tools/perf/builtin-diff.c

   1 /*
   2  * builtin-diff.c
   3  *
   4  * Builtin diff command: Analyze two perf.data input files, look up and read
   5  * DSOs and symbol information, sort them and produce a diff.
   6  */
   7 #include "builtin.h"
   8
   9 #include "util/debug.h"
  10 #include "util/event.h"
  11 #include "util/hist.h"
  12 #include "util/evsel.h"
  13 #include "util/evlist.h"
  14 #include "util/session.h"
  15 #include "util/tool.h"
  16 #include "util/sort.h"
  17 #include "util/symbol.h"
  18 #include "util/util.h"
  19
  20 #include <stdlib.h>
  21 #include <math.h>
  22
  23 /* Diff command specific HPP columns. */
  24 enum {
  25         PERF_HPP_DIFF__BASELINE,
  26         PERF_HPP_DIFF__PERIOD,
  27         PERF_HPP_DIFF__PERIOD_BASELINE,
  28         PERF_HPP_DIFF__DELTA,
  29         PERF_HPP_DIFF__RATIO,
  30         PERF_HPP_DIFF__WEIGHTED_DIFF,
  31         PERF_HPP_DIFF__FORMULA,
  32
  33         PERF_HPP_DIFF__MAX_INDEX
  34 };
  35
  36 struct diff_hpp_fmt {
  37         struct perf_hpp_fmt      fmt;
  38         int                      idx;
  39         char                    *header;
  40         int                      header_width;
  41 };
  42
  43 struct data__file {
  44         struct perf_session     *session;
  45         const char              *file;
  46         int                      idx;
  47 };
  48
  49 static struct data__file *data__files;
  50 static int data__files_cnt;
  51
  52 #define data__for_each_file_start(i, d, s)      \
  53         for (i = s, d = &data__files[s];        \
  54              i < data__files_cnt;               \
  55              i++, d = &data__files[i])
  56
  57 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  58
  59 static char diff__default_sort_order[] = "dso,symbol";
  60 static bool force;
  61 static bool show_period;
  62 static bool show_formula;
  63 static bool show_baseline_only;
  64 static bool sort_compute;
  65
  66 static s64 compute_wdiff_w1;
  67 static s64 compute_wdiff_w2;
  68
  69 enum {
  70         COMPUTE_DELTA,
  71         COMPUTE_RATIO,
  72         COMPUTE_WEIGHTED_DIFF,
  73         COMPUTE_MAX,
  74 };
  75
  76 const char *compute_names[COMPUTE_MAX] = {
  77         [COMPUTE_DELTA] = "delta",
  78         [COMPUTE_RATIO] = "ratio",
  79         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
  80 };
  81
  82 static int compute;
  83
  84 static int compute_2_hpp[COMPUTE_MAX] = {
  85         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
  86         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
  87         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
  88 };
  89
  90 #define MAX_COL_WIDTH 70
  91
  92 static struct header_column {
  93         const char *name;
  94         int width;
  95 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
  96         [PERF_HPP_DIFF__BASELINE] = {
  97                 .name  = "Baseline",
  98         },
  99         [PERF_HPP_DIFF__PERIOD] = {
 100                 .name  = "Period",
 101                 .width = 14,
 102         },
 103         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
 104                 .name  = "Base period",
 105                 .width = 14,
 106         },
 107         [PERF_HPP_DIFF__DELTA] = {
 108                 .name  = "Delta",
 109                 .width = 7,
 110         },
 111         [PERF_HPP_DIFF__RATIO] = {
 112                 .name  = "Ratio",
 113                 .width = 14,
 114         },
 115         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 116                 .name  = "Weighted diff",
 117                 .width = 14,
 118         },
 119         [PERF_HPP_DIFF__FORMULA] = {
 120                 .name  = "Formula",
 121                 .width = MAX_COL_WIDTH,
 122         }
 123 };
 124
 125 static int setup_compute_opt_wdiff(char *opt)
 126 {
 127         char *w1_str = opt;
 128         char *w2_str;
 129
 130         int ret = -EINVAL;
 131
 132         if (!opt)
 133                 goto out;
 134
 135         w2_str = strchr(opt, ',');
 136         if (!w2_str)
 137                 goto out;
 138
 139         *w2_str++ = 0x0;
 140         if (!*w2_str)
 141                 goto out;
 142
 143         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 144         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 145
 146         if (!compute_wdiff_w1 || !compute_wdiff_w2)
 147                 goto out;
 148
 149         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 150                   compute_wdiff_w1, compute_wdiff_w2);
 151
 152         ret = 0;
 153
 154  out:
 155         if (ret)
