我使用文件映射来读取一个20GB的文件。当主存储器用尽时，内核如何将文件映射的页面交换到磁盘上？
我猜可能的方式是将页面条目设置为NULL。那么下一次访问页面时，将再次调用“do_no_page（）”函数将文件映射到内存。是这样吗？
另一个问题是内核用于交换内存页面的优先级是什么？正常的页面还是映射文件的页面？
页面表中每个条目都有一个无效位。当页面交换到硬盘时，其无效位被设置。每当访问页面时，MMU（处理器内存管理单元）会引发异常，系统负责重新将页面加载到内存中。然后重新执行有故障的指令。
Usually pages that are swapped are the pages that are not frequently accessed. There is another bit in each page table entry to know whenever a page has been accessed. How to choose the right page to swap with this single bit is a big problem, there is a whole chapter about this in the very good operating systems by Andrew Tanenbaum.
你可以使用mlock()系统调用将页面锁定到RAM内存中。如果你使用mmap()在内存中映射文件，可以使用MAP_LOCKED标志来完成（参见手册）。
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