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。
The page section in the output indicates current paging status of your system; pi column indicates number of pages read into the memory and po column indicates number of pages paged out of the memory.
输出的page部分指示系统的当前分页状态；pi列指示读入内存的页数目，而po 列则指示移出内存的页数目。
The page section in the output indicates current paging status of your system; pi column indicates number of pages read into the memory and po column indicates number of pages paged out of the memory.
输出的page部分指示系统的当前分页状态；pi列指示读入内存的页数目，而po 列则指示移出内存的页数目。
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