tools/perf/tests/perf-record.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <inttypes.h>
   4 /* For the CLR_() macros */
   5 #include <pthread.h>
   6
   7 #include <sched.h>
   8 #include "evlist.h"
   9 #include "evsel.h"
  10 #include "perf.h"
  11 #include "debug.h"
  12 #include "tests.h"
  13
  14 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp)
  15 {
  16         int i, cpu = -1, nrcpus = 1024;
  17 realloc:
  18         CPU_ZERO(maskp);
  19
  20         if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) {
  21                 if (errno == EINVAL && nrcpus < (1024 << 8)) {
  22                         nrcpus = nrcpus << 2;
  23                         goto realloc;
  24                 }
  25                 perror("sched_getaffinity");
  26                         return -1;
  27         }
  28
  29         for (i = 0; i < nrcpus; i++) {
  30                 if (CPU_ISSET(i, maskp)) {
  31                         if (cpu == -1)
  32                                 cpu = i;
  33                         else
  34                                 CPU_CLR(i, maskp);
  35                 }
  36         }
  37
  38         return cpu;
  39 }
  40
  41 int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unused)
  42 {
  43         struct record_opts opts = {
  44                 .target = {
  45                         .uid = UINT_MAX,
  46                         .uses_mmap = true,
  47                 },
  48                 .no_buffering = true,
  49                 .mmap_pages   = 256,
  50         };
  51         cpu_set_t cpu_mask;
  52         size_t cpu_mask_size = sizeof(cpu_mask);
  53         struct perf_evlist *evlist = perf_evlist__new_dummy();
  54         struct perf_evsel *evsel;
  55         struct perf_sample sample;
  56         const char *cmd = "sleep";
  57         const char *argv[] = { cmd, "1", NULL, };
  58         char *bname, *mmap_filename;
  59         u64 prev_time = 0;
  60         bool found_cmd_mmap = false,
  61              found_libc_mmap = false,
  62              found_vdso_mmap = false,
  63              found_ld_mmap = false;
  64         int err = -1, errs = 0, i, wakeups = 0;
  65         u32 cpu;
  66         int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
  67         char sbuf[STRERR_BUFSIZE];
  68
  69         if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */
  70                 evlist = perf_evlist__new_default();
  71
  72         if (evlist == NULL) {
  73                 pr_debug("Not enough memory to create evlist\n");
  74                 goto out;
  75         }
  76
  77         /*
  78          * Create maps of threads and cpus to monitor. In this case
  79          * we start with all threads and cpus (-1, -1) but then in
  80          * perf_evlist__prepare_workload we'll fill in the only thread
  81          * we're monitoring, the one forked there.
  82          */
  83         err = perf_evlist__create_maps(evlist, &opts.target);
  84         if (err < 0) {
  85                 pr_debug("Not enough memory to create thread/cpu maps\n");
  86                 goto out_delete_evlist;
  87         }
  88
  89         /*
  90          * Prepare the workload in argv[] to run, it'll fork it, and then wait
  91          * for perf_evlist__start_workload() to exec it. This is done this way
  92          * so that we have time to open the evlist (calling sys_perf_event_open
  93          * on all the fds) and then mmap them.
  94          */
  95         err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL);
  96         if (err < 0) {
  97                 pr_debug("Couldn't run the workload!\n");
  98                 goto out_delete_evlist;
  99         }
 100
 101         /*
 102          * Config the evsels, setting attr->comm on the first one, etc.
 103          */
 104         evsel = perf_evlist__first(evlist);
 105         perf_evsel__set_sample_bit(evsel, CPU);
 106         perf_evsel__set_sample_bit(evsel, TID);
 107         perf_evsel__set_sample_bit(evsel, TIME);
 108         perf_evlist__config(evlist, &opts, NULL);
 109
 110         err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
 111         if (err < 0) {
 112                 pr_debug("sched__get_first_possible_cpu: %s\n",
 113                          str_error_r(errno, sbuf, sizeof(sbuf)));
 114                 goto out_delete_evlist;
 115         }
 116
 117         cpu = err;
 118
 119         /*
 120          * So that we can check perf_sample.cpu on all the samples.
 121          */
 122         if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
 123                 pr_debug("sched_setaffinity: %s\n",
 124                          str_error_r(errno, sbuf, sizeof(sbuf)));
 125                 goto out_delete_evlist;
 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",
 135                          str_error_r(errno, sbuf, sizeof(sbuf)));
 136                 goto out_delete_evlist;
 137         }
 138
 139         /*
 140          * mmap the first fd on a given CPU and ask for events for the other
 141          * fds in the same CPU to be injected in the same mmap ring buffer
 142          * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
 143          */
 144         err = perf_evlist__mmap(evlist, opts.mmap_pages);
 145         if (err < 0) {
 146                 pr_debug("perf_evlist__mmap: %s\n",
 147                          str_error_r(errno, sbuf, sizeof(sbuf)));
 148                 goto out_delete_evlist;
 149         }
 150
 151         /*
 152          * Now that all is properly set up, enable the events, they will
 153          * count just on workload.pid, which will start...
 154          */
 155         perf_evlist__enable(evlist);
 156
 157         /*
 158          * Now!
