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 #include "util/color.h"
  12 #include <linux/list.h>
  13 #include "util/cache.h"
  14 #include <linux/rbtree.h>
  15 #include "util/symbol.h"
  16
  17 #include "perf.h"
  18 #include "util/debug.h"
  19
  20 #include "util/evlist.h"
  21 #include "util/evsel.h"
  22 #include "util/annotate.h"
  23 #include "util/event.h"
  24 #include "util/parse-options.h"
  25 #include "util/parse-events.h"
  26 #include "util/thread.h"
  27 #include "util/sort.h"
  28 #include "util/hist.h"
  29 #include "util/session.h"
  30 #include "util/tool.h"
  31 #include "util/data.h"
  32 #include "arch/common.h"
  33
  34 #include <dlfcn.h>
  35 #include <linux/bitmap.h>
  36
  37 struct perf_annotate {
  38         struct perf_tool tool;
  39         struct perf_session *session;
  40         bool       use_tui, use_stdio, use_gtk;
  41         bool       full_paths;
  42         bool       print_line;
  43         bool       skip_missing;
  44         const char *sym_hist_filter;
  45         const char *cpu_list;
  46         DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
  47 };
  48
  49 static int perf_evsel__add_sample(struct perf_evsel *evsel,
  50                                   struct perf_sample *sample __maybe_unused,
  51                                   struct addr_location *al,
  52                                   struct perf_annotate *ann)
  53 {
  54         struct hists *hists = evsel__hists(evsel);
  55         struct hist_entry *he;
  56         int ret;
  57
  58         if (ann->sym_hist_filter != NULL &&
  59             (al->sym == NULL ||
  60              strcmp(ann->sym_hist_filter, al->sym->name) != 0)) {
  61                 /* We're only interested in a symbol named sym_hist_filter */
  62                 /*
  63                  * FIXME: why isn't this done in the symbol_filter when loading
  64                  * the DSO?
  65                  */
  66                 if (al->sym != NULL) {
  67                         rb_erase(&al->sym->rb_node,
  68                                  &al->map->dso->symbols[al->map->type]);
  69                         symbol__delete(al->sym);
  70                 }
  71                 return 0;
  72         }
  73
  74         he = __hists__add_entry(hists, al, NULL, NULL, NULL, 1, 1, 0, true);
  75         if (he == NULL)
  76                 return -ENOMEM;
  77
  78         ret = hist_entry__inc_addr_samples(he, evsel->idx, al->addr);
  79         hists__inc_nr_samples(hists, true);
  80         return ret;
  81 }
  82
  83 static int process_sample_event(struct perf_tool *tool,
  84                                 union perf_event *event,
  85                                 struct perf_sample *sample,
  86                                 struct perf_evsel *evsel,
  87                                 struct machine *machine)
  88 {
  89         struct perf_annotate *ann = container_of(tool, struct perf_annotate, tool);
  90         struct addr_location al;
  91         int ret = 0;
  92
  93         if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
  94                 pr_warning("problem processing %d event, skipping it.\n",
  95                            event->header.type);
  96                 return -1;
  97         }
  98
  99         if (ann->cpu_list && !test_bit(sample->cpu, ann->cpu_bitmap))
 100                 goto out_put;
 101
 102         if (!al.filtered && perf_evsel__add_sample(evsel, sample, &al, ann)) {
 103                 pr_warning("problem incrementing symbol count, "
 104                            "skipping event\n");
 105                 ret = -1;
 106         }
 107 out_put:
 108         addr_location__put(&al);
 109         return ret;
 110 }
 111
 112 static int hist_entry__tty_annotate(struct hist_entry *he,
 113                                     struct perf_evsel *evsel,
 114                                     struct perf_annotate *ann)
 115 {
 116         return symbol__tty_annotate(he->ms.sym, he->ms.map, evsel,
 117                                     ann->print_line, ann->full_paths, 0, 0);
 118 }
 119
 120 static void hists__find_annotations(struct hists *hists,
 121                                     struct perf_evsel *evsel,
 122                                     struct perf_annotate *ann)
 123 {
 124         struct rb_node *nd = rb_first(&hists->entries), *next;
 125         int key = K_RIGHT;
 126
 127         while (nd) {
 128                 struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
 129                 struct annotation *notes;
 130
 131                 if (he->ms.sym == NULL || he->ms.map->dso->annotate_warned)
 132                         goto find_next;
 133
 134                 notes = symbol__annotation(he->ms.sym);
 135                 if (notes->src == NULL) {
 136 find_next:
 137                         if (key == K_LEFT)
 138                                 nd = rb_prev(nd);
 139                         else
 140                                 nd = rb_next(nd);
 141                         continue;
 142                 }
 143
 144                 if (use_browser == 2) {
 145                         int ret;
 146                         int (*annotate)(struct hist_entry *he,
