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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 | ||
3fe21305 | 12 | #define NR_LOOPS 10000000 |
bc96b361 NK |
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 | ||
67c1e4a5 | 37 | attr.sample_freq = 500; |
bc96b361 NK |
38 | |
39 | evlist = perf_evlist__new(); | |
40 | if (evlist == NULL) { | |
41 | pr_debug("perf_evlist__new\n"); | |
42 | return -1; | |
43 | } | |
44 | ||
ef503831 | 45 | evsel = perf_evsel__new(&attr); |
bc96b361 NK |
46 | if (evsel == NULL) { |
47 | pr_debug("perf_evsel__new\n"); | |
03ad9747 | 48 | goto out_delete_evlist; |
bc96b361 NK |
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"); | |
03ad9747 | 57 | goto out_delete_evlist; |
bc96b361 NK |
58 | } |
59 | ||
d0b849e9 | 60 | if (perf_evlist__open(evlist)) { |
67c1e4a5 ACM |
61 | const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; |
62 | ||
d0b849e9 | 63 | err = -errno; |
67c1e4a5 ACM |
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); | |
03ad9747 | 66 | goto out_delete_evlist; |
d0b849e9 | 67 | } |
bc96b361 NK |
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_close_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) | |
8e50d384 | 88 | goto next_event; |
bc96b361 NK |
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_unmap_evlist; | |
94 | } | |
95 | ||
96 | total_periods += sample.period; | |
97 | nr_samples++; | |
8e50d384 ZZ |
98 | next_event: |
99 | perf_evlist__mmap_consume(evlist, 0); | |
bc96b361 NK |
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 | ||
108 | out_unmap_evlist: | |
109 | perf_evlist__munmap(evlist); | |
110 | out_close_evlist: | |
111 | perf_evlist__close(evlist); | |
03ad9747 | 112 | out_delete_evlist: |
bc96b361 NK |
113 | perf_evlist__delete(evlist); |
114 | return err; | |
115 | } | |
116 | ||
117 | int test__sw_clock_freq(void) | |
118 | { | |
119 | int ret; | |
120 | ||
121 | ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); | |
122 | if (!ret) | |
123 | ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); | |
124 | ||
125 | return ret; | |
126 | } |