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 #include <perf/mmap.h> 16 17 static int exited; 18 static int nr_exit; 19 20 static void sig_handler(int sig __maybe_unused) 21 { 22 exited = 1; 23 } 24 25 /* 26 * evlist__prepare_workload will send a SIGUSR1 if the fork fails, since 27 * we asked by setting its exec_error to this handler. 28 */ 29 static void workload_exec_failed_signal(int signo __maybe_unused, 30 siginfo_t *info __maybe_unused, 31 void *ucontext __maybe_unused) 32 { 33 exited = 1; 34 nr_exit = -1; 35 } 36 37 /* 38 * This test will start a workload that does nothing then it checks 39 * if the number of exit event reported by the kernel is 1 or not 40 * in order to check the kernel returns correct number of event. 41 */ 42 static int test__task_exit(struct test_suite *test __maybe_unused, int subtest __maybe_unused) 43 { 44 int err = -1; 45 union perf_event *event; 46 struct evsel *evsel; 47 struct evlist *evlist; 48 struct target target = { 49 .uid = UINT_MAX, 50 .uses_mmap = true, 51 }; 52 const char *argv[] = { "true", NULL }; 53 char sbuf[STRERR_BUFSIZE]; 54 struct perf_cpu_map *cpus; 55 struct perf_thread_map *threads; 56 struct mmap *md; 57 int retry_count = 0; 58 59 signal(SIGCHLD, sig_handler); 60 61 evlist = evlist__new_default(); 62 if (evlist == NULL) { 63 pr_debug("evlist__new_default\n"); 64 return -1; 65 } 66 67 /* 68 * Create maps of threads and cpus to monitor. In this case 69 * we start with all threads and cpus (-1, -1) but then in 70 * evlist__prepare_workload we'll fill in the only thread 71 * we're monitoring, the one forked there. 72 */ 73 cpus = perf_cpu_map__dummy_new(); 74 threads = thread_map__new_by_tid(-1); 75 if (!cpus || !threads) { 76 err = -ENOMEM; 77 pr_debug("Not enough memory to create thread/cpu maps\n"); 78 goto out_delete_evlist; 79 } 80 81 perf_evlist__set_maps(&evlist->core, cpus, threads); 82 83 err = evlist__prepare_workload(evlist, &target, argv, false, workload_exec_failed_signal); 84 if (err < 0) { 85 pr_debug("Couldn't run the workload!\n"); 86 goto out_delete_evlist; 87 } 88 89 evsel = evlist__first(evlist); 90 evsel->core.attr.task = 1; 91 #ifdef __s390x__ 92 evsel->core.attr.sample_freq = 1000000; 93 #else 94 evsel->core.attr.sample_freq = 1; 95 #endif 96 evsel->core.attr.inherit = 0; 97 evsel->core.attr.watermark = 0; 98 evsel->core.attr.wakeup_events = 1; 99 evsel->core.attr.exclude_kernel = 1; 100 101 err = evlist__open(evlist); 102 if (err < 0) { 103 pr_debug("Couldn't open the evlist: %s\n", 104 str_error_r(-err, sbuf, sizeof(sbuf))); 105 goto out_delete_evlist; 106 } 107 108 if (evlist__mmap(evlist, 128) < 0) { 109 pr_debug("failed to mmap events: %d (%s)\n", errno, 110 str_error_r(errno, sbuf, sizeof(sbuf))); 111 err = -1; 112 goto out_delete_evlist; 113 } 114 115 evlist__start_workload(evlist); 116 117 retry: 118 md = &evlist->mmap[0]; 119 if (perf_mmap__read_init(&md->core) < 0) 120 goto out_init; 121 122 while ((event = perf_mmap__read_event(&md->core)) != NULL) { 123 if (event->header.type == PERF_RECORD_EXIT) 124 nr_exit++; 125 126 perf_mmap__consume(&md->core); 127 } 128 perf_mmap__read_done(&md->core); 129 130 out_init: 131 if (!exited || !nr_exit) { 132 evlist__poll(evlist, -1); 133 134 if (retry_count++ > 1000) { 135 pr_debug("Failed after retrying 1000 times\n"); 136 err = -1; 137 goto out_delete_evlist; 138 } 139 140 goto retry; 141 } 142 143 if (nr_exit != 1) { 144 pr_debug("received %d EXIT records\n", nr_exit); 145 err = -1; 146 } 147 148 out_delete_evlist: 149 perf_cpu_map__put(cpus); 150 perf_thread_map__put(threads); 151 evlist__delete(evlist); 152 return err; 153 } 154 155 DEFINE_SUITE("Number of exit events of a simple workload", task_exit); 156