Virtualizing Memory
Explore how operating systems implement memory virtualization to provide each process with an isolated virtual address space. Understand how multiple running programs can use the same virtual addresses independently, while the OS manages the underlying physical memory as a shared resource. This lesson helps you grasp the fundamentals of virtual memory management and how it supports process isolation and efficient memory use.
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Now, let’s consider memory. The model of physical memory presented by modern machines is very simple. Memory is just an array of bytes; to read memory, one must specify an address to be able to access the data stored there; to write (or update) memory, one must also specify the data to be written to the given address.
Memory is accessed all the time when a program is running. A program keeps all of its data structures in memory and accesses them through various instructions, like loads and stores or other explicit instructions that access memory in doing their work. Don’t forget that each ...