[$] Saving frequency scaling in the data center

Frequency scaling - adjusting a CPU's operating frequency to save power when theworkload demands are low - is common practice across systems supported byLinux. It is, however, viewed with some suspicion in data-center settings, wherepower consumption is less of a concern and there is a strong emphasis ongetting the most performance out of the hardware. At the 2020 Power Management and Schedulingin the Linux Kernel summit (OSPM), Giovanni Gherdovich worried thatfrequency scaling may be about to go extinct in data centers; he made aplea for improving its behavior for such workloads while there is stilltime.