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    SubjectRe: [PATCH 2.5.43-mm2] New shared page table patch
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    "Martin J. Bligh" <mbligh@aracnet.com> writes:

    > >> For reference, one of the tests was TPC-H. My code reduced the number of
    > >> allocated pte_chains from 5 million to 50 thousand.
    > >
    > > Don't tease, what did that do for performance? I see that someone has
    > > already posted a possible problem, and the code would pass for complex for
    > > most people, so is the gain worth the pain?
    >
    > In many cases, this will stop the box from falling over flat on it's
    > face due to ZONE_NORMAL exhaustion (from pte-chains), or even total
    > RAM exhaustion (from PTEs). Thus the performance gain is infinite ;-)

    So why has no one written a pte_chain reaper? It is perfectly sane
    to allocate a swap entry and move an entire pte_chain to the swap
    cache.

    Eric
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