Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964805AbVLQUZJ (ORCPT ); Sat, 17 Dec 2005 15:25:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964794AbVLQUZJ (ORCPT ); Sat, 17 Dec 2005 15:25:09 -0500 Received: from tag.witbe.net ([81.88.96.48]:20107 "EHLO tag.witbe.net") by vger.kernel.org with ESMTP id S964805AbVLQUZI (ORCPT ); Sat, 17 Dec 2005 15:25:08 -0500 Message-Id: <200512172023.jBHKNiD15808@tag.witbe.net> Reply-To: From: "Paul Rolland" To: "'Kyle Moffett'" , "'Andi Kleen'" Cc: "'Adrian Bunk'" , , , Subject: Re: [2.6 patch] i386: always use 4k stacks Date: Sat, 17 Dec 2005 21:23:42 +0100 Organization: Witbe.net MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.6353 In-Reply-To: <714652CE-EA33-4DD0-B9BB-C1D0E597F7F2@mac.com> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 Thread-Index: AcYDRtrLKasHH/kORKaIUc9WyIxAGAAAK2hA x-ncc-regid: fr.witbe Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1426 Lines: 37 Hello, > One comment on x86-64 vs. x86: There are restrictions on where in > memory your process stacks can be located on a 32-bit > platform. They > need to reside in lowmem, which means under certain circumstances > your lowmem can get too fragmented to create new processes even > though you still have a lot of available RAM. But where does these restrictions come from ? As far as I know, stack is referenced to by SS:ESP registers, and nothing in the x86 architecture prevents them from pointing outside of lowmem... Isn't this simply a Linux design restriction ? Regards, Paul Paul Rolland, rol(at)as2917.net ex-AS2917 Network administrator and Peering Coordinator -- Please no HTML, I'm not a browser - Pas d'HTML, je ne suis pas un navigateur "Some people dream of success... while others wake up and work hard at it" "I worry about my child and the Internet all the time, even though she's too young to have logged on yet. Here's what I worry about. I worry that 10 or 15 years from now, she will come to me and say 'Daddy, where were you when they took freedom of the press away from the Internet?'" --Mike Godwin, Electronic Frontier Foundation - 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/