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Module 5: Memory Management

20247m

What is virtual memory? How is it implemented? Explain TLB in virtual memory with neat diagram.

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Virtual Memory & TLB

Virtual memory illusions large logical space via paging + disk. Implemented by page table (logical page → frame) + demand paging (fault handler). TLB is associative cache of recent page translations (page → frame). On access: check TLB hit → frame directly, miss → page table then load TLB (with replacement). Diagram: CPU logical address → (page#, offset) → TLB lookup → frame + offset → physical address. Effective access ~ hit*(TLB+mem)+miss*(TLB+2*mem).

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