1What:           /sys/class/dax/
2Date:           May, 2016
3KernelVersion:  v4.7
4Contact:        nvdimm@lists.linux.dev
5Description:	Device DAX is the device-centric analogue of Filesystem
6		DAX (CONFIG_FS_DAX).  It allows memory ranges to be
7		allocated and mapped without need of an intervening file
8		system.  Device DAX is strict, precise and predictable.
9		Specifically this interface:
10
11		1. Guarantees fault granularity with respect to a given
12		   page size (pte, pmd, or pud) set at configuration time.
13
14		2. Enforces deterministic behavior by being strict about
15		   what fault scenarios are supported.
16
17		The /sys/class/dax/ interface enumerates all the
18		device-dax instances in the system. The ABI is
19		deprecated and will be removed after 2020. It is
20		replaced with the DAX bus interface /sys/bus/dax/ where
21		device-dax instances can be found under
22		/sys/bus/dax/devices/
23