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* [RFC PATCH 0/2] Optimise io_uring completion waiting
@ 2019-09-13 22:28 Pavel Begunkov (Silence)
  2019-09-13 22:28 ` [RFC PATCH 1/2] sched/wait: Add wait_threshold Pavel Begunkov (Silence)
                   ` (2 more replies)
  0 siblings, 3 replies; 5+ messages in thread
From: Pavel Begunkov (Silence) @ 2019-09-13 22:28 UTC (permalink / raw)
  To: Jens Axboe, Ingo Molnar, Peter Zijlstra, linux-block, linux-kernel
  Cc: Pavel Begunkov

From: Pavel Begunkov <asml.silence@gmail.com>

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)

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

 fs/io_uring.c                  | 21 ++++++-----
 include/linux/wait_threshold.h | 64 ++++++++++++++++++++++++++++++++++
 kernel/sched/Makefile          |  2 +-
 kernel/sched/wait_threshold.c  | 26 ++++++++++++++
 4 files changed, 103 insertions(+), 10 deletions(-)
 create mode 100644 include/linux/wait_threshold.h
 create mode 100644 kernel/sched/wait_threshold.c

-- 
2.22.0


^ permalink raw reply	[flat|nested] 5+ messages in thread

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Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2019-09-13 22:28 [RFC PATCH 0/2] Optimise io_uring completion waiting Pavel Begunkov (Silence)
2019-09-13 22:28 ` [RFC PATCH 1/2] sched/wait: Add wait_threshold Pavel Begunkov (Silence)
2019-09-13 22:28 ` [RFC PATCH 2/2] io_uring: Optimise cq waiting with wait_threshold Pavel Begunkov (Silence)
2019-09-14  0:31 ` [RFC PATCH 0/2] Optimise io_uring completion waiting Jens Axboe
2019-09-14 10:11   ` Pavel Begunkov

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