tools/perf/tests/perf-record.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <inttypes.h>
   4 #include <linux/string.h>
   5 /* For the CLR_() macros */
   6 #include <pthread.h>
   7
   8 #include <sched.h>
   9 #include "evlist.h"
  10 #include "evsel.h"
  11 #include "debug.h"
  12 #include "record.h"
  13 #include "tests.h"
  14
  15 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp)
  16 {
  17         int i, cpu = -1, nrcpus = 1024;
  18 realloc:
  19         CPU_ZERO(maskp);
  20
  21         if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) {
  22                 if (errno == EINVAL && nrcpus < (1024 << 8)) {
  23                         nrcpus = nrcpus << 2;
  24                         goto realloc;
  25                 }
  26                 perror("sched_getaffinity");
  27                         return -1;
  28         }
  29
  30         for (i = 0; i < nrcpus; i++) {
  31                 if (CPU_ISSET(i, maskp)) {
  32                         if (cpu == -1)
  33                                 cpu = i;
  34                         else
  35                                 CPU_CLR(i, maskp);
  36                 }
  37         }
  38
  39         return cpu;
  40 }
  41
  42 int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unused)
  43 {
  44         struct record_opts opts = {
  45                 .target = {
  46                         .uid = UINT_MAX,
  47                         .uses_mmap = true,
  48                 },
  49                 .no_buffering = true,
  50                 .mmap_pages   = 256,
  51         };
  52         cpu_set_t cpu_mask;
  53         size_t cpu_mask_size = sizeof(cpu_mask);
  54         struct evlist *evlist = perf_evlist__new_dummy();
  55         struct evsel *evsel;
  56         struct perf_sample sample;
  57         const char *cmd = "sleep";
  58         const char *argv[] = { cmd, "1", NULL, };
  59         char *bname, *mmap_filename;
  60         u64 prev_time = 0;
  61         bool found_cmd_mmap = false,
  62              found_coreutils_mmap = false,
  63              found_libc_mmap = false,
  64              found_vdso_mmap = false,
  65              found_ld_mmap = false;
  66         int err = -1, errs = 0, i, wakeups = 0;
  67         u32 cpu;
  68         int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
  69         char sbuf[STRERR_BUFSIZE];
  70
  71         if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */
  72                 evlist = perf_evlist__new_default();
  73
  74         if (evlist == NULL) {
  75                 pr_debug("Not enough memory to create evlist\n");
  76                 goto out;
  77         }
  78
  79         /*
  80          * Create maps of threads and cpus to monitor. In this case
  81          * we start with all threads and cpus (-1, -1) but then in
  82          * perf_evlist__prepare_workload we'll fill in the only thread
  83          * we're monitoring, the one forked there.
  84          */
  85         err = perf_evlist__create_maps(evlist, &opts.target);
  86         if (err < 0) {
  87                 pr_debug("Not enough memory to create thread/cpu maps\n");
  88                 goto out_delete_evlist;
  89         }
  90
  91         /*
  92          * Prepare the workload in argv[] to run, it'll fork it, and then wait
  93          * for perf_evlist__start_workload() to exec it. This is done this way
  94          * so that we have time to open the evlist (calling sys_perf_event_open
  95          * on all the fds) and then mmap them.
  96          */
  97         err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL);
  98         if (err < 0) {
  99                 pr_debug("Couldn't run the workload!\n");
 100                 goto out_delete_evlist;
 101         }
 102
 103         /*
 104          * Config the evsels, setting attr->comm on the first one, etc.
 105          */
 106         evsel = perf_evlist__first(evlist);
 107         perf_evsel__set_sample_bit(evsel, CPU);
 108         perf_evsel__set_sample_bit(evsel, TID);
 109         perf_evsel__set_sample_bit(evsel, TIME);
 110         perf_evlist__config(evlist, &opts, NULL);
 111
 112         err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
 113         if (err < 0) {
 114                 pr_debug("sched__get_first_possible_cpu: %s\n",
 115                          str_error_r(errno, sbuf, sizeof(sbuf)));
 116                 goto out_delete_evlist;
 117         }
 118
 119         cpu = err;
 120
 121         /*
 122          * So that we can check perf_sample.cpu on all the samples.
