Main hypervisor
Kernel Same-page Merging (KSM)
https://www.kernel.org/doc/Documentation/vm/ksm.txt
apt install ksmtuned
hv:~# cat /sys/kernel/mm/ksm/max_page_sharing 256 hv:~# cat /sys/kernel/mm/ksm/pages_shared 57 hv:~# cat /sys/kernel/mm/ksm/pages_sharing 3289
libguestfs
apt install libguestfs-tools