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Course Wrapup

This course explores key operating system topics such as protection mechanisms, kernel and user mode, and system calls. Participants will delve into concurrency with threads, monitors, and process scheduling. Memory management is covered, including address translation and demand paging, alongside file systems and I/O operations. The course emphasizes the role of operating systems in application isolation, interprocess communication techniques, and security policy enforcement. Future trends in operating systems will be discussed, focusing on optimizing user experience and transitioning to solid-state memory architectures.

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Course Wrapup

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Presentation Transcript

  1. Course Wrapup

  2. Major Topics • Protection • Kernel/user mode, system calls • Concurrency • Threads, monitors, deadlock, scheduling • Memory management • Address translation, demand paging • File systems • Disk, flash, file layout, transactions

  3. OS as Referee • Protection • OS isolates apps from bugs or attacks in other apps • Pipes and files for interprocess communication • CPU scheduling • OS decides which application thread is next onto the processor • Memory allocation • OS decides how many memory frames given to each app • File system • OS enforces security policy in accessing file data

  4. OS as Illusionist

  5. OS as Glue • Locks and condition variables • Not test&set instructions • Named files and directories • Not raw disk block storage • Pipes: stream interprocess communication • Not fixed size read/write calls • Memory-mapped files • Not raw disk reads/writes

  6. OS Trends and Future Directions • Optimize for the computer’s time => optimize for the user’s time • One processor => many • One computer => server clusters • Disk => solid state memory • Operating systems at user level • Browsers, databases, servers, parallel runtimes

  7. Advertisements • CSE 452: Distributed Systems • How can we build scalable systems that work even though parts of the system can fail at any time? • CSE 484: Security • How can we build systems that can withstand attack? • CSE 444: Databases • How do we build systems that can manage giant amounts of data reliably and efficiently? • CSE 461: Networks • How do we build protocols to allow reliable and efficient communication between computers?

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