// SPDX-License-Identifier: GPL-2.0
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "tests.h"
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#include <errno.h>
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#include <signal.h>
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static int exited;
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static int nr_exit;
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static void sig_handler(int sig __maybe_unused)
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{
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exited = 1;
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}
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/*
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* perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
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* we asked by setting its exec_error to this handler.
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*/
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static void workload_exec_failed_signal(int signo __maybe_unused,
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siginfo_t *info __maybe_unused,
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void *ucontext __maybe_unused)
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{
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exited = 1;
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nr_exit = -1;
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}
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/*
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* This test will start a workload that does nothing then it checks
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* if the number of exit event reported by the kernel is 1 or not
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* in order to check the kernel returns correct number of event.
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*/
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int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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int err = -1;
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union perf_event *event;
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struct perf_evsel *evsel;
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struct perf_evlist *evlist;
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struct target target = {
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.uid = UINT_MAX,
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.uses_mmap = true,
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};
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const char *argv[] = { "true", NULL };
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char sbuf[STRERR_BUFSIZE];
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struct cpu_map *cpus;
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struct thread_map *threads;
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struct perf_mmap *md;
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signal(SIGCHLD, sig_handler);
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evlist = perf_evlist__new_default();
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if (evlist == NULL) {
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pr_debug("perf_evlist__new_default\n");
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return -1;
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}
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/*
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* Create maps of threads and cpus to monitor. In this case
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* we start with all threads and cpus (-1, -1) but then in
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* perf_evlist__prepare_workload we'll fill in the only thread
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* we're monitoring, the one forked there.
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*/
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cpus = cpu_map__dummy_new();
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threads = thread_map__new_by_tid(-1);
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if (!cpus || !threads) {
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err = -ENOMEM;
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pr_debug("Not enough memory to create thread/cpu maps\n");
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goto out_free_maps;
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}
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perf_evlist__set_maps(evlist, cpus, threads);
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cpus = NULL;
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threads = NULL;
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err = perf_evlist__prepare_workload(evlist, &target, argv, false,
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workload_exec_failed_signal);
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if (err < 0) {
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pr_debug("Couldn't run the workload!\n");
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goto out_delete_evlist;
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}
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evsel = perf_evlist__first(evlist);
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evsel->attr.task = 1;
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#ifdef __s390x__
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evsel->attr.sample_freq = 1000000;
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#else
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evsel->attr.sample_freq = 1;
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#endif
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evsel->attr.inherit = 0;
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evsel->attr.watermark = 0;
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evsel->attr.wakeup_events = 1;
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evsel->attr.exclude_kernel = 1;
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err = perf_evlist__open(evlist);
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if (err < 0) {
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pr_debug("Couldn't open the evlist: %s\n",
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str_error_r(-err, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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if (perf_evlist__mmap(evlist, 128) < 0) {
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pr_debug("failed to mmap events: %d (%s)\n", errno,
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str_error_r(errno, sbuf, sizeof(sbuf)));
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err = -1;
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goto out_delete_evlist;
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}
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perf_evlist__start_workload(evlist);
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retry:
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md = &evlist->mmap[0];
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if (perf_mmap__read_init(md) < 0)
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goto out_init;
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while ((event = perf_mmap__read_event(md)) != NULL) {
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if (event->header.type == PERF_RECORD_EXIT)
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nr_exit++;
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perf_mmap__consume(md);
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}
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perf_mmap__read_done(md);
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out_init:
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if (!exited || !nr_exit) {
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perf_evlist__poll(evlist, -1);
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goto retry;
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}
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if (nr_exit != 1) {
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pr_debug("received %d EXIT records\n", nr_exit);
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err = -1;
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}
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out_free_maps:
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cpu_map__put(cpus);
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thread_map__put(threads);
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out_delete_evlist:
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perf_evlist__delete(evlist);
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return err;
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}
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