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From: Jens Axboe <axboe@kernel.dk>
To: Hao Xu <haoxu@linux.alibaba.com>
Cc: io-uring@vger.kernel.org, Pavel Begunkov <asml.silence@gmail.com>,
	Joseph Qi <joseph.qi@linux.alibaba.com>
Subject: Re: [PATCH] io_uring: check sqring and iopoll_list before shedule
Date: Fri, 23 Apr 2021 08:27:17 -0600	[thread overview]
Message-ID: <3f897cae-028b-0728-1473-5f6a08877745@kernel.dk> (raw)
In-Reply-To: <1619018351-75883-1-git-send-email-haoxu@linux.alibaba.com>

On 4/21/21 9:19 AM, Hao Xu wrote:
> do this to avoid race below:
> 
>          userspace                         kernel
> 
>                                |  check sqring and iopoll_list
> submit sqe                     |
> check IORING_SQ_NEED_WAKEUP    |
> (which is not set)    |        |
>                                |  set IORING_SQ_NEED_WAKEUP
> wait cqe                       |  schedule(never wakeup again)

Applied, thanks.

-- 
Jens Axboe


      parent reply	other threads:[~2021-04-23 14:27 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21 15:19 [PATCH] io_uring: check sqring and iopoll_list before shedule Hao Xu
2021-04-21 15:46 ` Hao Xu
2021-04-23 14:11 ` Pavel Begunkov
2021-04-23 14:27 ` Jens Axboe [this message]

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