linux-kernel - Re: [PATCH v4 1/3] arm64: defconfig: Enable CONFIG_ENERGY

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Date:   Wed, 15 May 2019 10:46:09 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Quentin Perret <quentin.perret@....com>, edubezval@...il.com,
        rui.zhang@...el.com, javi.merino@...nel.org,
        viresh.kumar@...aro.org, amit.kachhap@...il.com, rjw@...ysocki.net,
        will.deacon@....com, catalin.marinas@....com
Cc:     dietmar.eggemann@....com, ionela.voinescu@....com,
        mka@...omium.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] arm64: defconfig: Enable CONFIG_ENERGY_MODEL

On 15/05/2019 10:23, Quentin Perret wrote:
> The recently introduced Energy Model (EM) framework manages power cost
> tables for the CPUs of the system. Its only user right now is the
> scheduler, in the context of Energy Aware Scheduling (EAS).
> 
> However, the EM framework also offers a generic infrastructure that
> could replace subsystem-specific implementations of the same concepts,
> as this is the case in the thermal framework.
> 
> So, in order to prepare the migration of the thermal subsystem to use
> the EM framework, enable it in the default arm64 defconfig, which is the
> most commonly used architecture for IPA. This will also compile-in all
> of the EAS code, although it won't be enabled by default -- EAS requires
> to use the 'schedutil' CPUFreq governor while arm64 defaults to
> 'performance'.
> 
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Quentin Perret <quentin.perret@....com>

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

> ---
>  arch/arm64/configs/defconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index 2d9c39033c1a..4881a752ab3f 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -97,6 +97,7 @@ CONFIG_XEN=y
>  CONFIG_COMPAT=y
>  CONFIG_HIBERNATION=y
>  CONFIG_WQ_POWER_EFFICIENT_DEFAULT=y
> +CONFIG_ENERGY_MODEL=y
>  CONFIG_ARM_CPUIDLE=y
>  CONFIG_CPU_FREQ=y
>  CONFIG_CPU_FREQ_STAT=y
> 


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