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 46 signal(SIGCHLD, sig_handler); 47 48 evlist = perf_evlist__new_default(); 49 if (evlist == NULL) { 50 pr_debug("perf_evlist__new_default\n"); 51 return -1; 52 } 53 54 /* 55 * Create maps of threads and cpus to monitor. In this case 56 * we start with all threads and cpus (-1, -1) but then in 57 * perf_evlist__prepare_workload we'll fill in the only thread 58 * we're monitoring, the one forked there. 59 */ 60 evlist->cpus = cpu_map__dummy_new(); 61 evlist->threads = thread_map__new_by_tid(-1); 62 if (!evlist->cpus || !evlist->threads) { 63 err = -ENOMEM; 64 pr_debug("Not enough memory to create thread/cpu maps\n"); 65 goto out_delete_evlist; 66 } 67 68 err = perf_evlist__prepare_workload(evlist, &target, argv, false, 69 workload_exec_failed_signal); 70 if (err < 0) { 71 pr_debug("Couldn't run the workload!\n"); 72 goto out_delete_evlist; 73 } 74 75 evsel = perf_evlist__first(evlist); 76 evsel->attr.task = 1; 77 evsel->attr.sample_freq = 0; 78 evsel->attr.inherit = 0; 79 evsel->attr.watermark = 0; 80 evsel->attr.wakeup_events = 1; 81 evsel->attr.exclude_kernel = 1; 82 83 err = perf_evlist__open(evlist); 84 if (err < 0) { 85 pr_debug("Couldn't open the evlist: %s\n", strerror(-err)); 86 goto out_delete_evlist; 87 } 88 89 if (perf_evlist__mmap(evlist, 128, true) < 0) { 90 pr_debug("failed to mmap events: %d (%s)\n", errno, 91 strerror(errno)); 92 goto out_delete_evlist; 93 } 94 95 perf_evlist__start_workload(evlist); 96 97 retry: 98 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 99 if (event->header.type == PERF_RECORD_EXIT) 100 nr_exit++; 101 102 perf_evlist__mmap_consume(evlist, 0); 103 } 104 105 if (!exited || !nr_exit) { 106 poll(evlist->pollfd, evlist->nr_fds, -1); 107 goto retry; 108 } 109 110 if (nr_exit != 1) { 111 pr_debug("received %d EXIT records\n", nr_exit); 112 err = -1; 113 } 114 115 out_delete_evlist: 116 perf_evlist__delete(evlist); 117 return err; 118 } 119