Operating System QUESTION Explain the differences between user-level and kernel-level threads? How does the essential effect happen due to the difference in cost between a context switch for kernel-level threads and a switch that occurs between user-level threads?

CompTIA Linux+ Guide to Linux Certification (MindTap Course List)
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ISBN:9781305107168
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Chapter1: Introduction To Linux
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Explain the differences between user-level and kernel-level threads? How does the essential effect happen due to the difference in cost between a context switch for kernel-level threads and a switch that occurs between user-level threads? 

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