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    Subject[PATCH 0/3] ramzswap: Eliminate stale data from compressed memory (v2)
    Date
    (tested on mainline but should apply to linux-next cleanly)

    * Changelog: v2 vs initial patches
    - directly add swap free callback to block_device_operations
    instead of using 'notifiers' for various swap events.

    ramzswap driver creates RAM based block devices which can be
    used (only) as swap disks. Pages swapped to these disks are
    compressed and stored in memory itself.

    However, these devices do not get any notification when a swap
    slot is freed (swap_map[i] reaches 0). So, we cannot free memory
    allocated corresponding to this swap slot. Such stale data can
    quickly accumulate in (compressed) memory defeating the whole
    purpose of such devices.

    To overcome this problem, we now add a callback in struct
    block_device_operations which is called as soon as a swap
    slot is freed.

    Nitin Gupta (3):
    Add flag to identify block swap devices
    Add swap slot free callback to block_device_operations
    ramzswap: Handler for swap slot free callback

    drivers/staging/ramzswap/TODO | 5 -----
    drivers/staging/ramzswap/ramzswap_drv.c | 22 +++++++++++++---------
    include/linux/blkdev.h | 2 ++
    include/linux/swap.h | 1 +
    mm/swapfile.c | 5 +++++
    5 files changed, 21 insertions(+), 14 deletions(-)
    delete mode 100644 drivers/staging/ramzswap/TODO



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