Operating Systems - TLB - Translation Lookaside Buffer & Effective Access Time
In a system where the page table walk time is optimized to be very fast, what is the most significant reason to still maintain a TLB?
In a system where the page table walk time is optimized to be very fast, what is the most significant reason to still maintain a TLB?
hard🎤 Interviewer Follow-up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand fast page table walk impact
Fast page table walks reduce miss penalty but still cost more than TLB hit.Step 2: Analyze options
A: Incorrect -- TLB does not reduce page faults; page faults depend on memory availability.
B: Correct -- TLB avoids repeated page table walks, reducing average access time.
C: Incorrect -- TLB does not affect physical memory size.
D: Incorrect -- TLB does not eliminate need for multi-level page tables; they serve different purposes.Final Answer:
Option D -> Option DQuick Check:
TLB reduces repeated page table walk overhead even if walks are fast [OK]
Quick Trick: TLB avoids repeated page table walks, not page faults [OK]
Common Mistakes:
MISTAKES- Confusing TLB role with page fault reduction
- Thinking TLB increases physical memory
- Assuming TLB replaces multi-level page tables
Trap Explanation:
PITFALL- Candidates often confuse TLB's caching role with page fault handling or memory size.
Interviewer Note:
CONTEXT- Tests deep understanding of TLB's role even when page table walks are optimized.
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