Exercises

1. Alter the last probe in timer-jiffies.stp to reset the counters and continue reporting instead of exiting.

2. Write a script that, every ten seconds, displays the top five most frequent users of open system call during that interval.

3. Write a script that experimentally measures the speed of the get_cycles() counter on each processor.

4. Use any suitable probe point to get an approximate profile of process CPU usage: which processes/users use how much of each CPU.