[GIT PULL] IO poll support

[GIT PULL] IO poll support

[Jens Axboe]

Hi Linus,

Various groups have been doing experimentation around IO polling for
(really) fast devices. The code has been reviewed and has been sitting
on the side for a few releases, but this is now good enough for
coordinated benchmarking and further experimentation.

Currently O_DIRECT sync read/write are supported. A framework is in the
works that allows scalable stats tracking so we can auto-tune this. And
we'll add libaio support as well soon. Fow now, it's an opt-in feature
for test purposes.

Please pull!


  git://git.kernel.dk/linux-block.git for-4.4/io-poll


----------------------------------------------------------------
Jens Axboe (5):
      block: change ->make_request_fn() and users to return a queue cookie
      blk-mq: return tag/queue combo in the make_request_fn handlers
      block: add block polling support
      NVMe: add blk polling support
      directio: add block polling support

 arch/m68k/emu/nfblock.c                     |  3 +-
 arch/powerpc/sysdev/axonram.c               |  5 ++-
 arch/xtensa/platforms/iss/simdisk.c         |  3 +-
 block/blk-core.c                            | 67 ++++++++++++++++++++++++-----
 block/blk-mq-sysfs.c                        | 10 +++++
 block/blk-mq.c                              | 59 +++++++++++++++----------
 block/blk-sysfs.c                           | 35 +++++++++++++++
 drivers/block/brd.c                         |  5 ++-
 drivers/block/drbd/drbd_int.h               |  2 +-
 drivers/block/drbd/drbd_req.c               |  3 +-
 drivers/block/null_blk.c                    |  3 +-
 drivers/block/pktcdvd.c                     |  9 ++--
 drivers/block/ps3vram.c                     |  6 ++-
 drivers/block/rsxx/dev.c                    |  5 ++-
 drivers/block/umem.c                        |  4 +-
 drivers/block/zram/zram_drv.c               |  5 ++-
 drivers/lightnvm/rrpc.c                     |  9 ++--
 drivers/md/bcache/request.c                 | 11 +++--
 drivers/md/dm.c                             |  6 +--
 drivers/md/md.c                             |  8 ++--
 drivers/nvdimm/blk.c                        |  3 +-
 drivers/nvdimm/btt.c                        |  3 +-
 drivers/nvdimm/pmem.c                       |  3 +-
 drivers/nvme/host/pci.c                     | 32 ++++++++++++--
 drivers/s390/block/dcssblk.c                |  8 ++--
 drivers/s390/block/xpram.c                  |  5 ++-
 drivers/staging/lustre/lustre/llite/lloop.c |  5 ++-
 fs/direct-io.c                              | 14 ++++--
 include/linux/blk-mq.h                      | 10 +++++
 include/linux/blk_types.h                   | 24 +++++++++++
 include/linux/blkdev.h                      |  7 ++-
 include/linux/fs.h                          |  2 +-
 include/linux/lightnvm.h                    |  2 +-
 33 files changed, 286 insertions(+), 90 deletions(-)

-- 
Jens Axboe