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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 char sbuf[STRERR_BUFSIZE];
26 union perf_event *event;
27 struct perf_evsel *evsel;
28 struct perf_evlist *evlist;
29 struct perf_event_attr attr = {
30 .type = PERF_TYPE_SOFTWARE,
31 .config = clock_id,
32 .sample_type = PERF_SAMPLE_PERIOD,
33 .exclude_kernel = 1,
34 .disabled = 1,
35 .freq = 1,
36 };
37 struct cpu_map *cpus;
38 struct thread_map *threads;
39
40 attr.sample_freq = 500;
41
42 evlist = perf_evlist__new();
43 if (evlist == NULL) {
44 pr_debug("perf_evlist__new\n");
45 return -1;
46 }
47
48 evsel = perf_evsel__new(&attr);
49 if (evsel == NULL) {
50 pr_debug("perf_evsel__new\n");
51 goto out_delete_evlist;
52 }
53 perf_evlist__add(evlist, evsel);
54
55 cpus = cpu_map__dummy_new();
56 threads = thread_map__new_by_tid(getpid());
57 if (!cpus || !threads) {
58 err = -ENOMEM;
59 pr_debug("Not enough memory to create thread/cpu maps\n");
60 goto out_free_maps;
61 }
62
63 perf_evlist__set_maps(evlist, cpus, threads);
64
65 cpus = NULL;
66 threads = NULL;
67
68 if (perf_evlist__open(evlist)) {
69 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
70
71 err = -errno;
72 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
73 strerror_r(errno, sbuf, sizeof(sbuf)),
74 knob, (u64)attr.sample_freq);
75 goto out_delete_evlist;
76 }
77
78 err = perf_evlist__mmap(evlist, 128, true);
79 if (err < 0) {
80 pr_debug("failed to mmap event: %d (%s)\n", errno,
81 strerror_r(errno, sbuf, sizeof(sbuf)));
82 goto out_delete_evlist;
83 }
84
85 perf_evlist__enable(evlist);
86
87 /* collect samples */
88 for (i = 0; i < NR_LOOPS; i++)
89 tmp++;
90
91 perf_evlist__disable(evlist);
92
93 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
94 struct perf_sample sample;
95
96 if (event->header.type != PERF_RECORD_SAMPLE)
97 goto next_event;
98
99 err = perf_evlist__parse_sample(evlist, event, &sample);
100 if (err < 0) {
101 pr_debug("Error during parse sample\n");
102 goto out_delete_evlist;
103 }
104
105 total_periods += sample.period;
106 nr_samples++;
107next_event:
108 perf_evlist__mmap_consume(evlist, 0);
109 }
110
111 if ((u64) nr_samples == total_periods) {
112 pr_debug("All (%d) samples have period value of 1!\n",
113 nr_samples);
114 err = -1;
115 }
116
117out_free_maps:
118 cpu_map__put(cpus);
119 thread_map__put(threads);
120out_delete_evlist:
121 perf_evlist__delete(evlist);
122 return err;
123}
124
125int test__sw_clock_freq(int subtest __maybe_unused)
126{
127 int ret;
128
129 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
130 if (!ret)
131 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
132
133 return ret;
134}
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}