I don't think we should call procline from within the reserver as qless itself sets the procline based on the reserver description (plus it seems wrong to be modifying OS state when its not the top level gem providing the executable).  Was there some reason you needed to do this instead of relying on qless?
https://github.com/seomoz/qless/blob/master/lib/qless/worker/base.rb#L205