linux-kernel - Re: [PATCH 00/10] AXFS: Advanced XIP filesystem

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Message-ID: <20080821110749.GA1926@shareable.org>
Date:	Thu, 21 Aug 2008 12:07:50 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Jared Hulbert <jaredeh@...il.com>
Cc:	Linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	Jörn Engel <joern@...fs.org>,
	tim.bird@...SONY.COM, cotte@...ibm.com, nickpiggin@...oo.com.au
Subject: Re: [PATCH 00/10] AXFS: Advanced XIP filesystem

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?

No complaint if not, it would be a nice bonus though.

-- Jamie
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