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) 13 { 14 exited = 1; 15 16 if (sig == SIGUSR1) 17 nr_exit = -1; 18 } 19 20 /* 21 * This test will start a workload that does nothing then it checks 22 * if the number of exit event reported by the kernel is 1 or not 23 * in order to check the kernel returns correct number of event. 24 */ 25 int test__task_exit(void) 26 { 27 int err = -1; 28 union perf_event *event; 29 struct perf_evsel *evsel; 30 struct perf_evlist *evlist; 31 struct target target = { 32 .uid = UINT_MAX, 33 .uses_mmap = true, 34 }; 35 const char *argv[] = { "true", NULL }; 36 37 signal(SIGCHLD, sig_handler); 38 signal(SIGUSR1, sig_handler); 39 40 evlist = perf_evlist__new_default(); 41 if (evlist == NULL) { 42 pr_debug("perf_evlist__new_default\n"); 43 return -1; 44 } 45 46 /* 47 * Create maps of threads and cpus to monitor. In this case 48 * we start with all threads and cpus (-1, -1) but then in 49 * perf_evlist__prepare_workload we'll fill in the only thread 50 * we're monitoring, the one forked there. 51 */ 52 evlist->cpus = cpu_map__dummy_new(); 53 evlist->threads = thread_map__new_by_tid(-1); 54 if (!evlist->cpus || !evlist->threads) { 55 err = -ENOMEM; 56 pr_debug("Not enough memory to create thread/cpu maps\n"); 57 goto out_delete_maps; 58 } 59 60 err = perf_evlist__prepare_workload(evlist, &target, argv, false, true); 61 if (err < 0) { 62 pr_debug("Couldn't run the workload!\n"); 63 goto out_delete_maps; 64 } 65 66 evsel = perf_evlist__first(evlist); 67 evsel->attr.task = 1; 68 evsel->attr.sample_freq = 0; 69 evsel->attr.inherit = 0; 70 evsel->attr.watermark = 0; 71 evsel->attr.wakeup_events = 1; 72 evsel->attr.exclude_kernel = 1; 73 74 err = perf_evlist__open(evlist); 75 if (err < 0) { 76 pr_debug("Couldn't open the evlist: %s\n", strerror(-err)); 77 goto out_delete_maps; 78 } 79 80 if (perf_evlist__mmap(evlist, 128, true) < 0) { 81 pr_debug("failed to mmap events: %d (%s)\n", errno, 82 strerror(errno)); 83 goto out_close_evlist; 84 } 85 86 perf_evlist__start_workload(evlist); 87 88 retry: 89 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 90 if (event->header.type == PERF_RECORD_EXIT) 91 nr_exit++; 92 93 perf_evlist__mmap_consume(evlist, 0); 94 } 95 96 if (!exited || !nr_exit) { 97 poll(evlist->pollfd, evlist->nr_fds, -1); 98 goto retry; 99 } 100 101 if (nr_exit != 1) { 102 pr_debug("received %d EXIT records\n", nr_exit); 103 err = -1; 104 } 105 106 perf_evlist__munmap(evlist); 107 out_close_evlist: 108 perf_evlist__close(evlist); 109 out_delete_maps: 110 perf_evlist__delete_maps(evlist); 111 perf_evlist__delete(evlist); 112 return err; 113 } 114