1 #include "evsel.h" 2 #include "tests.h" 3 #include "thread_map.h" 4 #include "cpumap.h" 5 #include "debug.h" 6 #include "stat.h" 7 8 int test__openat_syscall_event_on_all_cpus(void) 9 { 10 int err = -1, fd, cpu; 11 struct cpu_map *cpus; 12 struct perf_evsel *evsel; 13 unsigned int nr_openat_calls = 111, i; 14 cpu_set_t cpu_set; 15 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); 16 char sbuf[STRERR_BUFSIZE]; 17 18 if (threads == NULL) { 19 pr_debug("thread_map__new\n"); 20 return -1; 21 } 22 23 cpus = cpu_map__new(NULL); 24 if (cpus == NULL) { 25 pr_debug("cpu_map__new\n"); 26 goto out_thread_map_delete; 27 } 28 29 CPU_ZERO(&cpu_set); 30 31 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat"); 32 if (evsel == NULL) { 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"); 37 else 38 pr_debug("Neither tracefs or debugfs is enabled in this kernel\n"); 39 goto out_thread_map_delete; 40 } 41 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; 47 } 48 49 for (cpu = 0; cpu < cpus->nr; ++cpu) { 50 unsigned int ncalls = nr_openat_calls + cpu; 51 /* 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 :-) 56 */ 57 if (cpus->map[cpu] >= CPU_SETSIZE) { 58 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]); 59 continue; 60 } 61 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 ", 65 cpus->map[cpu], 66 strerror_r(errno, sbuf, sizeof(sbuf))); 67 goto out_close_fd; 68 } 69 for (i = 0; i < ncalls; ++i) { 70 fd = openat(0, "/etc/passwd", O_RDONLY); 71 close(fd); 72 } 73 CPU_CLR(cpus->map[cpu], &cpu_set); 74 } 75 76 /* 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. 80 */ 81 if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) { 82 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr); 83 goto out_close_fd; 84 } 85 86 err = 0; 87 88 for (cpu = 0; cpu < cpus->nr; ++cpu) { 89 unsigned int expected; 90 91 if (cpus->map[cpu] >= CPU_SETSIZE) 92 continue; 93 94 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) { 95 pr_debug("perf_evsel__read_on_cpu\n"); 96 err = -1; 97 break; 98 } 99 100 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); 104 err = -1; 105 } 106 } 107 108 perf_evsel__free_counts(evsel); 109 out_close_fd: 110 perf_evsel__close_fd(evsel, 1, threads->nr); 111 out_evsel_delete: 112 perf_evsel__delete(evsel); 113 out_thread_map_delete: 114 thread_map__put(threads); 115 return err; 116 } 117