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Linux 5.0 new feature:
https://kernelnewbies.org/Linux_5.0#Energy-aware_Scheduling_for_Arm_big.LITTLE
732cd75 sched/fair: Select an energy-efficient CPU on task wake-up
390031e4 sched/fair: Introduce an energy estimation helper function
2802bf3 sched/fair: Add over-utilization/tipping point indicator
630246a sched/fair: Clean-up update_sg_lb_stats parameters
1f74de8 sched/toplogy: Introduce the 'sched_energy_present' static key
531b5c9 sched/topology: Make Energy Aware Scheduling depend on schedutil
b68a4c0 sched/topology: Disable EAS on inappropriate platforms
011b27b sched/topology: Add lowest CPU asymmetry sched_domain level pointer
6aa140f sched/topology: Reference the Energy Model of CPUs when available
27871f7 PM: Introduce an Energy Model management framework
938e5e4 sched/cpufreq: Prepare schedutil for Energy Aware Scheduling
5bd0988 sched/topology: Relocate arch_scale_cpu_capacity() to the internal header - kernel Documents：
Documentation/power/energy-model.txt (describes the APIs of the EM framework used by EAS, and explains how new platforms can use it);
Documentation/scheduler/sched-energy.txt (details the key design points of EAS and how to enable it step by step)
- 参考资料：
EAS Linux 5.0集成简介
https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/energy-aware-scheduling-in-linux
（Energy Aware Scheduling (EAS) in Linux 5.0）
EAS Arm developer web page ：
https://developer.arm.com/tools-and-software/open-source-software/linux-kernel/energy-aware-scheduling