| // 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> |
| |
| static int exited; |
| static int nr_exit; |
| |
| static void sig_handler(int sig __maybe_unused) |
| { |
| exited = 1; |
| } |
| |
| /* |
| * perf_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 = perf_evlist__new_default(); |
| if (evlist == NULL) { |
| pr_debug("perf_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 |
| * perf_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 = perf_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; |
| } |
| |
| perf_evlist__start_workload(evlist); |
| |
| retry: |
| md = &evlist->mmap[0]; |
| if (perf_mmap__read_init(md) < 0) |
| goto out_init; |
| |
| while ((event = perf_mmap__read_event(md)) != NULL) { |
| if (event->header.type == PERF_RECORD_EXIT) |
| nr_exit++; |
| |
| perf_mmap__consume(md); |
| } |
| perf_mmap__read_done(md); |
| |
| 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; |
| } |