tools/perf/tests/task-exit.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "debug.h"
   3 #include "evlist.h"
   4 #include "evsel.h"
   5 #include "target.h"
   6 #include "thread_map.h"
   7 #include "tests.h"
   8 #include "util/mmap.h"
   9
  10 #include <errno.h>
  11 #include <signal.h>
  12 #include <linux/string.h>
  13 #include <perf/cpumap.h>
  14 #include <perf/evlist.h>
  15 #include <perf/mmap.h>
  16
  17 static int exited;
  18 static int nr_exit;
  19
  20 static void sig_handler(int sig __maybe_unused)
  21 {
  22         exited = 1;
  23 }
  24
  25 /*
  26  * evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
  27  * we asked by setting its exec_error to this handler.
  28  */
  29 static void workload_exec_failed_signal(int signo __maybe_unused,
  30                                         siginfo_t *info __maybe_unused,
  31                                         void *ucontext __maybe_unused)
  32 {
  33         exited  = 1;
  34         nr_exit = -1;
  35 }
  36
  37 /*
  38  * This test will start a workload that does nothing then it checks
  39  * if the number of exit event reported by the kernel is 1 or not
  40  * in order to check the kernel returns correct number of event.
  41  */
  42 int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused)
  43 {
  44         int err = -1;
  45         union perf_event *event;
  46         struct evsel *evsel;
  47         struct evlist *evlist;
  48         struct target target = {
  49                 .uid            = UINT_MAX,
  50                 .uses_mmap      = true,
  51         };
  52         const char *argv[] = { "true", NULL };
  53         char sbuf[STRERR_BUFSIZE];
  54         struct perf_cpu_map *cpus;
  55         struct perf_thread_map *threads;
  56         struct mmap *md;
  57         int retry_count = 0;
  58
  59         signal(SIGCHLD, sig_handler);
  60
  61         evlist = evlist__new_default();
  62         if (evlist == NULL) {
  63                 pr_debug("evlist__new_default\n");
  64                 return -1;
  65         }
  66
  67         /*
  68          * Create maps of threads and cpus to monitor. In this case
  69          * we start with all threads and cpus (-1, -1) but then in
  70          * evlist__prepare_workload we'll fill in the only thread
  71          * we're monitoring, the one forked there.
  72          */
  73         cpus = perf_cpu_map__dummy_new();
  74         threads = thread_map__new_by_tid(-1);
  75         if (!cpus || !threads) {
  76                 err = -ENOMEM;
  77                 pr_debug("Not enough memory to create thread/cpu maps\n");
  78                 goto out_delete_evlist;
  79         }
  80
  81         perf_evlist__set_maps(&evlist->core, cpus, threads);
  82
  83         err = evlist__prepare_workload(evlist, &target, argv, false, workload_exec_failed_signal);
  84         if (err < 0) {
  85                 pr_debug("Couldn't run the workload!\n");
  86                 goto out_delete_evlist;
  87         }
  88
  89         evsel = evlist__first(evlist);
  90         evsel->core.attr.task = 1;
  91 #ifdef __s390x__
  92         evsel->core.attr.sample_freq = 1000000;
  93 #else
  94         evsel->core.attr.sample_freq = 1;
  95 #endif
  96         evsel->core.attr.inherit = 0;
  97         evsel->core.attr.watermark = 0;
  98         evsel->core.attr.wakeup_events = 1;
  99         evsel->core.attr.exclude_kernel = 1;
 100
 101         err = evlist__open(evlist);
 102         if (err < 0) {
 103                 pr_debug("Couldn't open the evlist: %s\n",
 104                          str_error_r(-err, sbuf, sizeof(sbuf)));
 105                 goto out_delete_evlist;
 106         }
 107
 108         if (evlist__mmap(evlist, 128) < 0) {
 109                 pr_debug("failed to mmap events: %d (%s)\n", errno,
 110                          str_error_r(errno, sbuf, sizeof(sbuf)));
 111                 err = -1;
 112                 goto out_delete_evlist;
 113         }
 114
 115         evlist__start_workload(evlist);
 116
 117 retry:
 118         md = &evlist->mmap[0];
 119         if (perf_mmap__read_init(&md->core) < 0)
 120                 goto out_init;
 121
 122         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
 123                 if (event->header.type == PERF_RECORD_EXIT)
 124                         nr_exit++;
 125
 126                 perf_mmap__consume(&md->core);
 127         }
 128         perf_mmap__read_done(&md->core);
 129
 130 out_init:
 131         if (!exited || !nr_exit) {
 132                 evlist__poll(evlist, -1);
 133
 134                 if (retry_count++ > 1000) {
 135                         pr_debug("Failed after retrying 1000 times\n");
 136                         err = -1;
 137                         goto out_delete_evlist;
 138                 }
 139
 140                 goto retry;
 141         }
 142
 143         if (nr_exit != 1) {
 144                 pr_debug("received %d EXIT records\n", nr_exit);
 145                 err = -1;
 146         }
 147
 148 out_delete_evlist:
 149         perf_cpu_map__put(cpus);
 150         perf_thread_map__put(threads);
 151         evlist__delete(evlist);
 152         return err;
 153 }