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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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>

[...]