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From: Olivier Langlois <olivier@trillion01.com>
To: Nadav Amit <nadav.amit@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	io-uring@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Pavel Begunkov <asml.silence@gmail.com>
Subject: Re: [PATCH 1/2] io_uring: clear TIF_NOTIFY_SIGNAL when running task work
Date: Tue, 10 Aug 2021 09:33:30 -0400	[thread overview]
Message-ID: <a65c7dc0e836b90fa0dd67e26ed2f14f6831c262.camel@trillion01.com> (raw)
In-Reply-To: <A4DC14BA-74CA-41DB-BE08-D7B693C11AE0@gmail.com>

On Tue, 2021-08-10 at 01:28 -0700, Nadav Amit wrote:
> 
> Happy it could help.
> 
> Unfortunately, there seems to be yet another issue (unless my code
> somehow caused it). It seems that when SQPOLL is used, there are
> cases
> in which we get stuck in io_uring_cancel_sqpoll() when
> tctx_inflight()
> never goes down to zero.
> 
> Debugging... (while also trying to make some progress with my code)

You are on something. io_uring starts to be very solid but it isn't
100% flawless yet.

I am a heavy user of SQPOLL which now run flawlessly for me with 5.13.9
(Was running flawlessly since 5.12 minus few patches I did submit
recently) with my simple use-case (my SQPOLL thread isn't spawning any
threads like in your use-case).

The best is yet to come. I'm salivating by seeing all the performance
optimizations that Jens and Pavel are putting in place lately...



  reply	other threads:[~2021-08-10 13:33 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-08  0:13 [PATCH 0/2] io_uring: bug fixes Nadav Amit
2021-08-08  0:13 ` [PATCH 1/2] io_uring: clear TIF_NOTIFY_SIGNAL when running task work Nadav Amit
2021-08-08 12:55   ` Pavel Begunkov
2021-08-08 17:31     ` Nadav Amit
2021-08-09  4:07       ` Hao Xu
2021-08-09  4:50         ` Nadav Amit
2021-08-09 10:35           ` Pavel Begunkov
2021-08-09 10:18       ` Pavel Begunkov
2021-08-09 21:48   ` Olivier Langlois
2021-08-10  8:28     ` Nadav Amit
2021-08-10 13:33       ` Olivier Langlois [this message]
2021-08-10 21:32       ` Pavel Begunkov
2021-08-11  2:33         ` Nadav Amit
2021-08-11  2:51           ` Jens Axboe
2021-08-11  5:40             ` I/O cancellation in io-uring (was: io_uring: clear TIF_NOTIFY_SIGNAL ...) Nadav Amit
2021-08-08  0:13 ` [PATCH 2/2] io_uring: Use WRITE_ONCE() when writing to sq_flags Nadav Amit
2021-08-09 13:53 ` [PATCH 0/2] io_uring: bug fixes Jens Axboe

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