How Unix implements virtual memory?

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Old 09-03-2009
Computer How Unix implements virtual memory?

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1. The problem statement, all variables and given/known data:
The key to using memory most efficiently is virtual memory management. Consider both Windows and UNIX operating systems. Compare and contrast how each implements virtual memory. Describe how each one handles page faults, working sets, and page sizes, and how it reconciles thrashing issues. Cite your sources.

2. Relevant commands, code, scripts, algorithms:
there are no commands required.

3. The attempts at a solution (include all code and scripts):
no solution.

4. School (University) and Course Number:
Mapua Institute of Technology - Information Technology
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vga_copytoplanar256(3)						Svgalib User Manual					    vga_copytoplanar256(3)

vga_copytoplanar256 - copy linear pixmap into Mode X video memory SYNOPSIS
#include <vga.h> void vga_copytoplanar256(unsigned char *virtual, int pitch, int voffset, int vpitch, int w, int h); DESCRIPTION
Copy part of a linear virtual screen in system memory at *virtual to Mode X style video memory. pitch is the logical width of the virtual screen (in pixels (which are one byte large)), voffset is the address offset into video memory, vpitch is the logical scanline width of the screen. (w, h) is the width and height of the area to copy in pixels (w must be a multiple of 4). SEE ALSO
svgalib(7), vgagl(7), libvga.config(5), vga_accel(3), vga_copytoplanar16(3), vga_copytoplane(3), vga_drawscanline(3), vga_drawscanseg- ment(3), vga_getmodeinfo(3), vga_setlogicalwidth(3), vga_imageblt(3), vga_setmodeX(3), AUTHOR
This manual page was edited by Michael Weller <>. The exact source of the referenced function as well as of the original documentation is unknown. It is very likely that both are at least to some extent are due to Harm Hanemaayer <>. Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections to this first version of the svgalib manual. Svgalib (>;= 1.2.11) 27 July 1997 vga_copytoplanar256(3)