[PATCH v2 0/2] Optimise io_uring completion waiting

[Pavel Begunkov (Silence)]

From: Pavel Begunkov <asml.silence@xxxxxxxxx>

There could be a lot of overhead within generic wait_event_*() used for
waiting for large number of completions. The patchset removes much of
it by using custom wait event (wait_threshold).

Synthetic test showed ~40% performance boost. (see patch 2)

v2: rebase

Pavel Begunkov (2):
  sched/wait: Add wait_threshold
  io_uring: Optimise cq waiting with wait_threshold

 fs/io_uring.c                  | 35 ++++++++++++------
 include/linux/wait_threshold.h | 67 ++++++++++++++++++++++++++++++++++
 kernel/sched/Makefile          |  2 +-
 kernel/sched/wait_threshold.c  | 26 +++++++++++++
 4 files changed, 118 insertions(+), 12 deletions(-)
 create mode 100644 include/linux/wait_threshold.h
 create mode 100644 kernel/sched/wait_threshold.c

-- 
2.23.0