[RFC 0/4] completion locking optimisation feature

[Pavel Begunkov <asml.silence@gmail.com>]

A WIP feature optimising out CQEs posting spinlocking for some use cases.
For a more detailed description see 4/4.

Quick benchmarking with fio/t/io_uring nops gives extra 4% to throughput for
QD=1, and ~+2.5% for QD=4.

Pavel Begunkov (4):
  io_uring: get rid of raw fill cqe in kill_timeout
  io_uring: get rid of raw fill_cqe in io_fail_links
  io_uring: remove raw fill_cqe from linked timeout
  io_uring: optimise compl locking for non-shared rings

 fs/io_uring.c                 | 126 ++++++++++++++++++++++------------
 include/uapi/linux/io_uring.h |   1 +
 2 files changed, 85 insertions(+), 42 deletions(-)

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2.35.1