 159          */
 160         perf_evlist__start_workload(evlist);
 161
 162         while (1) {
 163                 int before = total_events;
 164
 165                 for (i = 0; i < evlist->nr_mmaps; i++) {
 166                         union perf_event *event;
 167
 168                         while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 169                                 const u32 type = event->header.type;
 170                                 const char *name = perf_event__name(type);
 171
 172                                 ++total_events;
 173                                 if (type < PERF_RECORD_MAX)
 174                                         nr_events[type]++;
 175
 176                                 err = perf_evlist__parse_sample(evlist, event, &sample);
 177                                 if (err < 0) {
 178                                         if (verbose > 0)
 179                                                 perf_event__fprintf(event, stderr);
 180                                         pr_debug("Couldn't parse sample\n");
 181                                         goto out_delete_evlist;
 182                                 }
 183
 184                                 if (verbose > 0) {
 185                                         pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
 186                                         perf_event__fprintf(event, stderr);
 187                                 }
 188
 189                                 if (prev_time > sample.time) {
 190                                         pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
 191                                                  name, prev_time, sample.time);
 192                                         ++errs;
 193                                 }
 194
 195                                 prev_time = sample.time;
 196
 197                                 if (sample.cpu != cpu) {
 198                                         pr_debug("%s with unexpected cpu, expected %d, got %d\n",
 199                                                  name, cpu, sample.cpu);
 200                                         ++errs;
 201                                 }
 202
 203                                 if ((pid_t)sample.pid != evlist->workload.pid) {
 204                                         pr_debug("%s with unexpected pid, expected %d, got %d\n",
 205                                                  name, evlist->workload.pid, sample.pid);
 206                                         ++errs;
 207                                 }
 208
 209                                 if ((pid_t)sample.tid != evlist->workload.pid) {
 210                                         pr_debug("%s with unexpected tid, expected %d, got %d\n",
 211                                                  name, evlist->workload.pid, sample.tid);
 212                                         ++errs;
 213                                 }
 214
 215                                 if ((type == PERF_RECORD_COMM ||
 216                                      type == PERF_RECORD_MMAP ||
 217                                      type == PERF_RECORD_MMAP2 ||
 218                                      type == PERF_RECORD_FORK ||
 219                                      type == PERF_RECORD_EXIT) &&
 220                                      (pid_t)event->comm.pid != evlist->workload.pid) {
 221                                         pr_debug("%s with unexpected pid/tid\n", name);
 222                                         ++errs;
 223                                 }
 224
 225                                 if ((type == PERF_RECORD_COMM ||
 226                                      type == PERF_RECORD_MMAP ||
 227                                      type == PERF_RECORD_MMAP2) &&
 228                                      event->comm.pid != event->comm.tid) {
 229                                         pr_debug("%s with different pid/tid!\n", name);
 230                                         ++errs;
 231                                 }
 232
 233                                 switch (type) {
 234                                 case PERF_RECORD_COMM:
 235                                         if (strcmp(event->comm.comm, cmd)) {
 236                                                 pr_debug("%s with unexpected comm!\n", name);
 237                                                 ++errs;
 238                                         }
 239                                         break;
 240                                 case PERF_RECORD_EXIT:
 241                                         goto found_exit;
 242                                 case PERF_RECORD_MMAP:
 243                                         mmap_filename = event->mmap.filename;
 244                                         goto check_bname;
 245                                 case PERF_RECORD_MMAP2:
 246                                         mmap_filename = event->mmap2.filename;
 247                                 check_bname:
 248                                         bname = strrchr(mmap_filename, '/');
 249                                         if (bname != NULL) {
 250                                                 if (!found_cmd_mmap)
 251                                                         found_cmd_mmap = !strcmp(bname + 1, cmd);
 252                                                 if (!found_libc_mmap)
 253                                                         found_libc_mmap = !strncmp(bname + 1, "libc", 4);
 254                                                 if (!found_ld_mmap)
 255                                                         found_ld_mmap = !strncmp(bname + 1, "ld", 2);
 256                                         } else if (!found_vdso_mmap)
 257                                                 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
 258                                         break;
 259
 260                                 case PERF_RECORD_SAMPLE:
 261                                         /* Just ignore samples for now */
 262                                         break;
 263                                 default:
 264                                         pr_debug("Unexpected perf_event->header.type %d!\n",
 265                                                  type);
 266                                         ++errs;
 267                                 }
 268
 269                                 perf_evlist__mmap_consume(evlist, i);
 270                         }
 271                 }
 272
 273                 /*
 274                  * We don't use poll here because at least at 3.1 times the
 275                  * PERF_RECORD_{!SAMPLE} events don't honour
 276                  * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
 277                  */
 278                 if (total_events == before && false)
 279                         perf_evlist__poll(evlist, -1);
 280
 281                 sleep(1);
 282                 if (++wakeups > 5) {
 283                         pr_debug("No PERF_RECORD_EXIT event!\n");
 284                         break;
 285                 }
 286         }
 287
 288 found_exit:
 289         if (nr_events[PERF_RECORD_COMM] > 1) {
 290                 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
 291                 ++errs;
 292         }
 293
 294         if (nr_events[PERF_RECORD_COMM] == 0) {
 295                 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
 296                 ++errs;
 297         }
 298
 299         if (!found_cmd_mmap) {
 300                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
 301                 ++errs;
 302         }
 303
 304         if (!found_libc_mmap) {
 305                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
 306                 ++errs;
 307         }
 308
 309         if (!found_ld_mmap) {
 310                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
 311                 ++errs;
 312         }
 313
 314         if (!found_vdso_mmap) {
 315                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
 316                 ++errs;
 317         }
 318 out_delete_evlist:
 319         perf_evlist__delete(evlist);
 320 out:
 321         return (err < 0 || errs > 0) ? -1 : 0;
 322 }