OS Review

1
OS Review

• What is an OS?
• What is a Process?
• What is a Memory Manager?
• What is a File System?
• What is a Multiple Processor System?

2
What is an OS?

• System Calls
• Resource Manager

3
What is a process?

• Program in execution
• Process States
• Threads
• Synchronization
• Scheduling

4
What is Memory Management?

• Multiprogramming and the need to manage memory
• MFT, MVT, security (bounds, limit)
• Virtual Memory
• Paging page tables, TLB, inverted page table
• Segmentation
• Segments are paged
• Page replacement algorithms

5
What is a File System?

• Files and Directories
• File operations, permissions, security
• File structure organization
• Allocation and De-allocation
• Linked lists, bitmaps, Inodes
• Disks, partitions, file systems
• Disk Scheduling

6
Multiple Processor Systems

• Multiprocessor
• Numa, Uma
• Multicomputers
• COWS
• Distributed systems
• Middleware, CORBA, Java RMI