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Commit | Line | Data |
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fd20e811 | 1 | #include <inttypes.h> |
bc96b361 NK |
2 | #include <unistd.h> |
3 | #include <stdlib.h> | |
4 | #include <signal.h> | |
5 | #include <sys/mman.h> | |
6 | ||
7 | #include "tests.h" | |
8 | #include "util/evsel.h" | |
9 | #include "util/evlist.h" | |
10 | #include "util/cpumap.h" | |
11 | #include "util/thread_map.h" | |
12 | ||
3fe21305 | 13 | #define NR_LOOPS 10000000 |
bc96b361 NK |
14 | |
15 | /* | |
16 | * This test will open software clock events (cpu-clock, task-clock) | |
17 | * then check their frequency -> period conversion has no artifact of | |
18 | * setting period to 1 forcefully. | |
19 | */ | |
20 | static int __test__sw_clock_freq(enum perf_sw_ids clock_id) | |
21 | { | |
22 | int i, err = -1; | |
23 | volatile int tmp = 0; | |
24 | u64 total_periods = 0; | |
25 | int nr_samples = 0; | |
ba3dfff8 | 26 | char sbuf[STRERR_BUFSIZE]; |
bc96b361 NK |
27 | union perf_event *event; |
28 | struct perf_evsel *evsel; | |
29 | struct perf_evlist *evlist; | |
30 | struct perf_event_attr attr = { | |
31 | .type = PERF_TYPE_SOFTWARE, | |
32 | .config = clock_id, | |
33 | .sample_type = PERF_SAMPLE_PERIOD, | |
34 | .exclude_kernel = 1, | |
35 | .disabled = 1, | |
36 | .freq = 1, | |
37 | }; | |
c5e6bd2e AH |
38 | struct cpu_map *cpus; |
39 | struct thread_map *threads; | |
bc96b361 | 40 | |
67c1e4a5 | 41 | attr.sample_freq = 500; |
bc96b361 NK |
42 | |
43 | evlist = perf_evlist__new(); | |
44 | if (evlist == NULL) { | |
45 | pr_debug("perf_evlist__new\n"); | |
46 | return -1; | |
47 | } | |
48 | ||
ef503831 | 49 | evsel = perf_evsel__new(&attr); |
bc96b361 NK |
50 | if (evsel == NULL) { |
51 | pr_debug("perf_evsel__new\n"); | |
03ad9747 | 52 | goto out_delete_evlist; |
bc96b361 NK |
53 | } |
54 | perf_evlist__add(evlist, evsel); | |
55 | ||
c5e6bd2e AH |
56 | cpus = cpu_map__dummy_new(); |
57 | threads = thread_map__new_by_tid(getpid()); | |
58 | if (!cpus || !threads) { | |
bc96b361 NK |
59 | err = -ENOMEM; |
60 | pr_debug("Not enough memory to create thread/cpu maps\n"); | |
c5e6bd2e | 61 | goto out_free_maps; |
bc96b361 NK |
62 | } |
63 | ||
c5e6bd2e AH |
64 | perf_evlist__set_maps(evlist, cpus, threads); |
65 | ||
66 | cpus = NULL; | |
67 | threads = NULL; | |
68 | ||
d0b849e9 | 69 | if (perf_evlist__open(evlist)) { |
67c1e4a5 ACM |
70 | const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; |
71 | ||
d0b849e9 | 72 | err = -errno; |
67c1e4a5 | 73 | pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", |
c8b5f2c9 | 74 | str_error_r(errno, sbuf, sizeof(sbuf)), |
ba3dfff8 | 75 | knob, (u64)attr.sample_freq); |
03ad9747 | 76 | goto out_delete_evlist; |
d0b849e9 | 77 | } |
bc96b361 NK |
78 | |
79 | err = perf_evlist__mmap(evlist, 128, true); | |
80 | if (err < 0) { | |
81 | pr_debug("failed to mmap event: %d (%s)\n", errno, | |
c8b5f2c9 | 82 | str_error_r(errno, sbuf, sizeof(sbuf))); |
f26e1c7c | 83 | goto out_delete_evlist; |
bc96b361 NK |
84 | } |
85 | ||
86 | perf_evlist__enable(evlist); | |
87 | ||
88 | /* collect samples */ | |
89 | for (i = 0; i < NR_LOOPS; i++) | |
90 | tmp++; | |
91 | ||
92 | perf_evlist__disable(evlist); | |
93 | ||
94 | while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { | |
95 | struct perf_sample sample; | |
96 | ||
97 | if (event->header.type != PERF_RECORD_SAMPLE) | |
8e50d384 | 98 | goto next_event; |
bc96b361 NK |
99 | |
100 | err = perf_evlist__parse_sample(evlist, event, &sample); | |
101 | if (err < 0) { | |
102 | pr_debug("Error during parse sample\n"); | |
983874d1 | 103 | goto out_delete_evlist; |
bc96b361 NK |
104 | } |
105 | ||
106 | total_periods += sample.period; | |
107 | nr_samples++; | |
8e50d384 ZZ |
108 | next_event: |
109 | perf_evlist__mmap_consume(evlist, 0); | |
bc96b361 NK |
110 | } |
111 | ||
112 | if ((u64) nr_samples == total_periods) { | |
113 | pr_debug("All (%d) samples have period value of 1!\n", | |
114 | nr_samples); | |
115 | err = -1; | |
116 | } | |
117 | ||
c5e6bd2e AH |
118 | out_free_maps: |
119 | cpu_map__put(cpus); | |
120 | thread_map__put(threads); | |
03ad9747 | 121 | out_delete_evlist: |
bc96b361 NK |
122 | perf_evlist__delete(evlist); |
123 | return err; | |
124 | } | |
125 | ||
721a1f53 | 126 | int test__sw_clock_freq(int subtest __maybe_unused) |
bc96b361 NK |
127 | { |
128 | int ret; | |
129 | ||
130 | ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); | |
131 | if (!ret) | |
132 | ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); | |
133 | ||
134 | return ret; | |
135 | } |