tools/perf/builtin-annotate.c

   1 /*
   2  * builtin-annotate.c
   3  *
   4  * Builtin annotate command: Analyze the perf.data input file,
   5  * look up and read DSOs and symbol information and display
   6  * a histogram of results, along various sorting keys.
   7  */
   8 #include "builtin.h"
   9
  10 #include "util/util.h"
  11
  12 #include "util/color.h"
  13 #include <linux/list.h>
  14 #include "util/cache.h"
  15 #include <linux/rbtree.h>
  16 #include "util/symbol.h"
  17
  18 #include "perf.h"
  19 #include "util/debug.h"
  20
  21 #include "util/event.h"
  22 #include "util/parse-options.h"
  23 #include "util/parse-events.h"
  24 #include "util/thread.h"
  25 #include "util/sort.h"
  26 #include "util/hist.h"
  27 #include "util/session.h"
  28
  29 static char             const *input_name = "perf.data";
  30
  31 static bool             force;
  32
  33 static bool             full_paths;
  34
  35 static bool             print_line;
  36
  37 static const char *sym_hist_filter;
  38
  39 static int hists__add_entry(struct hists *self, struct addr_location *al)
  40 {
  41         struct hist_entry *he;
  42
  43         if (sym_hist_filter != NULL &&
  44             (al->sym == NULL || strcmp(sym_hist_filter, al->sym->name) != 0)) {
  45                 /* We're only interested in a symbol named sym_hist_filter */
  46                 if (al->sym != NULL) {
  47                         rb_erase(&al->sym->rb_node,
  48                                  &al->map->dso->symbols[al->map->type]);
  49                         symbol__delete(al->sym);
  50                 }
  51                 return 0;
  52         }
  53
  54         he = __hists__add_entry(self, al, NULL, 1);
  55         if (he == NULL)
  56                 return -ENOMEM;
  57
  58         return hist_entry__inc_addr_samples(he, al->addr);
  59 }
  60
  61 static int process_sample_event(event_t *event, struct perf_session *session)
  62 {
  63         struct addr_location al;
  64         struct sample_data data;
  65
  66         if (event__preprocess_sample(event, session, &al, &data, NULL) < 0) {
  67                 pr_warning("problem processing %d event, skipping it.\n",
  68                            event->header.type);
  69                 return -1;
  70         }
  71
  72         if (!al.filtered && hists__add_entry(&session->hists, &al)) {
  73                 pr_warning("problem incrementing symbol count, "
  74                            "skipping event\n");
  75                 return -1;
  76         }
  77
  78         return 0;
  79 }
  80
  81 static int objdump_line__print(struct objdump_line *self,
  82                                struct list_head *head,
  83                                struct hist_entry *he, u64 len)
  84 {
  85         struct symbol *sym = he->ms.sym;
  86         static const char *prev_line;
  87         static const char *prev_color;
  88
  89         if (self->offset != -1) {
  90                 const char *path = NULL;
  91                 unsigned int hits = 0;
  92                 double percent = 0.0;
  93                 const char *color;
  94                 struct sym_priv *priv = symbol__priv(sym);
  95                 struct sym_ext *sym_ext = priv->ext;
  96                 struct sym_hist *h = priv->hist;
  97                 s64 offset = self->offset;
  98                 struct objdump_line *next = objdump__get_next_ip_line(head, self);
  99
 100                 while (offset < (s64)len &&
 101                        (next == NULL || offset < next->offset)) {
 102                         if (sym_ext) {
 103                                 if (path == NULL)
 104                                         path = sym_ext[offset].path;
 105                                 percent += sym_ext[offset].percent;
 106                         } else
 107                                 hits += h->ip[offset];
 108
 109                         ++offset;
 110                 }
 111
 112                 if (sym_ext == NULL && h->sum)
 113                         percent = 100.0 * hits / h->sum;
 114
 115                 color = get_percent_color(percent);
 116
 117                 /*
 118                  * Also color the filename and line if needed, with
 119                  * the same color than the percentage. Don't print it
 120                  * twice for close colored ip with the same filename:line
 121                  */
