5 #include "thread_map.h"
10 int test__openat_syscall_event_on_all_cpus(void)
12 int err = -1, fd, cpu;
14 struct perf_evsel *evsel;
15 unsigned int nr_openat_calls = 111, i;
17 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
18 char sbuf[STRERR_BUFSIZE];
21 if (threads == NULL) {
22 pr_debug("thread_map__new\n");
26 cpus = cpu_map__new(NULL);
28 pr_debug("cpu_map__new\n");
29 goto out_thread_map_delete;
34 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
36 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
37 pr_debug("%s\n", errbuf);
38 goto out_thread_map_delete;
41 if (perf_evsel__open(evsel, cpus, threads) < 0) {
42 pr_debug("failed to open counter: %s, "
43 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
44 strerror_r(errno, sbuf, sizeof(sbuf)));
45 goto out_evsel_delete;
48 for (cpu = 0; cpu < cpus->nr; ++cpu) {
49 unsigned int ncalls = nr_openat_calls + cpu;
51 * XXX eventually lift this restriction in a way that
52 * keeps perf building on older glibc installations
53 * without CPU_ALLOC. 1024 cpus in 2010 still seems
54 * a reasonable upper limit tho :-)
56 if (cpus->map[cpu] >= CPU_SETSIZE) {
57 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
61 CPU_SET(cpus->map[cpu], &cpu_set);
62 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
63 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
65 strerror_r(errno, sbuf, sizeof(sbuf)));
68 for (i = 0; i < ncalls; ++i) {
69 fd = openat(0, "/etc/passwd", O_RDONLY);
72 CPU_CLR(cpus->map[cpu], &cpu_set);
76 * Here we need to explicitely preallocate the counts, as if
77 * we use the auto allocation it will allocate just for 1 cpu,
78 * as we start by cpu 0.
80 if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) {
81 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
87 for (cpu = 0; cpu < cpus->nr; ++cpu) {
88 unsigned int expected;
90 if (cpus->map[cpu] >= CPU_SETSIZE)
93 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
94 pr_debug("perf_evsel__read_on_cpu\n");
99 expected = nr_openat_calls + cpu;
100 if (perf_counts(evsel->counts, cpu, 0)->val != expected) {
101 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
102 expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val);
107 perf_evsel__free_counts(evsel);
109 perf_evsel__close_fd(evsel, 1, threads->nr);
111 perf_evsel__delete(evsel);
112 out_thread_map_delete:
113 thread_map__put(threads);