 156                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 157
 158         return ret;
 159 }
 160
 161 static int setup_compute_opt(char *opt)
 162 {
 163         if (compute == COMPUTE_WEIGHTED_DIFF)
 164                 return setup_compute_opt_wdiff(opt);
 165
 166         if (opt) {
 167                 pr_err("Failed: extra option specified '%s'", opt);
 168                 return -EINVAL;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static int setup_compute(const struct option *opt, const char *str,
 175                          int unset __maybe_unused)
 176 {
 177         int *cp = (int *) opt->value;
 178         char *cstr = (char *) str;
 179         char buf[50];
 180         unsigned i;
 181         char *option;
 182
 183         if (!str) {
 184                 *cp = COMPUTE_DELTA;
 185                 return 0;
 186         }
 187
 188         if (*str == '+') {
 189                 sort_compute = true;
 190                 cstr = (char *) ++str;
 191                 if (!*str)
 192                         return 0;
 193         }
 194
 195         option = strchr(str, ':');
 196         if (option) {
 197                 unsigned len = option++ - str;
 198
 199                 /*
 200                  * The str data are not writeable, so we need
 201                  * to use another buffer.
 202                  */
 203
 204                 /* No option value is longer. */
 205                 if (len >= sizeof(buf))
 206                         return -EINVAL;
 207
 208                 strncpy(buf, str, len);
 209                 buf[len] = 0x0;
 210                 cstr = buf;
 211         }
 212
 213         for (i = 0; i < COMPUTE_MAX; i++)
 214                 if (!strcmp(cstr, compute_names[i])) {
 215                         *cp = i;
 216                         return setup_compute_opt(option);
 217                 }
 218
 219         pr_err("Failed: '%s' is not computation method "
 220                "(use 'delta','ratio' or 'wdiff')\n", str);
 221         return -EINVAL;
 222 }
 223
 224 double perf_diff__period_percent(struct hist_entry *he, u64 period)
 225 {
 226         u64 total = he->hists->stats.total_period;
 227         return (period * 100.0) / total;
 228 }
 229
 230 double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair)
 231 {
 232         double old_percent = perf_diff__period_percent(he, he->stat.period);
 233         double new_percent = perf_diff__period_percent(pair, pair->stat.period);
 234
 235         pair->diff.period_ratio_delta = new_percent - old_percent;
 236         pair->diff.computed = true;
 237         return pair->diff.period_ratio_delta;
 238 }
 239
 240 double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 241 {
 242         double old_period = he->stat.period ?: 1;
 243         double new_period = pair->stat.period;
 244
 245         pair->diff.computed = true;
 246         pair->diff.period_ratio = new_period / old_period;
 247         return pair->diff.period_ratio;
 248 }
 249
 250 s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 251 {
 252         u64 old_period = he->stat.period;
 253         u64 new_period = pair->stat.period;
 254
 255         pair->diff.computed = true;
 256         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 257                            old_period * compute_wdiff_w1;
 258
 259         return pair->diff.wdiff;
 260 }
 261
 262 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 263                          char *buf, size_t size)
 264 {
 265         return scnprintf(buf, size,
 266                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 267                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 268                           pair->stat.period, pair->hists->stats.total_period,
 269                           he->stat.period, he->hists->stats.total_period);
 270 }
 271
 272 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 273                          char *buf, size_t size)
 274 {
 275         double old_period = he->stat.period;
 276         double new_period = pair->stat.period;
 277
 278         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 279 }
 280
 281 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 282                          char *buf, size_t size)
 283 {
 284         u64 old_period = he->stat.period;
 285         u64 new_period = pair->stat.period;
 286
 287         return scnprintf(buf, size,
 288                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 289                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 290 }
 291
 292 int perf_diff__formula(struct hist_entry *he, struct hist_entry *pair,
