linux-kernel - Re: [PATCH v5 1/2] io_uring: minor io_cqring

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Message-ID: <7f39095c-1070-7a70-91a0-b0ccb33c368b@kernel.dk>
Date:   Tue, 8 Mar 2022 17:54:07 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Olivier Langlois <olivier@...llion01.com>,
        Pavel Begunkov <asml.silence@...il.com>
Cc:     Hao Xu <haoxu@...ux.alibaba.com>,
        io-uring <io-uring@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] io_uring: minor io_cqring_wait() optimization

On 3/8/22 3:17 PM, Olivier Langlois wrote:
> Move up the block manipulating the sig variable to execute code
> that may encounter an error and exit first before continuing
> executing the rest of the function and avoid useless computations

I don't think this is worthwhile doing. If you're hitting an error
in any of them, it's by definition not the fast path.

-- 
Jens Axboe