Paging provides isolated large address spaces.
Virtual memory gives each process a private address space mapped to physical frames by page tables; pages not in RAM are swapped from disk on demand (page faults). TLBs cache translations; replacement policies include LRU. Enables isolation, over-commit and memory-mapped files.
A 32-bit process sees 4 GB of virtual addresses regardless of installed RAM.
Virtual memory gives each program its own large address space and protects processes from each other, which is central to modern systems.
Paging provides isolated large address spaces.
Virtual memory gives each program its own large address space and protects processes from each other, which is central to modern systems.
Dividing memory into fixed-size pages and mapping them to physical frames, so pages can be stored on disk when not in use.
An access to a page not currently in RAM, which the operating system handles by loading the page, sometimes slowly.
Typical applications include running a program that needs more memory than physically available by paging to disk, keeping one application from reading another's memory and mapping a file into memory so it can be accessed like an array.
Study "Processes and scheduling" first (topic 59 of 104 in Software & Computing). It covers the groundwork this topic builds on.
Paging and segmentation. Thrashing. Copy-on-write.
A 32-bit process sees 4 GB of virtual addresses regardless of installed RAM.
The next topic is "File systems", which builds directly on this one.
It is classed as Intermediate in Software & Computing (topic 60 of 104). It is an intermediate topic. Work through the beginner topics in Software & Computing first.
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