Re: [PATCH 1/3] arm64: defconfig: Enable CONFIG_ENERGY_MODEL

Quentin Perret
2019-03-28T10:22:08Z

On Thursday 28 Mar 2019 at 10:13:50 (+0000), 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'.
>
> Signed-off-by: Quentin Perret <quentin.perret@arm.com>
> ---
> arch/arm64/configs/defconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index 2d9c39033c1a..3c09bdaaefd3 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=n

Hmm, sorry I turned this to '=n' for testing and forgot to update the
patch. This obviously should be '=y' ...

> CONFIG_ARM_CPUIDLE=y
> CONFIG_CPU_FREQ=y
> CONFIG_CPU_FREQ_STAT=y
> --
> 2.21.0
>