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>
18 #include <perf/mmap.h>
20 #define NR_LOOPS 10000000
23 * This test will open software clock events (cpu-clock, task-clock)
24 * then check their frequency -> period conversion has no artifact of
25 * setting period to 1 forcefully.
27 static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
31 u64 total_periods = 0;
33 char sbuf[STRERR_BUFSIZE];
34 union perf_event *event;
36 struct evlist *evlist;
37 struct perf_event_attr attr = {
38 .type = PERF_TYPE_SOFTWARE,
40 .sample_type = PERF_SAMPLE_PERIOD,
45 struct perf_cpu_map *cpus;
46 struct perf_thread_map *threads;
49 attr.sample_freq = 500;
51 evlist = evlist__new();
53 pr_debug("evlist__new\n");
57 evsel = evsel__new(&attr);
59 pr_debug("evsel__new\n");
60 goto out_delete_evlist;
62 evlist__add(evlist, evsel);
64 cpus = perf_cpu_map__dummy_new();
65 threads = thread_map__new_by_tid(getpid());
66 if (!cpus || !threads) {
68 pr_debug("Not enough memory to create thread/cpu maps\n");
72 perf_evlist__set_maps(&evlist->core, cpus, threads);
77 if (evlist__open(evlist)) {
78 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
81 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
82 str_error_r(errno, sbuf, sizeof(sbuf)),
83 knob, (u64)attr.sample_freq);
84 goto out_delete_evlist;
87 err = evlist__mmap(evlist, 128);
89 pr_debug("failed to mmap event: %d (%s)\n", errno,
90 str_error_r(errno, sbuf, sizeof(sbuf)));
91 goto out_delete_evlist;
94 evlist__enable(evlist);
97 for (i = 0; i < NR_LOOPS; i++)
100 evlist__disable(evlist);
102 md = &evlist->mmap[0];
103 if (perf_mmap__read_init(&md->core) < 0)
106 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
107 struct perf_sample sample;
109 if (event->header.type != PERF_RECORD_SAMPLE)
112 err = perf_evlist__parse_sample(evlist, event, &sample);
114 pr_debug("Error during parse sample\n");
115 goto out_delete_evlist;
118 total_periods += sample.period;
121 perf_mmap__consume(&md->core);
123 perf_mmap__read_done(&md->core);
126 if ((u64) nr_samples == total_periods) {
127 pr_debug("All (%d) samples have period value of 1!\n",
133 perf_cpu_map__put(cpus);
134 perf_thread_map__put(threads);
136 evlist__delete(evlist);
140 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused)
144 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
146 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);