linux-kernel - Re: [PATCH] prinkt/nbcon: Add a scheduling point to nbcon_kthread

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Message-ID: <874j9n5c3i.fsf@jogness.linutronix.de>
Date: Fri, 21 Jun 2024 03:22:49 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Derek Barbosa
 <debarbos@...hat.com>
Cc: pmladek@...e.com, rostedt@...dmis.org, senozhatsky@...omium.org,
 linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 williams@...hat.com, jlelli@...hat.com, ahalaney@...hat.com,
 lgoncalv@...hat.com, jwyatt@...hat.com, aubaker@...hat.com
Subject: Re: [PATCH] prinkt/nbcon: Add a scheduling point to
 nbcon_kthread_func().

On 2024-06-20, Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> Constant printing can lead to a CPU hog in nbcon_kthread_func(). The
> context is preemptible but on !PREEMPT kernels there is no explicit
> preemption point which leads softlockup warnings.
>
> Add an explicit preemption point in nbcon_kthread_func().
>
> Reported-by: Derek Barbosa <debarbos@...hat.com>
> Link: https://lore.kernel.org/ZnHF5j1DUDjN1kkq@debarbos-thinkpadt14sgen2i.remote.csb
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Reviewed-by: John Ogness <john.ogness@...utronix.de>