tools/perf/tests/perf-record.c

   1 /* For the CLR_() macros */
   2 #include <pthread.h>
   3
   4 #include <sched.h>
   5 #include "evlist.h"
   6 #include "evsel.h"
   7 #include "perf.h"
   8 #include "debug.h"
   9 #include "tests.h"
  10
  11 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp)
  12 {
  13         int i, cpu = -1, nrcpus = 1024;
  14 realloc:
  15         CPU_ZERO(maskp);
  16
  17         if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) {
  18                 if (errno == EINVAL && nrcpus < (1024 << 8)) {
  19                         nrcpus = nrcpus << 2;
  20                         goto realloc;
  21                 }
  22                 perror("sched_getaffinity");
  23                         return -1;
  24         }
  25
  26         for (i = 0; i < nrcpus; i++) {
  27                 if (CPU_ISSET(i, maskp)) {
  28                         if (cpu == -1)
  29                                 cpu = i;
  30                         else
  31                                 CPU_CLR(i, maskp);
  32                 }
  33         }
  34
  35         return cpu;
  36 }
  37
  38 int test__PERF_RECORD(int subtest __maybe_unused)
  39 {
  40         struct record_opts opts = {
  41                 .target = {
  42                         .uid = UINT_MAX,
  43                         .uses_mmap = true,
  44                 },
  45                 .no_buffering = true,
  46                 .mmap_pages   = 256,
  47         };
  48         cpu_set_t cpu_mask;
  49         size_t cpu_mask_size = sizeof(cpu_mask);
  50         struct perf_evlist *evlist = perf_evlist__new_dummy();
  51         struct perf_evsel *evsel;
  52         struct perf_sample sample;
  53         const char *cmd = "sleep";
  54         const char *argv[] = { cmd, "1", NULL, };
  55         char *bname, *mmap_filename;
  56         u64 prev_time = 0;
  57         bool found_cmd_mmap = false,
  58              found_libc_mmap = false,
  59              found_vdso_mmap = false,
  60              found_ld_mmap = false;
  61         int err = -1, errs = 0, i, wakeups = 0;
  62         u32 cpu;
  63         int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
  64         char sbuf[STRERR_BUFSIZE];
  65
  66         if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */
  67                 evlist = perf_evlist__new_default();
  68
  69         if (evlist == NULL || argv == NULL) {
  70                 pr_debug("Not enough memory to create evlist\n");
  71                 goto out;
  72         }
  73
  74         /*
  75          * Create maps of threads and cpus to monitor. In this case
  76          * we start with all threads and cpus (-1, -1) but then in
  77          * perf_evlist__prepare_workload we'll fill in the only thread
  78          * we're monitoring, the one forked there.
  79          */
  80         err = perf_evlist__create_maps(evlist, &opts.target);
  81         if (err < 0) {
  82                 pr_debug("Not enough memory to create thread/cpu maps\n");
  83                 goto out_delete_evlist;
  84         }
  85
  86         /*
  87          * Prepare the workload in argv[] to run, it'll fork it, and then wait
  88          * for perf_evlist__start_workload() to exec it. This is done this way
  89          * so that we have time to open the evlist (calling sys_perf_event_open
  90          * on all the fds) and then mmap them.
  91          */
  92         err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL);
  93         if (err < 0) {
  94                 pr_debug("Couldn't run the workload!\n");
  95                 goto out_delete_evlist;
  96         }
  97
  98         /*
  99          * Config the evsels, setting attr->comm on the first one, etc.
 100          */
 101         evsel = perf_evlist__first(evlist);
 102         perf_evsel__set_sample_bit(evsel, CPU);
 103         perf_evsel__set_sample_bit(evsel, TID);
 104         perf_evsel__set_sample_bit(evsel, TIME);
 105         perf_evlist__config(evlist, &opts, NULL);
 106
 107         err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
 108         if (err < 0) {
 109                 pr_debug("sched__get_first_possible_cpu: %s\n",
 110                          str_error_r(errno, sbuf, sizeof(sbuf)));
 111                 goto out_delete_evlist;
 112         }
 113
 114         cpu = err;
 115
 116         /*
 117          * So that we can check perf_sample.cpu on all the samples.
 118          */
 119         if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
 120                 pr_debug("sched_setaffinity: %s\n",
 121                          str_error_r(errno, sbuf, sizeof(sbuf)));
 122                 goto out_delete_evlist;
 123         }
 124
 125         /*
 126          * Call sys_perf_event_open on all the fds on all the evsels,
 127          * grouping them if asked to.
 128          */
 129         err = perf_evlist__open(evlist);
 130         if (err < 0) {
 131                 pr_debug("perf_evlist__open: %s\n",
 132                          str_error_r(errno, sbuf, sizeof(sbuf)));
 133                 goto out_delete_evlist;
 134         }
 135
 136         /*
 137          * mmap the first fd on a given CPU and ask for events for the other
 138          * fds in the same CPU to be injected in the same mmap ring buffer
 139          * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
 140          */
 141         err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
 142         if (err < 0) {
 143                 pr_debug("perf_evlist__mmap: %s\n",
 144                          str_error_r(errno, sbuf, sizeof(sbuf)));
 145                 goto out_delete_evlist;
 146         }
 147
 148         /*
 149          * Now that all is properly set up, enable the events, they will
 150          * count just on workload.pid, which will start...
 151          */
 152         perf_evlist__enable(evlist);
 153
 154         /*
 155          * Now!
