A multilevel page table is preferred in comparison to a single level p...
The size of page table may become too big (See this) to fit in contiguous space. That is why page tables are typically divided in levels.
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A multilevel page table is preferred in comparison to a single level p...
Explanation:
A multilevel page table is preferred over a single level page table for translating virtual address to physical address due to the following reasons:
Reduced Size of Page Table:
A single level page table is not feasible for large address spaces. For example, a 32-bit address space requires a 4GB page table, which is not practical to implement as a single level page table. On the other hand, a multilevel page table divides the page table into smaller pieces, which reduces the size of the page table needed to implement the virtual address space of a process.
Reduced Memory Access Time:
In a single level page table, the entire page table must be searched for each memory access, which can be time-consuming. In contrast, a multilevel page table divides the page table into smaller pieces, which reduces the time required for memory access.
Reduction in Page Faults:
In a multilevel page table, only the needed portion of the page table is loaded into memory, which reduces the number of page faults in page replacement algorithms. This is because, in a single level page table, the entire page table must be loaded into memory, which can cause a large number of page faults.
Therefore, a multilevel page table is preferred over a single level page table for translating virtual address to physical address due to its ability to reduce the size of page table, memory access time, and page faults.
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