CPU core utilization information accuracy

[eero-t]

For CPU utilization data to be meaningful, it should be accompanied by given CPU core AVG frequency for the measured load period. Real load can be represented by multiplying them together.

If frequency information is too hard to get, reporting CPU core power usage from RAPL would tell at least something about the CPU cores load.

(This is common mistake in all tools representing CPU utilization on Linux, the graph is meaningless without frequency information, or locking the frequency below turbo speeds.)