A generic energy model description
summary
Proposal to add a generic Linux energy model expressed in device tree: explicit per-performance-index dynamic power, static leakage, and transition energy cost plus transition latency, with optional temperature-linked values (tables or simple linear fits). Current energy model is CPU-focused and omits leakage and transitions; ACPI lacks support; some SoCs already include rich DT entries. Challenges include cross-domain dependencies (shared caches/voltage rails) and large measurement burdens versus on-board counters. Intended consumers: EAS, thermal and power capping; aim for “good enough” accuracy rather than perfection.
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chapters (7)
- 0:00Introduction to energy model
- 2:50Current energy model limitations
- 7:12Proposal for generic energy model
- 11:46Dependencies between power domains
- 16:40Discussion on data collection methods
- 20:11Balancing accuracy and practicality
- 21:58Closing remarks and Q&A
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