Liangxu Linux

Jul 6, 2021 · Fundamentals

How Linux Implements CPU Affinity: From sched_setaffinity to Task Migration

This article explains why binding a process to a specific CPU improves cache performance, shows how to set CPU affinity on Linux using the sched_setaffinity system call, and walks through the kernel's internal implementation—including run‑queue structures, migrate_task, and __migrate_task—illustrated with code and diagrams.