1*4882a593SmuzhiyunWhat: /sys/class/dax/ 2*4882a593SmuzhiyunDate: May, 2016 3*4882a593SmuzhiyunKernelVersion: v4.7 4*4882a593SmuzhiyunContact: linux-nvdimm@lists.01.org 5*4882a593SmuzhiyunDescription: Device DAX is the device-centric analogue of Filesystem 6*4882a593Smuzhiyun DAX (CONFIG_FS_DAX). It allows memory ranges to be 7*4882a593Smuzhiyun allocated and mapped without need of an intervening file 8*4882a593Smuzhiyun system. Device DAX is strict, precise and predictable. 9*4882a593Smuzhiyun Specifically this interface: 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun 1. Guarantees fault granularity with respect to a given 12*4882a593Smuzhiyun page size (pte, pmd, or pud) set at configuration time. 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun 2. Enforces deterministic behavior by being strict about 15*4882a593Smuzhiyun what fault scenarios are supported. 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun The /sys/class/dax/ interface enumerates all the 18*4882a593Smuzhiyun device-dax instances in the system. The ABI is 19*4882a593Smuzhiyun deprecated and will be removed after 2020. It is 20*4882a593Smuzhiyun replaced with the DAX bus interface /sys/bus/dax/ where 21*4882a593Smuzhiyun device-dax instances can be found under 22*4882a593Smuzhiyun /sys/bus/dax/devices/ 23