Commit | Line | Data |
---|---|---|
a65b9c62 JO |
1 | #include "evlist.h" |
2 | #include "evsel.h" | |
3 | #include "thread_map.h" | |
4 | #include "cpumap.h" | |
5 | #include "tests.h" | |
6 | ||
7 | /* | |
8 | * This test will generate random numbers of calls to some getpid syscalls, | |
9 | * then establish an mmap for a group of events that are created to monitor | |
10 | * the syscalls. | |
11 | * | |
12 | * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated | |
13 | * sample.id field to map back to its respective perf_evsel instance. | |
14 | * | |
15 | * Then it checks if the number of syscalls reported as perf events by | |
16 | * the kernel corresponds to the number of syscalls made. | |
17 | */ | |
18 | int test__basic_mmap(void) | |
19 | { | |
20 | int err = -1; | |
21 | union perf_event *event; | |
22 | struct thread_map *threads; | |
23 | struct cpu_map *cpus; | |
24 | struct perf_evlist *evlist; | |
a65b9c62 | 25 | cpu_set_t cpu_set; |
cec83938 RV |
26 | const char *syscall_names[] = { "getsid", "getppid", "getpgid", }; |
27 | pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid }; | |
a65b9c62 | 28 | #define nsyscalls ARRAY_SIZE(syscall_names) |
a65b9c62 JO |
29 | unsigned int nr_events[nsyscalls], |
30 | expected_nr_events[nsyscalls], i, j; | |
31 | struct perf_evsel *evsels[nsyscalls], *evsel; | |
ba3dfff8 | 32 | char sbuf[STRERR_BUFSIZE]; |
a65b9c62 | 33 | |
a65b9c62 JO |
34 | threads = thread_map__new(-1, getpid(), UINT_MAX); |
35 | if (threads == NULL) { | |
36 | pr_debug("thread_map__new\n"); | |
37 | return -1; | |
38 | } | |
39 | ||
40 | cpus = cpu_map__new(NULL); | |
41 | if (cpus == NULL) { | |
42 | pr_debug("cpu_map__new\n"); | |
43 | goto out_free_threads; | |
44 | } | |
45 | ||
46 | CPU_ZERO(&cpu_set); | |
47 | CPU_SET(cpus->map[0], &cpu_set); | |
48 | sched_setaffinity(0, sizeof(cpu_set), &cpu_set); | |
49 | if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { | |
50 | pr_debug("sched_setaffinity() failed on CPU %d: %s ", | |
ba3dfff8 | 51 | cpus->map[0], strerror_r(errno, sbuf, sizeof(sbuf))); |
a65b9c62 JO |
52 | goto out_free_cpus; |
53 | } | |
54 | ||
334fe7a3 | 55 | evlist = perf_evlist__new(); |
a65b9c62 JO |
56 | if (evlist == NULL) { |
57 | pr_debug("perf_evlist__new\n"); | |
58 | goto out_free_cpus; | |
59 | } | |
60 | ||
334fe7a3 NK |
61 | perf_evlist__set_maps(evlist, cpus, threads); |
62 | ||
a65b9c62 | 63 | for (i = 0; i < nsyscalls; ++i) { |
a60d7953 ACM |
64 | char name[64]; |
65 | ||
66 | snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); | |
ef503831 | 67 | evsels[i] = perf_evsel__newtp("syscalls", name); |
a65b9c62 JO |
68 | if (evsels[i] == NULL) { |
69 | pr_debug("perf_evsel__new\n"); | |
f26e1c7c | 70 | goto out_delete_evlist; |
a65b9c62 JO |
71 | } |
72 | ||
a60d7953 | 73 | evsels[i]->attr.wakeup_events = 1; |
75562573 | 74 | perf_evsel__set_sample_id(evsels[i], false); |
a60d7953 | 75 | |
a65b9c62 JO |
76 | perf_evlist__add(evlist, evsels[i]); |
77 | ||
78 | if (perf_evsel__open(evsels[i], cpus, threads) < 0) { | |
79 | pr_debug("failed to open counter: %s, " | |
80 | "tweak /proc/sys/kernel/perf_event_paranoid?\n", | |
ba3dfff8 | 81 | strerror_r(errno, sbuf, sizeof(sbuf))); |
f26e1c7c | 82 | goto out_delete_evlist; |
a65b9c62 | 83 | } |
a60d7953 ACM |
84 | |
85 | nr_events[i] = 0; | |
86 | expected_nr_events[i] = 1 + rand() % 127; | |
a65b9c62 JO |
87 | } |
88 | ||
89 | if (perf_evlist__mmap(evlist, 128, true) < 0) { | |
90 | pr_debug("failed to mmap events: %d (%s)\n", errno, | |
ba3dfff8 | 91 | strerror_r(errno, sbuf, sizeof(sbuf))); |
f26e1c7c | 92 | goto out_delete_evlist; |
a65b9c62 JO |
93 | } |
94 | ||
95 | for (i = 0; i < nsyscalls; ++i) | |
96 | for (j = 0; j < expected_nr_events[i]; ++j) { | |
97 | int foo = syscalls[i](); | |
98 | ++foo; | |
99 | } | |
100 | ||
101 | while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { | |
102 | struct perf_sample sample; | |
103 | ||
104 | if (event->header.type != PERF_RECORD_SAMPLE) { | |
105 | pr_debug("unexpected %s event\n", | |
106 | perf_event__name(event->header.type)); | |
983874d1 | 107 | goto out_delete_evlist; |
a65b9c62 JO |
108 | } |
109 | ||
110 | err = perf_evlist__parse_sample(evlist, event, &sample); | |
111 | if (err) { | |
112 | pr_err("Can't parse sample, err = %d\n", err); | |
983874d1 | 113 | goto out_delete_evlist; |
a65b9c62 JO |
114 | } |
115 | ||
c5d3d50d | 116 | err = -1; |
a65b9c62 JO |
117 | evsel = perf_evlist__id2evsel(evlist, sample.id); |
118 | if (evsel == NULL) { | |
119 | pr_debug("event with id %" PRIu64 | |
120 | " doesn't map to an evsel\n", sample.id); | |
983874d1 | 121 | goto out_delete_evlist; |
a65b9c62 JO |
122 | } |
123 | nr_events[evsel->idx]++; | |
8e50d384 | 124 | perf_evlist__mmap_consume(evlist, 0); |
a65b9c62 JO |
125 | } |
126 | ||
c5d3d50d | 127 | err = 0; |
0050f7aa | 128 | evlist__for_each(evlist, evsel) { |
a65b9c62 JO |
129 | if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) { |
130 | pr_debug("expected %d %s events, got %d\n", | |
131 | expected_nr_events[evsel->idx], | |
132 | perf_evsel__name(evsel), nr_events[evsel->idx]); | |
c5d3d50d | 133 | err = -1; |
983874d1 | 134 | goto out_delete_evlist; |
a65b9c62 JO |
135 | } |
136 | } | |
137 | ||
f26e1c7c | 138 | out_delete_evlist: |
a65b9c62 | 139 | perf_evlist__delete(evlist); |
03ad9747 ACM |
140 | cpus = NULL; |
141 | threads = NULL; | |
a65b9c62 | 142 | out_free_cpus: |
f30a79b0 | 143 | cpu_map__put(cpus); |
a65b9c62 | 144 | out_free_threads: |
186fbb74 | 145 | thread_map__put(threads); |
a65b9c62 JO |
146 | return err; |
147 | } |