linux-kernel - [PATCH v2 0/3] optimise ctx's refs grabbing in io

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Message-Id: <cover.1576944502.git.asml.silence@gmail.com>
Date:   Sat, 21 Dec 2019 19:15:06 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Tejun Heo <tj@...nel.org>, Dennis Zhou <dennis@...nel.org>,
        Christoph Lameter <cl@...ux.com>
Subject: [PATCH v2 0/3] 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

Pavel Begunkov (3):
  pcpu_ref: add percpu_ref_tryget_many()
  io_uring: batch getting pcpu references
  io_uring: batch get(ctx->ref) across submits

 fs/io_uring.c                   | 29 ++++++++++++++++++++++++++---
 include/linux/percpu-refcount.h | 26 +++++++++++++++++++++-----
 2 files changed, 47 insertions(+), 8 deletions(-)

-- 
2.24.0