KSM Sharing

Swap usage is not only limited to situations when there is not enough RAM available but also during normal operation. See this good blog entry: https://chrisdown.name/2018/01/02/in-defence-of-swap.html

Since you do have 1TB of RAM, you might want to not use swap at all. Those 8GB are barely a drop in the bucket. You can use swapoff -a to disable it and then comment out the line for swap in /etc/fstab to avoid it being used on the next boot.

KSM sharing will start to become active if the memory consumption of the node is over 80%. With your current usage of 80.11% you are at the threshold. If it goes higher, KSM should become active and check what memory areas of the VMs can be merged if they are the same.