Operating System

The IBM 360 had a scheme of locking 2-KB blocks by assigning each one a 4-bit key and having the CPU compare the key on every memory reference to the 4-bit key in the PSW. Name two drawbacks of this scheme.

Virtual memory provides a mechanism for isolating one process from another. What memory management difficulties would be involved in allowing two operating systems to run concurrently? How might these difficulties be addressed?

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What is the need-to-know principle? Why is it important for a protection system to adhere to this principle?

What is the main advantage for an operating-system designer of using a virtual-machine architecture? What is the main advantage for a user?

What are the extra costs incurred by the creation and scheduling of a process, as compared to the cost of a cloned thread?

What are the advantages and disadvantages of writing an operating system in a high-level language, such as C?

Under what circumstances would a user be better off using a timesharing system rather than a PC or single-user workstation?

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