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_coreutils_mmap = false,
  62              found_libc_mmap = false,
  63              found_vdso_mmap = false,
  64              found_ld_mmap = false;
  65         int err = -1, errs = 0, i, wakeups = 0;
  66         u32 cpu;
  67         int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
  68         char sbuf[STRERR_BUFSIZE];
  69
  70         if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */
  71                 evlist = perf_evlist__new_default();
  72
  73         if (evlist == NULL) {
  74                 pr_debug("Not enough memory to create evlist\n");
  75                 goto out;
  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, false, NULL);
  97         if (err < 0) {
  98                 pr_debug("Couldn't run the workload!\n");
  99                 goto out_delete_evlist;
 100         }
 101
 102         /*
 103          * Config the evsels, setting attr->comm on the first one, etc.
 104          */
 105         evsel = perf_evlist__first(evlist);
 106         perf_evsel__set_sample_bit(evsel, CPU);
 107         perf_evsel__set_sample_bit(evsel, TID);
 108         perf_evsel__set_sample_bit(evsel, TIME);
 109         perf_evlist__config(evlist, &opts, NULL);
 110
 111         err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
 112         if (err < 0) {
 113                 pr_debug("sched__get_first_possible_cpu: %s\n",
 114                          str_error_r(errno, sbuf, sizeof(sbuf)));
 115                 goto out_delete_evlist;
 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",
 125                          str_error_r(errno, sbuf, sizeof(sbuf)));
 126                 goto out_delete_evlist;
 127         }
 128
 129         /*
 130          * Call sys_perf_event_open on all the fds on all the evsels,
 131          * grouping them if asked to.
 132          */
 133         err = perf_evlist__open(evlist);
 134         if (err < 0) {
 135                 pr_debug("perf_evlist__open: %s\n",
 136                          str_error_r(errno, sbuf, sizeof(sbuf)));
 137                 goto out_delete_evlist;
 138         }
 139
 140         /*
 141          * mmap the first fd on a given CPU and ask for events for the other
 142          * fds in the same CPU to be injected in the same mmap ring buffer
 143          * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
 144          */
 145         err = perf_evlist__mmap(evlist, opts.mmap_pages);
 146         if (err < 0) {
 147                 pr_debug("perf_evlist__mmap: %s\n",
 148                          str_error_r(errno, sbuf, sizeof(sbuf)));
 149                 goto out_delete_evlist;
 150         }
 151
 152         /*
 153          * Now that all is properly set up, enable the events, they will
 154          * count just on workload.pid, which will start...
 155          */
 156         perf_evlist__enable(evlist);
 157
 158         /*
 159          * Now!
 160          */
 161         perf_evlist__start_workload(evlist);
 162
 163         while (1) {
 164                 int before = total_events;
 165
 166                 for (i = 0; i < evlist->nr_mmaps; i++) {
 167                         union perf_event *event;
 168                         struct perf_mmap *md;
 169
 170                         md = &evlist->mmap[i];
 171                         if (perf_mmap__read_init(md) < 0)
 172                                 continue;
 173
 174                         while ((event = perf_mmap__read_event(md)) != NULL) {
 175                                 const u32 type = event->header.type;
 176                                 const char *name = perf_event__name(type);
 177
 178                                 ++total_events;
 179                                 if (type < PERF_RECORD_MAX)
 180                                         nr_events[type]++;
 181
 182                                 err = perf_evlist__parse_sample(evlist, event, &sample);
 183                                 if (err < 0) {
 184                                         if (verbose > 0)
 185                                                 perf_event__fprintf(event, stderr);
 186                                         pr_debug("Couldn't parse sample\n");
 187                                         goto out_delete_evlist;
 188                                 }
 189
 190                                 if (verbose > 0) {
 191                                         pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
 192                                         perf_event__fprintf(event, stderr);
 193                                 }
 194
 195                                 if (prev_time > sample.time) {
 196                                         pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
 197                                                  name, prev_time, sample.time);
 198                                         ++errs;
 199                                 }
 200
 201                                 prev_time = sample.time;
 202
 203                                 if (sample.cpu != cpu) {
 204                                         pr_debug("%s with unexpected cpu, expected %d, got %d\n",
 205                                                  name, cpu, sample.cpu);
 206                                         ++errs;
 207                                 }
 208
 209                                 if ((pid_t)sample.pid != evlist->workload.pid) {
 210                                         pr_debug("%s with unexpected pid, expected %d, got %d\n",
 211                                                  name, evlist->workload.pid, sample.pid);
 212                                         ++errs;
 213                                 }
 214
 215                                 if ((pid_t)sample.tid != evlist->workload.pid) {
