jcp-energy: the RAPL probe tests advance their fake zones on the probe's own tick #272
2026-10-15
jcp-energy: the RAPL probe tests advance their fake zones on the probe's own tick
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Two tests checked the RAPL liveness probe on fake powercap trees: `the_rapl_probe_on_fake_powercap_trees` and `rapl_sums_and_probes_the_package_zones_only`. A second thread advanced the fake zones on a 2 ms timer while the probe's tick burned CPU on the calling thread. On a loaded CI host that thread was starved, the intervals went flat, and two live packages read Frozen. It failed PR #270's jcp-rs leg (job 29211: "both packages advancing, psys and dram holding, was not live"), and that PR does not touch jcp. `rapl_status_ticking` runs RAPL's probe with its real opener, sampler, CPU-burning tick, clock and budget, and adds the fake hardware's rise after each tick, on the probe's own thread. Every interval sees exactly the rise the test means, so the verdict comes from the probe's rule and not from the scheduler. `rapl_status_on`, the real composition, is still exercised by the same tests' Frozen and Unavailable cases. On the build host the two tests passed in 10 of 10 runs (Live in ~311 ms, Frozen at the 1 s budget). The full suite passes with `--features nvml`. Co-Authored-By: Claude Opus 5.5 <[email protected]>