Re: [PATCH v2] io_uring: don't wait when under-submitting

From: Pavel Begunkov
Date: Sat Dec 14 2019 - 09:44:56 EST

On 14/12/2019 17:39, Jens Axboe wrote:
> On 12/14/19 7:31 AM, Pavel Begunkov wrote:
>> There is no reliable way to submit and wait in a single syscall, as
>> io_submit_sqes() may under-consume sqes (in case of an early error).
>> Then it will wait for not-yet-submitted requests, deadlocking the user
>> in most cases.
>> Don't wait/poll if can't submit all sqes, and return -EAGAIN
>> Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
>> ---
>> v2: cap min_complete if submitted partially (Jens Axboe)
> Can you update the commit message as well, doesn't really reflect the
> current state of it... Apart from that, looks good to me!
Right, thanks for noticing!

Pavel Begunkov

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