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From: "Carter Li 李通洲" <[email protected]>
To: Jens Axboe <[email protected]>
Cc: io-uring <[email protected]>
Subject: Questions about IORING_OP_ASYNC_CANCEL usage
Date: Fri, 21 Aug 2020 05:17:17 +0000	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Hi Jens,

I have some ( maybe stupid ) questions about IORING_OP_ASYNC_CANCEL:

1. Does IORING_OP_ASYNC_CANCEL always complete inline ( i.e. finishes before the io_uring_enter syscall returns )?

2. Does recent changes of async buffered reads have any impact with cancelation? Can we cancel a buffered IORING_OP_READV operation after it’s started? Although the disk->kernel DMA operation is not cancelable, can we cancel the kernel->userland data copy?

3. I heard that all buffered writes are serialized on the inode mutex. If a buffered IORING_OP_WRITEV is blocked on the node mutex, can we cancel it?

Thanks in advance,
Carter

  reply	other threads:[~2020-08-21  5:17 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-25  0:39 [RFC] single cqe per link Pavel Begunkov
2020-02-25  2:14 ` Carter Li 李通洲
2020-02-25  2:36   ` Jens Axboe
2020-02-25  3:13     ` Jens Axboe
2020-02-25 10:12       ` Pavel Begunkov
2020-02-25 20:20         ` Jens Axboe
2020-02-25 21:13           ` Pavel Begunkov
2020-08-21  5:17             ` Carter Li 李通洲 [this message]
2020-08-21  5:20               ` Questions about IORING_OP_ASYNC_CANCEL usage Carter Li 李通洲
2020-02-25  2:24 ` [RFC] single cqe per link Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2020-08-21  5:22 Questions about IORING_OP_ASYNC_CANCEL usage Carter Li 李通洲

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