tools/perf/util/data_map.c

   1 #include "symbol.h"
   2 #include "util.h"
   3 #include "debug.h"
   4 #include "thread.h"
   5 #include "session.h"
   6
   7 static int process_event_stub(event_t *event __used,
   8                               struct perf_session *session __used)
   9 {
  10         dump_printf(": unhandled!\n");
  11         return 0;
  12 }
  13
  14 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
  15 {
  16         if (!handler->process_sample_event)
  17                 handler->process_sample_event = process_event_stub;
  18         if (!handler->process_mmap_event)
  19                 handler->process_mmap_event = process_event_stub;
  20         if (!handler->process_comm_event)
  21                 handler->process_comm_event = process_event_stub;
  22         if (!handler->process_fork_event)
  23                 handler->process_fork_event = process_event_stub;
  24         if (!handler->process_exit_event)
  25                 handler->process_exit_event = process_event_stub;
  26         if (!handler->process_lost_event)
  27                 handler->process_lost_event = process_event_stub;
  28         if (!handler->process_read_event)
  29                 handler->process_read_event = process_event_stub;
  30         if (!handler->process_throttle_event)
  31                 handler->process_throttle_event = process_event_stub;
  32         if (!handler->process_unthrottle_event)
  33                 handler->process_unthrottle_event = process_event_stub;
  34 }
  35
  36 static const char *event__name[] = {
  37         [0]                      = "TOTAL",
  38         [PERF_RECORD_MMAP]       = "MMAP",
  39         [PERF_RECORD_LOST]       = "LOST",
  40         [PERF_RECORD_COMM]       = "COMM",
  41         [PERF_RECORD_EXIT]       = "EXIT",
  42         [PERF_RECORD_THROTTLE]   = "THROTTLE",
  43         [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
  44         [PERF_RECORD_FORK]       = "FORK",
  45         [PERF_RECORD_READ]       = "READ",
  46         [PERF_RECORD_SAMPLE]     = "SAMPLE",
  47 };
  48
  49 unsigned long event__total[PERF_RECORD_MAX];
  50
  51 void event__print_totals(void)
  52 {
  53         int i;
  54         for (i = 0; i < PERF_RECORD_MAX; ++i)
  55                 pr_info("%10s events: %10ld\n",
  56                         event__name[i], event__total[i]);
  57 }
  58
  59 static int process_event(event_t *event, struct perf_session *session,
  60                          struct perf_event_ops *ops,
  61                          unsigned long offset, unsigned long head)
  62 {
  63         trace_event(event);
  64
  65         if (event->header.type < PERF_RECORD_MAX) {
  66                 dump_printf("%p [%p]: PERF_RECORD_%s",
  67                             (void *)(offset + head),
  68                             (void *)(long)(event->header.size),
  69                             event__name[event->header.type]);
  70                 ++event__total[0];
  71                 ++event__total[event->header.type];
  72         }
  73
  74         switch (event->header.type) {
  75         case PERF_RECORD_SAMPLE:
  76                 return ops->process_sample_event(event, session);
  77         case PERF_RECORD_MMAP:
  78                 return ops->process_mmap_event(event, session);
  79         case PERF_RECORD_COMM:
  80                 return ops->process_comm_event(event, session);
  81         case PERF_RECORD_FORK:
  82                 return ops->process_fork_event(event, session);
  83         case PERF_RECORD_EXIT:
  84                 return ops->process_exit_event(event, session);
  85         case PERF_RECORD_LOST:
  86                 return ops->process_lost_event(event, session);
  87         case PERF_RECORD_READ:
  88                 return ops->process_read_event(event, session);
  89         case PERF_RECORD_THROTTLE:
  90                 return ops->process_throttle_event(event, session);
  91         case PERF_RECORD_UNTHROTTLE:
  92                 return ops->process_unthrottle_event(event, session);
  93         default:
  94                 ops->total_unknown++;
  95                 return -1;
  96         }
  97 }
  98
  99 int perf_header__read_build_ids(int input, u64 offset, u64 size)
 100 {
 101         struct build_id_event bev;
 102         char filename[PATH_MAX];
 103         u64 limit = offset + size;
 104         int err = -1;
 105
 106         while (offset < limit) {
 107                 struct dso *dso;
 108                 ssize_t len;
 109
 110                 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
