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/thread_map.h"
16 #include <perf/evlist.h>
18 #define NR_LOOPS 10000000
21 * This test will open software clock events (cpu-clock, task-clock)
22 * then check their frequency -> period conversion has no artifact of
23 * setting period to 1 forcefully.
25 static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
29 u64 total_periods = 0;
31 char sbuf[STRERR_BUFSIZE];
32 union perf_event *event;
34 struct evlist *evlist;
35 struct perf_event_attr attr = {
36 .type = PERF_TYPE_SOFTWARE,
38 .sample_type = PERF_SAMPLE_PERIOD,
43 struct perf_cpu_map *cpus;
44 struct perf_thread_map *threads;
47 attr.sample_freq = 500;
49 evlist = evlist__new();
51 pr_debug("evlist__new\n");
55 evsel = evsel__new(&attr);
57 pr_debug("perf_evsel__new\n");
58 goto out_delete_evlist;
60 evlist__add(evlist, evsel);
62 cpus = perf_cpu_map__dummy_new();
63 threads = thread_map__new_by_tid(getpid());
64 if (!cpus || !threads) {
66 pr_debug("Not enough memory to create thread/cpu maps\n");
70 perf_evlist__set_maps(&evlist->core, cpus, threads);
75 if (evlist__open(evlist)) {
76 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
79 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
80 str_error_r(errno, sbuf, sizeof(sbuf)),
81 knob, (u64)attr.sample_freq);
82 goto out_delete_evlist;
85 err = perf_evlist__mmap(evlist, 128);
87 pr_debug("failed to mmap event: %d (%s)\n", errno,
88 str_error_r(errno, sbuf, sizeof(sbuf)));
89 goto out_delete_evlist;
92 evlist__enable(evlist);
95 for (i = 0; i < NR_LOOPS; i++)
98 evlist__disable(evlist);
100 md = &evlist->mmap[0];
101 if (perf_mmap__read_init(md) < 0)
104 while ((event = perf_mmap__read_event(md)) != NULL) {
105 struct perf_sample sample;
107 if (event->header.type != PERF_RECORD_SAMPLE)
110 err = perf_evlist__parse_sample(evlist, event, &sample);
112 pr_debug("Error during parse sample\n");
113 goto out_delete_evlist;
116 total_periods += sample.period;
119 perf_mmap__consume(md);
121 perf_mmap__read_done(md);
124 if ((u64) nr_samples == total_periods) {
125 pr_debug("All (%d) samples have period value of 1!\n",
131 perf_cpu_map__put(cpus);
132 perf_thread_map__put(threads);
134 evlist__delete(evlist);
138 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused)
142 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
144 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);