linux-kernel - Re: [RFC PATCH 1/1] sched/deadline: Fix RT task potential starvation when expiry time passed

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Message-ID: <bb52ebe6-a3b0-428e-8c97-d7366dedae92@kernel.org>
Date: Fri, 15 Aug 2025 06:35:32 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>,
 Kuyo Chang <kuyo.chang@...iatek.com>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 jstultz <jstultz@...gle.com>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [RFC PATCH 1/1] sched/deadline: Fix RT task potential starvation
 when expiry time passed

On 30. 07. 25, 12:06, Geert Uytterhoeven wrote:
>> [Proposed Solution]:
>> ------------------
>> Instead of immediately re-enqueuing the DL entity on timer registration
>> failure, this change ensures the DL entity is properly replenished and
>> the timer is restarted, preventing RT potential starvation.
>>
>> Signed-off-by: kuyo chang <kuyo.chang@...iatek.com>
> 
> Thanks, this fixes the issue I was seeing!
> 
> Closes: https://lore.kernel.org/CAMuHMdXn4z1pioTtBGMfQM0jsLviqS2jwysaWXpoLxWYoGa82w@mail.gmail.com
> Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>

As well as:
Closes: 
https://lore.kernel.org/all/58c46200-95b0-4cd8-bb5e-44f963a66875@kernel.org/
Tested-by: Jiri Slaby <jirislaby@...nel.org>

thanks,
-- 
js
suse labs