1 // SPDX-License-Identifier: GPL-2.0 2 #include "evlist.h" 3 #include "evsel.h" 4 #include "thread_map.h" 5 #include "cpumap.h" 6 #include "tests.h" 7 8 #include <errno.h> 9 #include <signal.h> 10 11 static int exited; 12 static int nr_exit; 13 14 static void sig_handler(int sig __maybe_unused) 15 { 16 exited = 1; 17 } 18 19 /* 20 * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since 21 * we asked by setting its exec_error to this handler. 22 */ 23 static void workload_exec_failed_signal(int signo __maybe_unused, 24 siginfo_t *info __maybe_unused, 25 void *ucontext __maybe_unused) 26 { 27 exited = 1; 28 nr_exit = -1; 29 } 30 31 /* 32 * This test will start a workload that does nothing then it checks 33 * if the number of exit event reported by the kernel is 1 or not 34 * in order to check the kernel returns correct number of event. 35 */ 36 int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused) 37 { 38 int err = -1; 39 union perf_event *event; 40 struct perf_evsel *evsel; 41 struct perf_evlist *evlist; 42 struct target target = { 43 .uid = UINT_MAX, 44 .uses_mmap = true, 45 }; 46 const char *argv[] = { "true", NULL }; 47 char sbuf[STRERR_BUFSIZE]; 48 struct cpu_map *cpus; 49 struct thread_map *threads; 50 struct perf_mmap *md; 51 52 signal(SIGCHLD, sig_handler); 53 54 evlist = perf_evlist__new_default(); 55 if (evlist == NULL) { 56 pr_debug("perf_evlist__new_default\n"); 57 return -1; 58 } 59 60 /* 61 * Create maps of threads and cpus to monitor. In this case 62 * we start with all threads and cpus (-1, -1) but then in 63 * perf_evlist__prepare_workload we'll fill in the only thread 64 * we're monitoring, the one forked there. 65 */ 66 cpus = cpu_map__dummy_new(); 67 threads = thread_map__new_by_tid(-1); 68 if (!cpus || !threads) { 69 err = -ENOMEM; 70 pr_debug("Not enough memory to create thread/cpu maps\n"); 71 goto out_free_maps; 72 } 73 74 perf_evlist__set_maps(evlist, cpus, threads); 75 76 cpus = NULL; 77 threads = NULL; 78 79 err = perf_evlist__prepare_workload(evlist, &target, argv, false, 80 workload_exec_failed_signal); 81 if (err < 0) { 82 pr_debug("Couldn't run the workload!\n"); 83 goto out_delete_evlist; 84 } 85 86 evsel = perf_evlist__first(evlist); 87 evsel->attr.task = 1; 88 #ifdef __s390x__ 89 evsel->attr.sample_freq = 1000000; 90 #else 91 evsel->attr.sample_freq = 1; 92 #endif 93 evsel->attr.inherit = 0; 94 evsel->attr.watermark = 0; 95 evsel->attr.wakeup_events = 1; 96 evsel->attr.exclude_kernel = 1; 97 98 err = perf_evlist__open(evlist); 99 if (err < 0) { 100 pr_debug("Couldn't open the evlist: %s\n", 101 str_error_r(-err, sbuf, sizeof(sbuf))); 102 goto out_delete_evlist; 103 } 104 105 if (perf_evlist__mmap(evlist, 128) < 0) { 106 pr_debug("failed to mmap events: %d (%s)\n", errno, 107 str_error_r(errno, sbuf, sizeof(sbuf))); 108 goto out_delete_evlist; 109 } 110 111 perf_evlist__start_workload(evlist); 112 113 retry: 114 md = &evlist->mmap[0]; 115 if (perf_mmap__read_init(md) < 0) 116 goto out_init; 117 118 while ((event = perf_mmap__read_event(md)) != NULL) { 119 if (event->header.type == PERF_RECORD_EXIT) 120 nr_exit++; 121 122 perf_mmap__consume(md); 123 } 124 perf_mmap__read_done(md); 125 126 out_init: 127 if (!exited || !nr_exit) { 128 perf_evlist__poll(evlist, -1); 129 goto retry; 130 } 131 132 if (nr_exit != 1) { 133 pr_debug("received %d EXIT records\n", nr_exit); 134 err = -1; 135 } 136 137 out_free_maps: 138 cpu_map__put(cpus); 139 thread_map__put(threads); 140 out_delete_evlist: 141 perf_evlist__delete(evlist); 142 return err; 143 } 144