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