 147                                         struct perf_evsel *evsel,
 148                                         struct hist_browser_timer *hbt);
 149
 150                         annotate = dlsym(perf_gtk_handle,
 151                                          "hist_entry__gtk_annotate");
 152                         if (annotate == NULL) {
 153                                 ui__error("GTK browser not found!\n");
 154                                 return;
 155                         }
 156
 157                         ret = annotate(he, evsel, NULL);
 158                         if (!ret || !ann->skip_missing)
 159                                 return;
 160
 161                         /* skip missing symbols */
 162                         nd = rb_next(nd);
 163                 } else if (use_browser == 1) {
 164                         key = hist_entry__tui_annotate(he, evsel, NULL);
 165                         switch (key) {
 166                         case -1:
 167                                 if (!ann->skip_missing)
 168                                         return;
 169                                 /* fall through */
 170                         case K_RIGHT:
 171                                 next = rb_next(nd);
 172                                 break;
 173                         case K_LEFT:
 174                                 next = rb_prev(nd);
 175                                 break;
 176                         default:
 177                                 return;
 178                         }
 179
 180                         if (next != NULL)
 181                                 nd = next;
 182                 } else {
 183                         hist_entry__tty_annotate(he, evsel, ann);
 184                         nd = rb_next(nd);
 185                         /*
 186                          * Since we have a hist_entry per IP for the same
 187                          * symbol, free he->ms.sym->src to signal we already
 188                          * processed this symbol.
 189                          */
 190                         zfree(&notes->src);
 191                 }
 192         }
 193 }
 194
 195 static int __cmd_annotate(struct perf_annotate *ann)
 196 {
 197         int ret;
 198         struct perf_session *session = ann->session;
 199         struct perf_evsel *pos;
 200         u64 total_nr_samples;
 201
 202         machines__set_symbol_filter(&session->machines, symbol__annotate_init);
 203
 204         if (ann->cpu_list) {
 205                 ret = perf_session__cpu_bitmap(session, ann->cpu_list,
 206                                                ann->cpu_bitmap);
 207                 if (ret)
 208                         goto out;
 209         }
 210
 211         if (!objdump_path) {
 212                 ret = perf_session_env__lookup_objdump(&session->header.env);
 213                 if (ret)
 214                         goto out;
 215         }
 216
 217         ret = perf_session__process_events(session);
 218         if (ret)
 219                 goto out;
 220
 221         if (dump_trace) {
 222                 perf_session__fprintf_nr_events(session, stdout);
 223                 perf_evlist__fprintf_nr_events(session->evlist, stdout);
 224                 goto out;
 225         }
 226
 227         if (verbose > 3)
 228                 perf_session__fprintf(session, stdout);
 229
 230         if (verbose > 2)
 231                 perf_session__fprintf_dsos(session, stdout);
 232
 233         total_nr_samples = 0;
 234         evlist__for_each(session->evlist, pos) {
 235                 struct hists *hists = evsel__hists(pos);
 236                 u32 nr_samples = hists->stats.nr_events[PERF_RECORD_SAMPLE];
 237
 238                 if (nr_samples > 0) {
 239                         total_nr_samples += nr_samples;
 240                         hists__collapse_resort(hists, NULL);
 241                         hists__output_resort(hists, NULL);
 242
 243                         if (symbol_conf.event_group &&
 244                             !perf_evsel__is_group_leader(pos))
 245                                 continue;
 246
 247                         hists__find_annotations(hists, pos, ann);
 248                 }
 249         }
 250
 251         if (total_nr_samples == 0) {
 252                 ui__error("The %s file has no samples!\n", session->file->path);
 253                 goto out;
 254         }
 255
 256         if (use_browser == 2) {
 257                 void (*show_annotations)(void);
 258
 259                 show_annotations = dlsym(perf_gtk_handle,
 260                                          "perf_gtk__show_annotations");
 261                 if (show_annotations == NULL) {
 262                         ui__error("GTK browser not found!\n");
 263                         goto out;
 264                 }
 265                 show_annotations();
 266         }
 267
 268 out:
 269         return ret;
 270 }
 271
 272 static const char * const annotate_usage[] = {
 273         "perf annotate [<options>]",
 274         NULL
 275 };
 276
 277 int cmd_annotate(int argc, const char **argv, const char *prefix __maybe_unused)
 278 {
 279         struct perf_annotate annotate = {
