如果该文件不包含可执行文本，那么系统会将该文件视为非计算性的，并且将该文件中的所有永久存储分页都标记为非计算性的。
If the file does not contain executable text, the system treats the file as non-computational file and marks all of the pages in the file as non-computational.
如果一个文件包含某个进程的可执行文本，那么系统会将该文件视为计算性的，并且将该文件中的所有永久存储分页都标记为计算性的。
If a file contains executable text for a process, the system treats the file as computational and marks all of the permanent storage pages in the file as computational.
如前所述，可以直接释放没有经过修改的永久存储分页，无需将其写入到文件系统中，因为文件系统包含该数据的原始副本。
As mentioned earlier, an unmodified permanent storage page can just be released without being written to the file system, since the file system contains a pristine copy of the data.
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