 123          */
 124         if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
 125                 pr_debug("sched_setaffinity: %s\n",
 126                          str_error_r(errno, sbuf, sizeof(sbuf)));
 127                 goto out_delete_evlist;
 128         }
 129
 130         /*
 131          * Call sys_perf_event_open on all the fds on all the evsels,
 132          * grouping them if asked to.
 133          */
 134         err = evlist__open(evlist);
 135         if (err < 0) {
 136                 pr_debug("perf_evlist__open: %s\n",
 137                          str_error_r(errno, sbuf, sizeof(sbuf)));
 138                 goto out_delete_evlist;
 139         }
 140
 141         /*
 142          * mmap the first fd on a given CPU and ask for events for the other
 143          * fds in the same CPU to be injected in the same mmap ring buffer
 144          * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
 145          */
 146         err = perf_evlist__mmap(evlist, opts.mmap_pages);
 147         if (err < 0) {
 148                 pr_debug("perf_evlist__mmap: %s\n",
 149                          str_error_r(errno, sbuf, sizeof(sbuf)));
 150                 goto out_delete_evlist;
 151         }
 152
 153         /*
 154          * Now that all is properly set up, enable the events, they will
 155          * count just on workload.pid, which will start...
 156          */
 157         evlist__enable(evlist);
 158
 159         /*
 160          * Now!
 161          */
 162         perf_evlist__start_workload(evlist);
 163
 164         while (1) {
 165                 int before = total_events;
 166
 167                 for (i = 0; i < evlist->nr_mmaps; i++) {
 168                         union perf_event *event;
 169                         struct mmap *md;
 170
 171                         md = &evlist->mmap[i];
 172                         if (perf_mmap__read_init(md) < 0)
 173                                 continue;
 174
 175                         while ((event = perf_mmap__read_event(md)) != NULL) {
 176                                 const u32 type = event->header.type;
 177                                 const char *name = perf_event__name(type);
 178
 179                                 ++total_events;
 180                                 if (type < PERF_RECORD_MAX)
 181                                         nr_events[type]++;
 182
 183                                 err = perf_evlist__parse_sample(evlist, event, &sample);
 184                                 if (err < 0) {
 185                                         if (verbose > 0)
 186                                                 perf_event__fprintf(event, stderr);
 187                                         pr_debug("Couldn't parse sample\n");
 188                                         goto out_delete_evlist;
 189                                 }
 190
 191                                 if (verbose > 0) {
 192                                         pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
 193                                         perf_event__fprintf(event, stderr);
 194                                 }
 195
 196                                 if (prev_time > sample.time) {
 197                                         pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
 198                                                  name, prev_time, sample.time);
 199                                         ++errs;
 200                                 }
 201
 202                                 prev_time = sample.time;
 203
 204                                 if (sample.cpu != cpu) {
 205                                         pr_debug("%s with unexpected cpu, expected %d, got %d\n",
 206                                                  name, cpu, sample.cpu);
 207                                         ++errs;
 208                                 }
 209
 210                                 if ((pid_t)sample.pid != evlist->workload.pid) {
 211                                         pr_debug("%s with unexpected pid, expected %d, got %d\n",
 212                                                  name, evlist->workload.pid, sample.pid);
 213                                         ++errs;
 214                                 }
 215
 216                                 if ((pid_t)sample.tid != evlist->workload.pid) {
 217                                         pr_debug("%s with unexpected tid, expected %d, got %d\n",
 218                                                  name, evlist->workload.pid, sample.tid);
 219                                         ++errs;
 220                                 }
 221
 222                                 if ((type == PERF_RECORD_COMM ||
 223                                      type == PERF_RECORD_MMAP ||
 224                                      type == PERF_RECORD_MMAP2 ||
 225                                      type == PERF_RECORD_FORK ||
 226                                      type == PERF_RECORD_EXIT) &&
 227                                      (pid_t)event->comm.pid != evlist->workload.pid) {
 228                                         pr_debug("%s with unexpected pid/tid\n", name);
