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

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