Analyze all CPU instructions even for one second is very hard. Good place to start is Dtrace FBT provider - capture and analyze all called functions for one sec

Analyze all CPU instructions even for one second is very hard. Good place to start is Dtrace FBT provider - capture and analyze all called functions for one second. Perhaps it will be some useless work, which should not be done at all. But CPU time is cheap and programmer's time is expensive.