idle_page_tracking[1] is a simple, stupid toolbox for idle pages tracking. It can be used to get real working set size of a process.
Tools This section describes two tools in the box though more tools exists. You can get more description about each tool from the README in the repository[1].
userprog userprog is a sample synthetic workload for test of other tools. It interactively allocates and access specified pages in the allocated pages.