stat and Kernel Timers

This article explains how Linux computes CPU utilization shown by the top command, detailing the role of /proc/stat, kernel_cpustat, timer interrupts, sampling intervals, and how user, nice, system, irq, softirq, iowait, and idle times are accumulated and reported.

Linuxcpu-utilizationkernel

0 likes · 16 min read

How Linux Calculates CPU Utilization for top – Inside /proc/stat and Kernel Timers

Refining Core Development Skills

Feb 22, 2023 · Fundamentals

Understanding Linux CPU Utilization Statistics and the Top Command

This article explains how Linux calculates CPU utilization shown by the top command, detailing the role of /proc/stat, kernel sampling mechanisms, and the handling of user, nice, system, IRQ, soft‑IRQ, iowait and idle times, while providing code examples and practical insights.

Linuxproc statsystem-monitoring

0 likes · 13 min read

Understanding Linux CPU Utilization Statistics and the Top Command