Tagged articles

big-LITTLE

2 articles · Page 1 of 1

Aug 2, 2025 · Fundamentals

Linux Scheduler Realities: Tick Granularity, Event‑Driven Design, and Big‑Little Trade‑offs

The article examines Linux’s CFS scheduler, explaining why its 4 ms tick (250 Hz) defines task switching intervals, how event‑driven mechanisms like task wake and IRQ updates shape scheduling, and compares PELT and WALT load‑tracking methods, especially under heterogeneous big‑little CPU architectures.

CFSPELTScheduler

0 likes · 16 min read

Linux Scheduler Realities: Tick Granularity, Event‑Driven Design, and Big‑Little Trade‑offs

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