From: Jens Axboe <[email protected]>
To: Hao Xu <[email protected]>, [email protected]
Cc: [email protected],
[email protected]
Subject: Re: [PATCH v2 2/2] io_uring: ensure task_work gets run as part of cancelations
Date: Thu, 9 Dec 2021 21:22:43 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 12/9/21 8:29 PM, Hao Xu wrote:
>
> 在 2021/12/10 上午12:16, Jens Axboe 写道:
>> If we successfully cancel a work item but that work item needs to be
>> processed through task_work, then we can be sleeping uninterruptibly
>> in io_uring_cancel_generic() and never process it. Hence we don't
>> make forward progress and we end up with an uninterruptible sleep
>> warning.
>>
>> Add the waitqueue earlier to ensure that any wakeups from cancelations
>> are seen, and switch to using uninterruptible sleep so that postponed
> ^ typo
Not really a typo, but should be killed from v2 for sure. I'll do that.
--
Jens Axboe
next prev parent reply other threads:[~2021-12-10 4:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-09 15:59 [PATCHSET 0/2] Cancelation fixes Jens Axboe
2021-12-09 15:59 ` [PATCH 1/2] io_uring: check tctx->in_idle when decrementing inflight_tracked Jens Axboe
2021-12-10 7:21 ` Hao Xu
2021-12-10 13:47 ` Jens Axboe
2021-12-09 15:59 ` [PATCH 2/2] io_uring: ensure task_work gets run as part of cancelations Jens Axboe
2021-12-09 16:16 ` [PATCH v2 " Jens Axboe
2021-12-10 3:29 ` Hao Xu
2021-12-10 4:22 ` Jens Axboe [this message]
2021-12-10 7:31 ` Hao Xu
2021-12-10 13:45 ` Jens Axboe
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