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Which facility dynamically adds probes to a running system, both in user processes and in the kernel?

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Which facility dynamically adds probes to a running system, both in user processes and in the kernel?

(a) DTrace

(b) DLocate

(c) DMap

(d) DAdd

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I would like to ask this question from Basics topic in portion Processes of Operating System

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Correct choice is (a) DTrace

Easy explanation - A facility that dynamically adds probes to a running system, both in user process and in the kernel is called DTrace. This is very much useful in troubleshooting kernels in real-time.

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