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