blob: 0faf1354cd054fd39d69120e5b8eb5b89723af7b [file] [log] [blame]
What: /sys/class/dax/
Date: May, 2016
KernelVersion: v4.7
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