Increasing memory density by using ksm

With virtualization usage growing, the amount of RAM duplication in the same host across different virtual ma-chines possibly running the same software or handling the same data is growing at a fast pace too. KSM is a Linux Kernel module that allows to share equal anony-mous memory across different processes and in turn also across different KVM virtual machines. Thanks to the KVM design and the mmu notifier feature, the KVM virtual machines aren’t any different from any other pro-cess from the Linux Virtual Memory subsystem POV. And incidentally all Guest physical memory is allocated as regular Linux anonymous memory mappings. But KSM isn’t just for virtual machines. The KSM main task is to find equal pages in the system