Ring0

在windows自带的perfmon的add counters里面，performance选 system，下面选System up time
关于这个值：

System Up Time is the elapsed time (in seconds) that the computer has been running since it was last started. This counter displays the difference between the start time and the current time.

更简单的：

systeminfo | find /i "up time"

当然后面的 “up time”随系统语言设置变化也要变，不嫌列表太长的光输入systeminfo也行。。。难怪我开始在中文系统上怎么都找不到。。