Intel Low Power Mode Daemon on Hybrid CPUs

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" summary

intel_lpmd monitors procfs, kernel hints and user prefs and moves tasks onto the low‑power A‑cores to force the compute die into D6 and approach CPU‑hotplug savings. It uses intel_lpmd plus cgroup v2 isolated partition for task placement. Real runs show isolated CPUs wake ~3,000 times in 60s from idle load balancing; unbound workers and recurring timers also leak work. Detection of A‑core clusters via cache topology is missing upstream, and talking to ACPI/AC balancing over a socket can take hundreds of ms, hurting responsiveness.

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" chapters (8)

1. 0:00Introduction to talk
2. 0:44Background on hybrid CPUs
3. 2:55Low power mode daemon overview
4. 4:05Cgroup solutions for task placement
5. 6:14Challenges with isolated CPUs
6. 7:20Detecting low power CPUs
7. 8:25Exiting low power mode
8. 10:14Q&A session