seems like a good option if more bugs happen (inevitable)
How did they botch this? Base unpriv'd functionality should just be sampling user PC/SP at each interrupt.
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It's way more complicated than that. It's a very generic interface for handling / filtering events, etc.
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http://www.brendangregg.com/perf.html covers a bit of the functionality beyond the basics. It even has BPF integration.
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It doesn't really have a defined scope. It's the API for exposing all kinds of event monitoring features.
End of conversation
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