LXR linux/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 <perf/mmap.h>
  10#include "evlist.h"
  11#include "evsel.h"
  12#include "debug.h"
  13#include "record.h"
  14#include "tests.h"
  15#include "util/mmap.h"
  16
  17static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp)
  18{
  19        int i, cpu = -1, nrcpus = 1024;
  20realloc:
  21        CPU_ZERO(maskp);
  22
  23        if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) {
  24                if (errno == EINVAL && nrcpus < (1024 << 8)) {
  25                        nrcpus = nrcpus << 2;
  26                        goto realloc;
  27                }
  28                perror("sched_getaffinity");
  29                        return -1;
  30        }
  31
  32        for (i = 0; i < nrcpus; i++) {
  33                if (CPU_ISSET(i, maskp)) {
  34                        if (cpu == -1)
  35                                cpu = i;
  36                        else
  37                                CPU_CLR(i, maskp);
  38                }
  39        }
  40
  41        return cpu;
  42}
  43
  44int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unused)
  45{
  46        struct record_opts opts = {
  47                .target = {
  48                        .uid = UINT_MAX,
  49                        .uses_mmap = true,
  50                },
  51                .no_buffering = true,
  52                .mmap_pages   = 256,
  53        };
  54        cpu_set_t cpu_mask;
  55        size_t cpu_mask_size = sizeof(cpu_mask);
  56        struct evlist *evlist = evlist__new_dummy();
  57        struct evsel *evsel;
  58        struct perf_sample sample;
  59        const char *cmd = "sleep";
  60        const char *argv[] = { cmd, "1", NULL, };
  61        char *bname, *mmap_filename;
  62        u64 prev_time = 0;
  63        bool found_cmd_mmap = false,
  64             found_coreutils_mmap = false,
  65             found_libc_mmap = false,
  66             found_vdso_mmap = false,
  67             found_ld_mmap = false;
  68        int err = -1, errs = 0, i, wakeups = 0;
  69        u32 cpu;
  70        int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
  71        char sbuf[STRERR_BUFSIZE];
  72
  73        if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */
  74                evlist = evlist__new_default();
  75
  76        if (evlist == NULL) {
  77                pr_debug("Not enough memory to create evlist\n");
  78                goto out;
  79        }
  80
  81        /*
  82         * Create maps of threads and cpus to monitor. In this case
  83         * we start with all threads and cpus (-1, -1) but then in
  84         * evlist__prepare_workload we'll fill in the only thread
  85         * we're monitoring, the one forked there.
  86         */
  87        err = evlist__create_maps(evlist, &opts.target);
  88        if (err < 0) {
  89                pr_debug("Not enough memory to create thread/cpu maps\n");
  90                goto out_delete_evlist;
  91        }
  92
  93        /*
  94         * Prepare the workload in argv[] to run, it'll fork it, and then wait
  95         * for evlist__start_workload() to exec it. This is done this way
  96         * so that we have time to open the evlist (calling sys_perf_event_open
  97         * on all the fds) and then mmap them.
  98         */
  99        err = evlist__prepare_workload(evlist, &opts.target, argv, false, NULL);
 100        if (err < 0) {
 101                pr_debug("Couldn't run the workload!\n");
 102                goto out_delete_evlist;
 103        }
 104
 105        /*
 106         * Config the evsels, setting attr->comm on the first one, etc.
 107         */
 108        evsel = evlist__first(evlist);
 109        evsel__set_sample_bit(evsel, CPU);
 110        evsel__set_sample_bit(evsel, TID);
 111        evsel__set_sample_bit(evsel, TIME);
 112        evlist__config(evlist, &opts, NULL);
 113
 114        err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
 115        if (err < 0) {
 116                pr_debug("sched__get_first_possible_cpu: %s\n",
 117                         str_error_r(errno, sbuf, sizeof(sbuf)));
 118                goto out_delete_evlist;
 119        }
 120
 121        cpu = err;
 122
 123        /*
 124         * So that we can check perf_sample.cpu on all the samples.
 125         */
 126        if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
 127                pr_debug("sched_setaffinity: %s\n",
 128                         str_error_r(errno, sbuf, sizeof(sbuf)));
 129                goto out_delete_evlist;
 130        }
 131
 132        /*
 133         * Call sys_perf_event_open on all the fds on all the evsels,
 134         * grouping them if asked to.
 135         */
 136        err = evlist__open(evlist);
 137        if (err < 0) {
 138                pr_debug("perf_evlist__open: %s\n",
 139                         str_error_r(errno, sbuf, sizeof(sbuf)));
 140                goto out_delete_evlist;
 141        }
 142
 143        /*
 144         * mmap the first fd on a given CPU and ask for events for the other
 145         * fds in the same CPU to be injected in the same mmap ring buffer
 146         * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
 147         */
 148        err = evlist__mmap(evlist, opts.mmap_pages);
 149        if (err < 0) {
 150                pr_debug("evlist__mmap: %s\n",
 151                         str_error_r(errno, sbuf, sizeof(sbuf)));
 152                goto out_delete_evlist;
 153        }
 154
 155        /*
 156         * Now that all is properly set up, enable the events, they will
 157         * count just on workload.pid, which will start...
 158         */
 159        evlist__enable(evlist);
 160
 161        /*
 162         * Now!
