红帽全球峰会第 11 章 使用 perf top 实时分析 CPU 使用量
您可以使用 perf top 命令实时测量不同功能的 CPU 使用量。
11.1. perf top 的目的
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perf top 命令用于实时系统分析，功能类似于 top 实用程序。但是，如果 top 实用程序通常会显示给定进程或线程使用的 CPU 时间，perf top 则显示每个特定功能使用的 CPU 时间。在其默认状态下，perf top 告知您在用户空间和内核空间中的所有 CPU 之间使用的功能。要使用 perf， 您需要 root 访问权限。
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