linux-kernel - Re: [PATCH v3] io_uring: reduce latency by reissueing the operation

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Message-ID: <82b94c49-b18d-94b2-cb8d-43cf54e402f3@kernel.dk>
Date:   Mon, 21 Jun 2021 14:05:24 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Olivier Langlois <olivier@...llion01.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        io-uring@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] io_uring: reduce latency by reissueing the operation

On 6/21/21 1:22 PM, Olivier Langlois wrote:
> It is quite frequent that when an operation fails and returns EAGAIN,
> the data becomes available between that failure and the call to
> vfs_poll() done by io_arm_poll_handler().
> 
> Detecting the situation and reissuing the operation is much faster
> than going ahead and push the operation to the io-wq.

This now looks pretty good to me. I know you had some data associated
with this, would be great to include it in the commit message.

-- 
Jens Axboe