Paging space, or swap space, is a type of logical volume that serves as a staging area for processes that are not using active random-access memory (RAM).
分页空间（或交换空间）是一种逻辑卷，用来存储不使用随机存取存储器（RAM）进程的临时区域。
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Any access to the paging file must not generate any additional page faults.