Q: Swap space not being used effectively I am using Parabola Linux (variant of Arch) on a Macbook Pro laptop. I have 8 GB of RAM and 8 GB of swap space set up. As far as I can see, the swap space is enabled and working; however, it seems it is barely being used, even when the physical RAM is heavily loaded. This can be seen in the following screenshot of the gnome system monitor:

The swap seems to be enabled; however only ~3 MB is being used, despite 5.6 GB of RAM being used. I forked this Linux system from one that I have set up on a desktop PC. There, the swap seems to get used much more effectively - it is not uncommon to see 2+ GB in use. I tend to run similar applications on both.
I am concerned that the swap not working effectively may be contributing to the system freezing up occasionally, when I have many programs running at once. I am also concerned that it may be contributing to other issues the system seems to have, such as not being able to hibernate properly (which I understand is supposed to use the swap space on disk).
Does anyone know of any reasons why the swap space might not be being effectively used? Is there anything I can try, to diagnose it? I have seen some older questions with similar issues, but didn't see any concrete answer that seems to help in my situation.
Edit: In response to a request in the comments, here is the output of free -h:
$ free -h
               total        used        free      shared  buff/cache   available
Mem:           7.5Gi       5.4Gi       184Mi        64Mi       1.9Gi       1.8Gi
Swap:          8.0Gi       3.0Mi       8.0Gi

it seems to show similar information to the system monitor. I.e. 72% of RAM is in use, but practically no swap is being used.
I have also checked the 'swappiness' parameter, which gives the following (seems fairly standard):
$ cat /proc/sys/vm/swappiness
60

