PELT | BestHub

OPPO Kernel Craftsman

May 30, 2025 · Operations

Understanding Linux CFS Scheduler: Event‑Driven Scheduling, PELT vs WALT, and Big‑LITTLE Challenges

This article explains Linux's CFS scheduler mechanics, including the impact of priority, virtual runtime, event‑driven scheduling, the differences between PELT and WALT load‑tracking algorithms, and the complexities introduced by big‑LITTLE architectures on task placement, throughput, and latency.

CFSLinuxPELT

0 likes · 14 min read

Understanding Linux CFS Scheduler: Event‑Driven Scheduling, PELT vs WALT, and Big‑LITTLE Challenges

OPPO Kernel Craftsman

Sep 4, 2020 · Fundamentals

Understanding the PELT (Per‑Entity Load Tracking) Algorithm in the Linux Kernel Scheduler

PELT (Per‑Entity Load Tracking) replaces the coarse per‑run‑queue load model in Linux’s CFS scheduler with fine‑grained, decay‑based load and utility measurements for each scheduling entity, enabling more accurate load‑balancing, CPU‑frequency decisions, and hierarchical group scheduling across heterogeneous cores.

CFSKernelLinux

0 likes · 24 min read

Understanding the PELT (Per‑Entity Load Tracking) Algorithm in the Linux Kernel Scheduler