Is mindfulness itself kamma ? does it create kamma? Is mindfulness itself kamma ? does it create kamma ? is it one of the 50 types of kamma ?

(my teacher who is a monk told me mindfulness is kamma  - and like kamma its an accumulated thing )

Im asking cause if mindfulness is kamma than its accumlated - and if its accumlated it answers my "problem"  : 

Is there a value for a single moment of mindfulness (without others) ?
Fabrication (Sankhara), consists of 50 of the 52 Mental Factors (cetasika). Mindfulness appears in the 25 mental factors which arise with wholesome consciousness. Mindfulness is wholesome as it aids liberation. Unlike some factors which accumulates Fabrication which is one which aids in not creating new fabrication which keeps a being in misery. Also what every is Wholesome is not necessary accumulation of positive Karmic Fabrications. The reduction in accumulated Karma is also Wholesome are you are more closer to liberation. Also note the 50 cetasikas are not all wholesome and they influence karmic accumulation.