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Perf buffer is still the default. In the future, we could add automatic feature detection for ring buffers and other features. In the meantime, this commits gates it behind the `--ringbuf` flag Tested with: ``` $ cargo b && sudo target/debug/rbperf record -p `pidof ruby` --ringbuf syscall enter_writev ``` and ``` $ cargo b && sudo target/debug/rbperf record -p `pidof ruby` --ringbuf syscall enter_writev ```
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