 293                        char *buf, size_t size)
 294 {
 295         switch (compute) {
 296         case COMPUTE_DELTA:
 297                 return formula_delta(he, pair, buf, size);
 298         case COMPUTE_RATIO:
 299                 return formula_ratio(he, pair, buf, size);
 300         case COMPUTE_WEIGHTED_DIFF:
 301                 return formula_wdiff(he, pair, buf, size);
 302         default:
 303                 BUG_ON(1);
 304         }
 305
 306         return -1;
 307 }
 308
 309 static int hists__add_entry(struct hists *self,
 310                             struct addr_location *al, u64 period,
 311                             u64 weight)
 312 {
 313         if (__hists__add_entry(self, al, NULL, period, weight) != NULL)
 314                 return 0;
 315         return -ENOMEM;
 316 }
 317
 318 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
 319                                       union perf_event *event,
 320                                       struct perf_sample *sample,
 321                                       struct perf_evsel *evsel,
 322                                       struct machine *machine)
 323 {
 324         struct addr_location al;
 325
 326         if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
 327                 pr_warning("problem processing %d event, skipping it.\n",
 328                            event->header.type);
 329                 return -1;
 330         }
 331
 332         if (al.filtered)
 333                 return 0;
 334
 335         if (hists__add_entry(&evsel->hists, &al, sample->period, sample->weight)) {
 336                 pr_warning("problem incrementing symbol period, skipping event\n");
 337                 return -1;
 338         }
 339
 340         evsel->hists.stats.total_period += sample->period;
 341         return 0;
 342 }
 343
 344 static struct perf_tool tool = {
 345         .sample = diff__process_sample_event,
 346         .mmap   = perf_event__process_mmap,
 347         .comm   = perf_event__process_comm,
 348         .exit   = perf_event__process_exit,
 349         .fork   = perf_event__process_fork,
 350         .lost   = perf_event__process_lost,
 351         .ordered_samples = true,
 352         .ordering_requires_timestamps = true,
 353 };
 354
 355 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 356                                       struct perf_evlist *evlist)
 357 {
 358         struct perf_evsel *e;
 359
 360         list_for_each_entry(e, &evlist->entries, node)
 361                 if (perf_evsel__match2(evsel, e))
 362                         return e;
 363
 364         return NULL;
 365 }
 366
 367 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 368 {
 369         struct perf_evsel *evsel;
 370
 371         list_for_each_entry(evsel, &evlist->entries, node) {
 372                 struct hists *hists = &evsel->hists;
 373
 374                 hists__collapse_resort(hists);
 375         }
 376 }
 377
 378 static void hists__baseline_only(struct hists *hists)
 379 {
 380         struct rb_root *root;
 381         struct rb_node *next;
 382
 383         if (sort__need_collapse)
 384                 root = &hists->entries_collapsed;
 385         else
 386                 root = hists->entries_in;
 387
 388         next = rb_first(root);
 389         while (next != NULL) {
 390                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 391
 392                 next = rb_next(&he->rb_node_in);
 393                 if (!hist_entry__next_pair(he)) {
 394                         rb_erase(&he->rb_node_in, root);
 395                         hist_entry__free(he);
 396                 }
 397         }
 398 }
 399
 400 static void hists__precompute(struct hists *hists)
 401 {
 402         struct rb_root *root;
 403         struct rb_node *next;
 404
 405         if (sort__need_collapse)
 406                 root = &hists->entries_collapsed;
 407         else
 408                 root = hists->entries_in;
 409
 410         next = rb_first(root);
 411         while (next != NULL) {
 412                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 413                 struct hist_entry *pair = hist_entry__next_pair(he);
 414
 415                 next = rb_next(&he->rb_node_in);
 416                 if (!pair)
 417                         continue;
 418
 419                 switch (compute) {
 420                 case COMPUTE_DELTA:
 421                         perf_diff__compute_delta(he, pair);
 422                         break;
 423                 case COMPUTE_RATIO:
 424                         perf_diff__compute_ratio(he, pair);
 425                         break;
