Operating Systems

• mémoire - matière potentielle : f addresses
• mémoire - matière potentielle : management
• mémoire - matière potentielle : page
• mémoire - matière potentielle : f header information f machine code f
• mémoire - matière potentielle : management unit
• mémoire - matière potentielle : space
• mémoire - matière potentielle : disk implementation
• mémoire - matière potentielle : f
• mémoire - matière potentielle : request
• mémoire - matière potentielle : contents
• mémoire - matière potentielle : management f
• mémoire - matière potentielle : into bocks of same size
• mémoire
• mémoire - matière potentielle : page number frame number
• mémoire - matière potentielle : from hole
• mémoire - matière potentielle : view f paging
• mémoire - matière potentielle : size 32 bytes
• mémoire - matière potentielle : accesses per data
• mémoire - matière potentielle : memory management
• mémoire - matière potentielle : management outline f
• mémoire - matière potentielle : locations
• mémoire - matière potentielle : allocation
• mémoire - matière potentielle : segments
• mémoire - matière potentielle : units

1Operating Systems Memory Management (Ch 8.1 - 8.6) Overview F Provide Services (done) – processes (done) – files (done in cs4513) F Manage Devices – processor (done) – memory (next!) – disk Simple Memory Management F One process in memory, using it all – each program needs I/O drivers – until 1960 RAM User Prog I/O drivers Simple Memory Management F Small, protected OS, drivers – DOS OS OS RAM ROM DeviceDrivers ROM OS RAM RAM User Prog User Prog User Prog F “Mono-programming” -- No multiprocessing! F Early efforts used “Swapping”,

• load time
• ram rom devicedrivers rom
• unreliable signals
• frame cpu
• systems software signals software
• physical memory
• page table
• page
• time