linux-kernel - Re: v4.8-rc1: thinkpad x60: running at low frequency even during kernel build

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Message-ID: <20161105132049.GC10310@amd>
Date:   Sat, 5 Nov 2016 14:20:49 +0100
From:   Pavel Machek <pavel@....cz>
To:     "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Zhang, Rui" <rui.zhang@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "ibm-acpi-devel@...ts.sourceforge.net" 
        <ibm-acpi-devel@...ts.sourceforge.net>,
        "ibm-acpi@....eng.br" <ibm-acpi@....eng.br>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: v4.8-rc1: thinkpad x60: running at low frequency even during
 kernel build

On Fri 2016-11-04 23:20:53, Pandruvada, Srinivas wrote:
> On Fri, 2016-11-04 at 23:16 +0100, Pavel Machek wrote:
> > Hi!
> > 
> 
> [...]
> 
> > So we seem to have thermal or ACPI regression in v4.9-rc3.
> > 
> It is possible. Can you add either add printk
> in acpi_processor_ppc_has_changed() or use ftrace and see do you get to
> these functions
> 
> acpi_processor_ppc_init()
> acpi_processor_ppc_has_changed()
> acpi_processor_ppc_notifier()
> 
> ?

Ok, can do, let me recompile and reboot.

> When temperature limit is reached acpi_processor_ppc_notifier() should
> be called.

No, that's not correct for ACPI passive trip points, is it? If I
recall correctly, those should be monitored even when temperature is
below them so that it does not reach them...?

								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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