 426                 case COMPUTE_WEIGHTED_DIFF:
 427                         perf_diff__compute_wdiff(he, pair);
 428                         break;
 429                 default:
 430                         BUG_ON(1);
 431                 }
 432         }
 433 }
 434
 435 static int64_t cmp_doubles(double l, double r)
 436 {
 437         if (l > r)
 438                 return -1;
 439         else if (l < r)
 440                 return 1;
 441         else
 442                 return 0;
 443 }
 444
 445 static int64_t
 446 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 447                         int c)
 448 {
 449         switch (c) {
 450         case COMPUTE_DELTA:
 451         {
 452                 double l = left->diff.period_ratio_delta;
 453                 double r = right->diff.period_ratio_delta;
 454
 455                 return cmp_doubles(l, r);
 456         }
 457         case COMPUTE_RATIO:
 458         {
 459                 double l = left->diff.period_ratio;
 460                 double r = right->diff.period_ratio;
 461
 462                 return cmp_doubles(l, r);
 463         }
 464         case COMPUTE_WEIGHTED_DIFF:
 465         {
 466                 s64 l = left->diff.wdiff;
 467                 s64 r = right->diff.wdiff;
 468
 469                 return r - l;
 470         }
 471         default:
 472                 BUG_ON(1);
 473         }
 474
 475         return 0;
 476 }
 477
 478 static void insert_hist_entry_by_compute(struct rb_root *root,
 479                                          struct hist_entry *he,
 480                                          int c)
 481 {
 482         struct rb_node **p = &root->rb_node;
 483         struct rb_node *parent = NULL;
 484         struct hist_entry *iter;
 485
 486         while (*p != NULL) {
 487                 parent = *p;
 488                 iter = rb_entry(parent, struct hist_entry, rb_node);
 489                 if (hist_entry__cmp_compute(he, iter, c) < 0)
 490                         p = &(*p)->rb_left;
 491                 else
 492                         p = &(*p)->rb_right;
 493         }
 494
 495         rb_link_node(&he->rb_node, parent, p);
 496         rb_insert_color(&he->rb_node, root);
 497 }
 498
 499 static void hists__compute_resort(struct hists *hists)
 500 {
 501         struct rb_root *root;
 502         struct rb_node *next;
 503
 504         if (sort__need_collapse)
 505                 root = &hists->entries_collapsed;
 506         else
 507                 root = hists->entries_in;
 508
 509         hists->entries = RB_ROOT;
 510         next = rb_first(root);
 511
 512         hists->nr_entries = 0;
 513         hists->stats.total_period = 0;
 514         hists__reset_col_len(hists);
 515
 516         while (next != NULL) {
 517                 struct hist_entry *he;
 518
 519                 he = rb_entry(next, struct hist_entry, rb_node_in);
 520                 next = rb_next(&he->rb_node_in);
 521
 522                 insert_hist_entry_by_compute(&hists->entries, he, compute);
 523                 hists__inc_nr_entries(hists, he);
 524         }
 525 }
 526
 527 static void hists__process(struct hists *base, struct hists *new)
 528 {
 529         hists__match(base, new);
 530
 531         if (show_baseline_only)
 532                 hists__baseline_only(base);
 533         else
 534                 hists__link(base, new);
 535
 536         if (sort_compute) {
 537                 hists__precompute(base);
 538                 hists__compute_resort(base);
 539         } else {
 540                 hists__output_resort(base);
 541         }
 542
 543         hists__fprintf(base, true, 0, 0, 0, stdout);
 544 }
 545
 546 static void data__fprintf(void)
 547 {
 548         struct data__file *d;
 549         int i;
 550
 551         fprintf(stdout, "# Data files:\n");
 552
 553         data__for_each_file(i, d)
 554                 fprintf(stdout, "#  [%d] %s %s\n",
 555                         d->idx, d->file,
 556                         !d->idx ? "(Baseline)" : "");
 557
 558         fprintf(stdout, "#\n");
 559 }
 560
 561 static void data_process(void)
 562 {
 563         struct perf_evlist *evlist_old = data__files[0].session->evlist;
 564         struct perf_evlist *evlist_new = data__files[1].session->evlist;
 565         struct perf_evsel *evsel_old;
 566         bool first = true;
 567
 568         list_for_each_entry(evsel_old, &evlist_old->entries, node) {
 569                 struct perf_evsel *evsel_new;
 570
 571                 evsel_new = evsel_match(evsel_old, evlist_new);
 572                 if (!evsel_new)
 573                         continue;
 574
