Think about it: A processes executable code comes from a file. You will need the size of the executable available as disk cache or the program execution will cause heavy thrashing and I/O. So some part of it is "real" memory pressure.
I also run an nfs server in the same machine, so after a period of heavy nfs use, most of the ram were eaten by the disk cache and rke2/kubernetes start having memory pressure taint. After a fresh restart with all pods running, the memory usage is below 10%, so I doubt the disk cache was full with executable files cache.
