A basic question about utilization analysis


I saw a NVIDIA presentation slides: http://on-demand.gputechconf.com/gtc/2013/webinar/gtc-express-guided-analysis-nvidia-visual-profiler.pdf

For the slide of 4th page, the kernel is memory bounded, the right column shows a high utilization of device memory.

I wish to know what does the memory operation part (green) in the left column mean, what is included in this part?


Memory operations = load/store, operations assigned to the LD/ST unit.

Control flow = if/then/else, while, switch, etc.

Arithmetic = +,-,*,etc.