Which of the following best describe the idea of limited direct execution? It is the virtual address space (q.v.) which provided the operating system with the greatest facility to control processes in such a way as to grant and remove access to system resource on demand. A process must be able to use the system resources of CPU, memory and I/O without having complete control over the entire system, effectively overthrowing the operating system - all while providing a mechanism for the OS to regain control from that process and grant the same privilege to another process. An operating system must be able to grant limited time to a process at which point it removes that process from the CPU and grants time to another process. The CPU must be virtualized so that processes cannot execute privileged instructions in a non-privileged context. This is done by pretenting that those instructions do not exist in the user space and only execute NOP's.
Which of the following best describe the idea of limited direct execution?
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It is the virtual address space (q.v.) which provided the |
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A process must be able to use the system resources of CPU, memory and I/O without having complete control over the entire system, effectively overthrowing the operating system - all while providing a |
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An operating system must be able to grant limited time to a process at which point it removes that process from the CPU and grants time to another process. |
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The CPU must be virtualized so that processes cannot execute privileged instructions in a non-privileged context. This is done by pretenting that those instructions do not exist in the user space and only execute NOP's. |
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