First I would pickup the process with the smem. For example, you could use smem -tas uss to have an overview.
-t ... shows totals
-a ... auto adjusts the column width
-s uss... sorts the result based on the uss column
To see details per process the best way is to use pmap. To get detailed information you should use -X switch. To get all information that kernel provides you can use -XX which usually is an overkill.
To get a 2 seconds refresh monitoring for a pid 3120:
watch -n 2 pmap -X 3120