如果内核编译期间设置了CONFIG_FRAME _ POINTER选项，那么就用帧指针寄存器来维护堆栈，从而就可以正确地执行堆栈回溯。
If the CONFIG_FRAME_POINTER option was set during kernel compilation, the frame pointer register is used to maintain stacks and, hence, the stack traceback can be performed correctly.
VMM还维护一个称为空闲列表的对象，该对象定义为未分配的页帧。
VMM also maintains what is referred to as a free list, which is defined as unallocated page frames.
同时，VMM维护了一个未分配页帧的空闲列表，可以使用该列表来处理缺页的问题。
At the same time, VMM maintains a free list of unallocated page frames, which are used to satisfy page faults.
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