Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750857AbWBCWlA (ORCPT ); Fri, 3 Feb 2006 17:41:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750855AbWBCWlA (ORCPT ); Fri, 3 Feb 2006 17:41:00 -0500 Received: from rtr.ca ([64.26.128.89]:24557 "EHLO mail.rtr.ca") by vger.kernel.org with ESMTP id S1750816AbWBCWk7 (ORCPT ); Fri, 3 Feb 2006 17:40:59 -0500 Message-ID: <43E3DB99.9020604@rtr.ca> Date: Fri, 03 Feb 2006 17:39:21 -0500 From: Mark Lord User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.1) Gecko/20060130 SeaMonkey/1.0 MIME-Version: 1.0 To: Jan Engelhardt Cc: Ulrich Mueller , Herbert Poetzl , linux-kernel@vger.kernel.org, Jens Axboe , Linus Torvalds , Byron Stanoszek , Ingo Molnar , Andrew Morton Subject: Re: [PATCH ] VMSPLIT config options (with default config fixed) References: <20060110132957.GA28666@elte.hu> <20060110133728.GB3389@suse.de> <20060110143931.GM3389@suse.de> <43C3E9C2.1000309@rtr.ca> <20060110173217.GU3389@suse.de> <43C3F0CA.10205@rtr.ca> <43C403BA.1050106@pobox.com> <43C40803.2000106@rtr.ca> <20060201222314.GA26081@MAIL.13thfloor.at> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1239 Lines: 34 Jan Engelhardt wrote: > > This sort of testing reminds me of Linus's 100->1000 Hz change > ("I chose 1000 originally partly as a way to make sure that people that > assumed HZ was 100 would get a swift kick in the pants.") > > Could we also do that with VMSPLIT? > ("Let's choose VMSPLIT_2G to make sure that i386-people that assumed > PAGE_OFFSET was 0xC0000000 would get...") Mmm.. bad idea. As much as I'd like the default to be 3GB_OPT, that would be a big impact to userspace, and there's no point in breaking everyone's machines when advanced users can just reconfig/recompile to get what they want. >> Hm, I wonder if we could have a more fine-grained choice of the >> boundary? There are also systems around with e.g. 1.25G or 1.5G of >> main memory. >> > Maybe something like: > config VMSPLIT_1G > bool "1G/3G user/kernel split" > config VMSPLIT_X > bool "Manual split" > endchoice ... Yes, that looks like a good idea. Cheers - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/