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1// SPDX-License-Identifier: GPL-2.0
2#include <errno.h>
3#include <inttypes.h>
4#include <unistd.h>
5#include <stdlib.h>
6#include <signal.h>
7#include <sys/mman.h>
8#include <linux/string.h>
9
10#include "tests.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
19#define NR_LOOPS 10000000
20
21/*
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.
25 */
26static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
27{
28 int i, err = -1;
29 volatile int tmp = 0;
30 u64 total_periods = 0;
31 int nr_samples = 0;
32 char sbuf[STRERR_BUFSIZE];
33 union perf_event *event;
34 struct evsel *evsel;
35 struct evlist *evlist;
36 struct perf_event_attr attr = {
37 .type = PERF_TYPE_SOFTWARE,
38 .config = clock_id,
39 .sample_type = PERF_SAMPLE_PERIOD,
40 .exclude_kernel = 1,
41 .disabled = 1,
42 .freq = 1,
43 };
44 struct perf_cpu_map *cpus;
45 struct perf_thread_map *threads;
46 struct mmap *md;
47
48 attr.sample_freq = 500;
49
50 evlist = evlist__new();
51 if (evlist == NULL) {
52 pr_debug("evlist__new\n");
53 return -1;
54 }
55
56 evsel = evsel__new(&attr);
57 if (evsel == NULL) {
58 pr_debug("perf_evsel__new\n");
59 goto out_delete_evlist;
60 }
61 evlist__add(evlist, evsel);
62
63 cpus = perf_cpu_map__dummy_new();
64 threads = thread_map__new_by_tid(getpid());
65 if (!cpus || !threads) {
66 err = -ENOMEM;
67 pr_debug("Not enough memory to create thread/cpu maps\n");
68 goto out_free_maps;
69 }
70
71 perf_evlist__set_maps(&evlist->core, cpus, threads);
72
73 cpus = NULL;
74 threads = NULL;
75
76 if (evlist__open(evlist)) {
77 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
78
79 err = -errno;
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;
84 }
85
86 err = evlist__mmap(evlist, 128);
87 if (err < 0) {
88 pr_debug("failed to mmap event: %d (%s)\n", errno,
89 str_error_r(errno, sbuf, sizeof(sbuf)));
90 goto out_delete_evlist;
91 }
92
93 evlist__enable(evlist);
94
95 /* collect samples */
96 for (i = 0; i < NR_LOOPS; i++)
97 tmp++;
98
99 evlist__disable(evlist);
100
101 md = &evlist->mmap[0];
102 if (perf_mmap__read_init(md) < 0)
103 goto out_init;
104
105 while ((event = perf_mmap__read_event(md)) != NULL) {
106 struct perf_sample sample;
107
108 if (event->header.type != PERF_RECORD_SAMPLE)
109 goto next_event;
110
111 err = perf_evlist__parse_sample(evlist, event, &sample);
112 if (err < 0) {
113 pr_debug("Error during parse sample\n");
114 goto out_delete_evlist;
115 }
116
117 total_periods += sample.period;
118 nr_samples++;
119next_event:
120 perf_mmap__consume(md);
121 }
122 perf_mmap__read_done(md);
123
124out_init:
125 if ((u64) nr_samples == total_periods) {
126 pr_debug("All (%d) samples have period value of 1!\n",
127 nr_samples);
128 err = -1;
129 }
130
131out_free_maps:
132 perf_cpu_map__put(cpus);
133 perf_thread_map__put(threads);
134out_delete_evlist:
135 evlist__delete(evlist);
136 return err;
137}
138
139int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused)
140{
141 int ret;
142
143 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
144 if (!ret)
145 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
146
147 return ret;
148}
1#include <unistd.h>
2#include <stdlib.h>
3#include <signal.h>
4#include <sys/mman.h>
5
6#include "tests.h"
7#include "util/evsel.h"
8#include "util/evlist.h"
9#include "util/cpumap.h"
10#include "util/thread_map.h"
11
12#define NR_LOOPS 10000000
13
14/*
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.
18 */
19static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
20{
21 int i, err = -1;
22 volatile int tmp = 0;
23 u64 total_periods = 0;
24 int nr_samples = 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,
30 .config = clock_id,
31 .sample_type = PERF_SAMPLE_PERIOD,
32 .exclude_kernel = 1,
33 .disabled = 1,
34 .freq = 1,
35 };
36
37 attr.sample_freq = 500;
38
39 evlist = perf_evlist__new();
40 if (evlist == NULL) {
41 pr_debug("perf_evlist__new\n");
42 return -1;
43 }
44
45 evsel = perf_evsel__new(&attr);
46 if (evsel == NULL) {
47 pr_debug("perf_evsel__new\n");
48 goto out_delete_evlist;
49 }
50 perf_evlist__add(evlist, evsel);
51
52 evlist->cpus = cpu_map__dummy_new();
53 evlist->threads = thread_map__new_by_tid(getpid());
54 if (!evlist->cpus || !evlist->threads) {
55 err = -ENOMEM;
56 pr_debug("Not enough memory to create thread/cpu maps\n");
57 goto out_delete_evlist;
58 }
59
60 if (perf_evlist__open(evlist)) {
61 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
62
63 err = -errno;
64 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
65 strerror(errno), knob, (u64)attr.sample_freq);
66 goto out_delete_evlist;
67 }
68
69 err = perf_evlist__mmap(evlist, 128, true);
70 if (err < 0) {
71 pr_debug("failed to mmap event: %d (%s)\n", errno,
72 strerror(errno));
73 goto out_delete_evlist;
74 }
75
76 perf_evlist__enable(evlist);
77
78 /* collect samples */
79 for (i = 0; i < NR_LOOPS; i++)
80 tmp++;
81
82 perf_evlist__disable(evlist);
83
84 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
85 struct perf_sample sample;
86
87 if (event->header.type != PERF_RECORD_SAMPLE)
88 goto next_event;
89
90 err = perf_evlist__parse_sample(evlist, event, &sample);
91 if (err < 0) {
92 pr_debug("Error during parse sample\n");
93 goto out_delete_evlist;
94 }
95
96 total_periods += sample.period;
97 nr_samples++;
98next_event:
99 perf_evlist__mmap_consume(evlist, 0);
100 }
101
102 if ((u64) nr_samples == total_periods) {
103 pr_debug("All (%d) samples have period value of 1!\n",
104 nr_samples);
105 err = -1;
106 }
107
108out_delete_evlist:
109 perf_evlist__delete(evlist);
110 return err;
111}
112
113int test__sw_clock_freq(void)
114{
115 int ret;
116
117 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
118 if (!ret)
119 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
120
121 return ret;
122}