" <7eggert@gmx.de>, "Jan Engelhardt" , devzero@web.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: "Torsten Kaiser" Return-path: Received: from vs166246.vserver.de ([62.75.166.246]:50783 "EHLO vs166246.vserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750790AbXLaQAY (ORCPT ); Mon, 31 Dec 2007 11:00:24 -0500 In-Reply-To: <64bb37e0712310755k2446e67eq81d31cd476eb75e3@mail.gmail.com> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: On Monday 31 December 2007 16:55:57 Torsten Kaiser wrote: > 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) I'd say the practical advantage to the user would be almost zero. Which distribution is going to enable this option and defacto banning external modules? -- Greetings Michael.