linux-ext4 - ext3 and prefetching

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Message-ID: <465BE76F.6040106@lichota.net>
Date:	Tue, 29 May 2007 10:42:23 +0200
From:	Krzysztof Lichota <krzysiek@...hota.net>
To:	linux-ext4@...r.kernel.org
Subject: ext3 and prefetching

Hello everyone.
Let me introduce myself to the list :)
My name is Krzysztof Lichota, I am at the first year of PhD studies at
the Warsaw University.
This summer I will be working on "Automatic boot and application start
file prefetching" project as part of Google Summer of Code.
Part of this project is implementing offline defragmenter tool for ext3
which will lay out files on disk in a way to minimize disk seeks during
application and system start.

Two prototypes were considered for this purpose and we chose to use
ext3remapper tool created by Jan Kara. I will be starting the
implementation based on this code soon.

The design summary is put on
http://code.google.com/p/prefetch/wiki/Ext3LayoutToolDesign page and
discussed on our mailing list (mainly this thread:
http://groups.google.com/group/prefetch-devel/browse_thread/thread/2d800df1ceaab5ae/e0bbb68fe61b3725#e0bbb68fe61b3725).
Currently the tool is able to relocate file data and indirect blocks,
relocating inodes is planned.
The code is available from project SVN repository:
http://prefetch.googlecode.com/svn/trunk/ext3remapper/

If you are interested in prefetching issues or have comments about ext3
tool implementation or design, you are welcome to join our project -
main project page is http://code.google.com/p/prefetch/, there is a
mailing list (http://groups.google.com/group/prefetch-devel), you can
subscribe by sending e-mail to prefetch-devel-subscribe@...glegroups.com
or you can browse archives online.

I would be grateful for reviewing the tool code for potential problems
when working on ext3 structures, your expertise will be really
appreciated :)

	Krzysztof Lichota

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