 229                                         ++errs;
 230                                 }
 231
 232                                 if ((type == PERF_RECORD_COMM ||
 233                                      type == PERF_RECORD_MMAP ||
 234                                      type == PERF_RECORD_MMAP2) &&
 235                                      event->comm.pid != event->comm.tid) {
 236                                         pr_debug("%s with different pid/tid!\n", name);
 237                                         ++errs;
 238                                 }
 239
 240                                 switch (type) {
 241                                 case PERF_RECORD_COMM:
 242                                         if (strcmp(event->comm.comm, cmd)) {
 243                                                 pr_debug("%s with unexpected comm!\n", name);
 244                                                 ++errs;
 245                                         }
 246                                         break;
 247                                 case PERF_RECORD_EXIT:
 248                                         goto found_exit;
 249                                 case PERF_RECORD_MMAP:
 250                                         mmap_filename = event->mmap.filename;
 251                                         goto check_bname;
 252                                 case PERF_RECORD_MMAP2:
 253                                         mmap_filename = event->mmap2.filename;
 254                                 check_bname:
 255                                         bname = strrchr(mmap_filename, '/');
 256                                         if (bname != NULL) {
 257                                                 if (!found_cmd_mmap)
 258                                                         found_cmd_mmap = !strcmp(bname + 1, cmd);
 259                                                 if (!found_coreutils_mmap)
 260                                                         found_coreutils_mmap = !strcmp(bname + 1, "coreutils");
 261                                                 if (!found_libc_mmap)
 262                                                         found_libc_mmap = !strncmp(bname + 1, "libc", 4);
 263                                                 if (!found_ld_mmap)
 264                                                         found_ld_mmap = !strncmp(bname + 1, "ld", 2);
 265                                         } else if (!found_vdso_mmap)
 266                                                 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
 267                                         break;
 268
 269                                 case PERF_RECORD_SAMPLE:
 270                                         /* Just ignore samples for now */
 271                                         break;
 272                                 default:
 273                                         pr_debug("Unexpected perf_event->header.type %d!\n",
 274                                                  type);
 275                                         ++errs;
 276                                 }
 277
 278                                 perf_mmap__consume(md);
 279                         }
 280                         perf_mmap__read_done(md);
 281                 }
 282
 283                 /*
 284                  * We don't use poll here because at least at 3.1 times the
 285                  * PERF_RECORD_{!SAMPLE} events don't honour
 286                  * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
 287                  */
 288                 if (total_events == before && false)
 289                         perf_evlist__poll(evlist, -1);
 290
 291                 sleep(1);
 292                 if (++wakeups > 5) {
 293                         pr_debug("No PERF_RECORD_EXIT event!\n");
 294                         break;
 295                 }
 296         }
 297
 298 found_exit:
 299         if (nr_events[PERF_RECORD_COMM] > 1 + !!found_coreutils_mmap) {
 300                 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
 301                 ++errs;
 302         }
 303
 304         if (nr_events[PERF_RECORD_COMM] == 0) {
 305                 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
 306                 ++errs;
 307         }
 308
 309         if (!found_cmd_mmap && !found_coreutils_mmap) {
 310                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
 311                 ++errs;
 312         }
 313
 314         if (!found_libc_mmap) {
 315                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
 316                 ++errs;
 317         }
 318
 319         if (!found_ld_mmap) {
 320                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
 321                 ++errs;
 322         }
 323
 324         if (!found_vdso_mmap) {
 325                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
 326                 ++errs;
 327         }
 328 out_delete_evlist:
 329         evlist__delete(evlist);
 330 out:
 331         return (err < 0 || errs > 0) ? -1 : 0;
 332 }