Reverse copy on write for better cache utilization

Methods, systems, and computer program products for providing reverse copy-on-write for improved cache utilization are disclosed. Examples generally relate to both physical and virtualized computer systems. A computer-implemented method may include detecting when a first task is to write to a memory page that is shared with a second task, creating a copy of the memory page for use by the second task, and modifying a memory mapping to associate the second task with the copy of the memory page. In a virtualized computer system, a hypervisor may detect when a first virtual machine is to write to a memory page shared with a second virtual machine, create a copy of the memory page for the second virtual machine, and adjust a memory mapping to associate the second virtual machine with the copy of the memory page.