tools/perf/tests/perf-record.c

   1 #include <sched.h>
   2 #include "evlist.h"
   3 #include "evsel.h"
   4 #include "perf.h"
   5 #include "debug.h"
   6 #include "tests.h"
   7
   8 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp)
   9 {
  10         int i, cpu = -1, nrcpus = 1024;
  11 realloc:
  12         CPU_ZERO(maskp);
  13
  14         if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) {
  15                 if (errno == EINVAL && nrcpus < (1024 << 8)) {
  16                         nrcpus = nrcpus << 2;
  17                         goto realloc;
  18                 }
  19                 perror("sched_getaffinity");
  20                         return -1;
  21         }
  22
  23         for (i = 0; i < nrcpus; i++) {
  24                 if (CPU_ISSET(i, maskp)) {
  25                         if (cpu == -1)
  26                                 cpu = i;
  27                         else
  28                                 CPU_CLR(i, maskp);
  29                 }
  30         }
  31
  32         return cpu;
  33 }
  34
  35 int test__PERF_RECORD(void)
  36 {
  37         struct perf_record_opts opts = {
  38                 .target = {
  39                         .uid = UINT_MAX,
  40                         .uses_mmap = true,
  41                 },
  42                 .no_delay   = true,
  43                 .freq       = 10,
  44                 .mmap_pages = 256,
  45         };
  46         cpu_set_t cpu_mask;
  47         size_t cpu_mask_size = sizeof(cpu_mask);
  48         struct perf_evlist *evlist = perf_evlist__new();
  49         struct perf_evsel *evsel;
  50         struct perf_sample sample;
  51         const char *cmd = "sleep";
  52         const char *argv[] = { cmd, "1", NULL, };
  53         char *bname, *mmap_filename;
  54         u64 prev_time = 0;
  55         bool found_cmd_mmap = false,
  56              found_libc_mmap = false,
  57              found_vdso_mmap = false,
  58              found_ld_mmap = false;
  59         int err = -1, errs = 0, i, wakeups = 0;
  60         u32 cpu;
  61         int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
  62
  63         if (evlist == NULL || argv == NULL) {
  64                 pr_debug("Not enough memory to create evlist\n");
  65                 goto out;
  66         }
  67
  68         /*
  69          * We need at least one evsel in the evlist, use the default
  70          * one: "cycles".
  71          */
  72         err = perf_evlist__add_default(evlist);
  73         if (err < 0) {
  74                 pr_debug("Not enough memory to create evsel\n");
  75                 goto out_delete_evlist;
  76         }
  77
  78         /*
  79          * Create maps of threads and cpus to monitor. In this case
  80          * we start with all threads and cpus (-1, -1) but then in
  81          * perf_evlist__prepare_workload we'll fill in the only thread
  82          * we're monitoring, the one forked there.
  83          */
  84         err = perf_evlist__create_maps(evlist, &opts.target);
  85         if (err < 0) {
  86                 pr_debug("Not enough memory to create thread/cpu maps\n");
  87                 goto out_delete_evlist;
  88         }
  89
  90         /*
  91          * Prepare the workload in argv[] to run, it'll fork it, and then wait
  92          * for perf_evlist__start_workload() to exec it. This is done this way
  93          * so that we have time to open the evlist (calling sys_perf_event_open
  94          * on all the fds) and then mmap them.
  95          */
  96         err = perf_evlist__prepare_workload(evlist, &opts.target, argv,
  97                                             false, false);
  98         if (err < 0) {
  99                 pr_debug("Couldn't run the workload!\n");
 100                 goto out_delete_maps;
 101         }
 102
 103         /*
 104          * Config the evsels, setting attr->comm on the first one, etc.
 105          */
 106         evsel = perf_evlist__first(evlist);
 107         perf_evsel__set_sample_bit(evsel, CPU);
 108         perf_evsel__set_sample_bit(evsel, TID);
 109         perf_evsel__set_sample_bit(evsel, TIME);
 110         perf_evlist__config(evlist, &opts);
 111
 112         err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
 113         if (err < 0) {
 114                 pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno));
 115                 goto out_delete_maps;
 116         }
 117
 118         cpu = err;
 119
 120         /*
 121          * So that we can check perf_sample.cpu on all the samples.
 122          */
 123         if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
 124                 pr_debug("sched_setaffinity: %s\n", strerror(errno));
 125                 goto out_delete_maps;
 126         }
 127
 128         /*
 129          * Call sys_perf_event_open on all the fds on all the evsels,
 130          * grouping them if asked to.
 131          */
 132         err = perf_evlist__open(evlist);
 133         if (err < 0) {
 134                 pr_debug("perf_evlist__open: %s\n", strerror(errno));
 135                 goto out_delete_maps;
 136         }
 137
 138         /*
 139          * mmap the first fd on a given CPU and ask for events for the other
 140          * fds in the same CPU to be injected in the same mmap ring buffer
 141          * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
 142          */
 143         err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
 144         if (err < 0) {
 145                 pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
 146                 goto out_close_evlist;
 147         }
 148
 149         /*
 150          * Now that all is properly set up, enable the events, they will
 151          * count just on workload.pid, which will start...
 152          */
 153         perf_evlist__enable(evlist);
 154
 155         /*
 156          * Now!
