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Linux scopes Intel's RAPL energy-status MSRs per die: its RAPL PMU treats the package counter as package-scope only on AMD and Hygon (rapl_pkg_pmu_is_pkg_scope(), arch/x86/events/rapl.c: "AMD/HYGON platforms have a per-PKG package energy counter", "CLX-AP is multi-die and its RAPL MSRs are die-scope"), and its powercap driver names a zone package-<p>-die-<d> where the MSRs are not package-scope and a package holds more than one die (intel_rapl_common.c). The MSR fallback grouped CPUs by physical_package_id alone, so on a multi-die Intel package it read one die and missed the rest: an under-count, the unsafe direction at a ceiling. MSR fallback: on Intel family 6 a domain is (physical_package_id, die_id), die 0 where the kernel lists no die_id; on AMD Zen and Hygon it stays the package, whatever die_id says. Each domain is read on its lowest-numbered CPU and is a package zone of its own, indexed in (package, die) order, so each die is a rail of its own in the liveness rule and every die is summed. All-or-nothing, the zero unit, the wrap and powercap preferred are as before. (MsrPackage is now MsrDomain.) Powercap: is_package_name also accepts package-<digits>-die-<digits>, and nothing looser, so a multi-die host's per-die zones are its packages: powercap lists a package (the MSRs are not read), and both die zones are summed. Before, such a host listed no package and fell to the MSRs, as root only. The RAPL hardware test's oracle follows the same rules with its own code. Tests (fake files): two Intel packages of two dies each, four domains each read on its own die's first CPU and summed; an AMD package whose CPUs carry two die_ids, one domain; an Intel host with no die_id files, per package; a two-die powercap tree summing both die zones and not psys; and the name rule (package-0-die-0 yes; package-0-die-, package-0-die, package--die-0, package-0-die-x, package-0-core-0 no). proof-cascade and proof-cli tests pass on Linux, proof-cascade on macOS (with its ioreport liveness grep); clippy is clean with -D warnings on Linux (proof-cascade, proof-cli) and macOS (proof-cascade, proof-solvers). Co-Authored-By: Claude Opus 5.5 <[email protected]> |
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