LXR linux/tools/perf/tests/perf-record.c

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