[[NitinGupta|Nitin Gupta]]

<<MailTo(nitingupta910 AT gmail DOT com)>>

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 . This page contains some prototype code developed for CompressedCaching project. After seriously insufficient testing, each of these components were eventually merged into final implementation on 2.6.x kernels.
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|| [[http://linuxcompressed.sourceforge.net/|Project Home Page]] || CompressedCaching || [[http://sourceforge.net/project/showfiles.php?group_id=13472|Patches]] ||
=== Compression algorithms to kernel mode: ===
Kernel module to test de/compression algorithms (WKdm, WK4x4, LZO): [[attachment:compress-test.tar.gz]]

There are basically three main algorithms that are well studied w.r.t compressed caching by previous works -- WKdm, WK4x4, LZO.

Of these, WKdm, WK4x4 are designed to handle anon pages (non filesystem pages) while LZO is more suitable for filesystem data. (Also, in general, compression speed is in order: WKdm > WK4x4 > LZO, while compression factor order is, in general, reverse).

Now, all three algos are ported to kernel space - WKdm, WK4x4 and LZO. You can test them all using this module. It creates 3 /proc entries: /proc/compress-test/{compress, decompress, algo_idx} as described below: (for some detail see README with this module)

''' In short:'''

__''Write to /proc/compress-test entries:''__

1. ''compress'': compress data witten to it and store in internal buffer.

2. ''algo_idx'': write index of algo you want to test (0: WKdm, 1: WK4x4, 2: LZO)

__''Read from /proc/compress-test entries:''__

1. ''compress'': show original and compressed size (TODO: add other stats like time taken too)

2. ''decompress'': decompress compressed data stored in internal buffer.

3. ''algo_idx'': shows list of algos supported with their index.

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