Right ... and anonymous chains are about 95% single-reference (at least for
the case I looked at), so they're direct mapped from the struct page with
no chain at all. Cuts out something like 95% of the space overhead of
pte-chains, and 65% of the time (for kernel compile -j256 on 16x system).
However, it's going to be a little more expensive to *use* the mappings,
so we need to measure that carefully.
M.
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