linux-kernel - [PATCH v4 0/2] optimise ctx's refs grabbing in io

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Date:   Sat, 28 Dec 2019 14:13:01 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/2] optimise ctx's refs grabbing in io_uring

Optimise percpu_ref_tryget() by not calling it for each request, but
batching it. This gave a measurable ~5% performance boost for large QD.

v2: fix uncommited plug (Jens Axboe)
    better comments for percpu_ref_tryget_many (Dennis Zhou)
    amortise across io_uring_enter() boundary

v3: drop "batching across syscalls"
    remove error handling in io_submit_sqes() from common path

v4: fix error handling

Pavel Begunkov (2):
  pcpu_ref: add percpu_ref_tryget_many()
  io_uring: batch getting pcpu references

 fs/io_uring.c                   | 26 +++++++++++++++++---------
 include/linux/percpu-refcount.h | 26 +++++++++++++++++++++-----
 2 files changed, 38 insertions(+), 14 deletions(-)

-- 
2.24.0