IMHO, a ramdisk block device is the wrong approach to getting a
memory based filesystem
- It allways uses a fixed ammount of memory, irregardless of
how full it is.
- It uses a "normal" filesystem on it, with the overhead associated
with that.
- You need to mkfs any ramdisk you want to use. PITA.
instead, we want a generic memory based filesystem; which would
eventually be pageable. We should do something along the lines of
Sun's tmpfs...