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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: John Mathew <john.mathew@unikie.com>
Cc: linux-rt-users@vger.kernel.org
Subject: Re: complete_all() with x waiters in swake_up_all_locked
Date: Thu, 12 Dec 2019 18:12:30 +0100
Message-ID: <20191212171230.ygveclhr5xqurys7@linutronix.de> (raw)
In-Reply-To: <CAJz2qXnHnw7Z9ftb6Oha5_0-R4YfUL+FhVZPNX1KKHyUkP6KNA@mail.gmail.com>

On 2019-12-11 09:17:49 [+0200], John Mathew wrote:
> Hi,
Hi,

> We are seeing the waring still appearing in the v5.0.3-rt1 tag of the
> rt linux kernel.

I didn't managed to reproduce it at the time. Now you say it works with
5.0-RT. I will try to give it a spin with the latest RT sometime next
week.

> 
> Has there been any further investigation in to this warning following
> the previous discussion?

Thanks for report. I didn't manage to reproduce it so no. The actual
problem is that we are trying to figure out what a sane limit for
complete_all() might be. Most users of complete_all() have one two
waiters. Based on that report your max was 8 and that occurred a few
times.

> -John

Sebastian

  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-11  7:17 John Mathew
2019-12-12 17:12 ` Sebastian Andrzej Siewior [this message]
2019-12-13  9:08   ` John Mathew
2019-12-18 16:53     ` Sebastian Andrzej Siewior
2019-12-31 10:00       ` [PATCH] crypto: only wait for completion once John Mathew
2020-01-14 12:47         ` Sebastian Andrzej Siewior
2020-02-11 11:48           ` John Mathew
2020-02-11 12:04             ` Sebastian Andrzej Siewior
2020-02-11 15:52               ` John Mathew
2020-02-11 15:59                 ` Sebastian Andrzej Siewior
2020-02-12 12:55                   ` John Mathew
2020-02-12 17:02                     ` Sebastian Andrzej Siewior
2020-02-13  6:58                       ` John Mathew
2020-02-13  8:31                         ` Sebastian Andrzej Siewior
2020-02-18  7:18                           ` [PATCH] swait: Increase number of waiters for warning John Mathew
2020-03-20 16:54                             ` [PATCH RT] swait: Remove the warning with more than two waiters Sebastian Andrzej Siewior

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