First, here is a link to article on compcache.
http://code.google.com/p/compcache/wiki/CompilingAndUsingNew
zswap is already in the kernel and you can see the documentation in the kernel documentation. Here is the name of the file if you need:
/usr/share/doc/kernel-doc-$(uname -r)/Documentation/vm/zswap.txt
Here is the overview, in case you do not want to install kernel-doc
Overview:
Zswap is a lightweight compressed cache for swap pages. It takes pages that are
in the process of being swapped out and attempts to compress them into a
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