~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/perf/tests/task-exit.c

Version: ~ [ linux-5.2-rc1 ] ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         struct cpu_map *cpus;
 47         struct thread_map *threads;
 48 
 49         signal(SIGCHLD, sig_handler);
 50 
 51         evlist = perf_evlist__new_default();
 52         if (evlist == NULL) {
 53                 pr_debug("perf_evlist__new_default\n");
 54                 return -1;
 55         }
 56 
 57         /*
 58          * Create maps of threads and cpus to monitor. In this case
 59          * we start with all threads and cpus (-1, -1) but then in
 60          * perf_evlist__prepare_workload we'll fill in the only thread
 61          * we're monitoring, the one forked there.
 62          */
 63         cpus = cpu_map__dummy_new();
 64         threads = thread_map__new_by_tid(-1);
 65         if (!cpus || !threads) {
 66                 err = -ENOMEM;
 67                 pr_debug("Not enough memory to create thread/cpu maps\n");
 68                 goto out_free_maps;
 69         }
 70 
 71         perf_evlist__set_maps(evlist, cpus, threads);
 72 
 73         cpus    = NULL;
 74         threads = NULL;
 75 
 76         err = perf_evlist__prepare_workload(evlist, &target, argv, false,
 77                                             workload_exec_failed_signal);
 78         if (err < 0) {
 79                 pr_debug("Couldn't run the workload!\n");
 80                 goto out_delete_evlist;
 81         }
 82 
 83         evsel = perf_evlist__first(evlist);
 84         evsel->attr.task = 1;
 85         evsel->attr.sample_freq = 0;
 86         evsel->attr.inherit = 0;
 87         evsel->attr.watermark = 0;
 88         evsel->attr.wakeup_events = 1;
 89         evsel->attr.exclude_kernel = 1;
 90 
 91         err = perf_evlist__open(evlist);
 92         if (err < 0) {
 93                 pr_debug("Couldn't open the evlist: %s\n",
 94                          strerror_r(-err, sbuf, sizeof(sbuf)));
 95                 goto out_delete_evlist;
 96         }
 97 
 98         if (perf_evlist__mmap(evlist, 128, true) < 0) {
 99                 pr_debug("failed to mmap events: %d (%s)\n", errno,
100                          strerror_r(errno, sbuf, sizeof(sbuf)));
101                 goto out_delete_evlist;
102         }
103 
104         perf_evlist__start_workload(evlist);
105 
106 retry:
107         while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
108                 if (event->header.type == PERF_RECORD_EXIT)
109                         nr_exit++;
110 
111                 perf_evlist__mmap_consume(evlist, 0);
112         }
113 
114         if (!exited || !nr_exit) {
115                 perf_evlist__poll(evlist, -1);
116                 goto retry;
117         }
118 
119         if (nr_exit != 1) {
120                 pr_debug("received %d EXIT records\n", nr_exit);
121                 err = -1;
122         }
123 
124 out_free_maps:
125         cpu_map__put(cpus);
126         thread_map__put(threads);
127 out_delete_evlist:
128         perf_evlist__delete(evlist);
129         return err;
130 }
131 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp