if err != nil {
		return Trace{}, err
	}

	if p.ticksPerSec == 0 {
		return Trace{}, errors.New("no EvFrequency event")
	}

	if events.Len() > 0 {
		// Translate cpu ticks to real time.
		minTs := events.Ptr(0).Ts
		// Use floating point to avoid integer overflows.
		freq := 1e9 / float64(p.ticksPerSec)
		for i := 0; i < events.Len(); i++ {
			ev := events.Ptr(i)