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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, Hao Xu <[email protected]>,
	[email protected]
Cc: [email protected]
Subject: Re: [PATCH v2 0/5] fast poll multishot mode
Date: Fri, 6 May 2022 17:01:25 +0100	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 5/6/22 15:18, Jens Axboe wrote:
> On 5/6/22 1:36 AM, Hao Xu wrote:
>> Hi All,
>> I actually had a question about the current poll code, from the code it
>> seems when we cancel a poll-like request, it will ignore the existing
>> events and just raise a -ECANCELED cqe though I haven't tested it. Is
>> this by design or am I missing something?
> 
> That's by design, but honestly I don't think anyone considered the case
> where it's being canceled but has events already. For that case, I think
> we should follow the usual logic of only returning an error (canceled)
> if we don't have events, if we have events just return them. For
> multi-shot, obviously also terminate, but same logic there.

Why would we care? It's inherently racy in any case and any
user not handling this is already screwed.

-- 
Pavel Begunkov

  reply	other threads:[~2022-05-06 16:01 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-06  7:00 [PATCH v2 0/5] fast poll multishot mode Hao Xu
2022-05-06  7:00 ` [PATCH 1/5] io_uring: add IORING_ACCEPT_MULTISHOT for accept Hao Xu
2022-05-06 14:32   ` Jens Axboe
2022-05-07  4:05     ` Hao Xu
2022-05-06  7:00 ` [PATCH 2/5] io_uring: add REQ_F_APOLL_MULTISHOT for requests Hao Xu
2022-05-06  7:01 ` [PATCH 3/5] io_uring: let fast poll support multishot Hao Xu
2022-05-06 17:19   ` Pavel Begunkov
2022-05-06 22:02     ` Jens Axboe
2022-05-07  6:32       ` Hao Xu
2022-05-07  9:26       ` Pavel Begunkov
2022-05-07  7:08     ` Hao Xu
2022-05-07  9:47       ` Pavel Begunkov
2022-05-07 11:06         ` Hao Xu
2022-05-06 18:02   ` kernel test robot
2022-05-06  7:01 ` [PATCH 4/5] io_uring: add a helper for poll clean Hao Xu
2022-05-06 11:04   ` kernel test robot
2022-05-06 12:47   ` kernel test robot
2022-05-06 14:36   ` Jens Axboe
2022-05-07  6:37     ` Hao Xu
2022-05-06 16:22   ` Pavel Begunkov
2022-05-07  6:43     ` Hao Xu
2022-05-07  9:29       ` Pavel Begunkov
2022-05-06  7:01 ` [PATCH 5/5] io_uring: implement multishot mode for accept Hao Xu
2022-05-06 14:42   ` Jens Axboe
2022-05-07  9:13     ` Hao Xu
2022-05-06 20:50   ` Jens Axboe
2022-05-06 21:29     ` Jens Axboe
2022-05-06  7:36 ` [PATCH v2 0/5] fast poll multishot mode Hao Xu
2022-05-06 14:18   ` Jens Axboe
2022-05-06 16:01     ` Pavel Begunkov [this message]
2022-05-06 16:03       ` Jens Axboe
2022-05-06 22:23 ` Jens Axboe
2022-05-06 23:26   ` Jens Axboe
2022-05-07  2:33     ` Jens Axboe
2022-05-07  3:08       ` Jens Axboe
2022-05-07 16:01         ` Hao Xu

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