Program execution tracing system improvements

摘要: A tracing program method that copies into an area within a each instruction to be executed and traced in manner which makes subservient the program. hardware counter of computer system addresses program, rather than being traced. programmed controlled by maintains address its next While traced, is effectively executing data using same sequence it would use on as if was not alone operating data. The can control entire while programs are system. wholly or partially trace sampling over cycle determined time count, overriding manual control. When tracing, go quiescence state, therein retains preparation for later but permits speedup execution instructions. requires neither machine interrupts, nor modifications code, provides form subsequently analyzed disclosed analysis so output from single run used any number times varying types analyses.