Explain Implementation Issues In Operating Issue, How is the OS implemented?
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Implementation Issues
(How is the OS implemented?)
• Policy vs. Mechanism
– Policy: What do you want to do?
– Mechanism: How are you going to do it?
– Should be separated, since both change
• Algorithms used
– Linear, Tree-based, Log Structured, etc…
• Event models used
– threads vs event loops
• Backward compatability issues
– Very important for Windows 2000/XP
• System generation/configuration
– How to make generic OS fit on specific hardware
Conclusion
• Rapid Change in Hardware Leads to changing
OS
– Batch Multiprogramming Timeshare
Graphical UI Ubiquitous Devices
Cyberspace/Metaverse/??
• OS features migrated from mainframes PCs
• Policy vs Mechanism
– Crucial division: not always properly separated!
• Complexity is always out of control
– However, “Resistance is NOT Useless!”
New Structures for Multicore chips?
Tessellation: The Exploded OS
• Normal Components split into
pieces
– Device drivers
(Security/Reliability)
– Network Services
(Performance)
• TCP/IP stack
• Firewall
• Virus Checking
• Intrusion Detection
– Persistent Storage
(Performance, Security,
Reliability)
– Monitoring services
• Performance counters
• Introspection
– Identity/Environment
services (Security)
• Biometric, GPS,
Possession Tracking
• Applications Given
Larger Partitions
– Freedom to use resources
arbitrarily