 216                                         pr_debug("%s with unexpected tid, expected %d, got %d\n",
 217                                                  name, evlist->workload.pid, sample.tid);
 218                                         ++errs;
 219                                 }
 220
 221                                 if ((type == PERF_RECORD_COMM ||
 222                                      type == PERF_RECORD_MMAP ||
 223                                      type == PERF_RECORD_MMAP2 ||
 224                                      type == PERF_RECORD_FORK ||
 225                                      type == PERF_RECORD_EXIT) &&
 226                                      (pid_t)event->comm.pid != evlist->workload.pid) {
 227                                         pr_debug("%s with unexpected pid/tid\n", name);
 228                                         ++errs;
 229                                 }
 230
 231                                 if ((type == PERF_RECORD_COMM ||
 232                                      type == PERF_RECORD_MMAP ||
 233                                      type == PERF_RECORD_MMAP2) &&
 234                                      event->comm.pid != event->comm.tid) {
 235                                         pr_debug("%s with different pid/tid!\n", name);
 236                                         ++errs;
 237                                 }
 238
 239                                 switch (type) {
 240                                 case PERF_RECORD_COMM:
 241                                         if (strcmp(event->comm.comm, cmd)) {
 242                                                 pr_debug("%s with unexpected comm!\n", name);
 243                                                 ++errs;
 244                                         }
 245                                         break;
 246                                 case PERF_RECORD_EXIT:
 247                                         goto found_exit;
 248                                 case PERF_RECORD_MMAP:
 249                                         mmap_filename = event->mmap.filename;
 250                                         goto check_bname;
 251                                 case PERF_RECORD_MMAP2:
 252                                         mmap_filename = event->mmap2.filename;
 253                                 check_bname:
 254                                         bname = strrchr(mmap_filename, '/');
 255                                         if (bname != NULL) {
 256                                                 if (!found_cmd_mmap)
 257                                                         found_cmd_mmap = !strcmp(bname + 1, cmd);
 258                                                 if (!found_coreutils_mmap)
 259                                                         found_coreutils_mmap = !strcmp(bname + 1, "coreutils");
 260                                                 if (!found_libc_mmap)
 261                                                         found_libc_mmap = !strncmp(bname + 1, "libc", 4);
 262                                                 if (!found_ld_mmap)
 263                                                         found_ld_mmap = !strncmp(bname + 1, "ld", 2);
 264                                         } else if (!found_vdso_mmap)
 265                                                 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
 266                                         break;
 267
 268                                 case PERF_RECORD_SAMPLE:
 269                                         /* Just ignore samples for now */
 270                                         break;
 271                                 default:
 272                                         pr_debug("Unexpected perf_event->header.type %d!\n",
 273                                                  type);
 274                                         ++errs;
 275                                 }
 276
 277                                 perf_mmap__consume(md);
 278                         }
 279                         perf_mmap__read_done(md);
 280                 }
 281
 282                 /*
 283                  * We don't use poll here because at least at 3.1 times the
 284                  * PERF_RECORD_{!SAMPLE} events don't honour
 285                  * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
 286                  */
 287                 if (total_events == before && false)
 288                         perf_evlist__poll(evlist, -1);
 289
 290                 sleep(1);
 291                 if (++wakeups > 5) {
 292                         pr_debug("No PERF_RECORD_EXIT event!\n");
 293                         break;
 294                 }
 295         }
 296
 297 found_exit:
 298         if (nr_events[PERF_RECORD_COMM] > 1 + !!found_coreutils_mmap) {
 299                 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
 300                 ++errs;
 301         }
 302
 303         if (nr_events[PERF_RECORD_COMM] == 0) {
 304                 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
 305                 ++errs;
 306         }
 307
 308         if (!found_cmd_mmap && !found_coreutils_mmap) {
 309                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
 310                 ++errs;
 311         }
 312
 313         if (!found_libc_mmap) {
 314                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
 315                 ++errs;
 316         }
 317
 318         if (!found_ld_mmap) {
 319                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
 320                 ++errs;
 321         }
 322
 323         if (!found_vdso_mmap) {
 324                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
 325                 ++errs;
 326         }
 327 out_delete_evlist:
 328         perf_evlist__delete(evlist);
 329 out:
 330         return (err < 0 || errs > 0) ? -1 : 0;
 331 }