or maybe swap-over-nbd/NFS)?
No. First, the existing swap subsystem doesn't allow for any kind of
-swap hierarchy. Perhaps it could be rewritten to accomodate a hierarchy,
+swap hierarchy. Perhaps it could be rewritten to accommodate a hierarchy,
but this would require fairly drastic changes. Even if it were
rewritten, the existing swap subsystem uses the block I/O layer which
assumes a swap device is fixed size and any page in it is linearly