memory management paper

Memory Management Requirements
William Sader
POS/355
February 11, 2014
Timothy Thacker
Memory Management Requirements
During this paper titled memory management requirements topic of discussion consist of the explanation of the five requirements of memory management.
Relocation
Relocation is processes of adjustment of program addresses to match actual physical addresses where program resides in memory when program process is executed. Reasons relocations is required because computer programmers no knowledge of other programs processes exist in resident memory upon execution of a program (Stallings, 2012). Computer programmers prefer to swap active processes to and from main memory to optimize computer processor utilization providing pool of ready program processes for execution (Stallings, 2012). When a program process is switched to disk, location hard to determine when switched back in, requiring program process placement in same location in main memory when program process first executed. Computer programmers may require relocation of process within a different area of memory. Operating systems responsible for managing, and process into main memory, and requires known location process control information of execution stack. Entry point begins with execution of program process. Branch instructions consist of address referencing instructions to execute next process. Data reference instruction contains bytes, and words of data referenced. Computer processor hardware and operating system software requires the ability to translate memory references in code of program into memory addresses reflecting current location of program in main memory.
Protection
Program processes require protection against unwanted interference by other program processes caused either accidentally or intentionally by other program processes (Stallings, 2012). Programs in other processes should not have the ability to reference to reference memory locations in process for reading, and writing programs without permission. The relocation requirements make the protection requirement more difficult because of location of program process into main memory unpredictability. Memory protection requirements conducted by the computer processor hardware not the operating system software because operating systems inability to predict memory references that program processes.
Sharing
Allowing flexibility within several processes, allowing access with same portion of main memory. Processes cooperating tasks required shared access to access to the same data structure.
Memory management required controlled access within shared areas without compromising security.
Logical Organization
Main memory within a computer system organization is usually one dimensional consist of bytes or words. Secondary memory at the physical level is organized similar to main memory. This organization resembles machine hardware, and does not respond which programs are developed.

Physical Organization

Computer memory organization is in two levels. The levels consist of main memory, and

Secondary memory. Main memory is more volatile provides fast access and more expensive

main memory does not provide log term storage. Secondary memory not as volatile also providing long term storage for data.

Reference

Stallings, W. (2012). Operating systems: Internals and design principles (7th ed.). Boston, MA:

Prentice Hall