99f3cc6e05
The Energy Aware Scheduler (EAS) used to rely on statically defined Energy Models (EMs) in the device tree. Now that EAS uses the EM framework, the old-style EMs are not usable by default. To address this issue, introduce a driver able to read DT-based EMs and to load them in the EM framework, hence making them available to EAS. Since EAS now uses only the active costs of CPUs, the idle cost and cluster cost of the old EM are ignored. The driver can be compiled in using the CONFIG_LEGACY_ENERGY_MODEL_DT Kconfig option (off by default). The implementation of the driver is highly inspired by the EM loading code from android-4.14 and before (written by Robin Randhawa <robin.randhawa@arm.com>), and the arch_topology driver (Juri Lelli <juri.lelli@redhat.com>). Signed-off-by: Quentin Perret <quentin.perret@arm.com> Change-Id: I4f525dfb45113ba63f01aaf8e1e809ae6b34dd52
16 lines
598 B
Text
16 lines
598 B
Text
config LEGACY_ENERGY_MODEL_DT
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bool "Legacy DT-based Energy Model of CPUs"
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default n
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help
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The Energy Aware Scheduler (EAS) used to rely on Energy Models
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(EMs) statically defined in the Device Tree. More recent
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versions of EAS now rely on the EM framework to get the power
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costs of CPUs.
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This driver reads old-style static EMs in DT and feeds them in
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the EM framework, hence enabling to use EAS on platforms with
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old DT files. Since EAS now uses only the active costs of CPUs,
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the cluster-related costs and idle-costs of the old EM are
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ignored.
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If in doubt, say N.
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