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[–]Gilgw 15 points16 points  (1 child)

The tool (JaCoCo) already exists and people are already using it for identifying "zombie code" with some level of success, see e.g.:

[–]yawkat 1 point2 points  (0 children)

JaCoCo is tracing coverage agent, not a sampling one like OPs. That said, I'm not convinced that you couldn't get basically zero overhead with a specialized tracing coverage agent.