.. _not_swapped:

Virtual Memory is not Process Swapping
---------------------------------------

.. index:: process swapping

Here we define something that virtual memory is **not**.  Virtual memory is
**not** process swapping.  *Process swapping* was an early attempt to use
secondary memory to supplement physical memory.  Process swapping removes
the entire memory image of a process from physical memory.

Modern operating systems use virtual memory, but not process swapping.

.. figure:: process_swap.png
   :align: center