1 // SPDX-License-Identifier: GPL-2.0 2 #include "debug.h" 3 #include "evlist.h" 4 #include "evsel.h" 5 #include "target.h" 6 #include "thread_map.h" 7 #include "tests.h" 8 #include "util/mmap.h" 9 10 #include <errno.h> 11 #include <signal.h> 12 #include <linux/string.h> 13 #include <perf/cpumap.h> 14 #include <perf/evlist.h> 15 16 static int exited; 17 static int nr_exit; 18 19 static void sig_handler(int sig __maybe_unused) 20 { 21 exited = 1; 22 } 23 24 /* 25 * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since 26 * we asked by setting its exec_error to this handler. 27 */ 28 static void workload_exec_failed_signal(int signo __maybe_unused, 29 siginfo_t *info __maybe_unused, 30 void *ucontext __maybe_unused) 31 { 32 exited = 1; 33 nr_exit = -1; 34 } 35 36 /* 37 * This test will start a workload that does nothing then it checks 38 * if the number of exit event reported by the kernel is 1 or not 39 * in order to check the kernel returns correct number of event. 40 */ 41 int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused) 42 { 43 int err = -1; 44 union perf_event *event; 45 struct evsel *evsel; 46 struct evlist *evlist; 47 struct target target = { 48 .uid = UINT_MAX, 49 .uses_mmap = true, 50 }; 51 const char *argv[] = { "true", NULL }; 52 char sbuf[STRERR_BUFSIZE]; 53 struct perf_cpu_map *cpus; 54 struct perf_thread_map *threads; 55 struct mmap *md; 56 57 signal(SIGCHLD, sig_handler); 58 59 evlist = perf_evlist__new_default(); 60 if (evlist == NULL) { 61 pr_debug("perf_evlist__new_default\n"); 62 return -1; 63 } 64 65 /* 66 * Create maps of threads and cpus to monitor. In this case 67 * we start with all threads and cpus (-1, -1) but then in 68 * perf_evlist__prepare_workload we'll fill in the only thread 69 * we're monitoring, the one forked there. 70 */ 71 cpus = perf_cpu_map__dummy_new(); 72 threads = thread_map__new_by_tid(-1); 73 if (!cpus || !threads) { 74 err = -ENOMEM; 75 pr_debug("Not enough memory to create thread/cpu maps\n"); 76 goto out_free_maps; 77 } 78 79 perf_evlist__set_maps(&evlist->core, cpus, threads); 80 81 cpus = NULL; 82 threads = NULL; 83 84 err = perf_evlist__prepare_workload(evlist, &target, argv, false, 85 workload_exec_failed_signal); 86 if (err < 0) { 87 pr_debug("Couldn't run the workload!\n"); 88 goto out_delete_evlist; 89 } 90 91 evsel = evlist__first(evlist); 92 evsel->core.attr.task = 1; 93 #ifdef __s390x__ 94 evsel->core.attr.sample_freq = 1000000; 95 #else 96 evsel->core.attr.sample_freq = 1; 97 #endif 98 evsel->core.attr.inherit = 0; 99 evsel->core.attr.watermark = 0; 100 evsel->core.attr.wakeup_events = 1; 101 evsel->core.attr.exclude_kernel = 1; 102 103 err = evlist__open(evlist); 104 if (err < 0) { 105 pr_debug("Couldn't open the evlist: %s\n", 106 str_error_r(-err, sbuf, sizeof(sbuf))); 107 goto out_delete_evlist; 108 } 109 110 if (evlist__mmap(evlist, 128) < 0) { 111 pr_debug("failed to mmap events: %d (%s)\n", errno, 112 str_error_r(errno, sbuf, sizeof(sbuf))); 113 goto out_delete_evlist; 114 } 115 116 perf_evlist__start_workload(evlist); 117 118 retry: 119 md = &evlist->mmap[0]; 120 if (perf_mmap__read_init(md) < 0) 121 goto out_init; 122 123 while ((event = perf_mmap__read_event(md)) != NULL) { 124 if (event->header.type == PERF_RECORD_EXIT) 125 nr_exit++; 126 127 perf_mmap__consume(md); 128 } 129 perf_mmap__read_done(md); 130 131 out_init: 132 if (!exited || !nr_exit) { 133 evlist__poll(evlist, -1); 134 goto retry; 135 } 136 137 if (nr_exit != 1) { 138 pr_debug("received %d EXIT records\n", nr_exit); 139 err = -1; 140 } 141 142 out_free_maps: 143 perf_cpu_map__put(cpus); 144 perf_thread_map__put(threads); 145 out_delete_evlist: 146 evlist__delete(evlist); 147 return err; 148 } 149