> currently, the MD part deals with some allocation policies,
> eg. preferablly allocate buffers from DMAable memory.
> how do you think about it?
> i guess "file" page caches can use the same or similar mechanism.

The remnants of such things that I have seen sofar (e.g. on alpha)
don't make much sense to me. The "special" memory passed to allocsys()
on some platforms is only used to allocate the `buf' array itself, which
need not be `DMAable'.

-pk