linux-kernel - Re: [PATCH v2 0/1] hrtimer: More fixes for handling of timer slack of rt tasks

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Message-ID: <20240809013433.pazaymcdx37lhpau@airbuntu>
Date: Fri, 9 Aug 2024 02:34:33 +0100
From: Qais Yousef <qyousef@...alina.io>
To: Felix Moessbauer <felix.moessbauer@...mens.com>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	jan.kiszka@...mens.com,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH v2 0/1] hrtimer: More fixes for handling of timer slack
 of rt tasks

On 08/05/24 16:09, Felix Moessbauer wrote:
> This series fixes the (hopefully) last location of an incorrectly
> handled timer slack on rt tasks in hrtimer_start_range_ns(), which was
> uncovered by a userland change in glibc 2.33.
> 
> Changes since v1:
> 
> - drop patch "hrtimer: Document, that PI boosted tasks have no timer slack", as
>   this behavior is incorrect and is already adressed in 20240610192018.1567075-1-qyousef@...alina.io

There was discussion about this hrtimer usage in earlier version if it helps to
come up with a potentially better patch

	https://lore.kernel.org/lkml/20240521110035.KRIwllGe@linutronix.de/

My patches got picked up by the way, you'd probably want to rebase and resend
as now the function is named rt_or_dl_task_policy()


Cheers

--
Qais Yousef

> - use task_is_realtime() instead of rt_task()
> - fix style of commit message
> 
> v1 discussion: https://lore.kernel.org/lkml/20240805124116.21394-1-felix.moessbauer@siemens.com
> 
> Best regards,
> Felix Moessbauer
> Siemens AG
> 
> Felix Moessbauer (1):
>   hrtimer: Ignore slack time for RT tasks in hrtimer_start_range_ns()
> 
>  kernel/time/hrtimer.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> -- 
> 2.39.2
>