 163         */
 164        evlist__start_workload(evlist);
 165
 166        while (1) {
 167                int before = total_events;
 168
 169                for (i = 0; i < evlist->core.nr_mmaps; i++) {
 170                        union perf_event *event;
 171                        struct mmap *md;
 172
 173                        md = &evlist->mmap[i];
 174                        if (perf_mmap__read_init(&md->core) < 0)
 175                                continue;
 176
 177                        while ((event = perf_mmap__read_event(&md->core)) != NULL) {
 178                                const u32 type = event->header.type;
 179                                const char *name = perf_event__name(type);
 180
 181                                ++total_events;
 182                                if (type < PERF_RECORD_MAX)
 183                                        nr_events[type]++;
 184
 185                                err = evlist__parse_sample(evlist, event, &sample);
 186                                if (err < 0) {
 187                                        if (verbose > 0)
 188                                                perf_event__fprintf(event, NULL, stderr);
 189                                        pr_debug("Couldn't parse sample\n");
 190                                        goto out_delete_evlist;
 191                                }
 192
 193                                if (verbose > 0) {
 194                                        pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
 195                                        perf_event__fprintf(event, NULL, stderr);
 196                                }
 197
 198                                if (prev_time > sample.time) {
 199                                        pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
 200                                                 name, prev_time, sample.time);
 201                                        ++errs;
 202                                }
 203
 204                                prev_time = sample.time;
 205
 206                                if (sample.cpu != cpu) {
 207                                        pr_debug("%s with unexpected cpu, expected %d, got %d\n",
 208                                                 name, cpu, sample.cpu);
 209                                        ++errs;
 210                                }
 211
 212                                if ((pid_t)sample.pid != evlist->workload.pid) {
 213                                        pr_debug("%s with unexpected pid, expected %d, got %d\n",
 214                                                 name, evlist->workload.pid, sample.pid);
 215                                        ++errs;
 216                                }
 217
 218                                if ((pid_t)sample.tid != evlist->workload.pid) {
 219                                        pr_debug("%s with unexpected tid, expected %d, got %d\n",
 220                                                 name, evlist->workload.pid, sample.tid);
 221                                        ++errs;
 222                                }
 223
 224                                if ((type == PERF_RECORD_COMM ||
 225                                     type == PERF_RECORD_MMAP ||
 226                                     type == PERF_RECORD_MMAP2 ||
 227                                     type == PERF_RECORD_FORK ||
 228                                     type == PERF_RECORD_EXIT) &&
 229                                     (pid_t)event->comm.pid != evlist->workload.pid) {
 230                                        pr_debug("%s with unexpected pid/tid\n", name);
 231                                        ++errs;
 232                                }
 233
 234                                if ((type == PERF_RECORD_COMM ||
 235                                     type == PERF_RECORD_MMAP ||
 236                                     type == PERF_RECORD_MMAP2) &&
 237                                     event->comm.pid != event->comm.tid) {
 238                                        pr_debug("%s with different pid/tid!\n", name);
 239                                        ++errs;
 240                                }
 241
 242                                switch (type) {
 243                                case PERF_RECORD_COMM:
 244                                        if (strcmp(event->comm.comm, cmd)) {
 245                                                pr_debug("%s with unexpected comm!\n", name);
 246                                                ++errs;
 247                                        }
 248                                        break;
 249                                case PERF_RECORD_EXIT:
 250                                        goto found_exit;
 251                                case PERF_RECORD_MMAP:
 252                                        mmap_filename = event->mmap.filename;
 253                                        goto check_bname;
 254                                case PERF_RECORD_MMAP2:
 255                                        mmap_filename = event->mmap2.filename;
 256                                check_bname:
 257                                        bname = strrchr(mmap_filename, '/');
 258                                        if (bname != NULL) {
 259                                                if (!found_cmd_mmap)
 260                                                        found_cmd_mmap = !strcmp(bname + 1, cmd);
 261                                                if (!found_coreutils_mmap)
 262                                                        found_coreutils_mmap = !strcmp(bname + 1, "coreutils");
 263                                                if (!found_libc_mmap)
 264                                                        found_libc_mmap = !strncmp(bname + 1, "libc", 4);
 265                                                if (!found_ld_mmap)
 266                                                        found_ld_mmap = !strncmp(bname + 1, "ld", 2);
 267                                        } else if (!found_vdso_mmap)
 268                                                found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
 269                                        break;
 270
 271                                case PERF_RECORD_SAMPLE:
 272                                        /* Just ignore samples for now */
 273                                        break;
 274                                default:
 275                                        pr_debug("Unexpected perf_event->header.type %d!\n",
 276                                                 type);
 277                                        ++errs;
 278                                }
 279
 280                                perf_mmap__consume(&md->core);
 281                        }
 282                        perf_mmap__read_done(&md->core);
 283                }
 284
 285                /*
 286                 * We don't use poll here because at least at 3.1 times the
 287                 * PERF_RECORD_{!SAMPLE} events don't honour
 288                 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
 289                 */
 290                if (total_events == before && false)
 291                        evlist__poll(evlist, -1);
 292
 293                sleep(1);
 294                if (++wakeups > 5) {
 295                        pr_debug("No PERF_RECORD_EXIT event!\n");
 296                        break;
 297                }
 298        }
 299
 300found_exit:
 301        if (nr_events[PERF_RECORD_COMM] > 1 + !!found_coreutils_mmap) {
 302                pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
 303                ++errs;
 304        }
 305
 306        if (nr_events[PERF_RECORD_COMM] == 0) {
 307                pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
 308                ++errs;
 309        }
 310
 311        if (!found_cmd_mmap && !found_coreutils_mmap) {
 312                pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
 313                ++errs;
 314        }
 315
 316        if (!found_libc_mmap) {
 317                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
 318                ++errs;
 319        }
 320
 321        if (!found_ld_mmap) {
 322                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
 323                ++errs;
 324        }
 325
 326        if (!found_vdso_mmap) {
 327                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
 328                ++errs;
 329        }
 330out_delete_evlist:
 331        evlist__delete(evlist);
 332out:
 333        return (err < 0 || errs > 0) ? -1 : 0;
 334}
 335