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

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Message-Id: <DC79THC2NMDM.1BHGJPJHTYPTV@cknow.org>
Date: Wed, 20 Aug 2025 14:57:51 +0200
From: "Diederik de Haas" <didi.debian@...ow.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>, <linux-rockchip@...ts.infradead.org>
Subject: Re: [RFC PATCH 1/1] sched/deadline: Fix RT task potential
 starvation when expiry time passed

On Wed Jul 30, 2025 at 12:06 PM CEST, Geert Uytterhoeven wrote:
> On Mon, 16 Jun 2025 at 14:39, Kuyo Chang <kuyo.chang@...iatek.com> wrote:
>> From: kuyo chang <kuyo.chang@...iatek.com>
>>
>> [Analysis]
>> ---------
>> The log "sched: DL replenish lagged too much" triggered.
>>
>> 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>

I was seeing this warning as well on several of my Rockchip based
devices, but that is gone after applying this patch. Thanks!

Tested-by: Diederik de Haas <didi.debian@...ow.org>

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