1 #include "evlist.h" 2 #include "evsel.h" 3 #include "thread_map.h" 4 #include "cpumap.h" 5 #include "tests.h" 6 7 #include <signal.h> 8 9 static int exited; 10 static int nr_exit; 11 12 static void sig_handler(int sig __maybe_unused) 13 { 14 exited = 1; 15 } 16 17 /* 18 * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since 19 * we asked by setting its exec_error to this handler. 20 */ 21 static void workload_exec_failed_signal(int signo __maybe_unused, 22 siginfo_t *info __maybe_unused, 23 void *ucontext __maybe_unused) 24 { 25 exited = 1; 26 nr_exit = -1; 27 } 28 29 /* 30 * This test will start a workload that does nothing then it checks 31 * if the number of exit event reported by the kernel is 1 or not 32 * in order to check the kernel returns correct number of event. 33 */ 34 int test__task_exit(void) 35 { 36 int err = -1; 37 union perf_event *event; 38 struct perf_evsel *evsel; 39 struct perf_evlist *evlist; 40 struct target target = { 41 .uid = UINT_MAX, 42 .uses_mmap = true, 43 }; 44 const char *argv[] = { "true", NULL }; 45 char sbuf[STRERR_BUFSIZE]; 46 struct cpu_map *cpus; 47 struct thread_map *threads; 48 49 signal(SIGCHLD, sig_handler); 50 51 evlist = perf_evlist__new_default(); 52 if (evlist == NULL) { 53 pr_debug("perf_evlist__new_default\n"); 54 return -1; 55 } 56 57 /* 58 * Create maps of threads and cpus to monitor. In this case 59 * we start with all threads and cpus (-1, -1) but then in 60 * perf_evlist__prepare_workload we'll fill in the only thread 61 * we're monitoring, the one forked there. 62 */ 63 cpus = cpu_map__dummy_new(); 64 threads = thread_map__new_by_tid(-1); 65 if (!cpus || !threads) { 66 err = -ENOMEM; 67 pr_debug("Not enough memory to create thread/cpu maps\n"); 68 goto out_free_maps; 69 } 70 71 perf_evlist__set_maps(evlist, cpus, threads); 72 73 cpus = NULL; 74 threads = NULL; 75 76 err = perf_evlist__prepare_workload(evlist, &target, argv, false, 77 workload_exec_failed_signal); 78 if (err < 0) { 79 pr_debug("Couldn't run the workload!\n"); 80 goto out_delete_evlist; 81 } 82 83 evsel = perf_evlist__first(evlist); 84 evsel->attr.task = 1; 85 evsel->attr.sample_freq = 0; 86 evsel->attr.inherit = 0; 87 evsel->attr.watermark = 0; 88 evsel->attr.wakeup_events = 1; 89 evsel->attr.exclude_kernel = 1; 90 91 err = perf_evlist__open(evlist); 92 if (err < 0) { 93 pr_debug("Couldn't open the evlist: %s\n", 94 strerror_r(-err, sbuf, sizeof(sbuf))); 95 goto out_delete_evlist; 96 } 97 98 if (perf_evlist__mmap(evlist, 128, true) < 0) { 99 pr_debug("failed to mmap events: %d (%s)\n", errno, 100 strerror_r(errno, sbuf, sizeof(sbuf))); 101 goto out_delete_evlist; 102 } 103 104 perf_evlist__start_workload(evlist); 105 106 retry: 107 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 108 if (event->header.type == PERF_RECORD_EXIT) 109 nr_exit++; 110 111 perf_evlist__mmap_consume(evlist, 0); 112 } 113 114 if (!exited || !nr_exit) { 115 perf_evlist__poll(evlist, -1); 116 goto retry; 117 } 118 119 if (nr_exit != 1) { 120 pr_debug("received %d EXIT records\n", nr_exit); 121 err = -1; 122 } 123 124 out_free_maps: 125 cpu_map__put(cpus); 126 thread_map__put(threads); 127 out_delete_evlist: 128 perf_evlist__delete(evlist); 129 return err; 130 } 131