18c2ecf20Sopenharmony_ciWhat:           /sys/class/dax/
28c2ecf20Sopenharmony_ciDate:           May, 2016
38c2ecf20Sopenharmony_ciKernelVersion:  v4.7
48c2ecf20Sopenharmony_ciContact:        linux-nvdimm@lists.01.org
58c2ecf20Sopenharmony_ciDescription:	Device DAX is the device-centric analogue of Filesystem
68c2ecf20Sopenharmony_ci		DAX (CONFIG_FS_DAX).  It allows memory ranges to be
78c2ecf20Sopenharmony_ci		allocated and mapped without need of an intervening file
88c2ecf20Sopenharmony_ci		system.  Device DAX is strict, precise and predictable.
98c2ecf20Sopenharmony_ci		Specifically this interface:
108c2ecf20Sopenharmony_ci
118c2ecf20Sopenharmony_ci		1. Guarantees fault granularity with respect to a given
128c2ecf20Sopenharmony_ci		   page size (pte, pmd, or pud) set at configuration time.
138c2ecf20Sopenharmony_ci
148c2ecf20Sopenharmony_ci		2. Enforces deterministic behavior by being strict about
158c2ecf20Sopenharmony_ci		   what fault scenarios are supported.
168c2ecf20Sopenharmony_ci
178c2ecf20Sopenharmony_ci		The /sys/class/dax/ interface enumerates all the
188c2ecf20Sopenharmony_ci		device-dax instances in the system. The ABI is
198c2ecf20Sopenharmony_ci		deprecated and will be removed after 2020. It is
208c2ecf20Sopenharmony_ci		replaced with the DAX bus interface /sys/bus/dax/ where
218c2ecf20Sopenharmony_ci		device-dax instances can be found under
228c2ecf20Sopenharmony_ci		/sys/bus/dax/devices/
23