}

	filledBuf := make([]win_pdh.PDH_FMT_COUNTERVALUE_ITEM_DOUBLE, bufCount*size)
	ret = win_pdh.PdhGetFormattedCounterArrayDouble(p.counterHandle, &bufSize, &bufCount, &filledBuf[0])
	if ret != win_pdh.ERROR_SUCCESS {
		return nil, 0, fmt.Errorf("unable to collect data from counter. Error code is %x", ret)
	}

	return filledBuf, bufCount, nil

	CAvg      float64 // cumulative average
	prevSMA   float64
	filledBuf bool
}

func newSMA(ln int) *SMA {
	if ln <= 0 {
		ln = defaultWindowSize
	}
	return &SMA{
		buf:    make([]float64, ln),
		window: ln,
		idx:    0,
	}
}

func (s *SMA) addSample(next float64) {
	prev := s.buf[s.idx]
	s.buf[s.idx] = next

	if s.filledBuf {
		s.prevSMA += (next - prev) / float64(s.window)