From: Jens Axboe <[email protected]>
To: Almog Khaikin <[email protected]>, [email protected]
Cc: [email protected]
Subject: Re: [PATCH v2] io_uring: fix memory ordering when SQPOLL thread goes to sleep
Date: Mon, 21 Mar 2022 06:33:43 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On Mon, 21 Mar 2022 11:00:59 +0200, Almog Khaikin wrote:
> Without a full memory barrier between the store to the flags and the
> load of the SQ tail the two operations can be reordered and this can
> lead to a situation where the SQPOLL thread goes to sleep while the
> application writes to the SQ tail and doesn't see the wakeup flag.
> This memory barrier pairs with a full memory barrier in the application
> between its store to the SQ tail and its load of the flags.
>
> [...]
Applied, thanks!
[1/1] io_uring: fix memory ordering when SQPOLL thread goes to sleep
commit: 649bb75d19c93f5459f450191953dff4825fda3e
Best regards,
--
Jens Axboe
prev parent reply other threads:[~2022-03-21 12:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 9:00 [PATCH v2] io_uring: fix memory ordering when SQPOLL thread goes to sleep Almog Khaikin
2022-03-21 12:33 ` Jens Axboe [this message]
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