scx_p2dq: Add energy-aware scheduling with thermal and frequency awareness #3115
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…eness Implement energy-aware scheduling (EAS) for big.LITTLE architectures. Key features: - Thermal pressure tracking infrastructure using cpu_ctx->perf field - Frequency-invariant effective capacity calculation using scx_bpf_cpuperf_cur() - Energy-aware idle CPU selection with thermal, capacity, and cost scoring - Thermal-aware CPU selection for MODE_PERF and MODE_EFFICIENCY paths - Task placement based on utilization (little cores for <25%, big cores for >75%) Implementation details: - get_effective_cpu_capacity() now scales by frequency: (base - thermal) * freq / 1024 - select_best_idle_cpu() scores CPUs: capacity * 10 - energy_cost / 10 - pick_idle_energy_aware() handles preferred/fallback core type selection - pick_idle_thermal_aware() provides lightweight thermal avoidance for mode-based scheduling Statistics added for monitoring: - P2DQ_STAT_THERMAL_KICK/AVOID: Thermal pressure events - P2DQ_STAT_EAS_LITTLE_SELECT/BIG_SELECT/FALLBACK: EAS placement decisions Enable with --enable-eas true flag. Signed-off-by: Daniel Hodges <[email protected]>
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Implement energy-aware scheduling (EAS) for big.LITTLE architectures.
Key features:
Implementation details:
Statistics added for monitoring:
Enable with --enable-eas true flag.