From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from rex.securecomputing.com ([203.24.151.4] helo=cyberguard.com.au) by bombadil.infradead.org with esmtps (Exim 4.68 #1 (Red Hat Linux)) id 1KWJuA-0007gn-3w for linux-mtd@lists.infradead.org; Thu, 21 Aug 2008 23:49:26 +0000 Message-ID: <48ADFE65.1050007@snapgear.com> Date: Fri, 22 Aug 2008 09:46:45 +1000 From: Greg Ungerer MIME-Version: 1.0 To: Jamie Lokier 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 Cc: cotte@de.ibm.com, linux-embedded@vger.kernel.org, nickpiggin@yahoo.com.au, =?ISO-8859-1?Q?J=F6rn_Engel?= , Linux-kernel@vger.kernel.org, linux-mtd , tim.bird@AM.SONY.COM List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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