Operating Systems - TLB - Translation Lookaside Buffer & Effective Access Time
A CPU accesses a virtual address and the TLB results in a hit. Which sequence of events correctly describes what happens next?
A CPU accesses a virtual address and the TLB results in a hit. Which sequence of events correctly describes what happens next?
easy🧠🧾 Concept Trace Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand TLB hit
A TLB hit means the translation is found in the TLB cache.Step 2: Follow the correct sequence
A: Incorrect -- TLB entry is not invalidated on a hit.
B: Incorrect -- page table is not checked on a TLB hit.
C: Incorrect -- page fault occurs only on invalid or missing pages.
D: Correct -- physical address is retrieved from the TLB and memory is accessed directly without consulting the page table.Final Answer:
Option B -> Option BQuick Check:
TLB hit bypasses page table walk [OK]
Quick Trick: TLB hit means direct physical address access [OK]
Common Mistakes:
MISTAKES- Thinking page table is always checked
- Confusing TLB hit with page fault
- Assuming TLB entry invalidation on hit
Trap Explanation:
PITFALL- Candidates often incorrectly believe page table is consulted on every access.
Interviewer Note:
CONTEXT- Checks understanding of TLB hit behavior and memory access flow.
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