For each running process, the mapping between virtual and physical address is maintained in a data structure called the pagetable.
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。
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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.