Discussion
Match the following flag bits used in the context of virtual memory management on the List I (Name of the bit) with the different purposes on the List II (Purpose) of the table mentioned :
| List I (Name of the bit) | List II (Purpose) |
|---|---|
| (i) Dirty | (a) Page initialization |
| (ii) R/W | (b) Write-back policy |
| (iii) Reference | (c) Page protection |
| (iv) Valid | (d) Page replacement policy |
Answer: D
The correct matching is (i)-(b), (ii)-(c), (iii)-(d), (iv)-(a).
- The dirty (modified) bit tells the system whether a page must be written back to disk before replacement: the write-back policy.
- The R/W bit marks a page read-only or writable: page protection.
- The reference bit records recent use, which page replacement algorithms such as clock and LRU approximations use.
- The valid bit says whether the page is in memory and properly initialised for this process: page initialization.
The other codes give the dirty bit to replacement or protection, which is not its role.
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