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", "getpgrp",
28 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
30 #define nsyscalls ARRAY_SIZE(syscall_names)
31 unsigned int nr_events[nsyscalls],
32 expected_nr_events[nsyscalls], i, j;
33 struct perf_evsel *evsels[nsyscalls], *evsel;
35 threads = thread_map__new(-1, getpid(), UINT_MAX);
36 if (threads == NULL) {
37 pr_debug("thread_map__new\n");
41 cpus = cpu_map__new(NULL);
43 pr_debug("cpu_map__new\n");
44 goto out_free_threads;
48 CPU_SET(cpus->map[0], &cpu_set);
49 sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
50 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
51 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
52 cpus->map[0], strerror(errno));
56 evlist = perf_evlist__new();
58 pr_debug("perf_evlist__new\n");
62 perf_evlist__set_maps(evlist, cpus, threads);
64 for (i = 0; i < nsyscalls; ++i) {
67 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
68 evsels[i] = perf_evsel__newtp("syscalls", name, i);
69 if (evsels[i] == NULL) {
70 pr_debug("perf_evsel__new\n");
74 evsels[i]->attr.wakeup_events = 1;
75 perf_evsel__set_sample_id(evsels[i], false);
77 perf_evlist__add(evlist, evsels[i]);
79 if (perf_evsel__open(evsels[i], cpus, threads) < 0) {
80 pr_debug("failed to open counter: %s, "
81 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
87 expected_nr_events[i] = 1 + rand() % 127;
90 if (perf_evlist__mmap(evlist, 128, true) < 0) {
91 pr_debug("failed to mmap events: %d (%s)\n", errno,
96 for (i = 0; i < nsyscalls; ++i)
97 for (j = 0; j < expected_nr_events[i]; ++j) {
98 int foo = syscalls[i]();
102 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
103 struct perf_sample sample;
105 if (event->header.type != PERF_RECORD_SAMPLE) {
106 pr_debug("unexpected %s event\n",
107 perf_event__name(event->header.type));
111 err = perf_evlist__parse_sample(evlist, event, &sample);
113 pr_err("Can't parse sample, err = %d\n", err);
118 evsel = perf_evlist__id2evsel(evlist, sample.id);
120 pr_debug("event with id %" PRIu64
121 " doesn't map to an evsel\n", sample.id);
124 nr_events[evsel->idx]++;
125 perf_evlist__mmap_consume(evlist, 0);
129 list_for_each_entry(evsel, &evlist->entries, node) {
130 if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
131 pr_debug("expected %d %s events, got %d\n",
132 expected_nr_events[evsel->idx],
133 perf_evsel__name(evsel), nr_events[evsel->idx]);
140 perf_evlist__munmap(evlist);
142 for (i = 0; i < nsyscalls; ++i)
143 perf_evsel__close_fd(evsels[i], 1, threads->nr);
145 perf_evlist__delete(evlist);
147 cpu_map__delete(cpus);
149 thread_map__delete(threads);