powerpc/pmu/count_stcx_fail.c

29 static int do_count_loop(struct event *events, u64 instructions,
43 	event_read(&events[0]);
44 	event_read(&events[1]);
45 	event_read(&events[2]);
47 	expected = instructions + overhead + (events[2].result.value * 10);
48 	difference = events[0].result.value - expected;
49 	percentage = (double)difference / events[0].result.value * 100;
53 		event_report(&events[0]);
54 		event_report(&events[1]);
55 		event_report(&events[2]);
59 		printf("Actual   %llu\n", events[0].result.value);
63 	event_reset(&events[0]);
64 	event_reset(&events[1]);
65 	event_reset(&events[2]);
72 	if (difference / events[0].result.value)
79 static u64 determine_overhead(struct event *events)
84 	do_count_loop(events, 0, 0, false);
85 	overhead = events[0].result.value;
88 		do_count_loop(events, 0, 0, false);
89 		current = events[0].result.value;
104 	struct event events[3];
110 	setup_event(&events[0], PERF_COUNT_HW_INSTRUCTIONS, PERF_TYPE_HARDWARE, "instructions");
111 	setup_event(&events[1], PERF_COUNT_HW_CPU_CYCLES, PERF_TYPE_HARDWARE, "cycles");
112 	setup_event(&events[2], PM_STCX_FAIL, PERF_TYPE_RAW, "stcx_fail");
114 	if (event_open(&events[0])) {
119 	if (event_open_with_group(&events[1], events[0].fd)) {
124 	if (event_open_with_group(&events[2], events[0].fd)) {
129 	overhead = determine_overhead(events);
133 	FAIL_IF(do_count_loop(events, 1000000, overhead, true));
136 	FAIL_IF(do_count_loop(events, 10000000, overhead, true));
139 	FAIL_IF(do_count_loop(events, 100000000, overhead, true));
142 	FAIL_IF(do_count_loop(events, 1000000000, overhead, true));
145 	FAIL_IF(do_count_loop(events, 16000000000, overhead, true));
147 	event_close(&events[0]);
148 	event_close(&events[1]);