 111                         goto out;
 112
 113                 len = bev.header.size - sizeof(bev);
 114                 if (read(input, filename, len) != len)
 115                         goto out;
 116
 117                 dso = dsos__findnew(filename);
 118                 if (dso != NULL)
 119                         dso__set_build_id(dso, &bev.build_id);
 120
 121                 offset += bev.header.size;
 122         }
 123         err = 0;
 124 out:
 125         return err;
 126 }
 127
 128 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
 129 {
 130         struct thread *thread = perf_session__findnew(self, 0);
 131
 132         if (!thread || thread__set_comm(thread, "swapper")) {
 133                 pr_err("problem inserting idle task.\n");
 134                 thread = NULL;
 135         }
 136
 137         return thread;
 138 }
 139
 140 int perf_session__process_events(struct perf_session *self,
 141                                  struct perf_event_ops *ops)
 142 {
 143         int err;
 144         unsigned long head, shift;
 145         unsigned long offset = 0;
 146         size_t  page_size;
 147         event_t *event;
 148         uint32_t size;
 149         char *buf;
 150
 151         if (perf_session__register_idle_thread(self) == NULL)
 152                 return -ENOMEM;
 153
 154         perf_event_ops__fill_defaults(ops);
 155
 156         page_size = getpagesize();
 157
 158         head = self->header.data_offset;
 159         self->sample_type = perf_header__sample_type(&self->header);
 160
 161         err = -EINVAL;
 162         if (ops->sample_type_check && ops->sample_type_check(self) < 0)
 163                 goto out_err;
 164
 165         if (!ops->full_paths) {
 166                 char bf[PATH_MAX];
 167
 168                 if (getcwd(bf, sizeof(bf)) == NULL) {
 169                         err = -errno;
 170 out_getcwd_err:
 171                         pr_err("failed to get the current directory\n");
 172                         goto out_err;
 173                 }
 174                 self->cwd = strdup(bf);
 175                 if (self->cwd == NULL) {
 176                         err = -ENOMEM;
 177                         goto out_getcwd_err;
 178                 }
 179                 self->cwdlen = strlen(self->cwd);
 180         }
 181
 182         shift = page_size * (head / page_size);
 183         offset += shift;
 184         head -= shift;
 185
 186 remap:
 187         buf = mmap(NULL, page_size * self->mmap_window, PROT_READ,
 188                    MAP_SHARED, self->fd, offset);
 189         if (buf == MAP_FAILED) {
 190                 pr_err("failed to mmap file\n");
 191                 err = -errno;
 192                 goto out_err;
 193         }
 194
 195 more:
 196         event = (event_t *)(buf + head);
 197
 198         size = event->header.size;
 199         if (!size)
 200                 size = 8;
 201
 202         if (head + event->header.size >= page_size * self->mmap_window) {
 203                 int munmap_ret;
 204
 205                 shift = page_size * (head / page_size);
 206
 207                 munmap_ret = munmap(buf, page_size * self->mmap_window);
 208                 assert(munmap_ret == 0);
 209
 210                 offset += shift;
 211                 head -= shift;
 212                 goto remap;
 213         }
 214
 215         size = event->header.size;
 216
 217         dump_printf("\n%p [%p]: event: %d\n",
 218                         (void *)(offset + head),
 219                         (void *)(long)event->header.size,
 220                         event->header.type);
 221
 222         if (!size || process_event(event, self, ops, offset, head) < 0) {
 223
 224                 dump_printf("%p [%p]: skipping unknown header type: %d\n",
 225                         (void *)(offset + head),
 226                         (void *)(long)(event->header.size),
 227                         event->header.type);
 228
 229                 /*
 230                  * assume we lost track of the stream, check alignment, and
 231                  * increment a single u64 in the hope to catch on again 'soon'.
 232                  */
 233
 234                 if (unlikely(head & 7))
 235                         head &= ~7ULL;
 236
 237                 size = 8;
 238         }
 239
 240         head += size;
 241
 242         if (offset + head >= self->header.data_offset + self->header.data_size)
 243                 goto done;
 244
 245         if (offset + head < self->size)
 246                 goto more;
 247
 248 done:
 249         err = 0;
 250 out_err:
 251         return err;
 252 }