3 #include "thread_map.h"
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
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.
15 * Then it checks if the number of syscalls reported as perf events by
16 * the kernel corresponds to the number of syscalls made.
18 int test__basic_mmap(void)
21 union perf_event *event;
22 struct thread_map *threads;
24 struct perf_evlist *evlist;
26 const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
27 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
28 #define nsyscalls ARRAY_SIZE(syscall_names)
29 unsigned int nr_events[nsyscalls],
30 expected_nr_events[nsyscalls], i, j;
31 struct perf_evsel *evsels[nsyscalls], *evsel;
32 char sbuf[STRERR_BUFSIZE];
34 threads = thread_map__new(-1, getpid(), UINT_MAX);
35 if (threads == NULL) {
36 pr_debug("thread_map__new\n");
40 cpus = cpu_map__new(NULL);
42 pr_debug("cpu_map__new\n");
43 goto out_free_threads;
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 ",
51 cpus->map[0], strerror_r(errno, sbuf, sizeof(sbuf)));
55 evlist = perf_evlist__new();
57 pr_debug("perf_evlist__new\n");
61 perf_evlist__set_maps(evlist, cpus, threads);
63 for (i = 0; i < nsyscalls; ++i) {
66 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
67 evsels[i] = perf_evsel__newtp("syscalls", name);
68 if (evsels[i] == NULL) {
69 pr_debug("perf_evsel__new\n");
70 goto out_delete_evlist;
73 evsels[i]->attr.wakeup_events = 1;
74 perf_evsel__set_sample_id(evsels[i], false);
76 perf_evlist__add(evlist, evsels[i]);
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",
81 strerror_r(errno, sbuf, sizeof(sbuf)));
82 goto out_delete_evlist;
86 expected_nr_events[i] = 1 + rand() % 127;
89 if (perf_evlist__mmap(evlist, 128, true) < 0) {
90 pr_debug("failed to mmap events: %d (%s)\n", errno,
91 strerror_r(errno, sbuf, sizeof(sbuf)));
92 goto out_delete_evlist;
95 for (i = 0; i < nsyscalls; ++i)
96 for (j = 0; j < expected_nr_events[i]; ++j) {
97 int foo = syscalls[i]();
101 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
102 struct perf_sample sample;
104 if (event->header.type != PERF_RECORD_SAMPLE) {
105 pr_debug("unexpected %s event\n",
106 perf_event__name(event->header.type));
107 goto out_delete_evlist;
110 err = perf_evlist__parse_sample(evlist, event, &sample);
112 pr_err("Can't parse sample, err = %d\n", err);
113 goto out_delete_evlist;
117 evsel = perf_evlist__id2evsel(evlist, sample.id);
119 pr_debug("event with id %" PRIu64
120 " doesn't map to an evsel\n", sample.id);
121 goto out_delete_evlist;
123 nr_events[evsel->idx]++;
124 perf_evlist__mmap_consume(evlist, 0);
128 evlist__for_each(evlist, evsel) {
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]);
134 goto out_delete_evlist;
139 perf_evlist__delete(evlist);
145 thread_map__put(threads);