UNIX Programming and Technical

Q. What are the bits that support the demand paging?

A. Valid, Reference, Modify, Copy on write, Age. These bits are the part of the page table entry, which includes physical address of the page and protection bits

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UNIX Other Question

Q. What are data structures that are used for Demand Paging?

A. Kernel contains 4 data structures for Demand paging. They are,
Page table entries,
Disk block descriptors,
Page frame data table (pfdata),
Swap-use table. Q. How the Kernel handles the fork() system call in traditional Unix and in the System V Unix, while swapping?

A. Kernel in traditional Unix, makes the duplicate copy of the parent's address space and attaches it to the child's process, while swapping. Kernel in System V Unix, manipulates the region tables, page table, and pfdata table entries, by incrementing the reference count of the region table of shared regions