12. Hierarchical Page Tables
Hierarchical page tables are introduced as an optimal solution for page table management, helping to efficiently allocate memory for processes. The transition from single to multi-level page tables is essential for efficiently managing large addresses, particularly in 64-bit systems. Further techniques like hashed and inverted page tables are examined as advanced methods to minimize memory usage and enhance performance.
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What we have learnt
- Hierarchical page tables allow for more efficient memory allocation by reducing the overall size of page tables.
- Multi-level page tables are crucial for managing large address spaces, especially in modern computing systems.
- Hash tables and inverted page tables serve to optimize the performance of page table lookups and reduce memory overhead.
Key Concepts
- -- Hierarchical Page Tables
- A method of structuring page tables that allows the use of multiple levels to reduce memory usage.
- -- Multilevel Page Tables
- A page table organization method where the page number is split into multiple parts, each indexing different levels of page tables.
- -- Hashed Page Tables
- A technique that uses a hash function to map virtual page numbers into addresses in a page table, facilitating quicker access.
- -- Inverted Page Table
- An organization of the page table that keeps track of physical memory pages instead of logical pages, optimizing memory usage.
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