If the number of frames allocated to a low-priority process falls below theminimum number required by the computer architecture, we must suspendthat process’s execution. We should then page out its remaining pages, freeingall its allocated frames. This provision introduces a swap-in, swap-out level ofintermediateCPUscheduling.In fact, look at any process that does not have “enough”frames. If theprocess does not have the number of frames it needs to support pages inactive use, it will quickly page-fault. At this point, it must replace some page.However, since all its pages are in active use, it must replace a page that willbe needed again right away. Consequently, it quickly faults again, and again,and again, replacing pages that it must bring back in immediately.
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