tools/perf/tests/task-exit.c

   1 #include "evlist.h"
   2 #include "evsel.h"
   3 #include "thread_map.h"
   4 #include "cpumap.h"
   5 #include "tests.h"
   6
   7 #include <signal.h>
   8
   9 static int exited;
  10 static int nr_exit;
  11
  12 static void sig_handler(int sig)
  13 {
  14         exited = 1;
  15
  16         if (sig == SIGUSR1)
  17                 nr_exit = -1;
  18 }
  19
  20 /*
  21  * This test will start a workload that does nothing then it checks
  22  * if the number of exit event reported by the kernel is 1 or not
  23  * in order to check the kernel returns correct number of event.
  24  */
  25 int test__task_exit(void)
  26 {
  27         int err = -1;
  28         union perf_event *event;
  29         struct perf_evsel *evsel;
  30         struct perf_evlist *evlist;
  31         struct target target = {
  32                 .uid            = UINT_MAX,
  33                 .uses_mmap      = true,
  34         };
  35         const char *argv[] = { "true", NULL };
  36
  37         signal(SIGCHLD, sig_handler);
  38         signal(SIGUSR1, sig_handler);
  39
  40         evlist = perf_evlist__new_default();
  41         if (evlist == NULL) {
  42                 pr_debug("perf_evlist__new_default\n");
  43                 return -1;
  44         }
  45
  46         /*
  47          * Create maps of threads and cpus to monitor. In this case
  48          * we start with all threads and cpus (-1, -1) but then in
  49          * perf_evlist__prepare_workload we'll fill in the only thread
  50          * we're monitoring, the one forked there.
  51          */
  52         evlist->cpus = cpu_map__dummy_new();
  53         evlist->threads = thread_map__new_by_tid(-1);
  54         if (!evlist->cpus || !evlist->threads) {
  55                 err = -ENOMEM;
  56                 pr_debug("Not enough memory to create thread/cpu maps\n");
  57                 goto out_delete_maps;
  58         }
  59
  60         err = perf_evlist__prepare_workload(evlist, &target, argv, false, true);
  61         if (err < 0) {
  62                 pr_debug("Couldn't run the workload!\n");
  63                 goto out_delete_maps;
  64         }
  65
  66         evsel = perf_evlist__first(evlist);
  67         evsel->attr.task = 1;
  68         evsel->attr.sample_freq = 0;
  69         evsel->attr.inherit = 0;
  70         evsel->attr.watermark = 0;
  71         evsel->attr.wakeup_events = 1;
  72         evsel->attr.exclude_kernel = 1;
  73
  74         err = perf_evlist__open(evlist);
  75         if (err < 0) {
  76                 pr_debug("Couldn't open the evlist: %s\n", strerror(-err));
  77                 goto out_delete_maps;
  78         }
  79
  80         if (perf_evlist__mmap(evlist, 128, true) < 0) {
  81                 pr_debug("failed to mmap events: %d (%s)\n", errno,
  82                          strerror(errno));
  83                 goto out_close_evlist;
  84         }
  85
  86         perf_evlist__start_workload(evlist);
  87
  88 retry:
  89         while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
  90                 if (event->header.type == PERF_RECORD_EXIT)
  91                         nr_exit++;
  92
  93                 perf_evlist__mmap_consume(evlist, 0);
  94         }
  95
  96         if (!exited || !nr_exit) {
  97                 poll(evlist->pollfd, evlist->nr_fds, -1);
  98                 goto retry;
  99         }
 100
 101         if (nr_exit != 1) {
 102                 pr_debug("received %d EXIT records\n", nr_exit);
 103                 err = -1;
 104         }
 105
 106         perf_evlist__munmap(evlist);
 107 out_close_evlist:
 108         perf_evlist__close(evlist);
 109 out_delete_maps:
 110         perf_evlist__delete_maps(evlist);
 111         perf_evlist__delete(evlist);
 112         return err;
 113 }