For each running process, the mapping between virtual and physical address is maintained in a data structure called the page table.
对于每个正在运行的进程，虚拟地址与物理地址之间的映射是在一个称作页表的数据结构中维护的。
However, before they can be swapped out, every single process mapping that page must be found so that the page-table entry for the page in that process can be updated.
不过，在它们可以被交换出去之前，必须找到映射那个页的每一个进程，这样那些进程中相应页的页表条目才可以被更新。
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