 122                 if (path) {
 123                         if (!prev_line || strcmp(prev_line, path)
 124                                        || color != prev_color) {
 125                                 color_fprintf(stdout, color, " %s", path);
 126                                 prev_line = path;
 127                                 prev_color = color;
 128                         }
 129                 }
 130
 131                 color_fprintf(stdout, color, " %7.2f", percent);
 132                 printf(" :      ");
 133                 color_fprintf(stdout, PERF_COLOR_BLUE, "%s\n", self->line);
 134         } else {
 135                 if (!*self->line)
 136                         printf("         :\n");
 137                 else
 138                         printf("         :      %s\n", self->line);
 139         }
 140
 141         return 0;
 142 }
 143
 144 static struct rb_root root_sym_ext;
 145
 146 static void insert_source_line(struct sym_ext *sym_ext)
 147 {
 148         struct sym_ext *iter;
 149         struct rb_node **p = &root_sym_ext.rb_node;
 150         struct rb_node *parent = NULL;
 151
 152         while (*p != NULL) {
 153                 parent = *p;
 154                 iter = rb_entry(parent, struct sym_ext, node);
 155
 156                 if (sym_ext->percent > iter->percent)
 157                         p = &(*p)->rb_left;
 158                 else
 159                         p = &(*p)->rb_right;
 160         }
 161
 162         rb_link_node(&sym_ext->node, parent, p);
 163         rb_insert_color(&sym_ext->node, &root_sym_ext);
 164 }
 165
 166 static void free_source_line(struct hist_entry *he, int len)
 167 {
 168         struct sym_priv *priv = symbol__priv(he->ms.sym);
 169         struct sym_ext *sym_ext = priv->ext;
 170         int i;
 171
 172         if (!sym_ext)
 173                 return;
 174
 175         for (i = 0; i < len; i++)
 176                 free(sym_ext[i].path);
 177         free(sym_ext);
 178
 179         priv->ext = NULL;
 180         root_sym_ext = RB_ROOT;
 181 }
 182
 183 /* Get the filename:line for the colored entries */
 184 static void
 185 get_source_line(struct hist_entry *he, int len, const char *filename)
 186 {
 187         struct symbol *sym = he->ms.sym;
 188         u64 start;
 189         int i;
 190         char cmd[PATH_MAX * 2];
 191         struct sym_ext *sym_ext;
 192         struct sym_priv *priv = symbol__priv(sym);
 193         struct sym_hist *h = priv->hist;
 194
 195         if (!h->sum)
 196                 return;
 197
 198         sym_ext = priv->ext = calloc(len, sizeof(struct sym_ext));
 199         if (!priv->ext)
 200                 return;
 201
 202         start = he->ms.map->unmap_ip(he->ms.map, sym->start);
 203
 204         for (i = 0; i < len; i++) {
 205                 char *path = NULL;
 206                 size_t line_len;
 207                 u64 offset;
 208                 FILE *fp;
 209
 210                 sym_ext[i].percent = 100.0 * h->ip[i] / h->sum;
 211                 if (sym_ext[i].percent <= 0.5)
 212                         continue;
 213
 214                 offset = start + i;
 215                 sprintf(cmd, "addr2line -e %s %016llx", filename, offset);
 216                 fp = popen(cmd, "r");
 217                 if (!fp)
 218                         continue;
 219
 220                 if (getline(&path, &line_len, fp) < 0 || !line_len)
 221                         goto next;
 222
 223                 sym_ext[i].path = malloc(sizeof(char) * line_len + 1);
 224                 if (!sym_ext[i].path)
 225                         goto next;
 226
 227                 strcpy(sym_ext[i].path, path);
 228                 insert_source_line(&sym_ext[i]);
 229
 230         next:
 231                 pclose(fp);
 232         }
 233 }
 234
 235 static void print_summary(const char *filename)
 236 {
 237         struct sym_ext *sym_ext;
 238         struct rb_node *node;
 239
 240         printf("\nSorted summary for file %s\n", filename);
 241         printf("----------------------------------------------\n\n");
 242
 243         if (RB_EMPTY_ROOT(&root_sym_ext)) {
 244                 printf(" Nothing higher than %1.1f%%\n", MIN_GREEN);
 245                 return;
 246         }
 247
 248         node = rb_first(&root_sym_ext);
 249         while (node) {
 250                 double percent;
 251                 const char *color;
 252                 char *path;
