Device DAX: direct access mapping device

modulename: device_dax.ko

configname: CONFIG_DEV_DAX

Linux Kernel Configuration
└─>Device Drivers
└─>DAX: direct access to differentiated memory
└─>Device DAX: direct access mapping device
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Support raw access to differentiated (persistence, bandwidth,
latency...) memory via an mmap(2) capable character
device. Platform firmware or a device driver may identify a
platform memory resource that is differentiated from the
baseline memory pool. Mappings of a /dev/daxX.Y device impose
restrictions that make the mapping behavior deterministic.

source code: