So, the in-memory permanent storage pages are equivalent to the file data on the disk.
因此，内存中的永久存储分页与磁盘中的文件数据完全相同。
2
When a modified permanent storage page needs to be paged out (moved from memory to disk), it is written to a file system.
当经过修改的永久存储分页需要换出(从内存移动到磁盘)的时候，会将它写入到文件系统中。
3
If the application had been doing writes to the file instead of reads, the permanent storage pages would be "modified," and AIX would have to flush the pages to disk before releasing the pages.