1 #include <api/fs/fs.h> 2 #include <linux/err.h> 3 #include "evsel.h" 4 #include "tests.h" 5 #include "thread_map.h" 6 #include "cpumap.h" 7 #include "debug.h" 8 #include "stat.h" 9 10 int test__openat_syscall_event_on_all_cpus(void) 11 { 12 int err = -1, fd, cpu; 13 struct cpu_map *cpus; 14 struct perf_evsel *evsel; 15 unsigned int nr_openat_calls = 111, i; 16 cpu_set_t cpu_set; 17 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); 18 char sbuf[STRERR_BUFSIZE]; 19 char errbuf[BUFSIZ]; 20 21 if (threads == NULL) { 22 pr_debug("thread_map__new\n"); 23 return -1; 24 } 25 26 cpus = cpu_map__new(NULL); 27 if (cpus == NULL) { 28 pr_debug("cpu_map__new\n"); 29 goto out_thread_map_delete; 30 } 31 32 CPU_ZERO(&cpu_set); 33 34 evsel = perf_evsel__newtp("syscalls", "sys_enter_openat"); 35 if (IS_ERR(evsel)) { 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; 39 } 40 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; 46 } 47 48 for (cpu = 0; cpu < cpus->nr; ++cpu) { 49 unsigned int ncalls = nr_openat_calls + cpu; 50 /* 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 :-) 55 */ 56 if (cpus->map[cpu] >= CPU_SETSIZE) { 57 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]); 58 continue; 59 } 60 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 ", 64 cpus->map[cpu], 65 strerror_r(errno, sbuf, sizeof(sbuf))); 66 goto out_close_fd; 67 } 68 for (i = 0; i < ncalls; ++i) { 69 fd = openat(0, "/etc/passwd", O_RDONLY); 70 close(fd); 71 } 72 CPU_CLR(cpus->map[cpu], &cpu_set); 73 } 74 75 /* 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. 79 */ 80 if (perf_evsel__alloc_counts(evsel, cpus->nr, 1) < 0) { 81 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr); 82 goto out_close_fd; 83 } 84 85 err = 0; 86 87 for (cpu = 0; cpu < cpus->nr; ++cpu) { 88 unsigned int expected; 89 90 if (cpus->map[cpu] >= CPU_SETSIZE) 91 continue; 92 93 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) { 94 pr_debug("perf_evsel__read_on_cpu\n"); 95 err = -1; 96 break; 97 } 98 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); 103 err = -1; 104 } 105 } 106 107 perf_evsel__free_counts(evsel); 108 out_close_fd: 109 perf_evsel__close_fd(evsel, 1, threads->nr); 110 out_evsel_delete: 111 perf_evsel__delete(evsel); 112 out_thread_map_delete: 113 thread_map__put(threads); 114 return err; 115 } 116