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OPPO Kernel Craftsman
OPPO Kernel Craftsman
Apr 28, 2023 · Fundamentals

Energy Aware Scheduling (EAS) in the Android Kernel: Concepts, Models, and Thread Selection

Energy Aware Scheduling (EAS) in the Android kernel uses the CPU energy model to select the most energy‑efficient CPU for each thread on heterogeneous big.LITTLE processors, considering capacity, OPP, power, and efficiency ratio; it migrates only if the migration saves more than 6% energy and overall CPU utilization stays below 80%, otherwise reverting to traditional load‑balancing.

Android KernelCPU Power ManagementPerformance Domains
0 likes · 11 min read
Energy Aware Scheduling (EAS) in the Android Kernel: Concepts, Models, and Thread Selection
OPPO Kernel Craftsman
OPPO Kernel Craftsman
Dec 17, 2021 · Fundamentals

In‑Depth Analysis of Linux CFS Task Placement and Energy Model (Part 2)

The article delves into Linux 5.10.61’s CFS task placement code, explaining the Energy‑Model framework, key data structures, and energy calculations, then walks through select_task_rq_fair’s wake‑up, fork, and exec paths, detailing EAS CPU selection, wake‑affine logic, fast and slow CPU‑selection algorithms, and how they balance performance with power on heterogeneous mobile platforms.

EASLinux kernelenergy model
0 likes · 26 min read
In‑Depth Analysis of Linux CFS Task Placement and Energy Model (Part 2)