CONFIG_ZSMALLOC (not configurable)

modulename: zsmalloc.ko

configname: CONFIG_ZSMALLOC

Linux Kernel Configuration
└─>Memory Management options
└─>ZSMALLOC
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
mm/zsmalloc.c
is selected by
CONFIG_ZSMALLOC_STAT

is depended by
CONFIG_ZRAM
CONFIG_ZSWAP