1 /* For the CLR_() macros */ 2 #include <pthread.h> 3 4 #include "evlist.h" 5 #include "evsel.h" 6 #include "thread_map.h" 7 #include "cpumap.h" 8 #include "tests.h" 9 #include <linux/err.h> 10 11 /* 12 * This test will generate random numbers of calls to some getpid syscalls, 13 * then establish an mmap for a group of events that are created to monitor 14 * the syscalls. 15 * 16 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated 17 * sample.id field to map back to its respective perf_evsel instance. 18 * 19 * Then it checks if the number of syscalls reported as perf events by 20 * the kernel corresponds to the number of syscalls made. 21 */ 22 int test__basic_mmap(int subtest __maybe_unused) 23 { 24 int err = -1; 25 union perf_event *event; 26 struct thread_map *threads; 27 struct cpu_map *cpus; 28 struct perf_evlist *evlist; 29 cpu_set_t cpu_set; 30 const char *syscall_names[] = { "getsid", "getppid", "getpgid", }; 31 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid }; 32 #define nsyscalls ARRAY_SIZE(syscall_names) 33 unsigned int nr_events[nsyscalls], 34 expected_nr_events[nsyscalls], i, j; 35 struct perf_evsel *evsels[nsyscalls], *evsel; 36 char sbuf[STRERR_BUFSIZE]; 37 38 threads = thread_map__new(-1, getpid(), UINT_MAX); 39 if (threads == NULL) { 40 pr_debug("thread_map__new\n"); 41 return -1; 42 } 43 44 cpus = cpu_map__new(NULL); 45 if (cpus == NULL) { 46 pr_debug("cpu_map__new\n"); 47 goto out_free_threads; 48 } 49 50 CPU_ZERO(&cpu_set); 51 CPU_SET(cpus->map[0], &cpu_set); 52 sched_setaffinity(0, sizeof(cpu_set), &cpu_set); 53 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { 54 pr_debug("sched_setaffinity() failed on CPU %d: %s ", 55 cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf))); 56 goto out_free_cpus; 57 } 58 59 evlist = perf_evlist__new(); 60 if (evlist == NULL) { 61 pr_debug("perf_evlist__new\n"); 62 goto out_free_cpus; 63 } 64 65 perf_evlist__set_maps(evlist, cpus, threads); 66 67 for (i = 0; i < nsyscalls; ++i) { 68 char name[64]; 69 70 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); 71 evsels[i] = perf_evsel__newtp("syscalls", name); 72 if (IS_ERR(evsels[i])) { 73 pr_debug("perf_evsel__new\n"); 74 goto out_delete_evlist; 75 } 76 77 evsels[i]->attr.wakeup_events = 1; 78 perf_evsel__set_sample_id(evsels[i], false); 79 80 perf_evlist__add(evlist, evsels[i]); 81 82 if (perf_evsel__open(evsels[i], cpus, threads) < 0) { 83 pr_debug("failed to open counter: %s, " 84 "tweak /proc/sys/kernel/perf_event_paranoid?\n", 85 str_error_r(errno, sbuf, sizeof(sbuf))); 86 goto out_delete_evlist; 87 } 88 89 nr_events[i] = 0; 90 expected_nr_events[i] = 1 + rand() % 127; 91 } 92 93 if (perf_evlist__mmap(evlist, 128, true) < 0) { 94 pr_debug("failed to mmap events: %d (%s)\n", errno, 95 str_error_r(errno, sbuf, sizeof(sbuf))); 96 goto out_delete_evlist; 97 } 98 99 for (i = 0; i < nsyscalls; ++i) 100 for (j = 0; j < expected_nr_events[i]; ++j) { 101 int foo = syscalls[i](); 102 ++foo; 103 } 104 105 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 106 struct perf_sample sample; 107 108 if (event->header.type != PERF_RECORD_SAMPLE) { 109 pr_debug("unexpected %s event\n", 110 perf_event__name(event->header.type)); 111 goto out_delete_evlist; 112 } 113 114 err = perf_evlist__parse_sample(evlist, event, &sample); 115 if (err) { 116 pr_err("Can't parse sample, err = %d\n", err); 117 goto out_delete_evlist; 118 } 119 120 err = -1; 121 evsel = perf_evlist__id2evsel(evlist, sample.id); 122 if (evsel == NULL) { 123 pr_debug("event with id %" PRIu64 124 " doesn't map to an evsel\n", sample.id); 125 goto out_delete_evlist; 126 } 127 nr_events[evsel->idx]++; 128 perf_evlist__mmap_consume(evlist, 0); 129 } 130 131 err = 0; 132 evlist__for_each_entry(evlist, evsel) { 133 if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) { 134 pr_debug("expected %d %s events, got %d\n", 135 expected_nr_events[evsel->idx], 136 perf_evsel__name(evsel), nr_events[evsel->idx]); 137 err = -1; 138 goto out_delete_evlist; 139 } 140 } 141 142 out_delete_evlist: 143 perf_evlist__delete(evlist); 144 cpus = NULL; 145 threads = NULL; 146 out_free_cpus: 147 cpu_map__put(cpus); 148 out_free_threads: 149 thread_map__put(threads); 150 return err; 151 } 152