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
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