162 	 * if (new per thread event by ptrace)  in test1()
187 	 * if (new per thread event by ptrace)  in test2()
216 	 * if (new per thread event by ptrace)  in test3()
217 	 *	if (existing thread event by perf on the same thread)  in test3()
241 	 * if (new per thread event by ptrace)  in test4()
242 	 *	if (existing thread event by perf on the same thread)  in test4()
271 	 * if (new per thread event by ptrace)  in test5()
272 	 *	if (existing thread event by perf on the different thread)  in test5()
309 	 * if (new per thread kernel event by perf)  in test6()
310 	 *	if (existing thread event by ptrace on the same thread)  in test6()
314 	 *	if (existing thread event by ptrace)  in test6()
347 	 * if (new per thread event by perf)  in test7()
348 	 *	if (existing thread event by ptrace on the same thread)  in test7()
372 	 * if (new per thread event by perf)  in test8()
373 	 *	if (existing thread event by ptrace on the same thread)  in test8()
402 	 * if (new per thread event by perf)  in test9()
403 	 *	if (existing thread event by ptrace on the other thread)  in test9()
438 	 *	if (existing thread event by ptrace on the same thread)  in test10()
462 	 *	if (existing thread event by ptrace on the same thread)  in test11()
489 	 * if (new per thread and per cpu event by perf)  in test12()
490 	 *	if (existing thread event by ptrace on the same thread)  in test12()
513 	 * if (new per thread and per cpu event by perf)  in test13()
514 	 *	if (existing thread event by ptrace on the same thread)  in test13()
542 	 * if (new per thread and per cpu event by perf)  in test14()
543 	 *	if (existing thread event by ptrace on the other thread)  in test14()
584 	"perf cpu event -> ptrace thread event (Overlapping)",
585 	"perf cpu event -> ptrace thread event (Non-overlapping)",
586 	"perf thread event -> ptrace same thread event (Overlapping)",
587 	"perf thread event -> ptrace same thread event (Non-overlapping)",
588 	"perf thread event -> ptrace other thread event",
589 	"ptrace thread event -> perf kernel event",
590 	"ptrace thread event -> perf same thread event (Overlapping)",
591 	"ptrace thread event -> perf same thread event (Non-overlapping)",
592 	"ptrace thread event -> perf other thread event",
593 	"ptrace thread event -> perf cpu event (Overlapping)",
594 	"ptrace thread event -> perf cpu event (Non-overlapping)",
595 	"ptrace thread event -> perf same thread & cpu event (Overlapping)",
596 	"ptrace thread event -> perf same thread & cpu event (Non-overlapping)",
597 	"ptrace thread event -> perf other thread & cpu event",