| 21. | If the page number is not in the TLB, the page table must be checked.
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| 22. | The page table translates virtual memory addresses of a process to the physical memory pages.
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| 23. | The inverted page table keeps a listing of mappings installed for all frames in physical memory.
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| 24. | The IPT combines a page table and a " frame table " into one data structure.
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| 25. | It also uses the topmost bit of the 64-bit page table entry as an NX bit.
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| 26. | The page table lookup may also fail if the page is not resident in physical memory.
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| 27. | In 1996, Liedtke completed a PhD on guarded page tables at the Technical University of Berlin.
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| 28. | An overhead of 1 KiB of memory is required for maintaining page directories and page tables.
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| 29. | It is done by keeping several page tables that cover a certain block of virtual memory.
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| 30. | Tree-based designs avoid this by placing the page table entries for adjacent pages in adjacent locations.
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