 575                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 576                         perf_evsel__name(evsel_old));
 577
 578                 first = false;
 579
 580                 if (verbose)
 581                         data__fprintf();
 582
 583                 hists__process(&evsel_old->hists, &evsel_new->hists);
 584         }
 585 }
 586
 587 static int __cmd_diff(void)
 588 {
 589         struct data__file *d;
 590         int ret = -EINVAL, i;
 591
 592         data__for_each_file(i, d) {
 593                 d->session = perf_session__new(d->file, O_RDONLY, force,
 594                                                false, &tool);
 595                 if (!d->session) {
 596                         pr_err("Failed to open %s\n", d->file);
 597                         ret = -ENOMEM;
 598                         goto out_delete;
 599                 }
 600
 601                 ret = perf_session__process_events(d->session, &tool);
 602                 if (ret) {
 603                         pr_err("Failed to process %s\n", d->file);
 604                         goto out_delete;
 605                 }
 606
 607                 perf_evlist__collapse_resort(d->session->evlist);
 608         }
 609
 610         data_process();
 611
 612  out_delete:
 613         data__for_each_file(i, d) {
 614                 if (d->session)
 615                         perf_session__delete(d->session);
 616         }
 617
 618         free(data__files);
 619         return ret;
 620 }
 621
 622 static const char * const diff_usage[] = {
 623         "perf diff [<options>] [old_file] [new_file]",
 624         NULL,
 625 };
 626
 627 static const struct option options[] = {
 628         OPT_INCR('v', "verbose", &verbose,
 629                     "be more verbose (show symbol address, etc)"),
 630         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 631                     "Show only items with match in baseline"),
 632         OPT_CALLBACK('c', "compute", &compute,
 633                      "delta,ratio,wdiff:w1,w2 (default delta)",
 634                      "Entries differential computation selection",
 635                      setup_compute),
 636         OPT_BOOLEAN('p', "period", &show_period,
 637                     "Show period values."),
 638         OPT_BOOLEAN('F', "formula", &show_formula,
 639                     "Show formula."),
 640         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 641                     "dump raw trace in ASCII"),
 642         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 643         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 644                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 645         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 646                    "only consider symbols in these dsos"),
 647         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 648                    "only consider symbols in these comms"),
 649         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 650                    "only consider these symbols"),
 651         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 652                    "sort by key(s): pid, comm, dso, symbol, parent"),
 653         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 654                    "separator for columns, no spaces will be added between "
 655                    "columns '.' is reserved."),
 656         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 657                     "Look for files with symbols relative to this directory"),
 658         OPT_END()
 659 };
 660
 661 static double baseline_percent(struct hist_entry *he)
 662 {
 663         struct hists *hists = he->hists;
 664         return 100.0 * he->stat.period / hists->stats.total_period;
 665 }
 666
 667 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 668                                struct perf_hpp *hpp, struct hist_entry *he)
 669 {
 670         struct diff_hpp_fmt *dfmt =
 671                 container_of(fmt, struct diff_hpp_fmt, fmt);
 672         double percent = baseline_percent(he);
 673         char pfmt[20] = " ";
 674
 675         if (!he->dummy) {
 676                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 677                 return percent_color_snprintf(hpp->buf, hpp->size,
 678                                               pfmt, percent);
 679         } else
 680                 return scnprintf(hpp->buf, hpp->size, "%*s",
 681                                  dfmt->header_width, pfmt);
 682 }
 683
 684 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 685 {
 686         double percent = baseline_percent(he);
