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    SubjectRE: swap on eMMC and other flash

    Great topics. As per one of Rik original points:

    > 4) skip writeout of zero-filled pages - this can be a big help
    > for KVM virtual machines running Windows, since Windows zeroes
    > out free pages; simply discarding a zero-filled page is not
    > at all simple in the current VM, where we would have to iterate
    > over all the ptes to free the swap entry before being able to
    > free the swap cache page (I am not sure how that locking would
    > even work)
    > with the extra layer of indirection, the locking for this scheme
    > can be trivial - either the faulting process gets the old page,
    > or it gets a new one, either way it'll be zero filled

    Since it's KVMs realm here, can't KSM simply solve the zero-filled pages problem avoiding unnecessary burden for the Swap subsystem?


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