code: func parseMemInfo(reader io.Reader) (*MemInfo, error) {
  	meminfo := &MemInfo{}
  	scanner := bufio.NewScanner(reader)
  	for scanner.Scan() {
  		// Expected format: ["MemTotal:", "1234", "kB"]
  		parts := strings.Fields(scanner.Text())
  
  		// Sanity checks: Skip malformed entries.
  		if len(parts) < 3 || parts[2] != "kB" {
  			continue
  		}
  
  		// Convert to bytes.
  		size, err := strconv.Atoi(parts[1])
  		if err != nil {
  			continue
  		}
  		bytes := int64(size) * units.KiB
  
  		switch parts[0] {
  		case "MemTotal:":
  			meminfo.MemTotal = bytes
  		case "MemFree:":
  			meminfo.MemFree = bytes
  		case "SwapTotal:":
  			meminfo.SwapTotal = bytes
  		case "SwapFree:":
  			meminfo.SwapFree = bytes
  		}
  
  	}
  
  	// Handle errors that may have occurred during the reading of the file.
  	if err := scanner.Err(); err != nil {
  		return nil, err
  	}
  
  	return meminfo, nil
  }
docs: // parseMemInfo parses the /proc/meminfo file into
  // a MemInfo object given an io.Reader to the file.
  // Throws error if there are problems reading from the file