/dev/dax size
by Elliott, Robert (Persistent Memory)
How is an application supposed to detect the max mmap() size possible
for a /dev/daxNN device?
fio, for example, doesn't know what size to use. Its os/os-linux.h
does not define FIO_HAVE_CHARDEV_SIZE and it has no chardev_size
function to determine the size of a character device.
---
Robert Elliott, HPE Persistent Memory