[PATCH for-next 0/2] Enable IOU_F_TWQ_LAZY_WAKE for passthrough

Pavel Begunkov
2023-05-15T12:58:07Z

Let cmds to use IOU_F_TWQ_LAZY_WAKE and enable it for nvme passthrough.

The result should be same as in test to the original IOU_F_TWQ_LAZY_WAKE [1]
patchset, but for a quick test I took fio/t/io_uring with 4 threads each
reading their own drive and all pinned to the same CPU to make it CPU
bound and got +10% throughput improvement.

[1] https://lore.kernel.org/all/cover.1680782016.git.asml.silence@gmail.com/

Pavel Begunkov (2):
io_uring/cmd: add cmd lazy tw wake helper
nvme: optimise io_uring passthrough completion

drivers/nvme/host/ioctl.c | 4 ++--
include/linux/io_uring.h | 18 ++++++++++++++++--
io_uring/uring_cmd.c | 16 ++++++++++++----
3 files changed, 30 insertions(+), 8 deletions(-)

base-commit: 9a48d604672220545d209e9996c2a1edbb5637f6
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2.40.0