config ZCACHE tristate "Dynamic compression of swap pages and clean pagecache pages" depends on CLEANCACHE || FRONTSWAP select XVMALLOC select LZO_COMPRESS select LZO_DECOMPRESS default n help Zcache doubles RAM efficiency while providing a significant performance boosts on many workloads. Zcache uses lzo1x compression and an in-kernel implementation of transcendent memory to store clean page cache pages and swap in RAM, providing a noticeable reduction in disk I/O.