linux-kernel - Re: [PATCH v2 1/1] Add a new sysctl to disable io

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Date:   Thu, 29 Jun 2023 10:37:36 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Matteo Rizzo <matteorizzo@...gle.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org, jordyzomer@...gle.com, evn@...gle.com,
        poprdi@...gle.com, corbet@....net, axboe@...nel.dk,
        asml.silence@...il.com, akpm@...ux-foundation.org,
        keescook@...omium.org, rostedt@...dmis.org,
        dave.hansen@...ux.intel.com, ribalda@...omium.org,
        chenhuacai@...nel.org, steve@....org, gpiccoli@...lia.com,
        ldufour@...ux.ibm.com, bhe@...hat.com, oleksandr@...alenko.name
Subject: Re: [PATCH v2 1/1] Add a new sysctl to disable io_uring system-wide

On 6/29/23 08:28, Matteo Rizzo wrote:
> On Thu, 29 Jun 2023 at 17:16, Bart Van Assche <bvanassche@....org> wrote:
>>
>> On 6/29/23 06:27, Matteo Rizzo wrote:
>>> +static int __read_mostly sysctl_io_uring_disabled;
>>
>> Shouldn't this be a static key instead of an int in order to minimize the
>> performance impact on the io_uring_setup() system call? See also
>> Documentation/staging/static-keys.rst.
>>
> Is io_uring_setup in any hot path? io_uring_create is marked as __cold.

I confused io_uring_setup() with io_uring_enter() so please ignore my comment.

Bart.