7 #include "util/evsel.h"
8 #include "util/evlist.h"
9 #include "util/cpumap.h"
10 #include "util/thread_map.h"
12 #define NR_LOOPS 1000000
15 * This test will open software clock events (cpu-clock, task-clock)
16 * then check their frequency -> period conversion has no artifact of
17 * setting period to 1 forcefully.
19 static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
23 u64 total_periods = 0;
25 union perf_event *event;
26 struct perf_evsel *evsel;
27 struct perf_evlist *evlist;
28 struct perf_event_attr attr = {
29 .type = PERF_TYPE_SOFTWARE,
31 .sample_type = PERF_SAMPLE_PERIOD,
37 attr.sample_freq = 10000;
39 evlist = perf_evlist__new();
41 pr_debug("perf_evlist__new\n");
45 evsel = perf_evsel__new(&attr, 0);
47 pr_debug("perf_evsel__new\n");
50 perf_evlist__add(evlist, evsel);
52 evlist->cpus = cpu_map__dummy_new();
53 evlist->threads = thread_map__new_by_tid(getpid());
54 if (!evlist->cpus || !evlist->threads) {
56 pr_debug("Not enough memory to create thread/cpu maps\n");
60 perf_evlist__open(evlist);
62 err = perf_evlist__mmap(evlist, 128, true);
64 pr_debug("failed to mmap event: %d (%s)\n", errno,
66 goto out_close_evlist;
69 perf_evlist__enable(evlist);
72 for (i = 0; i < NR_LOOPS; i++)
75 perf_evlist__disable(evlist);
77 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
78 struct perf_sample sample;
80 if (event->header.type != PERF_RECORD_SAMPLE)
83 err = perf_evlist__parse_sample(evlist, event, &sample);
85 pr_debug("Error during parse sample\n");
86 goto out_unmap_evlist;
89 total_periods += sample.period;
93 if ((u64) nr_samples == total_periods) {
94 pr_debug("All (%d) samples have period value of 1!\n",
100 perf_evlist__munmap(evlist);
102 perf_evlist__close(evlist);
104 perf_evlist__delete_maps(evlist);
106 perf_evlist__delete(evlist);
110 int test__sw_clock_freq(void)
114 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
116 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);