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