linux-kernel - Re: [PATCH 5/6] cpuidle: teo: Remove recent intercepts metric

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Message-ID: <96eb4e13-e1c7-4c64-a4bf-0d2b5610d390@arm.com>
Date: Fri, 7 Jun 2024 10:57:10 +0200
From: Dietmar Eggemann <dietmar.eggemann@....com>
To: Christian Loehle <christian.loehle@....com>, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org, rafael@...nel.org
Cc: vincent.guittot@...aro.org, qyousef@...alina.io, peterz@...radead.org,
 daniel.lezcano@...aro.org, anna-maria@...utronix.de,
 kajetan.puchalski@....com, lukasz.luba@....com
Subject: Re: [PATCH 5/6] cpuidle: teo: Remove recent intercepts metric

On 06/06/2024 11:00, Christian Loehle wrote:
> The logic for recent intercepts didn't work, there is an underflow
> that can be observed during boot already, which teo usually doesn't
> recover from, making the entire logic pointless.

Is this related to:

https://lkml.kernel.org/r/0ce2d536-1125-4df8-9a5b-0d5e389cd8af@arm.com ?

In this case, a link here would be helpful to get the story.

> Furthermore the recent intercepts also were never reset, thus not
> actually being very 'recent'.
> 
> If it turns out to be necessary to focus more heavily on resets, the
> intercepts metric also could be adjusted to decay more quickly.
> 
> Fixes: 77577558f25d ("cpuidle: teo: Rework most recent idle duration values treatment")
> Signed-off-by: Christian Loehle <christian.loehle@....com>

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