CONFIG_XEN_TMEM (not configurable)

modulename: tmem.ko

configname: CONFIG_XEN_TMEM

Linux Kernel Configuration
└─>Device Drivers
└─>Xen driver support
└─>XEN_TMEM
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Shim to interface in-kernel Transcendent Memory hooks
(e.g. cleancache and frontswap) to Xen tmem hypercalls.

source code:
drivers/xen/tmem.c