Pileus Git - ~andy/linux/blob - tools/perf/util/data_map.c

   1 #include "data_map.h"
   2 #include "symbol.h"
   3 #include "util.h"
   4 #include "debug.h"
   5
   6
   7 static struct perf_file_handler *curr_handler;
   8 static unsigned long    mmap_window = 32;
   9 static char             __cwd[PATH_MAX];
  10
  11 static int
  12 process_event_stub(event_t *event __used,
  13                    unsigned long offset __used,
  14                    unsigned long head __used)
  15 {
  16         return 0;
  17 }
  18
  19 void register_perf_file_handler(struct perf_file_handler *handler)
  20 {
  21         if (!handler->process_sample_event)
  22                 handler->process_sample_event = process_event_stub;
  23         if (!handler->process_mmap_event)
  24                 handler->process_mmap_event = process_event_stub;
  25         if (!handler->process_comm_event)
  26                 handler->process_comm_event = process_event_stub;
  27         if (!handler->process_fork_event)
  28                 handler->process_fork_event = process_event_stub;
  29         if (!handler->process_exit_event)
  30                 handler->process_exit_event = process_event_stub;
  31         if (!handler->process_lost_event)
  32                 handler->process_lost_event = process_event_stub;
  33         if (!handler->process_read_event)
  34                 handler->process_read_event = process_event_stub;
  35         if (!handler->process_throttle_event)
  36                 handler->process_throttle_event = process_event_stub;
  37         if (!handler->process_unthrottle_event)
  38                 handler->process_unthrottle_event = process_event_stub;
  39
  40         curr_handler = handler;
  41 }
  42
  43 static int
  44 process_event(event_t *event, unsigned long offset, unsigned long head)
  45 {
  46         trace_event(event);
  47
  48         switch (event->header.type) {
  49         case PERF_RECORD_SAMPLE:
  50                 return curr_handler->process_sample_event(event, offset, head);
  51         case PERF_RECORD_MMAP:
  52                 return curr_handler->process_mmap_event(event, offset, head);
  53         case PERF_RECORD_COMM:
  54                 return curr_handler->process_comm_event(event, offset, head);
  55         case PERF_RECORD_FORK:
  56                 return curr_handler->process_fork_event(event, offset, head);
  57         case PERF_RECORD_EXIT:
  58                 return curr_handler->process_exit_event(event, offset, head);
  59         case PERF_RECORD_LOST:
  60                 return curr_handler->process_lost_event(event, offset, head);
  61         case PERF_RECORD_READ:
  62                 return curr_handler->process_read_event(event, offset, head);
  63         case PERF_RECORD_THROTTLE:
  64                 return curr_handler->process_throttle_event(event, offset, head);
  65         case PERF_RECORD_UNTHROTTLE:
  66                 return curr_handler->process_unthrottle_event(event, offset, head);
  67         default:
  68                 curr_handler->total_unknown++;
  69                 return -1;
  70         }
  71 }
  72
  73 int perf_header__read_build_ids(int input, off_t size)
  74 {
  75         struct build_id_event bev;
  76         char filename[PATH_MAX];
  77         off_t offset = lseek(input, 0, SEEK_CUR);
  78         off_t limit = offset + size;
  79         int err = -1;
  80
  81         while (offset < limit) {
  82                 struct dso *dso;
  83                 ssize_t len;
  84
  85                 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
  86                         goto out;
  87
  88                 len = bev.header.size - sizeof(bev);
  89                 if (read(input, filename, len) != len)
  90                         goto out;
  91
  92                 dso = dsos__findnew(filename);
  93                 if (dso != NULL)
  94                         dso__set_build_id(dso, &bev.build_id);
  95
  96                 offset += bev.header.size;
  97         }
  98         err = 0;
  99 out:
 100         return err;
 101 }
 102
 103 int mmap_dispatch_perf_file(struct perf_header **pheader,
 104                             const char *input_name,
 105                             int force,
 106                             int full_paths,
 107                             int *cwdlen,
 108                             char **cwd)
 109 {
 110         int ret, rc = EXIT_FAILURE;
 111         struct perf_header *header;
 112         unsigned long head, shift;
 113         unsigned long offset = 0;
