linux-kernel - Re: [PATCH v4 1/5] arch_topology: Introduce thermal pressure update function

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Date:   Tue, 23 Nov 2021 09:09:21 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, steev@...i.org,
        sudeep.holla@....com, will@...nel.org, catalin.marinas@....com,
        linux@...linux.org.uk, gregkh@...uxfoundation.org,
        rafael@...nel.org, viresh.kumar@...aro.org, amitk@...nel.org,
        daniel.lezcano@...aro.org, amit.kachhap@...il.com,
        bjorn.andersson@...aro.org, agross@...nel.org
Subject: Re: [PATCH v4 1/5] arch_topology: Introduce thermal pressure update
 function



On 11/16/21 11:39 PM, Thara Gopinath wrote:
> 
> 
> On 11/9/21 2:57 PM, Lukasz Luba wrote:
>> The thermal pressure is a mechanism which is used for providing
>> information about reduced CPU performance to the scheduler. Usually code
>> has to convert the value from frequency units into capacity units,
>> which are understandable by the scheduler. Create a common conversion 
>> code
>> which can be just used via a handy API.
>>
>> Internally, the topology_update_thermal_pressure() operates on frequency
>> in MHz and max CPU frequency is taken from 'freq_factor' (per-cpu).
>>
>> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> 
> Reviewed-by: Thara Gopinath <thara.gopinath@...aro.org>
> 

Thank you Thara for the review!