On Mon, 21 Nov 2005, Rob Landley wrote:
> 2^64 we may actually live to see the end of someday, but it's not guaranteed.
> 2^128 becoming relevant in our lifetimes is a touch unlikely.
Some people suggested we don't know usage and organization patterns yet,
perhaps something that is very sparse can benefit from linear addressing
in a huge (not to say vastly oversized) address space. Perhaps not.
One real-world example is that we've been doing RAM overcommit for a
long time to account for but not actually perform memory allocations,
and on 32-bit machines, 1 GB of RAM already required highmem until
recently. So here, 64-bit address space comes as an advantage.
--
Matthias Andree
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