From Arm Developer:
"Energy Aware Scheduling (EAS) is an enhancement to Linux power management, unifying CPU power control under the Linux kernel. EAS extends the Linux kernel scheduler to make it fully aware of the power/performance capabilities of the CPUs in the system, to optimize energy consumption for advanced multi-core SoCs including big.LITTLE. With EAS, the Linux kernel will use the task load and a CPU ‘Energy Model’ to control task placement to select the optimal CPU to run on.
Arm, Linaro and key partners are contributing jointly to the development of EAS."
The Energy Aware Scheduling patch set is available for some platforms as part of the Linux kernels shipped with the Arm Reference Platforms deliverables.
Alternatively, see this post on the mailing list.