Re: Why *not* rmap, anyway?

["Martin J. Bligh" <Martin.Bligh@us.ibm.com>]

>> Because it costs something to maintain the reverse map.
>> If the cost exceeds the benefit, it's not worth it. That's
> 
> Sure, but it's not obvious (is it?) that the rmap cost
> exceeds the cost of scanning every process's virtual
> address space looking for pages to unmap.

No, but neither is it obvious that the cost of the virtual
scanning exceeds the cost of rmap ;-)

I think rmap will win in the end, but there's really only 
one way to prove it ;-)

M.
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