In memory management, a dirty bit is used to indicate which of the following?
2014
In memory management, a dirty bit is used to indicate which of the following?
- A.
A page fault has occurred
- B.
A page has corrupted data
- C.
A page has been modified after being loaded into memory
- D.
An illegal access of page
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Correct answer: C
Correct answer: A page has been modified after being loaded into memory.
A dirty bit is associated with a page/frame entry. When the page is written to, the bit is set to show that the memory copy differs from the backing store copy.
During page replacement, a dirty page must be written back before it is removed. A clean page can be discarded without a write-back.
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