红帽全球峰会第 11 章 使用 perf top 实时分析 CPU 使用情况
您可以使用 perf top 命令实时测量不同函数的 CPU 使用情况。
11.1. perf top 的目的
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perf top 命令执行实时系统分析，以及类似于 top 实用程序的功能。虽然 top 监控进程 CPU 使用量，perf top 则按特定功能显示 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 之间所使用的函数。要使用 perf top，您需要 root 访问权限。
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