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Reducing memory requirements for high extent xfs files

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Subject: Reducing memory requirements for high extent xfs files
From: "Michael Nishimoto" <miken@xxxxxxxxxxxxxxxxxx>
Date: Wed, 30 May 2007 09:49:38 -0700
Sender: xfs-bounce@xxxxxxxxxxx
Hello,

Has anyone done any work or had thoughts on changes required
to reduce the total memory footprint of high extent xfs files?

Obviously, it is important to reduce fragmentation as files
are generated and to regularly defrag files, but both of these 
alternatives are not complete solutions.

To reduce memory consumption, xfs could bring in extents
from disk as needed (or just before needed) and could free 
up mappings when certain extent ranges have not been recently
accessed.  A solution should become more aggressive about 
reclaiming extent mapping memory as free memory becomes limited.

   Michael


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