linux-kernel - Re: [PATCH 1/2] x86, mce, therm_throt: Optimize logging of thermal throttle messages

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Message-ID: <20191018064642.GA17053@zn.tnic>
Date:   Fri, 18 Oct 2019 08:46:42 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "bberg@...hat.com" <bberg@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "ckellner@...hat.com" <ckellner@...hat.com>
Subject: Re: [PATCH 1/2] x86, mce, therm_throt: Optimize logging of thermal
 throttle messages

On Thu, Oct 17, 2019 at 11:53:18PM +0000, Luck, Tony wrote:
> > * we throttle the machine from within the kernel - whatever that may mean
> > * if that doesn't help, we stop scheduling !root tasks
> > * if that doesn't help, we halt
> 
> The silicon will do that "halt" step all by itself if the temperature
> continues to rise and hits the highest of the temperature thresholds.

Oh, I know that. But that is not of our concern - I believe we're
discussing right now what to do when the lower, softer limits are
reached and the thermal interrupt fires.

When the hw forces HLT, it means we didn't do a very good job earlier,
before it got so hot.

:-)

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette