linux-kernel - Re: [RFC PATCH v2 7/7] sched/fair: alternative way of accounting throttle time

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Message-ID: <20250508024525.GA628019@bytedance>
Date: Thu, 8 May 2025 10:45:25 +0800
From: Aaron Lu <ziqianlu@...edance.com>
To: Florian Bezdeka <florian.bezdeka@...mens.com>
Cc: Valentin Schneider <vschneid@...hat.com>,
	Ben Segall <bsegall@...gle.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Don <joshdon@...gle.com>, Ingo Molnar <mingo@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Xi Wang <xii@...gle.com>, linux-kernel@...r.kernel.org,
	Juri Lelli <juri.lelli@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>, Mel Gorman <mgorman@...e.de>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Chuyi Zhou <zhouchuyi@...edance.com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [RFC PATCH v2 7/7] sched/fair: alternative way of accounting
 throttle time

On Wed, May 07, 2025 at 11:33:42AM +0200, Florian Bezdeka wrote:
> On Wed, 2025-05-07 at 17:09 +0800, Aaron Lu wrote:
... ...
> > It's just the warn_on_once() itself is incorrect, I'll remove it in next
> > version, thanks for the report!
> 
> You're welcome. IOW: I can ignore the warning. Great.
>

Right :-)

> I meanwhile forward ported the 5.15 based series that you provided to
> 6.1 and applied massive testing in our lab. It looks very promising up
> to now. Our freeze seems solved now.
> 

Good to know this.

> Thanks for you're help! Very much appreciated!
> 

You are welcome.

> We updated one device in the field today - at customer site. It will
> take another week until I can report success. Let's hope.
> 
> The tests based on 6.14 are also looking good.
> 
> To sum up: This series fixes (or seems to fix, let's wait for one more
> week to be sure) a critical RT issue. Is there a chance that once we
> made it into mainline that we see (official) backports? 6.12 or 6.1
> would be nice.

I don't think there will be official backports if this series entered
mainline because stable kernels only take fixes while this series changed
throttle behavior dramatically. Of course, this is just my personal
view, and the maintainer will make the final decision.

Thanks,
Aaron