On 1/8/19 12:34 PM, Dan Williams wrote: > In preparation for the kernel switching device-dax instances from the > "/sys/class/dax" subsystem to "/sys/bus/dax" [1], teach the device-dax > instance detection to be subsystem-type agnostic. > > Note that the subsystem switch will require an administrator, or distro > opt-in. The opt-in will either be at kernel compile time by disabling > the default compatibility driver in the kernel, or at runtime with a > modprobe policy to override which kernel module service device-dax > devices. The daxctl utility [2] will ship a command to install the > modprobe policy and include a man page that lists the potential > regression risk to older FIO and other userspace tools that are hard > coded to "/sys/class/dax". > > [1]: https://lwn.net/Articles/770128/ > [2]: https://github.com/pmem/ndctl/tree/master/daxctl Applied, thanks Dan. -- Jens Axboe
