linux-kernel - Re: [PATCH 1/2] hrtimer: Document, that PI boosted tasks have no timer slack

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Message-ID: <20240805132749.jtD28XKa@linutronix.de>
Date: Mon, 5 Aug 2024 15:27:49 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Felix Moessbauer <felix.moessbauer@...mens.com>,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <frederic@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	jan.kiszka@...mens.com
Subject: Re: [PATCH 1/2] hrtimer: Document, that PI boosted tasks have no
 timer slack

On 2024-08-05 15:02:00 [+0200], Thomas Gleixner wrote:
> On Mon, Aug 05 2024 at 14:41, Felix Moessbauer wrote:
> > The documentation of schedule_hrtimeout_range already states, that RT
> > and DL tasks do not have a timer slack. However, no information about PI
> > boosted tasks is given. The current implementation consistently ignores
> > the timer slack also for PI boosted tasks (all tasks with a rt priority
> > at time of programming the timer).
> 
> Which is wrong. This condition should not use rt_task() it should use
> task_is_realtime() instead.

There is also the series 20240610192018.1567075-1-qyousef@...alina.io

> Thanks,
> 
>         tglx

Sebastian