 157          */
 158         perf_evlist__start_workload(evlist);
 159
 160         while (1) {
 161                 int before = total_events;
 162
 163                 for (i = 0; i < evlist->nr_mmaps; i++) {
 164                         union perf_event *event;
 165
 166                         while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 167                                 const u32 type = event->header.type;
 168                                 const char *name = perf_event__name(type);
 169
 170                                 ++total_events;
 171                                 if (type < PERF_RECORD_MAX)
 172                                         nr_events[type]++;
 173
 174                                 err = perf_evlist__parse_sample(evlist, event, &sample);
 175                                 if (err < 0) {
 176                                         if (verbose)
 177                                                 perf_event__fprintf(event, stderr);
 178                                         pr_debug("Couldn't parse sample\n");
 179                                         goto out_err;
 180                                 }
 181
 182                                 if (verbose) {
 183                                         pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
 184                                         perf_event__fprintf(event, stderr);
 185                                 }
 186
 187                                 if (prev_time > sample.time) {
 188                                         pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
 189                                                  name, prev_time, sample.time);
 190                                         ++errs;
 191                                 }
 192
 193                                 prev_time = sample.time;
 194
 195                                 if (sample.cpu != cpu) {
 196                                         pr_debug("%s with unexpected cpu, expected %d, got %d\n",
 197                                                  name, cpu, sample.cpu);
 198                                         ++errs;
 199                                 }
 200
 201                                 if ((pid_t)sample.pid != evlist->workload.pid) {
 202                                         pr_debug("%s with unexpected pid, expected %d, got %d\n",
 203                                                  name, evlist->workload.pid, sample.pid);
 204                                         ++errs;
 205                                 }
 206
 207                                 if ((pid_t)sample.tid != evlist->workload.pid) {
 208                                         pr_debug("%s with unexpected tid, expected %d, got %d\n",
 209                                                  name, evlist->workload.pid, sample.tid);
 210                                         ++errs;
 211                                 }
 212
 213                                 if ((type == PERF_RECORD_COMM ||
 214                                      type == PERF_RECORD_MMAP ||
 215                                      type == PERF_RECORD_MMAP2 ||
 216                                      type == PERF_RECORD_FORK ||
 217                                      type == PERF_RECORD_EXIT) &&
 218                                      (pid_t)event->comm.pid != evlist->workload.pid) {
 219                                         pr_debug("%s with unexpected pid/tid\n", name);
 220                                         ++errs;
 221                                 }
 222
 223                                 if ((type == PERF_RECORD_COMM ||
 224                                      type == PERF_RECORD_MMAP ||
 225                                      type == PERF_RECORD_MMAP2) &&
 226                                      event->comm.pid != event->comm.tid) {
 227                                         pr_debug("%s with different pid/tid!\n", name);
 228                                         ++errs;
 229                                 }
 230
 231                                 switch (type) {
 232                                 case PERF_RECORD_COMM:
 233                                         if (strcmp(event->comm.comm, cmd)) {
 234                                                 pr_debug("%s with unexpected comm!\n", name);
 235                                                 ++errs;
 236                                         }
 237                                         break;
 238                                 case PERF_RECORD_EXIT:
 239                                         goto found_exit;
 240                                 case PERF_RECORD_MMAP:
 241                                         mmap_filename = event->mmap.filename;
 242                                         goto check_bname;
 243                                 case PERF_RECORD_MMAP2:
 244                                         mmap_filename = event->mmap2.filename;
 245                                 check_bname:
 246                                         bname = strrchr(mmap_filename, '/');
 247                                         if (bname != NULL) {
 248                                                 if (!found_cmd_mmap)
 249                                                         found_cmd_mmap = !strcmp(bname + 1, cmd);
 250                                                 if (!found_libc_mmap)
 251                                                         found_libc_mmap = !strncmp(bname + 1, "libc", 4);
 252                                                 if (!found_ld_mmap)
 253                                                         found_ld_mmap = !strncmp(bname + 1, "ld", 2);
 254                                         } else if (!found_vdso_mmap)
 255                                                 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
 256                                         break;
 257
 258                                 case PERF_RECORD_SAMPLE:
 259                                         /* Just ignore samples for now */
 260                                         break;
 261                                 default:
 262                                         pr_debug("Unexpected perf_event->header.type %d!\n",
 263                                                  type);
 264                                         ++errs;
 265                                 }
 266
 267                                 perf_evlist__mmap_consume(evlist, i);
 268                         }
 269                 }
 270
 271                 /*
 272                  * We don't use poll here because at least at 3.1 times the
 273                  * PERF_RECORD_{!SAMPLE} events don't honour
 274                  * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
 275                  */
 276                 if (total_events == before && false)
 277                         poll(evlist->pollfd, evlist->nr_fds, -1);
 278
 279                 sleep(1);
 280                 if (++wakeups > 5) {
 281                         pr_debug("No PERF_RECORD_EXIT event!\n");
 282                         break;
 283                 }
 284         }
 285
 286 found_exit:
 287         if (nr_events[PERF_RECORD_COMM] > 1) {
 288                 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
 289                 ++errs;
 290         }
 291
 292         if (nr_events[PERF_RECORD_COMM] == 0) {
 293                 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
 294                 ++errs;
 295         }
 296
 297         if (!found_cmd_mmap) {
 298                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
 299                 ++errs;
 300         }
 301
 302         if (!found_libc_mmap) {
 303                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
 304                 ++errs;
 305         }
 306
 307         if (!found_ld_mmap) {
 308                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
 309                 ++errs;
 310         }
 311
 312         if (!found_vdso_mmap) {
 313                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
 314                 ++errs;
 315         }
 316 out_err:
 317         perf_evlist__munmap(evlist);
 318 out_close_evlist:
 319         perf_evlist__close(evlist);
 320 out_delete_maps:
 321         perf_evlist__delete_maps(evlist);
 322 out_delete_evlist:
 323         perf_evlist__delete(evlist);
 324 out:
 325         return (err < 0 || errs > 0) ? -1 : 0;
 326 }