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    Subject[PATCH 0/3] compressed in-memory swapping take2

    It allows creating a RAM based block device which acts as swap disk.
    Pages swapped to this device are compressed and stored in memory itself.
    This is a big win over swapping to slow hard-disk which are typically used
    as swap disk. For flash, these suffer from wear-leveling issues when used
    as swap disk - so again its helpful. For swapless systems, it allows more
    apps to run.

    * Changelog: take2 vs initial revision:
    xvmalloc changes:
    - Use Linux kernel coding sytle for xvmalloc
    - Collapse all individual flag test/set/get to generic {test_set_get}_flag
    - Added BLOCK_NEXT() macro to reach next contiguous block
    - Other minor cleanups - no functional changes
    compcache block device code:
    - compcache core changes due to change in xvmalloc interface names

    Links to performance numbers, use cases can be found in original thread:

    Thanks to Christoph and Pekka for feedback on initial revision.


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