[$] The weighted TEO cpuidle governor

Life gets complicated for the kernel when there is nothing for the systemto do. The obvious response is to put the CPU into an idle state tosave power, but which one? CPUs offer a wide range of sleep states withdifferent power-usage and latency characteristics. Picking too shallow astate will waste energy, while going too deep hurts latency and can impactthe performance of the system as a whole. The timer-events-oriented (TEO) cpuidle governoris a relatively new attempt to improve the kernel's choice of sleep states;at the 2020 Power Management and Scheduling in the Linux Kernel Summit,Pratik Sampat presented avariant of the TEO governor that tries to improve its choices further.