In message <874sltybb0.fsf@redmail.redback.com>,
Chris G. Demetriou writes:

>
>the real difference is now there's a way to implement the buffer cache
>that doesn't involve the gross hack that's there now.  8-)

Ok, makes sense. I think Jason was probably right about me confusing
mips TLB bits with pmap bits: `can take fault' rather than `pageable'.