【cpufreq】arm架构计算计算每个频点的使用率

最新推荐文章于 2023-05-22 18:10:14 发布

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最新推荐文章于 2023-05-22 18:10:14 发布 · 983 阅读

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CC 4.0 BY-SA版权

本文主要介绍如何参照Linux内核文档计算arm架构中每个CPU频率点的使用率。通过分析time_in_state文件的前后变化，计算每个频点在p_state和c_state状态的时间占比，进而得出使用率。

主要参考这篇内核文档：https://www.kernel.org/doc/Documentation/cpu-freq/cpufreq-stats.txt

     CPU frequency and voltage scaling statistics in the Linux(TM) kernel


             L i n u x    c p u f r e q - s t a t s   d r i v e r

                       - information for users -


             Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>

Contents
1. Introduction
2. Statistics Provided (with example)
3. Configuring cpufreq-stats


1. Introduction

cpufreq-stats is a driver that provides CPU frequency statistics for each CPU.
These statistics are provided in /sysfs as a bunch of read_only interfaces. This
interface (when configured) will appear in a separate directory under cpufreq
in /sysfs (<sysfs root>/devices/system/cpu/cpuX/cpufreq/stats/) for each CPU.
Various statistics will form read_only files under this directory.

This driver is designed to be independent of any particular cpufreq_driver
that may be running on your C