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