tools/perf/util/data_map.c

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