From: Jens Axboe <[email protected]>
To: Pavel Begunkov <[email protected]>,
Avi Kivity <[email protected]>,
[email protected]
Subject: Re: IORING_OP_POLL_ADD slower than linux-aio IOCB_CMD_POLL
Date: Wed, 15 Jun 2022 06:21:21 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 6/15/22 5:38 AM, Pavel Begunkov wrote:
>>>> Another way is to also set IORING_SETUP_TASKRUN_FLAG, then when
>>>> there is work that requires to enter the kernel io_uring will
>>>> set IORING_SQ_TASKRUN in sq_flags.
>>>> Actually, I'm not mistaken io_uring has some automagic handling
>>>> of it internally
>>>>
>>>> https://github.com/axboe/liburing/blob/master/src/queue.c#L36
>>>>
>>
>> Is there documentation about this flag?
>
> Unfortunately, I don't see any.
> Here is a link to the kernel commit if it helps:
>
> https://git.kernel.dk/cgit/linux-block/commit/?h=ef060ea9e4fd3b763e7060a3af0a258d2d5d7c0d
>
> I think it's more interesting what support liburing has,
> but would need to look up in the code. Maybe Jens
> remembers and can tell.
It is documented, in the io_uring.2 man page in liburing:
https://git.kernel.dk/cgit/liburing/tree/man/io_uring_setup.2#n200
--
Jens Axboe
next prev parent reply other threads:[~2022-06-15 12:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-19 11:07 IORING_OP_POLL_ADD slower than linux-aio IOCB_CMD_POLL Avi Kivity
2022-04-19 11:38 ` Jens Axboe
2022-04-19 11:57 ` Avi Kivity
2022-04-19 12:04 ` Jens Axboe
2022-04-19 12:21 ` Avi Kivity
2022-04-19 12:31 ` Jens Axboe
2022-04-19 15:21 ` Jens Axboe
2022-04-19 15:51 ` Avi Kivity
2022-04-19 17:14 ` Jens Axboe
2022-04-19 19:41 ` Avi Kivity
2022-04-19 19:58 ` Jens Axboe
2022-04-20 11:55 ` Avi Kivity
2022-04-20 12:09 ` Jens Axboe
2022-04-21 9:05 ` Avi Kivity
2022-06-15 10:12 ` Avi Kivity
2022-06-15 10:48 ` Pavel Begunkov
2022-06-15 11:04 ` Avi Kivity
2022-06-15 11:07 ` Avi Kivity
2022-06-15 11:38 ` Pavel Begunkov
2022-06-15 12:21 ` Jens Axboe [this message]
2022-06-15 13:43 ` Avi Kivity
2022-06-15 11:30 ` Pavel Begunkov
2022-06-15 11:36 ` Avi Kivity
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