OSC at University of Nottingham

Flashcards and summaries for OSC at the University of Nottingham

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What is involved in a context switch?

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Why are there two address spaces?

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What is the logical address space?

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What is the physical address space?

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How do address spaces work?

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What is the Memory Management Unit (MMU)?

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What is Moore's Law?

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Exemplary flashcards for OSC at the University of Nottingham on StudySmarter:

How does evolution in hardware have an implication on OS design?

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What are interrupts?

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Types of interrupts?

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Which of the following about processes is true?

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Which of the following about registers are true?

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Exemplary flashcards for OSC at the University of Nottingham on StudySmarter:

OSC

What is involved in a context switch?

Context switching must save and restore the CPU's internal state, including its registers.

OSC

Why are there two address spaces?

One cannot know where in memory an executable will run. The logical and physical address help solve this issue.

OSC

What is the logical address space?

This is what is used by the process and used by the compiler. 

OSC

What is the physical address space?

This is what is seen by the hardware. 

OSC

How do address spaces work?

The logical is translated into two different offsets. 

OSC

What is the Memory Management Unit (MMU)?

The MMU takes care of address translation i.e. adding the offset. Different processes require different address translation (offsets). Context switching requires the MMU to be updated. 

OSC

What is Moore's Law?

We hit a "power wall" which slows performance improvements of a single core/single processor systems. 

OSC

How does evolution in hardware have an implication on OS design?

Modern CPUs may have multiple cores and hyper-threaded but the XP did not support multi-processor architectures. 

OSC

What are interrupts?

Interrupts temporarily pause a process' normal operation. 

OSC

Types of interrupts?

Timer interrupts by the CPU clock

OSC

Which of the following about processes is true?

A process is a running instance of a program but a program is passive and sits on a disc.

OSC

Which of the following about registers are true?

Registers are extremely fast memory close to the CPU "core". they store data for the CPU to use.

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