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 14:15:34 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Vincent Guittot <vincent.guittot@...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

On 30.04.2024 2:00 PM, Vincent Guittot wrote:
> 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/

Yep, works now!

> 
>>
>> 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

As the log suggests, SM8550 QRD

Thanks for your prompt response!

Konrad