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 perf_record_opts opts = {
  38                .target = {
  39                        .uid = UINT_MAX,
  40                        .uses_mmap = true,
  41                },
  42                .no_delay   = 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();
  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;
  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
  63        if (evlist == NULL || argv == NULL) {
  64                pr_debug("Not enough memory to create evlist\n");
  65                goto out;
  66        }
  67
  68        /*
  69         * We need at least one evsel in the evlist, use the default
  70         * one: "cycles".
  71         */
  72        err = perf_evlist__add_default(evlist);
  73        if (err < 0) {
  74                pr_debug("Not enough memory to create evsel\n");
  75                goto out_delete_evlist;
  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,
  97                                            false, false);
  98        if (err < 0) {
  99                pr_debug("Couldn't run the workload!\n");
 100                goto out_delete_maps;
 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);
 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", strerror(errno));
 115                goto out_delete_maps;
 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", strerror(errno));
 125                goto out_delete_maps;
 126        }
 127
 128        /*
 129         * Call sys_perf_event_open on all the fds on all the evsels,
 130         * grouping them if asked to.
 131         */
 132        err = perf_evlist__open(evlist);
 133        if (err < 0) {
 134                pr_debug("perf_evlist__open: %s\n", strerror(errno));
 135                goto out_delete_maps;
 136        }
 137
 138        /*
 139         * mmap the first fd on a given CPU and ask for events for the other
 140         * fds in the same CPU to be injected in the same mmap ring buffer
 141         * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
 142         */
 143        err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
 144        if (err < 0) {
 145                pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
 146                goto out_close_evlist;
 147        }
 148
 149        /*
 150         * Now that all is properly set up, enable the events, they will
 151         * count just on workload.pid, which will start...
 152         */
 153        perf_evlist__enable(evlist);
 154
 155        /*
 156         * Now!
 157         */
 158        perf_evlist__start_workload(evlist);
 159
 160        while (1) {
 161                int before = total_events;
 162
 163                for (i = 0; i < evlist->nr_mmaps; i++) {
 164                        union perf_event *event;
 165
 166                        while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 167                                const u32 type = event->header.type;
 168                                const char *name = perf_event__name(type);
 169
 170                                ++total_events;
 171                                if (type < PERF_RECORD_MAX)
 172                                        nr_events[type]++;
 173
 174                                err = perf_evlist__parse_sample(evlist, event, &sample);
 175                                if (err < 0) {
 176                                        if (verbose)
 177                                                perf_event__fprintf(event, stderr);
 178                                        pr_debug("Couldn't parse sample\n");
 179                                        goto out_err;
 180                                }
 181
 182                                if (verbose) {
 183                                        pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
 184                                        perf_event__fprintf(event, stderr);
 185                                }
 186
 187                                if (prev_time > sample.time) {
 188                                        pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
 189                                                 name, prev_time, sample.time);
 190                                        ++errs;
 191                                }
 192
 193                                prev_time = sample.time;
 194
 195                                if (sample.cpu != cpu) {
 196                                        pr_debug("%s with unexpected cpu, expected %d, got %d\n",
 197                                                 name, cpu, sample.cpu);
 198                                        ++errs;
 199                                }
 200
 201                                if ((pid_t)sample.pid != evlist->workload.pid) {
 202                                        pr_debug("%s with unexpected pid, expected %d, got %d\n",
 203                                                 name, evlist->workload.pid, sample.pid);
 204                                        ++errs;
 205                                }
 206
 207                                if ((pid_t)sample.tid != evlist->workload.pid) {
 208                                        pr_debug("%s with unexpected tid, expected %d, got %d\n",
 209                                                 name, evlist->workload.pid, sample.tid);
 210                                        ++errs;
 211                                }
 212
 213                                if ((type == PERF_RECORD_COMM ||
 214                                     type == PERF_RECORD_MMAP ||
 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                                     event->comm.pid != event->comm.tid) {
 225                                        pr_debug("%s with different pid/tid!\n", name);
 226                                        ++errs;
 227                                }
 228
 229                                switch (type) {
 230                                case PERF_RECORD_COMM:
 231                                        if (strcmp(event->comm.comm, cmd)) {
 232                                                pr_debug("%s with unexpected comm!\n", name);
 233                                                ++errs;
 234                                        }
 235                                        break;
 236                                case PERF_RECORD_EXIT:
 237                                        goto found_exit;
 238                                case PERF_RECORD_MMAP:
 239                                        bname = strrchr(event->mmap.filename, '/');
 240                                        if (bname != NULL) {
 241                                                if (!found_cmd_mmap)
 242                                                        found_cmd_mmap = !strcmp(bname + 1, cmd);
 243                                                if (!found_libc_mmap)
 244                                                        found_libc_mmap = !strncmp(bname + 1, "libc", 4);
 245                                                if (!found_ld_mmap)
 246                                                        found_ld_mmap = !strncmp(bname + 1, "ld", 2);
 247                                        } else if (!found_vdso_mmap)
 248                                                found_vdso_mmap = !strcmp(event->mmap.filename, "[vdso]");
 249                                        break;
 250
 251                                case PERF_RECORD_SAMPLE:
 252                                        /* Just ignore samples for now */
 253                                        break;
 254                                default:
 255                                        pr_debug("Unexpected perf_event->header.type %d!\n",
 256                                                 type);
 257                                        ++errs;
 258                                }
 259                        }
 260                }
 261
 262                /*
 263                 * We don't use poll here because at least at 3.1 times the
 264                 * PERF_RECORD_{!SAMPLE} events don't honour
 265                 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
 266                 */
 267                if (total_events == before && false)
 268                        poll(evlist->pollfd, evlist->nr_fds, -1);
 269
 270                sleep(1);
 271                if (++wakeups > 5) {
 272                        pr_debug("No PERF_RECORD_EXIT event!\n");
 273                        break;
 274                }
 275        }
 276
 277found_exit:
 278        if (nr_events[PERF_RECORD_COMM] > 1) {
 279                pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
 280                ++errs;
 281        }
 282
 283        if (nr_events[PERF_RECORD_COMM] == 0) {
 284                pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
 285                ++errs;
 286        }
 287
 288        if (!found_cmd_mmap) {
 289                pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
 290                ++errs;
 291        }
 292
 293        if (!found_libc_mmap) {
 294                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
 295                ++errs;
 296        }
 297
 298        if (!found_ld_mmap) {
 299                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
 300                ++errs;
 301        }
 302
 303        if (!found_vdso_mmap) {
 304                pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
 305                ++errs;
 306        }
 307out_err:
 308        perf_evlist__munmap(evlist);
 309out_close_evlist:
 310        perf_evlist__close(evlist);
 311out_delete_maps:
 312        perf_evlist__delete_maps(evlist);
 313out_delete_evlist:
 314        perf_evlist__delete(evlist);
 315out:
 316        return (err < 0 || errs > 0) ? -1 : 0;
 317}
 318