For performance reasons or when diagnosing a problem that you suspect might be swap space related, you often need a more interactive view of the memory and paging usage.
If it doesn't, you have paging turned off and that is the problem.
如果没有，你有传呼关闭，这就是问题所在。
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There is a problem of counting the page fault rate in the paging system. This paper analyzes the cause of the difference for the output in different textbooks.