 280                 .tool = {
 281                         .sample = process_sample_event,
 282                         .mmap   = perf_event__process_mmap,
 283                         .mmap2  = perf_event__process_mmap2,
 284                         .comm   = perf_event__process_comm,
 285                         .exit   = perf_event__process_exit,
 286                         .fork   = perf_event__process_fork,
 287                         .ordered_events = true,
 288                         .ordering_requires_timestamps = true,
 289                 },
 290         };
 291         struct perf_data_file file = {
 292                 .mode  = PERF_DATA_MODE_READ,
 293         };
 294         const struct option options[] = {
 295         OPT_STRING('i', "input", &input_name, "file",
 296                     "input file name"),
 297         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 298                    "only consider symbols in these dsos"),
 299         OPT_STRING('s', "symbol", &annotate.sym_hist_filter, "symbol",
 300                     "symbol to annotate"),
 301         OPT_BOOLEAN('f', "force", &file.force, "don't complain, do it"),
 302         OPT_INCR('v', "verbose", &verbose,
 303                     "be more verbose (show symbol address, etc)"),
 304         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 305                     "dump raw trace in ASCII"),
 306         OPT_BOOLEAN(0, "gtk", &annotate.use_gtk, "Use the GTK interface"),
 307         OPT_BOOLEAN(0, "tui", &annotate.use_tui, "Use the TUI interface"),
 308         OPT_BOOLEAN(0, "stdio", &annotate.use_stdio, "Use the stdio interface"),
 309         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
 310                    "file", "vmlinux pathname"),
 311         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 312                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 313         OPT_BOOLEAN('l', "print-line", &annotate.print_line,
 314                     "print matching source lines (may be slow)"),
 315         OPT_BOOLEAN('P', "full-paths", &annotate.full_paths,
 316                     "Don't shorten the displayed pathnames"),
 317         OPT_BOOLEAN(0, "skip-missing", &annotate.skip_missing,
 318                     "Skip symbols that cannot be annotated"),
 319         OPT_STRING('C', "cpu", &annotate.cpu_list, "cpu", "list of cpus to profile"),
 320         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 321                    "Look for files with symbols relative to this directory"),
 322         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
 323                     "Interleave source code with assembly code (default)"),
 324         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
 325                     "Display raw encoding of assembly instructions (default)"),
 326         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
 327                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
 328         OPT_STRING(0, "objdump", &objdump_path, "path",
 329                    "objdump binary to use for disassembly and annotations"),
 330         OPT_BOOLEAN(0, "group", &symbol_conf.event_group,
 331                     "Show event group information together"),
 332         OPT_END()
 333         };
 334         int ret = hists__init();
 335
 336         if (ret < 0)
 337                 return ret;
 338
 339         argc = parse_options(argc, argv, options, annotate_usage, 0);
 340
 341         if (annotate.use_stdio)
 342                 use_browser = 0;
 343         else if (annotate.use_tui)
 344                 use_browser = 1;
 345         else if (annotate.use_gtk)
 346                 use_browser = 2;
 347
 348         file.path  = input_name;
 349
 350         setup_browser(true);
 351
 352         annotate.session = perf_session__new(&file, false, &annotate.tool);
 353         if (annotate.session == NULL)
 354                 return -1;
 355
 356         symbol_conf.priv_size = sizeof(struct annotation);
 357         symbol_conf.try_vmlinux_path = true;
 358
 359         ret = symbol__init(&annotate.session->header.env);
 360         if (ret < 0)
 361                 goto out_delete;
 362
 363         if (setup_sorting() < 0)
 364                 usage_with_options(annotate_usage, options);
 365
 366         if (argc) {
 367                 /*
 368                  * Special case: if there's an argument left then assume that
 369                  * it's a symbol filter:
 370                  */
 371                 if (argc > 1)
 372                         usage_with_options(annotate_usage, options);
 373
 374                 annotate.sym_hist_filter = argv[0];
 375         }
 376
 377         ret = __cmd_annotate(&annotate);
 378
 379 out_delete:
 380         /*
 381          * Speed up the exit process, for large files this can
 382          * take quite a while.
 383          *
 384          * XXX Enable this when using valgrind or if we ever
 385          * librarize this command.
 386          *
 387          * Also experiment with obstacks to see how much speed
 388          * up we'll get here.
 389          *
 390          * perf_session__delete(session);
 391          */
 392         return ret;
 393 }