1 #include <inttypes.h> 2 /* For the CLR_() macros */ 3 #include <pthread.h> 4 5 #include "evlist.h" 6 #include "evsel.h" 7 #include "thread_map.h" 8 #include "cpumap.h" 9 #include "tests.h" 10 #include <linux/err.h> 11 #include <linux/kernel.h> 12 13 /* 14 * This test will generate random numbers of calls to some getpid syscalls, 15 * then establish an mmap for a group of events that are created to monitor 16 * the syscalls. 17 * 18 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated 19 * sample.id field to map back to its respective perf_evsel instance. 20 * 21 * Then it checks if the number of syscalls reported as perf events by 22 * the kernel corresponds to the number of syscalls made. 23 */ 24 int test__basic_mmap(int subtest __maybe_unused) 25 { 26 int err = -1; 27 union perf_event *event; 28 struct thread_map *threads; 29 struct cpu_map *cpus; 30 struct perf_evlist *evlist; 31 cpu_set_t cpu_set; 32 const char *syscall_names[] = { "getsid", "getppid", "getpgid", }; 33 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid }; 34 #define nsyscalls ARRAY_SIZE(syscall_names) 35 unsigned int nr_events[nsyscalls], 36 expected_nr_events[nsyscalls], i, j; 37 struct perf_evsel *evsels[nsyscalls], *evsel; 38 char sbuf[STRERR_BUFSIZE]; 39 40 threads = thread_map__new(-1, getpid(), UINT_MAX); 41 if (threads == NULL) { 42 pr_debug("thread_map__new\n"); 43 return -1; 44 } 45 46 cpus = cpu_map__new(NULL); 47 if (cpus == NULL) { 48 pr_debug("cpu_map__new\n"); 49 goto out_free_threads; 50 } 51 52 CPU_ZERO(&cpu_set); 53 CPU_SET(cpus->map[0], &cpu_set); 54 sched_setaffinity(0, sizeof(cpu_set), &cpu_set); 55 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { 56 pr_debug("sched_setaffinity() failed on CPU %d: %s ", 57 cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf))); 58 goto out_free_cpus; 59 } 60 61 evlist = perf_evlist__new(); 62 if (evlist == NULL) { 63 pr_debug("perf_evlist__new\n"); 64 goto out_free_cpus; 65 } 66 67 perf_evlist__set_maps(evlist, cpus, threads); 68 69 for (i = 0; i < nsyscalls; ++i) { 70 char name[64]; 71 72 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); 73 evsels[i] = perf_evsel__newtp("syscalls", name); 74 if (IS_ERR(evsels[i])) { 75 pr_debug("perf_evsel__new\n"); 76 goto out_delete_evlist; 77 } 78 79 evsels[i]->attr.wakeup_events = 1; 80 perf_evsel__set_sample_id(evsels[i], false); 81 82 perf_evlist__add(evlist, evsels[i]); 83 84 if (perf_evsel__open(evsels[i], cpus, threads) < 0) { 85 pr_debug("failed to open counter: %s, " 86 "tweak /proc/sys/kernel/perf_event_paranoid?\n", 87 str_error_r(errno, sbuf, sizeof(sbuf))); 88 goto out_delete_evlist; 89 } 90 91 nr_events[i] = 0; 92 expected_nr_events[i] = 1 + rand() % 127; 93 } 94 95 if (perf_evlist__mmap(evlist, 128, true) < 0) { 96 pr_debug("failed to mmap events: %d (%s)\n", errno, 97 str_error_r(errno, sbuf, sizeof(sbuf))); 98 goto out_delete_evlist; 99 } 100 101 for (i = 0; i < nsyscalls; ++i) 102 for (j = 0; j < expected_nr_events[i]; ++j) { 103 int foo = syscalls[i](); 104 ++foo; 105 } 106 107 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 108 struct perf_sample sample; 109 110 if (event->header.type != PERF_RECORD_SAMPLE) { 111 pr_debug("unexpected %s event\n", 112 perf_event__name(event->header.type)); 113 goto out_delete_evlist; 114 } 115 116 err = perf_evlist__parse_sample(evlist, event, &sample); 117 if (err) { 118 pr_err("Can't parse sample, err = %d\n", err); 119 goto out_delete_evlist; 120 } 121 122 err = -1; 123 evsel = perf_evlist__id2evsel(evlist, sample.id); 124 if (evsel == NULL) { 125 pr_debug("event with id %" PRIu64 126 " doesn't map to an evsel\n", sample.id); 127 goto out_delete_evlist; 128 } 129 nr_events[evsel->idx]++; 130 perf_evlist__mmap_consume(evlist, 0); 131 } 132 133 err = 0; 134 evlist__for_each_entry(evlist, evsel) { 135 if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) { 136 pr_debug("expected %d %s events, got %d\n", 137 expected_nr_events[evsel->idx], 138 perf_evsel__name(evsel), nr_events[evsel->idx]); 139 err = -1; 140 goto out_delete_evlist; 141 } 142 } 143 144 out_delete_evlist: 145 perf_evlist__delete(evlist); 146 cpus = NULL; 147 threads = NULL; 148 out_free_cpus: 149 cpu_map__put(cpus); 150 out_free_threads: 151 thread_map__put(threads); 152 return err; 153 } 154