// SPDX-License-Identifier: GPL-2.0 #include "debug.h" #include "evlist.h" #include "evsel.h" #include "target.h" #include "thread_map.h" #include "tests.h" #include "util/mmap.h" #include <errno.h> #include <signal.h> #include <linux/string.h> #include <perf/cpumap.h> #include <perf/evlist.h> #include <perf/mmap.h> static int exited; static int nr_exit; static void sig_handler(int sig __maybe_unused) { exited = 1; } /* * evlist__prepare_workload will send a SIGUSR1 if the fork fails, since * we asked by setting its exec_error to this handler. */ static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info __maybe_unused, void *ucontext __maybe_unused) { exited = 1; nr_exit = -1; } /* * 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. */ static int test__task_exit(struct test_suite *test __maybe_unused, int subtest __maybe_unused) { int err = -1; union perf_event *event; struct evsel *evsel; struct evlist *evlist; struct target target = { .uid = UINT_MAX, .uses_mmap = true, }; const char *argv[] = { "true", NULL }; char sbuf[STRERR_BUFSIZE]; struct perf_cpu_map *cpus; struct perf_thread_map *threads; struct mmap *md; int retry_count = 0; signal(SIGCHLD, sig_handler); evlist = evlist__new_default(); if (evlist == NULL) { pr_debug("evlist__new_default\n"); return -1; } /* * Create maps of threads and cpus to monitor. In this case * we start with all threads and cpus (-1, -1) but then in * evlist__prepare_workload we'll fill in the only thread * we're monitoring, the one forked there. */ cpus = perf_cpu_map__dummy_new(); threads = thread_map__new_by_tid(-1); if (!cpus || !threads) { err = -ENOMEM; pr_debug("Not enough memory to create thread/cpu maps\n"); goto out_delete_evlist; } perf_evlist__set_maps(&evlist->core, cpus, threads); err = evlist__prepare_workload(evlist, &target, argv, false, workload_exec_failed_signal); if (err < 0) { pr_debug("Couldn't run the workload!\n"); goto out_delete_evlist; } evsel = evlist__first(evlist); evsel->core.attr.task = 1; #ifdef __s390x__ evsel->core.attr.sample_freq = 1000000; #else evsel->core.attr.sample_freq = 1; #endif evsel->core.attr.inherit = 0; evsel->core.attr.watermark = 0; evsel->core.attr.wakeup_events = 1; evsel->core.attr.exclude_kernel = 1; err = evlist__open(evlist); if (err < 0) { pr_debug("Couldn't open the evlist: %s\n", str_error_r(-err, sbuf, sizeof(sbuf))); goto out_delete_evlist; } if (evlist__mmap(evlist, 128) < 0) { pr_debug("failed to mmap events: %d (%s)\n", errno, str_error_r(errno, sbuf, sizeof(sbuf))); err = -1; goto out_delete_evlist; } evlist__start_workload(evlist); retry: md = &evlist->mmap[0]; if (perf_mmap__read_init(&md->core) < 0) goto out_init; while ((event = perf_mmap__read_event(&md->core)) != NULL) { if (event->header.type == PERF_RECORD_EXIT) nr_exit++; perf_mmap__consume(&md->core); } perf_mmap__read_done(&md->core); out_init: if (!exited || !nr_exit) { evlist__poll(evlist, -1); if (retry_count++ > 1000) { pr_debug("Failed after retrying 1000 times\n"); err = -1; goto out_delete_evlist; } goto retry; } if (nr_exit != 1) { pr_debug("received %d EXIT records\n", nr_exit); err = -1; } out_delete_evlist: perf_cpu_map__put(cpus); perf_thread_map__put(threads); evlist__delete(evlist); return err; } DEFINE_SUITE("Number of exit events of a simple workload", task_exit);