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。

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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.

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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In such a situation, every process mapping that same 1 GB of memory would consume its own 2 MB worth of page-table entries.

在这种情况下，每个映射到同一块1 GB内存的进程将为页表条目付出自己2 MB的代价。

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