 114         struct stat input_stat;
 115         size_t  page_size;
 116         u64 sample_type;
 117         event_t *event;
 118         uint32_t size;
 119         int input;
 120         char *buf;
 121
 122         if (!curr_handler)
 123                 die("Forgot to register perf file handler");
 124
 125         page_size = getpagesize();
 126
 127         input = open(input_name, O_RDONLY);
 128         if (input < 0) {
 129                 fprintf(stderr, " failed to open file: %s", input_name);
 130                 if (!strcmp(input_name, "perf.data"))
 131                         fprintf(stderr, "  (try 'perf record' first)");
 132                 fprintf(stderr, "\n");
 133                 exit(-1);
 134         }
 135
 136         ret = fstat(input, &input_stat);
 137         if (ret < 0) {
 138                 perror("failed to stat file");
 139                 exit(-1);
 140         }
 141
 142         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
 143                 fprintf(stderr, "file: %s not owned by current user or root\n",
 144                         input_name);
 145                 exit(-1);
 146         }
 147
 148         if (!input_stat.st_size) {
 149                 fprintf(stderr, "zero-sized file, nothing to do!\n");
 150                 exit(0);
 151         }
 152
 153         *pheader = perf_header__read(input);
 154         header = *pheader;
 155         head = header->data_offset;
 156
 157         sample_type = perf_header__sample_type(header);
 158
 159         if (curr_handler->sample_type_check)
 160                 if (curr_handler->sample_type_check(sample_type) < 0)
 161                         exit(-1);
 162
 163         if (load_kernel(NULL) < 0) {
 164                 perror("failed to load kernel symbols");
 165                 return EXIT_FAILURE;
 166         }
 167
 168         if (!full_paths) {
 169                 if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
 170                         perror("failed to get the current directory");
 171                         return EXIT_FAILURE;
 172                 }
 173                 *cwd = __cwd;
 174                 *cwdlen = strlen(*cwd);
 175         } else {
 176                 *cwd = NULL;
 177                 *cwdlen = 0;
 178         }
 179
 180         shift = page_size * (head / page_size);
 181         offset += shift;
 182         head -= shift;
 183
 184 remap:
 185         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
 186                            MAP_SHARED, input, offset);
 187         if (buf == MAP_FAILED) {
 188                 perror("failed to mmap file");
 189                 exit(-1);
 190         }
 191
 192 more:
 193         event = (event_t *)(buf + head);
 194
 195         size = event->header.size;
 196         if (!size)
 197                 size = 8;
 198
 199         if (head + event->header.size >= page_size * mmap_window) {
 200                 int munmap_ret;
 201
 202                 shift = page_size * (head / page_size);
 203
 204                 munmap_ret = munmap(buf, page_size * mmap_window);
 205                 assert(munmap_ret == 0);
 206
 207                 offset += shift;
 208                 head -= shift;
 209                 goto remap;
 210         }
 211
 212         size = event->header.size;
 213
 214         dump_printf("\n%p [%p]: event: %d\n",
 215                         (void *)(offset + head),
 216                         (void *)(long)event->header.size,
 217                         event->header.type);
 218
 219         if (!size || process_event(event, offset, head) < 0) {
 220
 221                 dump_printf("%p [%p]: skipping unknown header type: %d\n",
 222                         (void *)(offset + head),
 223                         (void *)(long)(event->header.size),
 224                         event->header.type);
 225
 226                 /*
 227                  * assume we lost track of the stream, check alignment, and
 228                  * increment a single u64 in the hope to catch on again 'soon'.
 229                  */
 230
 231                 if (unlikely(head & 7))
 232                         head &= ~7ULL;
 233
 234                 size = 8;
 235         }
 236
 237         head += size;
 238
 239         if (offset + head >= header->data_offset + header->data_size)
 240                 goto done;
 241
 242         if (offset + head < (unsigned long)input_stat.st_size)
 243                 goto more;
 244
 245 done:
 246         rc = EXIT_SUCCESS;
 247         close(input);
 248
 249         return rc;
 250 }
 251
 252