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 .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 int retry_count = 0; 57 58 signal(SIGCHLD, sig_handler); 59 60 evlist = evlist__new_dummy(); 61 if (evlist == NULL) { 62 pr_debug("evlist__new_dummy\n"); 63 return -1; 64 } 65 66 /* 67 * Create maps of threads and cpus to monitor. In this case 68 * we start with all threads and cpus (-1, -1) but then in 69 * evlist__prepare_workload we'll fill in the only thread 70 * we're monitoring, the one forked there. 71 */ 72 cpus = perf_cpu_map__new_any_cpu(); 73 threads = thread_map__new_by_tid(-1); 74 if (!cpus || !threads) { 75 err = -ENOMEM; 76 pr_debug("Not enough memory to create thread/cpu maps\n"); 77 goto out_delete_evlist; 78 } 79 80 perf_evlist__set_maps(&evlist->core, cpus, threads); 81 82 err = evlist__prepare_workload(evlist, &target, argv, false, workload_exec_failed_signal); 83 if (err < 0) { 84 pr_debug("Couldn't run the workload!\n"); 85 goto out_delete_evlist; 86 } 87 88 evsel = evlist__first(evlist); 89 evsel->core.attr.task = 1; 90 #ifdef __s390x__ 91 evsel->core.attr.sample_freq = 1000000; 92 #else 93 evsel->core.attr.sample_freq = 1; 94 #endif 95 evsel->core.attr.inherit = 0; 96 evsel->core.attr.watermark = 0; 97 evsel->core.attr.wakeup_events = 1; 98 evsel->core.attr.exclude_kernel = 1; 99 100 err = evlist__open(evlist); 101 if (err < 0) { 102 pr_debug("Couldn't open the evlist: %s\n", 103 str_error_r(-err, sbuf, sizeof(sbuf))); 104 goto out_delete_evlist; 105 } 106 107 if (evlist__mmap(evlist, 128) < 0) { 108 pr_debug("failed to mmap events: %d (%s)\n", errno, 109 str_error_r(errno, sbuf, sizeof(sbuf))); 110 err = -1; 111 goto out_delete_evlist; 112 } 113 114 evlist__start_workload(evlist); 115 116 retry: 117 md = &evlist->mmap[0]; 118 if (perf_mmap__read_init(&md->core) < 0) 119 goto out_init; 120 121 while ((event = perf_mmap__read_event(&md->core)) != NULL) { 122 if (event->header.type == PERF_RECORD_EXIT) 123 nr_exit++; 124 125 perf_mmap__consume(&md->core); 126 } 127 perf_mmap__read_done(&md->core); 128 129 out_init: 130 if (!exited || !nr_exit) { 131 evlist__poll(evlist, -1); 132 133 if (retry_count++ > 1000) { 134 pr_debug("Failed after retrying 1000 times\n"); 135 err = -1; 136 goto out_delete_evlist; 137 } 138 139 goto retry; 140 } 141 142 if (nr_exit != 1) { 143 pr_debug("received %d EXIT records\n", nr_exit); 144 err = -1; 145 } 146 147 out_delete_evlist: 148 perf_cpu_map__put(cpus); 149 perf_thread_map__put(threads); 150 evlist__delete(evlist); 151 return err; 152 } 153 154 struct test_case tests__task_exit[] = { 155 TEST_CASE_EXCLUSIVE("Number of exit events of a simple workload", task_exit), 156 { .name = NULL, } 157 }; 158 struct test_suite suite__task_exit = { 159 .desc = "Number of exit events of a simple workload", 160 .test_cases = tests__task_exit, 161 }; 162