From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757825AbYHUXto (ORCPT ); Thu, 21 Aug 2008 19:49:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752614AbYHUXtX (ORCPT ); Thu, 21 Aug 2008 19:49:23 -0400 Received: from rex.securecomputing.com ([203.24.151.4]:33470 "EHLO cyberguard.com.au" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752116AbYHUXtV (ORCPT ); Thu, 21 Aug 2008 19:49:21 -0400 Message-ID: <48ADFE65.1050007@snapgear.com> Date: Fri, 22 Aug 2008 09:46:45 +1000 From: Greg Ungerer User-Agent: Thunderbird 2.0.0.16 (X11/20080723) MIME-Version: 1.0 To: Jamie Lokier CC: Jared Hulbert , Linux-kernel@vger.kernel.org, linux-embedded@vger.kernel.org, linux-mtd , =?ISO-8859-1?Q?J=F6rn_Engel?= , tim.bird@AM.SONY.COM, cotte@de.ibm.com, nickpiggin@yahoo.com.au Subject: Re: [PATCH 00/10] AXFS: Advanced XIP filesystem References: <48AD00C4.6060302@gmail.com> <20080821110749.GA1926@shareable.org> In-Reply-To: <20080821110749.GA1926@shareable.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jamie Lokier wrote: > Jared Hulbert wrote: >> The biggest improvement is in the way AXFS allows for each page to be XIP or >> not. First, a user collects information about which pages are accessed on a >> compressed image for each mmap()ed region from /proc/axfs/volume0. That >> 'profile' is used as an input to the image builder. The resulting image has >> only the relevant pages uncompressed and XIP. The result is smaller memory >> sizes and faster launches. > > Sounds great, really nice idea. > > How does it fare with no MMU? Can the profiler and image builder lay > out the XIP pages in such a way that no-MMU mmaps can map those regions? The key for XIP on noMMU would be the ability to store a file as one complete contiguous chunk. Can AXFS do this? Regards Greg ------------------------------------------------------------------------ Greg Ungerer -- Chief Software Dude EMAIL: gerg@snapgear.com Secure Computing Corporation PHONE: +61 7 3435 2888 825 Stanley St, FAX: +61 7 3891 3630 Woolloongabba, QLD, 4102, Australia WEB: http://www.SnapGear.com