Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263573AbTEIXMX (ORCPT ); Fri, 9 May 2003 19:12:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263574AbTEIXMW (ORCPT ); Fri, 9 May 2003 19:12:22 -0400 Received: from cpe-24-221-190-179.ca.sprintbbd.net ([24.221.190.179]:28309 "EHLO myware.akkadia.org") by vger.kernel.org with ESMTP id S263573AbTEIXMW (ORCPT ); Fri, 9 May 2003 19:12:22 -0400 Message-ID: <3EBC38C1.6020305@redhat.com> Date: Fri, 09 May 2003 16:24:49 -0700 From: Ulrich Drepper Organization: Red Hat, Inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4b) Gecko/20030506 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Timothy Miller CC: linux-kernel@vger.kernel.org Subject: Re: hammer: MAP_32BIT References: <3EBB5A44.7070704@redhat.com> <20030509092026.GA11012@averell> <16059.37067.925423.998433@gargle.gargle.HOWL> <20030509113845.GA4586@averell> <3EBC0084.4090809@redhat.com> <3EBC15B5.4070604@zytor.com> <3EBC2164.6050605@redhat.com> <3EBC29A5.1050005@techsource.com> <3EBC2A3C.8040409@redhat.com> <3EBC3167.2030302@techsource.com> In-Reply-To: <3EBC3167.2030302@techsource.com> X-Enigmail-Version: 0.75.0.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1208 Lines: 32 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Timothy Miller wrote: > Why does there ever need to be an explicit HINT that you would prefer a > <32 bit address, when it's known a priori that <32 is better? Why > doesn't the mapping code ALWAYS try to use 32-bit addresses before > resorting to 64-bit? Because not all memory is addressed via GDT entries. In fact, almost none is, only thread stacks and similar gimicks. If all mmap memory would by default be served from the low memory pool you soon run out of it and without any good reason. - -- - --------------. ,-. 444 Castro Street Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA Red Hat `--' drepper at redhat.com `--------------------------- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQE+vDjB2ijCOnn/RHQRAnHmAJ9V3BwxGTAUs7hw1YXowv0K0cEFFACePj6t vLI+B5BlYG4ox5WcyFrwg8A= =IGO2 -----END PGP SIGNATURE----- - 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/