linux-kernel - Re: stable: commit "cpuidle: menu: Avoid discarding useful information" causes regressions

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Message-ID: <CAJZ5v0inu-Ty-hh0owS0z0Q+d1Ck7KUR_kHQvUCVOc1SZFqyjw@mail.gmail.com>
Date: Thu, 16 Oct 2025 11:48:46 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: Doug Smythies <dsmythies@...us.net>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Christian Loehle <christian.loehle@....com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>, Sasha Levin <sashal@...nel.org>, 
	Daniel Lezcano <daniel.lezcano@...aro.org>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Tomasz Figa <tfiga@...omium.org>, stable@...r.kernel.org
Subject: Re: stable: commit "cpuidle: menu: Avoid discarding useful
 information" causes regressions

On Thu, Oct 16, 2025 at 6:59 AM Sergey Senozhatsky
<senozhatsky@...omium.org> wrote:
>
> On (25/10/15 07:11), Doug Smythies wrote:
> > >> What thermal limiting methods are being used? Is idle injection being used? Or CPU frequency limiting or both.
> > >
> > > How do I find out?
> >
> > From the turbostat data you do not appear to be using the TCC offset method. This line:
> >
> > cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x0f690080 (105 C)
> >
> > whereas on my test computer, using the TCC offset method, shows:
> >
> >  cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x14641422 (80 C) (100 default - 20 offset)
> >
> > To check if thermal is being used do:
> >
> > systemctl status thermal
>
> chromeos doesn't use systemd.
> A quick ps grep doesn't show any thermal-related processes.

All right, let's see what RAPL on that system has to say.

Please send the output of "grep .
/sys/class/powercap/intel-rapl/intel-rapl:0/constraint_*"