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    SubjectRE: Frontswap [PATCH 0/4] (was Transcendent Memory): overview
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    On Fri, 2010-04-30 at 08:59 -0700, Dan Magenheimer wrote:
    > Dave or others can correct me if I am wrong, but I think CMM2 also
    > handles dirty pages that must be retained by the hypervisor. The
    > difference between CMM2 (for dirty pages) and frontswap is that
    > CMM2 sets hints that can be handled asynchronously while frontswap
    > provides explicit hooks that synchronously succeed/fail.

    Once pages were dirtied (or I guess just slightly before), they became
    volatile, and I don't think the hypervisor could do anything with them.
    It could still swap them out like usual, but none of the CMM-specific
    optimizations could be performed.

    CC'ing Martin since he's the expert. :)

    -- Dave



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