 687         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 688         int ret = 0;
 689
 690         if (!he->dummy)
 691                 ret = scnprintf(buf, size, fmt, percent);
 692
 693         return ret;
 694 }
 695
 696 static void
 697 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 698 {
 699         switch (idx) {
 700         case PERF_HPP_DIFF__PERIOD_BASELINE:
 701                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 702                 break;
 703
 704         default:
 705                 break;
 706         }
 707 }
 708
 709 static void
 710 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 711                 int idx, char *buf, size_t size)
 712 {
 713         double diff;
 714         double ratio;
 715         s64 wdiff;
 716
 717         switch (idx) {
 718         case PERF_HPP_DIFF__DELTA:
 719                 if (pair->diff.computed)
 720                         diff = pair->diff.period_ratio_delta;
 721                 else
 722                         diff = perf_diff__compute_delta(he, pair);
 723
 724                 if (fabs(diff) >= 0.01)
 725                         scnprintf(buf, size, "%+4.2F%%", diff);
 726                 break;
 727
 728         case PERF_HPP_DIFF__RATIO:
 729                 /* No point for ratio number if we are dummy.. */
 730                 if (he->dummy)
 731                         break;
 732
 733                 if (pair->diff.computed)
 734                         ratio = pair->diff.period_ratio;
 735                 else
 736                         ratio = perf_diff__compute_ratio(he, pair);
 737
 738                 if (ratio > 0.0)
 739                         scnprintf(buf, size, "%14.6F", ratio);
 740                 break;
 741
 742         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 743                 /* No point for wdiff number if we are dummy.. */
 744                 if (he->dummy)
 745                         break;
 746
 747                 if (pair->diff.computed)
 748                         wdiff = pair->diff.wdiff;
 749                 else
 750                         wdiff = perf_diff__compute_wdiff(he, pair);
 751
 752                 if (wdiff != 0)
 753                         scnprintf(buf, size, "%14ld", wdiff);
 754                 break;
 755
 756         case PERF_HPP_DIFF__FORMULA:
 757                 perf_diff__formula(he, pair, buf, size);
 758                 break;
 759
 760         case PERF_HPP_DIFF__PERIOD:
 761                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
 762                 break;
 763
 764         default:
 765                 BUG_ON(1);
 766         };
 767 }
 768
 769 static void
 770 __hpp__entry_global(struct hist_entry *he, int idx, char *buf, size_t size)
 771 {
 772         struct hist_entry *pair = hist_entry__next_pair(he);
 773
 774         /* baseline is special */
 775         if (idx == PERF_HPP_DIFF__BASELINE)
 776                 hpp__entry_baseline(he, buf, size);
 777         else {
 778                 if (pair)
 779                         hpp__entry_pair(he, pair, idx, buf, size);
 780                 else
 781                         hpp__entry_unpair(he, idx, buf, size);
 782         }
 783 }
 784
 785 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
 786                              struct hist_entry *he)
 787 {
 788         struct diff_hpp_fmt *dfmt =
 789                 container_of(_fmt, struct diff_hpp_fmt, fmt);
 790         char buf[MAX_COL_WIDTH] = " ";
 791
 792         __hpp__entry_global(he, dfmt->idx, buf, MAX_COL_WIDTH);
 793
 794         if (symbol_conf.field_sep)
 795                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
 796         else
 797                 return scnprintf(hpp->buf, hpp->size, "%*s",
 798                                  dfmt->header_width, buf);
 799 }
 800
 801 static int hpp__header(struct perf_hpp_fmt *fmt,
 802                        struct perf_hpp *hpp)
 803 {
 804         struct diff_hpp_fmt *dfmt =
 805                 container_of(fmt, struct diff_hpp_fmt, fmt);
 806
 807         BUG_ON(!dfmt->header);
 808         return scnprintf(hpp->buf, hpp->size, dfmt->header);
 809 }
 810
 811 static int hpp__width(struct perf_hpp_fmt *fmt,
 812                       struct perf_hpp *hpp __maybe_unused)
 813 {
 814         struct diff_hpp_fmt *dfmt =
 815                 container_of(fmt, struct diff_hpp_fmt, fmt);
 816
 817         BUG_ON(dfmt->header_width <= 0);
 818         return dfmt->header_width;
 819 }
 820
 821 #define hpp__color_global hpp__entry_global
 822
 823 #define FMT(_i, _entry, _color)                                 \
 824         [_i] = {                                                \
