An easy way to find out which processes have swapped page’s is using top command.
You will see that TOP command can be used to check also other values and not only the ones you can see when simply running TOP.
Follow this steps to check which processes have swapped pages:
1. Start top using the 'top' command
2. Press the 'f' key, so you can toggle fields
3. Press 'p' to add swapped size to the top fields
4. Press [enter] to return the the normal top screen
Hope this helps!