1#include "evsel.h" 2#include "tests.h" 3#include "thread_map.h" 4#include "cpumap.h" 5#include "debug.h" 6 7int test__open_syscall_event_on_all_cpus(void) 8{ 9 int err = -1, fd, cpu; 10 struct cpu_map *cpus; 11 struct perf_evsel *evsel; 12 unsigned int nr_open_calls = 111, i; 13 cpu_set_t cpu_set; 14 struct thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX); 15 16 if (threads == NULL) { 17 pr_debug("thread_map__new\n"); 18 return -1; 19 } 20 21 cpus = cpu_map__new(NULL); 22 if (cpus == NULL) { 23 pr_debug("cpu_map__new\n"); 24 goto out_thread_map_delete; 25 } 26 27 CPU_ZERO(&cpu_set); 28 29 evsel = perf_evsel__newtp("syscalls", "sys_enter_open", 0); 30 if (evsel == NULL) { 31 pr_debug("is debugfs mounted on /sys/kernel/debug?\n"); 32 goto out_thread_map_delete; 33 } 34 35 if (perf_evsel__open(evsel, cpus, threads) < 0) { 36 pr_debug("failed to open counter: %s, " 37 "tweak /proc/sys/kernel/perf_event_paranoid?\n", 38 strerror(errno)); 39 goto out_evsel_delete; 40 } 41 42 for (cpu = 0; cpu < cpus->nr; ++cpu) { 43 unsigned int ncalls = nr_open_calls + cpu; 44 /* 45 * XXX eventually lift this restriction in a way that 46 * keeps perf building on older glibc installations 47 * without CPU_ALLOC. 1024 cpus in 2010 still seems 48 * a reasonable upper limit tho :-) 49 */ 50 if (cpus->map[cpu] >= CPU_SETSIZE) { 51 pr_debug("Ignoring CPU %d\n", cpus->map[cpu]); 52 continue; 53 } 54 55 CPU_SET(cpus->map[cpu], &cpu_set); 56 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { 57 pr_debug("sched_setaffinity() failed on CPU %d: %s ", 58 cpus->map[cpu], 59 strerror(errno)); 60 goto out_close_fd; 61 } 62 for (i = 0; i < ncalls; ++i) { 63 fd = open("/etc/passwd", O_RDONLY); 64 close(fd); 65 } 66 CPU_CLR(cpus->map[cpu], &cpu_set); 67 } 68 69 /* 70 * Here we need to explicitely preallocate the counts, as if 71 * we use the auto allocation it will allocate just for 1 cpu, 72 * as we start by cpu 0. 73 */ 74 if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) { 75 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr); 76 goto out_close_fd; 77 } 78 79 err = 0; 80 81 for (cpu = 0; cpu < cpus->nr; ++cpu) { 82 unsigned int expected; 83 84 if (cpus->map[cpu] >= CPU_SETSIZE) 85 continue; 86 87 if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) { 88 pr_debug("perf_evsel__read_on_cpu\n"); 89 err = -1; 90 break; 91 } 92 93 expected = nr_open_calls + cpu; 94 if (evsel->counts->cpu[cpu].val != expected) { 95 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n", 96 expected, cpus->map[cpu], evsel->counts->cpu[cpu].val); 97 err = -1; 98 } 99 } 100 101 perf_evsel__free_counts(evsel); 102out_close_fd: 103 perf_evsel__close_fd(evsel, 1, threads->nr); 104out_evsel_delete: 105 perf_evsel__delete(evsel); 106out_thread_map_delete: 107 thread_map__delete(threads); 108 return err; 109} 110