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Linux/tools/perf/tests/task-exit.c

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  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 __maybe_unused)
 13 {
 14         exited = 1;
 15 }
 16 
 17 /*
 18  * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
 19  * we asked by setting its exec_error to this handler.
 20  */
 21 static void workload_exec_failed_signal(int signo __maybe_unused,
 22                                         siginfo_t *info __maybe_unused,
 23                                         void *ucontext __maybe_unused)
 24 {
 25         exited  = 1;
 26         nr_exit = -1;
 27 }
 28 
 29 /*
 30  * This test will start a workload that does nothing then it checks
 31  * if the number of exit event reported by the kernel is 1 or not
 32  * in order to check the kernel returns correct number of event.
 33  */
 34 int test__task_exit(void)
 35 {
 36         int err = -1;
 37         union perf_event *event;
 38         struct perf_evsel *evsel;
 39         struct perf_evlist *evlist;
 40         struct target target = {
 41                 .uid            = UINT_MAX,
 42                 .uses_mmap      = true,
 43         };
 44         const char *argv[] = { "true", NULL };
 45         char sbuf[STRERR_BUFSIZE];
 46 
 47         signal(SIGCHLD, sig_handler);
 48 
 49         evlist = perf_evlist__new_default();
 50         if (evlist == NULL) {
 51                 pr_debug("perf_evlist__new_default\n");
 52                 return -1;
 53         }
 54 
 55         /*
 56          * Create maps of threads and cpus to monitor. In this case
 57          * we start with all threads and cpus (-1, -1) but then in
 58          * perf_evlist__prepare_workload we'll fill in the only thread
 59          * we're monitoring, the one forked there.
 60          */
 61         evlist->cpus = cpu_map__dummy_new();
 62         evlist->threads = thread_map__new_by_tid(-1);
 63         if (!evlist->cpus || !evlist->threads) {
 64                 err = -ENOMEM;
 65                 pr_debug("Not enough memory to create thread/cpu maps\n");
 66                 goto out_delete_evlist;
 67         }
 68 
 69         err = perf_evlist__prepare_workload(evlist, &target, argv, false,
 70                                             workload_exec_failed_signal);
 71         if (err < 0) {
 72                 pr_debug("Couldn't run the workload!\n");
 73                 goto out_delete_evlist;
 74         }
 75 
 76         evsel = perf_evlist__first(evlist);
 77         evsel->attr.task = 1;
 78         evsel->attr.sample_freq = 0;
 79         evsel->attr.inherit = 0;
 80         evsel->attr.watermark = 0;
 81         evsel->attr.wakeup_events = 1;
 82         evsel->attr.exclude_kernel = 1;
 83 
 84         err = perf_evlist__open(evlist);
 85         if (err < 0) {
 86                 pr_debug("Couldn't open the evlist: %s\n",
 87                          strerror_r(-err, sbuf, sizeof(sbuf)));
 88                 goto out_delete_evlist;
 89         }
 90 
 91         if (perf_evlist__mmap(evlist, 128, true) < 0) {
 92                 pr_debug("failed to mmap events: %d (%s)\n", errno,
 93                          strerror_r(errno, sbuf, sizeof(sbuf)));
 94                 goto out_delete_evlist;
 95         }
 96 
 97         perf_evlist__start_workload(evlist);
 98 
 99 retry:
100         while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
101                 if (event->header.type == PERF_RECORD_EXIT)
102                         nr_exit++;
103 
104                 perf_evlist__mmap_consume(evlist, 0);
105         }
106 
107         if (!exited || !nr_exit) {
108                 perf_evlist__poll(evlist, -1);
109                 goto retry;
110         }
111 
112         if (nr_exit != 1) {
113                 pr_debug("received %d EXIT records\n", nr_exit);
114                 err = -1;
115         }
116 
117 out_delete_evlist:
118         perf_evlist__delete(evlist);
119         return err;
120 }
121 

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