[$] Frequency-invariant utilization tracking for x86
The kernel provides a number of CPU-frequency governors to choose from; by
most accounts, the most effective of those is "schedutil", which was merged for the 4.7
kernel in 2016. While schedutil is used on mobile devices, it still
doesn't see much use on x86 desktops; the intel_pstate
governor is
generally seen giving better results on those processors as a result of the
secret knowledge embodied therein. A set of patches merged for 5.7, though,
gives schedutil a better idea of what the true utilization of x86
processors is and, as a result, greatly improves its effectiveness.