Paged virtual memory - computer architecture, Computer Engineering

Paged virtual memory:

Mostly all implementations of virtual memory divide the virtual address space of an application program into pages; a page is a block that contains contiguous virtual memory addresses. Pages are generally at least 4K bytes in size, and systems with big virtual address ranges or big amounts of real memory (for example: RAM) generally use larger page sizes.

Page tables

Mostly all the implementations use page tables to translate the virtual addresses of application program into physical addresses (also referred to as "real addresses") used by the hardware to process instructions. Each entry in the page table have a mapping for a virtual page to either the real memory address at which the page is stored, or an pointer that the page is presently held in a disk file. (Although most of the system does, some systems cannot support use of a disk file for virtual memory.)

Systems can have 1 page table for the overall system or a distinct page table for each application. If there is only 1, different applications which are running at the one time share a single virtual address space, for example they use different parts of a single range of VA. Systems which are use multiple page tables provide multiple virtual address spaces - concurrent applications think they are utilizing the same range of VA, but their separate page tables redirect to different real addresses.

 

 

Posted Date: 10/13/2012 5:35:10 AM | Location : United States







Related Discussions:- Paged virtual memory - computer architecture, Assignment Help, Ask Question on Paged virtual memory - computer architecture, Get Answer, Expert's Help, Paged virtual memory - computer architecture Discussions

Write discussion on Paged virtual memory - computer architecture
Your posts are moderated
Related Questions
What is managed extensibility framework? Managed extensibility framework (MEF) is a new library that is introduced as a part of .NET 4.0 and Silverlight 4. It helps in extendin

Q. Show the Features of a typical floating-point representation? The features of a typical floating-point representation of 32 bits in above figure are: Left-most bit is

Q. Explain Execution-modes of a multiprocessor? Execution-modes of a multiprocessor: Several modes of multiprocessing comprise parallel execution of programs at (i) Fine Grain

Why is Translation Look-aside Buffers (TLBs) important? The implementation of page-table is completed in the following manner: Page table is maintained in main memory.

different types of Operating System

What is priority interrupt? A priority interrupt is an interrupt that establishes a priority over the various sources to verify which condition is to be serviced first when two

Q. Show the Bus and Memory Transfers? A digital computer has many registers and rather than connecting wires amid all registers to transfer information between them a common bu

Unity / variety Unity is created by the use of elements that look like they belong together, in other words the piece will have a feeling of internal  consistency. The most

What are the advantages and disadvantages of Mealy and Moore state machine? Advantage and Disadvantage of Mealy and Moore state machine: In Mealy as the output variable is a

Expand CPI-C. CPI-C= Common Program Interface Communication.