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bc96b361 NK |
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 | */ | |
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 | continue; | |
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 | } | |
92 | ||
93 | if ((u64) nr_samples == total_periods) { | |
94 | pr_debug("All (%d) samples have period value of 1!\n", | |
95 | nr_samples); | |
96 | err = -1; | |
97 | } | |
98 | ||
99 | out_unmap_evlist: | |
100 | perf_evlist__munmap(evlist); | |
101 | out_close_evlist: | |
102 | perf_evlist__close(evlist); | |
103 | out_delete_maps: | |
104 | perf_evlist__delete_maps(evlist); | |
105 | out_free_evlist: | |
106 | perf_evlist__delete(evlist); | |
107 | return err; | |
108 | } | |
109 | ||
110 | int test__sw_clock_freq(void) | |
111 | { | |
112 | int ret; | |
113 | ||
114 | ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); | |
115 | if (!ret) | |
116 | ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); | |
117 | ||
118 | return ret; | |
119 | } |