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 47 signal(SIGCHLD, sig_handler); 48 49 evlist = perf_evlist__new_default(); 50 if (evlist == NULL) { 51 pr_debug("perf_evlist__new_default\n"); 52 return -1; 53 } 54 55 /* 56 * Create maps of threads and cpus to monitor. In this case 57 * we start with all threads and cpus (-1, -1) but then in 58 * perf_evlist__prepare_workload we'll fill in the only thread 59 * we're monitoring, the one forked there. 60 */ 61 evlist->cpus = cpu_map__dummy_new(); 62 evlist->threads = thread_map__new_by_tid(-1); 63 if (!evlist->cpus || !evlist->threads) { 64 err = -ENOMEM; 65 pr_debug("Not enough memory to create thread/cpu maps\n"); 66 goto out_delete_evlist; 67 } 68 69 err = perf_evlist__prepare_workload(evlist, &target, argv, false, 70 workload_exec_failed_signal); 71 if (err < 0) { 72 pr_debug("Couldn't run the workload!\n"); 73 goto out_delete_evlist; 74 } 75 76 evsel = perf_evlist__first(evlist); 77 evsel->attr.task = 1; 78 evsel->attr.sample_freq = 0; 79 evsel->attr.inherit = 0; 80 evsel->attr.watermark = 0; 81 evsel->attr.wakeup_events = 1; 82 evsel->attr.exclude_kernel = 1; 83 84 err = perf_evlist__open(evlist); 85 if (err < 0) { 86 pr_debug("Couldn't open the evlist: %s\n", 87 strerror_r(-err, sbuf, sizeof(sbuf))); 88 goto out_delete_evlist; 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 perf_evlist__start_workload(evlist); 98 99 retry: 100 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 101 if (event->header.type == PERF_RECORD_EXIT) 102 nr_exit++; 103 104 perf_evlist__mmap_consume(evlist, 0); 105 } 106 107 if (!exited || !nr_exit) { 108 perf_evlist__poll(evlist, -1); 109 goto retry; 110 } 111 112 if (nr_exit != 1) { 113 pr_debug("received %d EXIT records\n", nr_exit); 114 err = -1; 115 } 116 117 out_delete_evlist: 118 perf_evlist__delete(evlist); 119 return err; 120 } 121