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    Subject[PATCH RFC 0/4] xen-block: prevent blkfront for hoarding grants
    Date
    The following patches prevent blkfront from hoarding all grants in the 
    system by allowing blkfront to request blkback to unmap certain grants
    so they can be freed by blkfront. This is done periodically by
    blkfront, unmapping a certain amount of unused persistent grants.

    This series also includes a bug fix for the grant table free callback
    implementation.

    According to my tests, this series don't introduce any performance
    regressions, results can be seen at:

    http://xenbits.xen.org/people/royger/persistent_unmap/


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