1 // SPDX-License-Identifier: GPL-2.0
10 #include "util/evsel.h"
11 #include "util/evlist.h"
12 #include "util/cpumap.h"
13 #include "util/thread_map.h"
15 #define NR_LOOPS 10000000
18 * This test will open software clock events (cpu-clock, task-clock)
19 * then check their frequency -> period conversion has no artifact of
20 * setting period to 1 forcefully.
22 static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
26 u64 total_periods = 0;
28 char sbuf[STRERR_BUFSIZE];
29 union perf_event *event;
30 struct perf_evsel *evsel;
31 struct perf_evlist *evlist;
32 struct perf_event_attr attr = {
33 .type = PERF_TYPE_SOFTWARE,
35 .sample_type = PERF_SAMPLE_PERIOD,
41 struct thread_map *threads;
43 attr.sample_freq = 500;
45 evlist = perf_evlist__new();
47 pr_debug("perf_evlist__new\n");
51 evsel = perf_evsel__new(&attr);
53 pr_debug("perf_evsel__new\n");
54 goto out_delete_evlist;
56 perf_evlist__add(evlist, evsel);
58 cpus = cpu_map__dummy_new();
59 threads = thread_map__new_by_tid(getpid());
60 if (!cpus || !threads) {
62 pr_debug("Not enough memory to create thread/cpu maps\n");
66 perf_evlist__set_maps(evlist, cpus, threads);
71 if (perf_evlist__open(evlist)) {
72 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
75 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
76 str_error_r(errno, sbuf, sizeof(sbuf)),
77 knob, (u64)attr.sample_freq);
78 goto out_delete_evlist;
81 err = perf_evlist__mmap(evlist, 128, true);
83 pr_debug("failed to mmap event: %d (%s)\n", errno,
84 str_error_r(errno, sbuf, sizeof(sbuf)));
85 goto out_delete_evlist;
88 perf_evlist__enable(evlist);
91 for (i = 0; i < NR_LOOPS; i++)
94 perf_evlist__disable(evlist);
96 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
97 struct perf_sample sample;
99 if (event->header.type != PERF_RECORD_SAMPLE)
102 err = perf_evlist__parse_sample(evlist, event, &sample);
104 pr_debug("Error during parse sample\n");
105 goto out_delete_evlist;
108 total_periods += sample.period;
111 perf_evlist__mmap_consume(evlist, 0);
114 if ((u64) nr_samples == total_periods) {
115 pr_debug("All (%d) samples have period value of 1!\n",
122 thread_map__put(threads);
124 perf_evlist__delete(evlist);
128 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused)
132 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
134 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);