Right, we probably should do that. But consider that any time this happens a
reverse map would have eliminated the fault because we wouldn't need to unmap
the page until we're actually going to free it.
> #2 If a page is referenced multiple times by different processes is the
> behaviour of multiple upward aging actually wrong.
With rmap it's easy to do it either way: either treat the ref bits as if
they're all or'd together or, perhaps more sensibly, age up by an amount that
depends on the number of ref bits set, but not as much as UP_AGE * refs.
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