 253
 254                 sym_ext = rb_entry(node, struct sym_ext, node);
 255                 percent = sym_ext->percent;
 256                 color = get_percent_color(percent);
 257                 path = sym_ext->path;
 258
 259                 color_fprintf(stdout, color, " %7.2f %s", percent, path);
 260                 node = rb_next(node);
 261         }
 262 }
 263
 264 static void hist_entry__print_hits(struct hist_entry *self)
 265 {
 266         struct symbol *sym = self->ms.sym;
 267         struct sym_priv *priv = symbol__priv(sym);
 268         struct sym_hist *h = priv->hist;
 269         u64 len = sym->end - sym->start, offset;
 270
 271         for (offset = 0; offset < len; ++offset)
 272                 if (h->ip[offset] != 0)
 273                         printf("%*Lx: %Lu\n", BITS_PER_LONG / 2,
 274                                sym->start + offset, h->ip[offset]);
 275         printf("%*s: %Lu\n", BITS_PER_LONG / 2, "h->sum", h->sum);
 276 }
 277
 278 static int hist_entry__tty_annotate(struct hist_entry *he)
 279 {
 280         struct map *map = he->ms.map;
 281         struct dso *dso = map->dso;
 282         struct symbol *sym = he->ms.sym;
 283         const char *filename = dso->long_name, *d_filename;
 284         u64 len;
 285         LIST_HEAD(head);
 286         struct objdump_line *pos, *n;
 287
 288         if (hist_entry__annotate(he, &head, 0) < 0)
 289                 return -1;
 290
 291         if (full_paths)
 292                 d_filename = filename;
 293         else
 294                 d_filename = basename(filename);
 295
 296         len = sym->end - sym->start;
 297
 298         if (print_line) {
 299                 get_source_line(he, len, filename);
 300                 print_summary(filename);
 301         }
 302
 303         printf("\n\n------------------------------------------------\n");
 304         printf(" Percent |      Source code & Disassembly of %s\n", d_filename);
 305         printf("------------------------------------------------\n");
 306
 307         if (verbose)
 308                 hist_entry__print_hits(he);
 309
 310         list_for_each_entry_safe(pos, n, &head, node) {
 311                 objdump_line__print(pos, &head, he, len);
 312                 list_del(&pos->node);
 313                 objdump_line__free(pos);
 314         }
 315
 316         if (print_line)
 317                 free_source_line(he, len);
 318
 319         return 0;
 320 }
 321
 322 static void hists__find_annotations(struct hists *self)
 323 {
 324         struct rb_node *first = rb_first(&self->entries), *nd = first;
 325         int key = KEY_RIGHT;
 326
 327         while (nd) {
 328                 struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
 329                 struct sym_priv *priv;
 330
 331                 if (he->ms.sym == NULL || he->ms.map->dso->annotate_warned)
 332                         goto find_next;
 333
 334                 priv = symbol__priv(he->ms.sym);
 335                 if (priv->hist == NULL) {
 336 find_next:
 337                         if (key == KEY_LEFT)
 338                                 nd = rb_prev(nd);
 339                         else
 340                                 nd = rb_next(nd);
 341                         continue;
 342                 }
 343
 344                 if (use_browser > 0) {
 345                         key = hist_entry__tui_annotate(he);
 346                         if (is_exit_key(key))
 347                                 break;
 348                         switch (key) {
 349                         case KEY_RIGHT:
 350                         case '\t':
 351                                 nd = rb_next(nd);
 352                                 break;
 353                         case KEY_LEFT:
 354                                 if (nd == first)
 355                                         continue;
 356                                 nd = rb_prev(nd);
 357                         default:
 358                                 break;
 359                         }
 360                 } else {
 361                         hist_entry__tty_annotate(he);
 362                         nd = rb_next(nd);
 363                         /*
 364                          * Since we have a hist_entry per IP for the same
 365                          * symbol, free he->ms.sym->hist to signal we already
 366                          * processed this symbol.
