29 static int do_count_loop(struct event *events, u64 instructions,  in do_count_loop()  argument
42 	event_read(&events[0]);  in do_count_loop()
43 	event_read(&events[1]);  in do_count_loop()
46 	difference = events[0].result.value - expected;  in do_count_loop()
47 	percentage = (double)difference / events[0].result.value * 100;  in do_count_loop()
50 		event_report(&events[0]);  in do_count_loop()
51 		event_report(&events[1]);  in do_count_loop()
55 		printf("Actual   %llu\n", events[0].result.value);  in do_count_loop()
59 	event_reset(&events[0]);  in do_count_loop()
60 	event_reset(&events[1]);  in do_count_loop()
67 	if (difference / events[0].result.value)  in do_count_loop()
74 static u64 determine_overhead(struct event *events)  in determine_overhead()  argument
79 	do_count_loop(events, 0, 0, false);  in determine_overhead()
80 	overhead = events[0].result.value;  in determine_overhead()
83 		do_count_loop(events, 0, 0, false);  in determine_overhead()
84 		current = events[0].result.value;  in determine_overhead()
96 	struct event events[2];  in test_body()  local
99 	setup_event(&events[0], PERF_COUNT_HW_INSTRUCTIONS, "instructions");  in test_body()
100 	setup_event(&events[1], PERF_COUNT_HW_CPU_CYCLES, "cycles");  in test_body()
102 	if (event_open(&events[0])) {  in test_body()
107 	if (event_open_with_group(&events[1], events[0].fd)) {  in test_body()
112 	overhead = determine_overhead(events);  in test_body()
116 	FAIL_IF(do_count_loop(events, 1000000, overhead, true));  in test_body()
119 	FAIL_IF(do_count_loop(events, 10000000, overhead, true));  in test_body()
122 	FAIL_IF(do_count_loop(events, 100000000, overhead, true));  in test_body()
125 	FAIL_IF(do_count_loop(events, 1000000000, overhead, true));  in test_body()
128 	FAIL_IF(do_count_loop(events, 16000000000, overhead, true));  in test_body()
131 	FAIL_IF(do_count_loop(events, 64000000000, overhead, true));  in test_body()
133 	event_close(&events[0]);  in test_body()
134 	event_close(&events[1]);  in test_body()