A method of tentative tracing execution events in a multiprocessor system. Each processor stores tentative events in a corresponding buffer. The processor sets pointers in an array to a head and tail of a thread. When a condition triggers a tentative thread to be committed, the processor marks the first event as committed and sets the pointers to a null value. When a condition triggers the thread to be discarded, the processor marks the first event as discarded and sets the pointers to a null value. The processor makes the buffer available to a consumer process, which extracts the first event. If the first event is marked as committed, the consumer process follows a link to a second event of the thread and marks the second event as committed. If the first event is marked as discarded, the second event is marked as discarded and the first event is skipped.