From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 8 May 2002 11:13:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 8 May 2002 11:13:07 -0400 Received: from mail3.aracnet.com ([216.99.193.38]:52717 "EHLO mail3.aracnet.com") by vger.kernel.org with ESMTP id ; Wed, 8 May 2002 11:13:06 -0400 Date: Wed, 08 May 2002 08:12:12 -0700 From: "Martin J. Bligh" Reply-To: "Martin J. Bligh" To: Rik van Riel , Gerrit Huizenga cc: Clifford White , linux-kernel@vger.kernel.org, oliendm@us.ibm.com Subject: Re: x86 question: Can a process have > 3GB memory? Message-ID: <191939915.1020845530@[10.10.2.3]> In-Reply-To: X-Mailer: Mulberry/2.1.2 (Win32) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >> Hey Cliff, we are planning to implement virtwin() if you remember that >> from PTX. AWE on NT was derived from the same work. There should soon >> be some discussion about it on lse-tech@lists.sourceforge.net or I can >> give you some more data... > > Please implement it in userspace, using large POSIX shared memory > segments and mmaping / munmapping them as needed. > > This seems like a special enough case to keep it out of the kernel > entirely. If there's something not efficient enough we could work > on optimising the whole mmap & munmap path... How are you going to change the user page tables from userspace? This mechanism would seem to need kernel support however you did it. M.