quoted

Then would it be useful to "swap" a page from the DMA zone into the normal zone
(and of course after that ending up swapping from the normal zone to the disk)?

Yes.  There are _lots_ of other possible applications for that sort of
non-IO-consuming relocation-style swapping, including memory
defragmentation (we really need that if we want to support things like
large page stuff on Intel boxes for user space).

doesn't good page coloring need this ability, as well, 
to move around which physical page is backing a virtual one?
guess it depends on whether the arch does cache lookups based
on p or v addresses...

thanks, mark hahn.

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