// (trace clock units / nanoseconds) * (1e9 nanoseconds / 1 second)
	return uint64(1.0 / float64(traceTimeDiv) * 1e9)
}

// traceFrequency writes a batch with a single EvFrequency event.
//
// freq is the number of trace clock units per second.
func traceFrequency(gen uintptr) {
	w := unsafeTraceWriter(gen, nil)

	// Ensure we have a place to write to.

	}

	// Write an EvFrequency event for this generation.
	//
	// N.B. This may block for quite a while to get a good frequency estimate, so make sure we do
	// this here and not e.g. on the trace reader.
	traceFrequency(gen)

	// Collect all the untraced Gs.
	type untracedG struct {
		gp           *g
		goid         uint64
		mid          int64
		stackID      uint64
		status       uint32
		waitreason   waitReason