Linux Kernel Journey

Sep 10, 2024 · Fundamentals

How BPF Powers the Linux sched_ext Scheduler: In‑Depth Implementation and Workflow

This article provides a comprehensive technical walkthrough of Linux's sched_ext scheduler extension, explaining how BPF enables custom scheduling policies, detailing the underlying CFS and EEVDF concepts, the new SCHED_EXT class, dispatch queues, kernel configuration, and practical code examples for building and testing BPF‑based schedulers.