Making it a CONFIG option would preclude leveraging the advantages of the
radix tree that fall out from its ordered nature, so I'd vote for all or
nothing in this case.
I also have some perhaps-twisted plans for this thing, but if this patch
passes muster on its own merits - that is, in the context we're currently
using the pcache hash as opposed to new capabilities that can be leveraged -
that's the ideal situation. Hence no, or minimal, talking up other
advantages.
I'm inclined to think that the radix tree has locality advantages for UP as
well as SMP, under certain types of filesystem loads, and that it is never
worse. Well, we shall see about that soon enogh.
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