/* * This test will start a workload that does nothing then it checks * if the number of exit event reported by the kernel is 1 or not * in order to check the kernel returns correct number of event. */ int test__task_exit(void) { int err = -1; union perf_event *event; struct perf_evsel *evsel; struct perf_evlist *evlist; struct perf_target target = { .uid = UINT_MAX, .uses_mmap = true, }; const char *argv[] = { "true", NULL }; signal(SIGCHLD, sig_handler); signal(SIGUSR1, sig_handler); evlist = perf_evlist__new(); if (evlist == NULL) { pr_debug("perf_evlist__new\n"); return -1; } /* * We need at least one evsel in the evlist, use the default * one: "cycles". */ err = perf_evlist__add_default(evlist); if (err < 0) { pr_debug("Not enough memory to create evsel\n"); goto out_free_evlist; } /* * Create maps of threads and cpus to monitor. In this case * we start with all threads and cpus (-1, -1) but then in * perf_evlist__prepare_workload we'll fill in the only thread * we're monitoring, the one forked there. */ evlist->cpus = cpu_map__dummy_new(); evlist->threads = thread_map__new_by_tid(-1); if (!evlist->cpus || !evlist->threads) { err = -ENOMEM; pr_debug("Not enough memory to create thread/cpu maps\n"); goto out_delete_maps; } err = perf_evlist__prepare_workload(evlist, &target, argv, false, true); if (err < 0) { pr_debug("Couldn't run the workload!\n"); goto out_delete_maps; } evsel = perf_evlist__first(evlist); evsel->attr.task = 1; evsel->attr.sample_freq = 0; evsel->attr.inherit = 0; evsel->attr.watermark = 0; evsel->attr.wakeup_events = 1; evsel->attr.exclude_kernel = 1; err = perf_evlist__open(evlist); if (err < 0) { pr_debug("Couldn't open the evlist: %s\n", strerror(-err)); goto out_delete_maps; } if (perf_evlist__mmap(evlist, 128, true) < 0) { pr_debug("failed to mmap events: %d (%s)\n", errno, strerror(errno)); goto out_close_evlist; } perf_evlist__start_workload(evlist); retry: while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { if (event->header.type != PERF_RECORD_EXIT) continue; nr_exit++; } if (!exited || !nr_exit) { poll(evlist->pollfd, evlist->nr_fds, -1); goto retry; } if (nr_exit != 1) { pr_debug("received %d EXIT records\n", nr_exit); err = -1; } perf_evlist__munmap(evlist); out_close_evlist: perf_evlist__close(evlist); out_delete_maps: perf_evlist__delete_maps(evlist); out_free_evlist: perf_evlist__delete(evlist); return err; }
/* * This test will open software clock events (cpu-clock, task-clock) * then check their frequency -> period conversion has no artifact of * setting period to 1 forcefully. */ static int __test__sw_clock_freq(enum perf_sw_ids clock_id) { int i, err = -1; volatile int tmp = 0; u64 total_periods = 0; int nr_samples = 0; char sbuf[STRERR_BUFSIZE]; union perf_event *event; struct perf_evsel *evsel; struct perf_evlist *evlist; struct perf_event_attr attr = { .type = PERF_TYPE_SOFTWARE, .config = clock_id, .sample_type = PERF_SAMPLE_PERIOD, .exclude_kernel = 1, .disabled = 1, .freq = 1, }; struct cpu_map *cpus; struct thread_map *threads; attr.sample_freq = 500; evlist = perf_evlist__new(); if (evlist == NULL) { pr_debug("perf_evlist__new\n"); return -1; } evsel = perf_evsel__new(&attr); if (evsel == NULL) { pr_debug("perf_evsel__new\n"); goto out_delete_evlist; } perf_evlist__add(evlist, evsel); cpus = cpu_map__dummy_new(); threads = thread_map__new_by_tid(getpid()); if (!cpus || !threads) { err = -ENOMEM; pr_debug("Not enough memory to create thread/cpu maps\n"); goto out_free_maps; } perf_evlist__set_maps(evlist, cpus, threads); cpus = NULL; threads = NULL; if (perf_evlist__open(evlist)) { const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; err = -errno; pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", str_error_r(errno, sbuf, sizeof(sbuf)), knob, (u64)attr.sample_freq); goto out_delete_evlist; } err = perf_evlist__mmap(evlist, 128); if (err < 0) { pr_debug("failed to mmap event: %d (%s)\n", errno, str_error_r(errno, sbuf, sizeof(sbuf))); goto out_delete_evlist; } perf_evlist__enable(evlist); /* collect samples */ for (i = 0; i < NR_LOOPS; i++) tmp++; perf_evlist__disable(evlist); while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { struct perf_sample sample; if (event->header.type != PERF_RECORD_SAMPLE) goto next_event; err = perf_evlist__parse_sample(evlist, event, &sample); if (err < 0) { pr_debug("Error during parse sample\n"); goto out_delete_evlist; } total_periods += sample.period; nr_samples++; next_event: perf_evlist__mmap_consume(evlist, 0); } if ((u64) nr_samples == total_periods) { pr_debug("All (%d) samples have period value of 1!\n", nr_samples); err = -1; } out_free_maps: cpu_map__put(cpus); thread_map__put(threads); out_delete_evlist: perf_evlist__delete(evlist); return err; } int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused) { int ret; ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); if (!ret) ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); return ret; }