Interview Questions - UNIX Memory Management

1. The process's memory resident time,
2. Priority of the process and
3. The nice value.

Nice value is the value that controls {increments or decrements} the priority of the process. This value that is returned by the nice() system call. The equation for using nice value is:
Priority = ("recent CPU usage"/constant) + (base- priority) + (nice value)
Only the administrator can supply the nice value. The nice() system call works for the running process only. Nice value of one process cannot affect the nice value of the other process.

1. All processes in the main memory are asleep.
2. All "ready-to-run" processes are swapped out.
3. There is no space in the swap device for the new incoming process that are swapped out of the main memory.
4. There is no space in the main memory for the new incoming process.

1. Memory architecture must based on Pages,
2. The machine must support the 'restartable' instructions.