How to regulate High-Frequency Trading

An interesting article in Barron's highlights the problems surrounding 'High-Frequencey Trading' (HFT). Pro-Gov has for a long time called for a public discussion of this practice. Is it distorting the level-playing field to the disadvantage of ordinary investors? Somewhere the supposed profits that are generated by HFT must come from and we assume it is not just a technological zero-sum game for the market participants that engage in this practice