 156          */
 157         perf_evlist__start_workload(evlist);
 158
 159         while (1) {
 160                 int before = total_events;
 161
 162                 for (i = 0; i < evlist->nr_mmaps; i++) {
 163                         union perf_event *event;
 164
 165                         while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 166                                 const u32 type = event->header.type;
 167                                 const char *name = perf_event__name(type);
 168
 169                                 ++total_events;
 170                                 if (type < PERF_RECORD_MAX)
 171                                         nr_events[type]++;
 172
 173                                 err = perf_evlist__parse_sample(evlist, event, &sample);
 174                                 if (err < 0) {
 175                                         if (verbose)
 176                                                 perf_event__fprintf(event, stderr);
 177                                         pr_debug("Couldn't parse sample\n");
 178                                         goto out_delete_evlist;
 179                                 }
 180
 181                                 if (verbose) {
 182                                         pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
 183                                         perf_event__fprintf(event, stderr);
 184                                 }
 185
 186                                 if (prev_time > sample.time) {
 187                                         pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
 188                                                  name, prev_time, sample.time);
 189                                         ++errs;
 190                                 }
 191
 192                                 prev_time = sample.time;
 193
 194                                 if (sample.cpu != cpu) {
 195                                         pr_debug("%s with unexpected cpu, expected %d, got %d\n",
 196                                                  name, cpu, sample.cpu);
 197                                         ++errs;
 198                                 }
 199
 200                                 if ((pid_t)sample.pid != evlist->workload.pid) {
 201                                         pr_debug("%s with unexpected pid, expected %d, got %d\n",
 202                                                  name, evlist->workload.pid, sample.pid);
 203                                         ++errs;
 204                                 }
 205
 206                                 if ((pid_t)sample.tid != evlist->workload.pid) {
 207                                         pr_debug("%s with unexpected tid, expected %d, got %d\n",
 208                                                  name, evlist->workload.pid, sample.tid);
 209                                         ++errs;
 210                                 }
 211
 212                                 if ((type == PERF_RECORD_COMM ||
 213                                      type == PERF_RECORD_MMAP ||
 214                                      type == PERF_RECORD_MMAP2 ||
 215                                      type == PERF_RECORD_FORK ||
 216                                      type == PERF_RECORD_EXIT) &&
 217                                      (pid_t)event->comm.pid != evlist->workload.pid) {
 218                                         pr_debug("%s with unexpected pid/tid\n", name);
 219                                         ++errs;
 220                                 }
 221
 222                                 if ((type == PERF_RECORD_COMM ||
 223                                      type == PERF_RECORD_MMAP ||
 224                                      type == PERF_RECORD_MMAP2) &&
 225                                      event->comm.pid != event->comm.tid) {
 226                                         pr_debug("%s with different pid/tid!\n", name);
 227                                         ++errs;
 228                                 }
 229
 230                                 switch (type) {
 231                                 case PERF_RECORD_COMM:
 232                                         if (strcmp(event->comm.comm, cmd)) {
 233                                                 pr_debug("%s with unexpected comm!\n", name);
 234                                                 ++errs;
 235                                         }
 236                                         break;
 237                                 case PERF_RECORD_EXIT:
 238                                         goto found_exit;
 239                                 case PERF_RECORD_MMAP:
 240                                         mmap_filename = event->mmap.filename;
 241                                         goto check_bname;
 242                                 case PERF_RECORD_MMAP2:
 243                                         mmap_filename = event->mmap2.filename;
 244                                 check_bname:
 245                                         bname = strrchr(mmap_filename, '/');
 246                                         if (bname != NULL) {
 247                                                 if (!found_cmd_mmap)
 248                                                         found_cmd_mmap = !strcmp(bname + 1, cmd);
 249                                                 if (!found_libc_mmap)
 250                                                         found_libc_mmap = !strncmp(bname + 1, "libc", 4);
 251                                                 if (!found_ld_mmap)
 252                                                         found_ld_mmap = !strncmp(bname + 1, "ld", 2);
 253                                         } else if (!found_vdso_mmap)
 254                                                 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
 255                                         break;
 256
 257                                 case PERF_RECORD_SAMPLE:
 258                                         /* Just ignore samples for now */
 259                                         break;
 260                                 default:
 261                                         pr_debug("Unexpected perf_event->header.type %d!\n",
 262                                                  type);
 263                                         ++errs;
 264                                 }
 265
 266                                 perf_evlist__mmap_consume(evlist, i);
 267                         }
 268                 }
 269
 270                 /*
 271                  * We don't use poll here because at least at 3.1 times the
 272                  * PERF_RECORD_{!SAMPLE} events don't honour
 273                  * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
 274                  */
 275                 if (total_events == before && false)
 276                         perf_evlist__poll(evlist, -1);
 277
 278                 sleep(1);
 279                 if (++wakeups > 5) {
 280                         pr_debug("No PERF_RECORD_EXIT event!\n");
 281                         break;
 282                 }
 283         }
 284
 285 found_exit:
 286         if (nr_events[PERF_RECORD_COMM] > 1) {
 287                 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
 288                 ++errs;
 289         }
 290
 291         if (nr_events[PERF_RECORD_COMM] == 0) {
 292                 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
 293                 ++errs;
 294         }
 295
 296         if (!found_cmd_mmap) {
 297                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
 298                 ++errs;
 299         }
 300
 301         if (!found_libc_mmap) {
 302                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
 303                 ++errs;
 304         }
 305
 306         if (!found_ld_mmap) {
 307                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
 308                 ++errs;
 309         }
 310
 311         if (!found_vdso_mmap) {
 312                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
 313                 ++errs;
 314         }
 315 out_delete_evlist:
 316         perf_evlist__delete(evlist);
 317 out:
 318         return (err < 0 || errs > 0) ? -1 : 0;
 319 }