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    Subject[PATCH 00/10] zram: various improvements and cleanups
    Date
    The zram module creates RAM based block devices named /dev/zram<id>
    (<id> = 0, 1, ...). Pages written to these disks are compressed and stored
    in memory itself.

    One of the major changes done is the replacement of ioctls with sysfs
    interface. One of the advantages of this approach is we no longer depend on the
    userspace tool (rzscontrol) which was used to set various parameters and check
    statistics. Maintaining updated version of rzscontrol as changes were done to
    ioctls, statistics exported etc. was a major pain.

    Another significant change is the introduction of percpu stats and compression
    buffers. Earlier, we had per-device buffers protected by a mutex. This was a
    major bottleneck on multi-core systems. With these changes, benchmarks with
    fio[1] showed a speedup of about 20% for write performance on dual-core
    system (see patch 4/10 description for details).


    For easier testing, a single patch against 2.6.35-git8 has been uploaded at:
    http://compcache.googlecode.com/hg/sub-projects/mainline/zram_2.6.36-rc0.patch

    [1] fio I/O benchmarking tool: http://freshmeat.net/projects/fio/

    Nitin Gupta (10):
    Replace ioctls with sysfs interface
    Remove need for explicit device initialization
    Use percpu stats
    Use percpu buffers
    Reduce per table entry overhead by 4 bytes
    Block discard support
    Increase compressed page size threshold
    Some cleanups
    Update zram documentation
    Document sysfs entries

    Documentation/ABI/testing/sysfs-block-zram | 99 ++++
    drivers/staging/zram/Kconfig | 12 -
    drivers/staging/zram/Makefile | 2 +-
    drivers/staging/zram/xvmalloc.c | 22 +-
    drivers/staging/zram/zram.txt | 58 ++-
    drivers/staging/zram/zram_drv.c | 670 ++++++++++++++--------------
    drivers/staging/zram/zram_drv.h | 138 ++----
    drivers/staging/zram/zram_ioctl.h | 41 --
    drivers/staging/zram/zram_sysfs.c | 253 +++++++++++
    9 files changed, 760 insertions(+), 535 deletions(-)
    create mode 100644 Documentation/ABI/testing/sysfs-block-zram
    delete mode 100644 drivers/staging/zram/zram_ioctl.h
    create mode 100644 drivers/staging/zram/zram_sysfs.c

    --
    1.7.2.1



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