linux-kernel - Re: [PATCH liburing 1/1] test: add epoll test case

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Message-ID: <b1b26e79-507a-b339-2850-d2686661e669@kernel.dk>
Date:   Mon, 27 Jan 2020 09:32:43 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH liburing 1/1] test: add epoll test case

On 1/27/20 9:17 AM, Stefano Garzarella wrote:
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>

You're not reaping CQ events, and hence you overflow the ring. Once
overflown, an attempt to submit new IO will returns in a -16/-EBUSY
return value. This is io_uring telling you that it won't submit more
IO until you've emptied the completion ring so io_uring can flush
the overflown entries to the ring.

-- 
Jens Axboe