特权指令指具有特殊权限的指令。这类指令只用于操作系统或其他系统软件，一般不直接提供给用户使用。
...system 16 16 网络与分布式系统研究室(DisNet Lab of NWU) 2011-4-1 Hardware Features • Privileged instructions（特权指令） – Certain machine level instructions can only be executed by the monitor • Interrupts – Early computer models did no...
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用户时间是指执行普通的指令所用的时间，系统时间显然是进行系统调用，特权指令所消耗的时间。
The user CPU time is the CPU time attributed to user instructions. The system CPU time is the CPU time attributed to the kernel when it executes on behalf of the process.
最后，他们使用了某一版本的BSD内核，作为进程运行在他们的微内核上层，调用Mach，而不是运行特权指令。
In the end, they had a version of the BSD kernel running as a process on top of their microkernel and calling down to Mach instead of executing privileged instructions.
类似的一个例子是完全虚拟化解决方案通过运行时代码扫描来查找和重定向特权指令(用来解决特定处理器指令集的一些问题)。
A similar example is runtime code scanning used by full virtualization solutions to find and redirect privileged instructions (to work around issues in certain processor instruction sets).
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