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    Subject[PATCH v1 0/6] Remove rw_page
    Date
    Recently, there was a dicussion about removing rw_page due to maintainance
    burden[1] but the problem was zram because zram has a clear win for the
    benchmark at that time. The reason why only zram have a win is due to
    bio allocation wait time from mempool under extreme memory pressure.

    Christoph Hellwig suggested we can use on-stack-bio for rw_page devices.
    This patch implements it and replace rw_page operations with on-stack-bio
    and then finally, remove rw_page interface completely.

    This patch is based on linux-next-20170804

    [1] http://lkml.kernel.org/r/<20170728165604.10455-1-ross.zwisler@linux.intel.com>

    Minchan Kim (6):
    bdi: introduce BDI_CAP_SYNC
    fs: use on-stack-bio if backing device has BDI_CAP_SYNC capability
    mm:swap: remove end_swap_bio_write argument
    mm:swap: use on-stack-bio for BDI_CAP_SYNC devices
    zram: remove zram_rw_page
    fs: remove rw_page

    drivers/block/brd.c | 2 +
    drivers/block/zram/zram_drv.c | 54 +---------------
    drivers/nvdimm/btt.c | 2 +
    drivers/nvdimm/pmem.c | 2 +
    fs/block_dev.c | 76 ----------------------
    fs/mpage.c | 45 +++++++++++--
    include/linux/backing-dev.h | 7 ++
    include/linux/blkdev.h | 4 --
    include/linux/swap.h | 6 +-
    mm/page_io.c | 145 +++++++++++++++++++++++++-----------------
    mm/swapfile.c | 3 +
    mm/zswap.c | 2 +-
    12 files changed, 147 insertions(+), 201 deletions(-)

    --
    2.7.4

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