参数设定功能，内建内存，可储存设定。
Parameter setting function, built-in memory, save and backup your setting.
现在这一类型的值可以通过内建的函数new来分配，这将返回一个指针，指向一块内存单元，其所占内存槽初始化为零。
Values of this type can now be allocated using the built-in function new, which returns a pointer to the value in memory with all slots initialized to the zero value.
另外，内核有一个内建的最终防线系统，用来在没有可用内存的时候释放内存，它会找到占用VM资源的进程并终止该进程。
In addition, the kernel has a built-in last-ditch system for freeing memory when no more is available; it'll find a process that's hogging VM resources and kill it.
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