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?

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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