From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bernd Petrovitsch Subject: Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c - bisected Date: Wed, 27 Aug 2008 10:44:12 +0200 Message-ID: <1219826652.30209.12.camel@spike.firmix.at> References: <20080826183051.GB10925@cs181140183.pp.htv.fi> <20080826205916.GB11734@cs181140183.pp.htv.fi> <48B4A577.3020303@snapgear.com> <48B4AE68.4040205@snapgear.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Disposition: inline Sender: linux-embedded-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: Parag Warudkar Cc: Greg Ungerer , Linus Torvalds , Adrian Bunk , Rusty Russell , "Alan D. Brunelle" , "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Andrew Morton , Arjan van de Ven , Ingo Molnar , linux-embedded@vger.kernel.org On Tue, 2008-08-26 at 22:16 -0400, Parag Warudkar wrote: [...] > Well, sure - but the industry as a whole seems to have gone the other "The industry as a whole" doesn't exist on that low level. You can't compare the laptop and/or desktop computer market (where one may buy today hardware that runs in 3 years with the next generation/release of the OS and applications) with the e.g. "WLAN router" market where - from the commercial point of view - every Euro counts (and where the requirements for the lifetime of the device are long frozen before the thing gets in a shop). > way - do more with more at the similar or lower price points! > By that definition of less is better we should try and make the kernel > memory pageable (or has someone already done that?) - Windows does it, That doesn't help as in really small devices (like WLAN routers, cable modems, etc.) you run without any means of paging/swapping. And even binaries/read-only files are not necessarily executable in place (but must be loaded into RAM). So you can't flush these pages. And pageable kernel memory doesn't come for free - even if one only counts the increased code and it's complexity. > by default ;) Which is more a sign that it is probably a very bad idea. Bernd -- Firmix Software GmbH http://www.firmix.at/ mobil: +43 664 4416156 fax: +43 1 7890849-55 Embedded Linux Development and Services