我的
Linux机箱中的文件/ sys / devices / system / clocksource / clocksource0 / available_clocksource列出了以下时钟源：

tsc hpet acpi_pm

我知道tsc是Processer中的Timestamp Counter Register.
我知道hpet是高精度事件计时器.

我不知道什么是acpi_pm是什么硬件实现的？这是PIT(可编程间隔定时器)吗？

解决方法

这是ACPI电源管理定时器.

The ACPI Power Management Timer (or ACPI PMT) is yet another clock device included in almost all ACPI-based motherboards. Its clock signal has a fixed frequency of roughly 3.58 MHz. The device is actually a simple counter increased at each clock tick

(从Understanding the Linux Kernel)