tools/perf/tests/perf-record.c

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