US Patent 9851918 Copy-on-write by origin host in virtual machine live migration

Systems and methods for reducing network traffic in virtual machine live migration. An example method may comprise: intercepting, by a first computer system, a write access to a memory page by a virtual machine undergoing live migration from the first computer system to a second computer system; storing a copy of the memory page in a memory before allowing the virtual machine to modify the memory page; identifying data to be transmitted to the second computer system responsive to comparing the memory page and the copy of the memory page; and transmitting the data to the second computer system.