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    Subject[PATCH v5 1/3] arm64: defconfig: Enable CONFIG_ENERGY_MODEL
    Date
    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: Daniel Lezcano <daniel.lezcano@linaro.org>
    Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
    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 4d583514258c..58792e6a06da 100644
    --- a/arch/arm64/configs/defconfig
    +++ b/arch/arm64/configs/defconfig
    @@ -70,6 +70,7 @@ 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
    --
    2.21.0
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