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

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Message-ID: <87cymn5div.ffs@tglx>
Date: Mon, 05 Aug 2024 15:02:00 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Felix Moessbauer <felix.moessbauer@...mens.com>,
 linux-kernel@...r.kernel.org
Cc: Frederic Weisbecker <frederic@...nel.org>, Anna-Maria Behnsen
 <anna-maria@...utronix.de>, jan.kiszka@...mens.com, Felix Moessbauer
 <felix.moessbauer@...mens.com>, Sebastian Andrzej Siewior
 <bigeasy@...utronix.de>
Subject: Re: [PATCH 1/2] hrtimer: Document, that PI boosted tasks have no
 timer slack

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.

> This patch improves the documentation by stating that the timer slack
> is

git grep "This patch" Documentation/process/

Thanks,

        tglx