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
Explain POP (Post Office Protocol). The Post Office Protocol gives remote access to an electronic mail box. The protocol permits a user's mailbox to reside on a computer which

Q. Explain Shift register with diagram and waveform.   Q. Write a short note on Decoder.

What are the objectives of USB? a) Simple b) Low cost c) Easy to use d) Supports wide range of data transfer characteristics e) Plug and play mode of operation

What are various IDs associated with a process? Unix identifies each process with a unique integer known as ProcessID. The process that implements the request for creation of a

What is the Gray equivalent of  (25) 10 Ans. Gray equivalent of (25) 10 : The Decimal number 25 has binary equivalent as (00100101) 2 The left most bits (MSB) into gray

Data Validation condition: The following condition stated below must be met for a data to be valid as is shown in the figure 3a below. 1. The data on the SDA line must remain stabl

How do you calculate the complexity of sorting algorithms? Find the complexity of Insertion sort and Bubble Sort.                 The difficulty of sorting algorithms depends o

In digital ICs, Schottky transistors are preferred over normal transistors because of their ? Ans. Lower  propagation  delay  in digital ICs, as  shottky  transistors  reduce

Consider the hardware design as shown. Within the target system the EPROM would contain the hex data as shown below   Address  Assembly code   8000             86   8001

Synchronized with a clock signal Memory system considerations Speed Cost Size of chip Power dissipation Memory controller Refresh Overhead