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lisa.energy_model: Refactor LinuxEnergyModel.from_target

Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_home_pr74 into master

  • Refactor from_target() to expose better the layout of the structure, so that the origin of each piece of data is obvious.

  • Remove the reliance on debugfs perf domain folder names that can change from one kernel to another. Instead, use all the folders containing the cost, frequency and capacity files.

  • Ensure internal consistency of data by only using the strictly necessary information from sysfs (capacities) and debugfs (everything else). Specifically, do not use the CPU count from devlib since the EM from debugfs already provides the information about available CPUs.

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