Overlays in Operating systems
The entire program and data of a process must be in the physical
memory for the process to execute. The size of a process is limited to the size
of physical memory.
If a process is larger than the
amount of memory, a technique called overlays can be used. Overlays is to keep
in memory only those instructions and data that are needed at any given time.
When other instructions are needed, they are loaded into space that was
occupied previously by instructions that are no longer needed.
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