From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wes Felter <wesley@felter.org>
Subject: Re: dmcache project
Date: Mon, 12 Oct 2009 14:47:50 -0500
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ganesh kumar wrote:
> hello,
>       I am working on the dmcacheio project which is described in the
> http://kernelnewbies.org/KernelProjects/DmCache.I am newbie to he
> kernel modules..kindly give me the ideas to implement the project
> through device mapper.hoping replies

Someone already started on this: 
http://users.cis.fiu.edu/~zhaom/dmcache/index.html

There are plenty of possible improvements:
Parameter tuning (e.g. block size)
Replacing the set associative crap with a fully associative hash table
Sequential IO bypass
Flash-optimized writeback (e.g. log-structured)

Wes Felter