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Date:   Fri, 15 Oct 2021 13:13:47 +0100
From:   Lukasz Luba <>
To:     Thara Gopinath <>
Subject: Re: [PATCH 3/5] cpufreq: qcom-cpufreq-hw: Update offline CPUs per-cpu
 thermal pressure

On 10/11/21 10:17 PM, Thara Gopinath wrote:
> On 10/7/21 4:07 AM, Lukasz Luba wrote:
>> The thermal pressure signal gives information to the scheduler about
>> reduced CPU capacity due to thermal. It is based on a value stored in
>> a per-cpu 'thermal_pressure' variable. The online CPUs will get the
>> new value there, while the offline won't. Unfortunately, when the CPU
>> is back online, the value read from per-cpu variable might be wrong
>> (stale data).  This might affect the scheduler decisions, since it
>> sees the CPU capacity differently than what is actually available.
>> Fix it by making sure that all online+offline CPUs would get the
>> proper value in their per-cpu variable when there is throttling
>> or throttling is removed.
>> Fixes: 275157b367f479 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt 
>> support")
>> Signed-off-by: Lukasz Luba <>
> Thanks for the fix.
> Reviewed-by: Thara Gopinath <>

Thank you for the review!

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