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 1000000
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 */
__test__sw_clock_freq(enum perf_sw_ids clock_id)19 static 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 = 10000;
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, 0);
46 if (evsel == NULL) {
47 pr_debug("perf_evsel__new\n");
48 goto out_free_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_maps;
58 }
59
60 perf_evlist__open(evlist);
61
62 err = perf_evlist__mmap(evlist, 128, true);
63 if (err < 0) {
64 pr_debug("failed to mmap event: %d (%s)\n", errno,
65 strerror(errno));
66 goto out_close_evlist;
67 }
68
69 perf_evlist__enable(evlist);
70
71 /* collect samples */
72 for (i = 0; i < NR_LOOPS; i++)
73 tmp++;
74
75 perf_evlist__disable(evlist);
76
77 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
78 struct perf_sample sample;
79
80 if (event->header.type != PERF_RECORD_SAMPLE)
81 goto next_event;
82
83 err = perf_evlist__parse_sample(evlist, event, &sample);
84 if (err < 0) {
85 pr_debug("Error during parse sample\n");
86 goto out_unmap_evlist;
87 }
88
89 total_periods += sample.period;
90 nr_samples++;
91 next_event:
92 perf_evlist__mmap_consume(evlist, 0);
93 }
94
95 if ((u64) nr_samples == total_periods) {
96 pr_debug("All (%d) samples have period value of 1!\n",
97 nr_samples);
98 err = -1;
99 }
100
101 out_unmap_evlist:
102 perf_evlist__munmap(evlist);
103 out_close_evlist:
104 perf_evlist__close(evlist);
105 out_delete_maps:
106 perf_evlist__delete_maps(evlist);
107 out_free_evlist:
108 perf_evlist__delete(evlist);
109 return err;
110 }
111
test__sw_clock_freq(void)112 int test__sw_clock_freq(void)
113 {
114 int ret;
115
116 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
117 if (!ret)
118 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
119
120 return ret;
121 }
122