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// 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.
*/
int test__task_exit(struct test *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_free_maps;
}
perf_evlist__set_maps(&evlist->core, cpus, threads);
cpus = NULL;
threads = NULL;
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_free_maps;
}
goto retry;
}
if (nr_exit != 1) {
pr_debug("received %d EXIT records\n", nr_exit);
err = -1;
}
out_free_maps:
perf_cpu_map__put(cpus);
perf_thread_map__put(threads);
out_delete_evlist:
evlist__delete(evlist);
return err;
}
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