UNIX Programming and Technical

Q. What are the phases of swapping a page from the memory?

A. Page stealer finds the page eligible for swapping and places the page number in the list of pages to be swapped.
Kernel copies the page to a swap device when necessary and clears the valid bit in the page table entry, decrements the pfdata reference count, and places the pfdata table entry at the end of the free list if its reference count is 0.

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UNIX Other Question

Q. Name two paging states for a page in memory?

A. The two paging states are:
The page is aging and is not yet eligible for swapping,
The page is eligible for swapping but not yet eligible for reassignment to other virtual address space.
Q. What is page fault? Its types?

A. Page fault refers to the situation of not having a page in the main memory when any process references it. There are two types of page fault :Validity fault, Protection fault.