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