> Note: rmap chains can be restricted to an arbitrary length, or an
> arbitrary total count trivially. All you have to do is allow a fixed
> limit on the number of people who can map a page simultaneously.
>
> The selection of which chain to unmap can be a bit tricky but is
> relatively straight forward. Why doesn't someone who is seeing
> this just hack this up?
I'm not sure how useful this feature would be. Also,
there are a bunch of corner cases in which you cannot
limit the number of processes mapping a page, think
about eg. mlock, nonlinear vmas and anonymous memory.
All in all I suspect that the cost of such a feature
might be higher than any benefits.
cheers,
Rik
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