acpi_pm linux 时钟源是干什么用的，用什么硬件实现的？
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What is the acpi_pm linux clocksource used for, what hardware implements it?
提问by user460880
The file /sys/devices/system/clocksource/clocksource0/available_clocksourcein my Linux box lists the following clock sources:
/sys/devices/system/clocksource/clocksource0/available_clocksource我的 Linux 盒子中的文件列出了以下时钟源：
tsc hpet acpi_pm
I know that tscis the Timestamp Counter Register in the Processer.
I know the hpetis the High Precision event timer.
我知道这tsc是处理器中的时间戳计数器寄存器。我知道这hpet是高精度事件计时器。
I do not know what the acpi_pmis and what hardware implements it? Is this the PIT (programmable interval timer)?
我不知道它acpi_pm是什么以及实现它的硬件是什么？这是 PIT（可编程间隔计时器）吗？
采纳答案by unbeli
That's ACPI power management timer.
那是 ACPI 电源管理计时器。
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
ACPI 电源管理定时器（或 ACPI PMT）是几乎所有基于 ACPI 的主板中都包含的另一种时钟设备。其时钟信号的固定频率约为 3.58 MHz。该设备实际上是一个在每个时钟滴答增加的简单计数器
(from Understanding the Linux Kernel)
（来自了解 Linux 内核）
