Operating system

• Microkernel
• Difference between microkernel monolithic kernel
• Process Control block
• How do you unblock sockets
• What is a system call? why do we need system call?
• Memory segment when a process/program is executed
• Data Segment
• Data
• BSS
• Heap
• Stack
• Code segment
• Mapping physical memory to virtual memory
• Paging
• Process and threads
• Where to use process and thread
• Scheduling threads
• Mutex
• Semaphore
• IPC
• Pipe
• Message queus
• Shared memory
• Signals
• Message queues
• Process Daemon
• Fork 

Reference:

http://lwn.net/Articles/250967/
http://www.cs.umd.edu/class/spring2003/cmsc311/Notes/index.html
Cache - http://ecee.colorado.edu/~ecen2120/Manual/caches/cache.html