 367                          */
 368                         free(priv->hist);
 369                         priv->hist = NULL;
 370                 }
 371         }
 372 }
 373
 374 static struct perf_event_ops event_ops = {
 375         .sample = process_sample_event,
 376         .mmap   = event__process_mmap,
 377         .comm   = event__process_comm,
 378         .fork   = event__process_task,
 379 };
 380
 381 static int __cmd_annotate(void)
 382 {
 383         int ret;
 384         struct perf_session *session;
 385
 386         session = perf_session__new(input_name, O_RDONLY, force, false);
 387         if (session == NULL)
 388                 return -ENOMEM;
 389
 390         ret = perf_session__process_events(session, &event_ops);
 391         if (ret)
 392                 goto out_delete;
 393
 394         if (dump_trace) {
 395                 perf_session__fprintf_nr_events(session, stdout);
 396                 goto out_delete;
 397         }
 398
 399         if (verbose > 3)
 400                 perf_session__fprintf(session, stdout);
 401
 402         if (verbose > 2)
 403                 perf_session__fprintf_dsos(session, stdout);
 404
 405         hists__collapse_resort(&session->hists);
 406         hists__output_resort(&session->hists);
 407         hists__find_annotations(&session->hists);
 408 out_delete:
 409         perf_session__delete(session);
 410
 411         return ret;
 412 }
 413
 414 static const char * const annotate_usage[] = {
 415         "perf annotate [<options>] <command>",
 416         NULL
 417 };
 418
 419 static const struct option options[] = {
 420         OPT_STRING('i', "input", &input_name, "file",
 421                     "input file name"),
 422         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 423                    "only consider symbols in these dsos"),
 424         OPT_STRING('s', "symbol", &sym_hist_filter, "symbol",
 425                     "symbol to annotate"),
 426         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 427         OPT_INCR('v', "verbose", &verbose,
 428                     "be more verbose (show symbol address, etc)"),
 429         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 430                     "dump raw trace in ASCII"),
 431         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
 432                    "file", "vmlinux pathname"),
 433         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 434                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 435         OPT_BOOLEAN('l', "print-line", &print_line,
 436                     "print matching source lines (may be slow)"),
 437         OPT_BOOLEAN('P', "full-paths", &full_paths,
 438                     "Don't shorten the displayed pathnames"),
 439         OPT_END()
 440 };
 441
 442 int cmd_annotate(int argc, const char **argv, const char *prefix __used)
 443 {
 444         argc = parse_options(argc, argv, options, annotate_usage, 0);
 445
 446         setup_browser();
 447
 448         symbol_conf.priv_size = sizeof(struct sym_priv);
 449         symbol_conf.try_vmlinux_path = true;
 450
 451         if (symbol__init() < 0)
 452                 return -1;
 453
 454         setup_sorting(annotate_usage, options);
 455
 456         if (argc) {
 457                 /*
 458                  * Special case: if there's an argument left then assume tha
 459                  * it's a symbol filter:
 460                  */
 461                 if (argc > 1)
 462                         usage_with_options(annotate_usage, options);
 463
 464                 sym_hist_filter = argv[0];
 465         }
 466
 467         if (field_sep && *field_sep == '.') {
 468                 pr_err("'.' is the only non valid --field-separator argument\n");
 469                 return -1;
 470         }
 471
 472         return __cmd_annotate();
 473 }