linux-kernel - Re: [PATCH v6 4/5] sched: Rename arch_update_thermal_pressure into arch_update_hw

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Date: Tue, 30 Apr 2024 14:00:46 +0200
From: Vincent Guittot <vincent.guittot@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: linux@...linux.org.uk, catalin.marinas@....com, will@...nel.org, 
	sudeep.holla@....com, rafael@...nel.org, viresh.kumar@...aro.org, 
	agross@...nel.org, andersson@...nel.org, mingo@...hat.com, 
	peterz@...radead.org, juri.lelli@...hat.com, dietmar.eggemann@....com, 
	rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, 
	vschneid@...hat.com, lukasz.luba@....com, rui.zhang@...el.com, 
	mhiramat@...nel.org, daniel.lezcano@...aro.org, amit.kachhap@...il.com, 
	corbet@....net, gregkh@...uxfoundation.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
	Qais Yousef <qyousef@...alina.io>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v6 4/5] sched: Rename arch_update_thermal_pressure into arch_update_hw_pressure

H Konrad,

On Tue, 30 Apr 2024 at 13:23, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
> On 26.03.2024 10:16 AM, Vincent Guittot wrote:
> > Now that cpufreq provides a pressure value to the scheduler, rename
> > arch_update_thermal_pressure into HW pressure to reflect that it returns
> > a pressure applied by HW (i.e. with a high frequency change) and not
> > always related to thermal mitigation but also generated by max current
> > limitation as an example. Such high frequency signal needs filtering to be
> > smoothed and provide an value that reflects the average available capacity
> > into the scheduler time scale.
> >
> > Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> > Reviewed-by: Qais Yousef <qyousef@...alina.io>
> > Reviewed-by: Lukasz Luba <lukasz.luba@....com>
> > Tested-by: Lukasz Luba <lukasz.luba@....com>
> > ---
>
> Hi, I'm not quite sure how, but this commit specifically breaks booting
> on Qualcomm platforms with EAS..

This is the fix:
https://lore.kernel.org/lkml/20240425073709.379016-1-vincent.guittot@linaro.org/

>
> https://pastebin.com/raw/1Uh7u81x

Which platform is it ?
I tested it on dragonboard rb3 and it booted and run tests  even w/o the fix

>
> Konrad