Operating Systems
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Questions and Answers

Which of the following is NOT a reason for a context switch to occur?

  • The application has been preempted
  • The context is out of memory (correct)
  • The application has yielded its time slice
  • A kernel function has been called

    • What information may be stored and retrieved during a context switch?

  • EIP and general registers
  • Segment registers and CR3
  • FPU/MMX and SSE registers
  • All of the above (correct)

    • Why can a context switch be a costly operation in an operating system?

  • It requires hardware support
  • It is time-consuming
  • It can only be done in software
  • It involves changing a large amount of data (correct)

    • How do most modern operating systems perform context switches?

    <p>A combination of hardware and software</p> Signup and view all the answers

    What is a context in a memory-protected environment?

    <p>A virtual address space</p> Signup and view all the answers

    Which of the following is NOT a reason for a context switch to occur?

    <p>The context has been saved</p> Signup and view all the answers

    What does a context switch involve?

    <p>Storing the old state and retrieving the new state</p> Signup and view all the answers

    Why do most modern operating systems perform context switches in software?

    <p>Software context switching is more portable</p> Signup and view all the answers

    What can a context switch be considered as?

    <p>A costly operation</p> Signup and view all the answers

    What information may be stored and retrieved during a context switch?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is NOT a reason for a context switch to occur?

    <p>The CPU cache needs to be flushed</p> Signup and view all the answers

    What is the purpose of a context switch?

    <p>To store and retrieve the state of a process</p> Signup and view all the answers

    Which registers may be stored and retrieved during a context switch?

    <p>All of the above</p> Signup and view all the answers

    Why can a context switch be the most costly operation in an operating system?

    <p>It involves changing a large amount of data</p> Signup and view all the answers

    How do most modern operating systems perform context switches?

    <p>Only in software</p> Signup and view all the answers

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