1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/string.h>
11 #include "util/debug.h"
12 #include "util/evsel.h"
13 #include "util/evlist.h"
14 #include "util/cpumap.h"
15 #include "util/mmap.h"
16 #include "util/thread_map.h"
17 #include <perf/evlist.h>
19 #define NR_LOOPS 10000000
22 * This test will open software clock events (cpu-clock, task-clock)
23 * then check their frequency -> period conversion has no artifact of
24 * setting period to 1 forcefully.
26 static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
30 u64 total_periods = 0;
32 char sbuf[STRERR_BUFSIZE];
33 union perf_event *event;
35 struct evlist *evlist;
36 struct perf_event_attr attr = {
37 .type = PERF_TYPE_SOFTWARE,
39 .sample_type = PERF_SAMPLE_PERIOD,
44 struct perf_cpu_map *cpus;
45 struct perf_thread_map *threads;
48 attr.sample_freq = 500;
50 evlist = evlist__new();
52 pr_debug("evlist__new\n");
56 evsel = evsel__new(&attr);
58 pr_debug("perf_evsel__new\n");
59 goto out_delete_evlist;
61 evlist__add(evlist, evsel);
63 cpus = perf_cpu_map__dummy_new();
64 threads = thread_map__new_by_tid(getpid());
65 if (!cpus || !threads) {
67 pr_debug("Not enough memory to create thread/cpu maps\n");
71 perf_evlist__set_maps(&evlist->core, cpus, threads);
76 if (evlist__open(evlist)) {
77 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
80 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
81 str_error_r(errno, sbuf, sizeof(sbuf)),
82 knob, (u64)attr.sample_freq);
83 goto out_delete_evlist;
86 err = evlist__mmap(evlist, 128);
88 pr_debug("failed to mmap event: %d (%s)\n", errno,
89 str_error_r(errno, sbuf, sizeof(sbuf)));
90 goto out_delete_evlist;
93 evlist__enable(evlist);
96 for (i = 0; i < NR_LOOPS; i++)
99 evlist__disable(evlist);
101 md = &evlist->mmap[0];
102 if (perf_mmap__read_init(md) < 0)
105 while ((event = perf_mmap__read_event(md)) != NULL) {
106 struct perf_sample sample;
108 if (event->header.type != PERF_RECORD_SAMPLE)
111 err = perf_evlist__parse_sample(evlist, event, &sample);
113 pr_debug("Error during parse sample\n");
114 goto out_delete_evlist;
117 total_periods += sample.period;
120 perf_mmap__consume(md);
122 perf_mmap__read_done(md);
125 if ((u64) nr_samples == total_periods) {
126 pr_debug("All (%d) samples have period value of 1!\n",
132 perf_cpu_map__put(cpus);
133 perf_thread_map__put(threads);
135 evlist__delete(evlist);
139 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused)
143 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
145 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);