 825                 .fmt = {                                        \
 826                         .header = hpp__header,                  \
 827                         .width  = hpp__width,                   \
 828                         .entry  = hpp__entry_ ## _entry,        \
 829                         .color  = hpp__color_ ## _color,        \
 830                 },                                              \
 831                 .idx = _i,                                      \
 832         }
 833
 834 #define FMT_GLOBAL(_i)   FMT(_i, global, global)
 835 #define FMT_BASELINE(_i) FMT(_i, global, baseline)
 836
 837 static struct diff_hpp_fmt diff_fmt[] = {
 838         FMT_BASELINE(PERF_HPP_DIFF__BASELINE),
 839         FMT_GLOBAL(PERF_HPP_DIFF__PERIOD),
 840         FMT_GLOBAL(PERF_HPP_DIFF__PERIOD_BASELINE),
 841         FMT_GLOBAL(PERF_HPP_DIFF__DELTA),
 842         FMT_GLOBAL(PERF_HPP_DIFF__RATIO),
 843         FMT_GLOBAL(PERF_HPP_DIFF__WEIGHTED_DIFF),
 844         FMT_GLOBAL(PERF_HPP_DIFF__FORMULA),
 845 };
 846
 847 static void init_header(struct diff_hpp_fmt *dfmt)
 848 {
 849 #define MAX_HEADER_NAME 100
 850         char buf_indent[MAX_HEADER_NAME];
 851         char buf[MAX_HEADER_NAME];
 852         const char *header = NULL;
 853         int width = 0;
 854
 855         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
 856         header = columns[dfmt->idx].name;
 857         width  = columns[dfmt->idx].width;
 858
 859         /* Only our defined HPP fmts should appear here. */
 860         BUG_ON(!header);
 861
 862 #define NAME (data__files_cnt > 2 ? buf : header)
 863         dfmt->header_width = width;
 864         width = (int) strlen(NAME);
 865         if (dfmt->header_width < width)
 866                 dfmt->header_width = width;
 867
 868         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
 869                   dfmt->header_width, NAME);
 870
 871         dfmt->header = strdup(buf_indent);
 872 #undef MAX_HEADER_NAME
 873 #undef NAME
 874 }
 875
 876 static void column_enable(unsigned col)
 877 {
 878         struct diff_hpp_fmt *dfmt;
 879
 880         BUG_ON(col >= PERF_HPP_DIFF__MAX_INDEX);
 881         dfmt = &diff_fmt[col];
 882         init_header(dfmt);
 883         perf_hpp__column_register(&dfmt->fmt);
 884 }
 885
 886 static void ui_init(void)
 887 {
 888         /*
 889          * Display baseline/delta/ratio/
 890          * formula/periods columns.
 891          */
 892         column_enable(PERF_HPP_DIFF__BASELINE);
 893         column_enable(compute_2_hpp[compute]);
 894
 895         if (show_formula)
 896                 column_enable(PERF_HPP_DIFF__FORMULA);
 897
 898         if (show_period) {
 899                 column_enable(PERF_HPP_DIFF__PERIOD);
 900                 column_enable(PERF_HPP_DIFF__PERIOD_BASELINE);
 901         }
 902 }
 903
 904 static int data_init(int argc, const char **argv)
 905 {
 906         struct data__file *d;
 907         static const char *defaults[] = {
 908                 "perf.data.old",
 909                 "perf.data",
 910         };
 911         int i;
 912
 913         data__files_cnt = 2;
 914
 915         if (argc) {
 916                 if (argc > 2)
 917                         usage_with_options(diff_usage, options);
 918                 if (argc == 2) {
 919                         defaults[0] = argv[0];
 920                         defaults[1] = argv[1];
 921                 } else
 922                         defaults[1] = argv[0];
 923         } else if (symbol_conf.default_guest_vmlinux_name ||
 924                    symbol_conf.default_guest_kallsyms) {
 925                 defaults[0] = "perf.data.host";
 926                 defaults[1] = "perf.data.guest";
 927         }
 928
 929         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
 930         if (!data__files)
 931                 return -ENOMEM;
 932
 933         data__for_each_file(i, d) {
 934                 d->file = defaults[i];
 935                 d->idx  = i;
 936         }
 937
 938         return 0;
 939 }
 940
 941 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
 942 {
 943         sort_order = diff__default_sort_order;
 944         argc = parse_options(argc, argv, options, diff_usage, 0);
 945
 946         if (symbol__init() < 0)
 947                 return -1;
 948
 949         if (data_init(argc, argv) < 0)
 950                 return -1;
 951
 952         ui_init();
 953
 954         if (setup_sorting() < 0)
 955                 usage_with_options(diff_usage, options);
 956
 957         setup_pager();
 958
 959         sort__setup_elide(NULL);
 960
 961         return __cmd_diff();
 962 }