3 #include "thread_map.h"
8 int test__openat_syscall_event_on_all_cpus(void)
10 int err = -1, fd, cpu;
12 struct perf_evsel *evsel;
13 unsigned int nr_openat_calls = 111, i;
15 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
16 char sbuf[STRERR_BUFSIZE];
18 if (threads == NULL) {
19 pr_debug("thread_map__new\n");
23 cpus = cpu_map__new(NULL);
25 pr_debug("cpu_map__new\n");
26 goto out_thread_map_delete;
31 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat");
33 if (tracefs_configured())
34 pr_debug("is tracefs mounted on /sys/kernel/tracing?\n");
35 else if (debugfs_configured())
36 pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
38 pr_debug("Neither tracefs or debugfs is enabled in this kernel\n");
39 goto out_thread_map_delete;
42 if (perf_evsel__open(evsel, cpus, threads) < 0) {
43 pr_debug("failed to open counter: %s, "
44 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
45 strerror_r(errno, sbuf, sizeof(sbuf)));
46 goto out_evsel_delete;
49 for (cpu = 0; cpu < cpus->nr; ++cpu) {
50 unsigned int ncalls = nr_openat_calls + cpu;
52 * XXX eventually lift this restriction in a way that
53 * keeps perf building on older glibc installations
54 * without CPU_ALLOC. 1024 cpus in 2010 still seems
55 * a reasonable upper limit tho :-)
57 if (cpus->map[cpu] >= CPU_SETSIZE) {
58 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
62 CPU_SET(cpus->map[cpu], &cpu_set);
63 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
64 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
66 strerror_r(errno, sbuf, sizeof(sbuf)));
69 for (i = 0; i < ncalls; ++i) {
70 fd = openat(0, "/etc/passwd", O_RDONLY);
73 CPU_CLR(cpus->map[cpu], &cpu_set);
77 * Here we need to explicitely preallocate the counts, as if
78 * we use the auto allocation it will allocate just for 1 cpu,
79 * as we start by cpu 0.
81 if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) {
82 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
88 for (cpu = 0; cpu < cpus->nr; ++cpu) {
89 unsigned int expected;
91 if (cpus->map[cpu] >= CPU_SETSIZE)
94 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
95 pr_debug("perf_evsel__read_on_cpu\n");
100 expected = nr_openat_calls + cpu;
101 if (perf_counts(evsel->counts, cpu, 0)->val != expected) {
102 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
103 expected, cpus->map[cpu], perf_counts(evsel->counts, cpu, 0)->val);
108 perf_evsel__free_counts(evsel);
110 perf_evsel__close_fd(evsel, 1, threads->nr);
112 perf_evsel__delete(evsel);
113 out_thread_map_delete:
114 thread_map__put(threads);