linux-kernel - Re: [PATCH v2 0/2] optimise blk_try_enter

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Message-Id: <163482705916.41758.93518625125015139.b4-ty@kernel.dk>
Date:   Thu, 21 Oct 2021 08:37:39 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>,
        linux-block@...r.kernel.org
Cc:     Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH v2 0/2] optimise blk_try_enter_queue()

On Thu, 21 Oct 2021 14:30:50 +0100, Pavel Begunkov wrote:
> Kill extra rcu_read_lock/unlock() pair in blk_try_enter_queue().
> Testing with io_uring (high batching) with nullblk:
> 
> Before:
> 3.20%  io_uring  [kernel.vmlinux]  [k] __rcu_read_unlock
> 3.05%  io_uring  [kernel.vmlinux]  [k] __rcu_read_lock
> 
> [...]

Applied, thanks!

[1/2] percpu_ref: percpu_ref_tryget_live() version holding RCU
      commit: 3b13c168186c115501ee7d194460ba2f8c825155
[2/2] block: kill extra rcu lock/unlock in queue enter
      commit: e94f68527a35271131cdf9d3fb4eb3c2513dc3d0

Best regards,
-- 
Jens Axboe