CPU isolation tuning through cpuset
summary
A runtime interface exposes the RCU callback offload mask so isolation moves from boot-only to adjustable via CPU sets; the prototype is four patches (work took about two years) that let the RCU RCU no_cb CPU mask be changed at runtime and integrates as an all‑in‑one partition option rather than many split properties. Motivation is Android power saving and small boot regressions (about 2–3% measured), with further work needed to export other masks or add kernel.isolation.rcnocb style knobs.
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chapters (9)
- 0:00Introduction to topic
- 0:33Understanding CPU isolation
- 2:11CPU masks and features
- 3:34Rationale for fine tuning
- 5:17Implementing runtime changes
- 6:55API design and debate
- 12:57Comparing interface options
- 17:06Handling timers and latency
- 19:17Conclusion and next steps
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