The zswap compressed swap cache

As Seth responded, zcache is part of a larger portfolio of inter-related code and objectives, called Transcendent Memory (or "tmem"), supporting different kinds of "input" data (frontends) and different "data stores" (backends). Tmem and its friends are described here: http://lwn.net/Articles/454795/
Avi Miller gave a talk on it at linux.conf.au last month and the recording of that talk can be found here: http://mirror.linux.org.au/linux.conf.au/2013/ogv/Transce...