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

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Date:   Wed, 18 Dec 2019 01:28:37 +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 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 performance boost, though with
a bit unconventional(/unrealistic?) workload.

There is still one step to add, which is not implemented with
patchset, and will amortise the effect calls to io_uring_enter().

rebased on top of for-5.6/io_uring

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

 fs/io_uring.c                   | 11 ++++++++---
 include/linux/percpu-refcount.h | 24 ++++++++++++++++++++----
 2 files changed, 28 insertions(+), 7 deletions(-)

-- 
2.24.0