然后由操作系统处理，操作系统可能会寻找一块空闲内存，为它建立一个新的PTE，映射到被请求的虚拟地址。
The operating system then handles the situation, perhaps by trying to find a spare frame of ram and set up a new PTE to map it to the requested virtual address.
然后由操作系统处理，操作系统可能会寻找一块空闲内存，为它建立一个新的PTE，映射到被请求的虚拟地址。
The operating system then handles the situation, perhaps by trying to find a spare frame of ram and set up a new PTE to map it to the requested virtual address.
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