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 #include "util/data.h"
  20
  21 #include <stdlib.h>
  22 #include <math.h>
  23
  24 /* Diff command specific HPP columns. */
  25 enum {
  26         PERF_HPP_DIFF__BASELINE,
  27         PERF_HPP_DIFF__PERIOD,
  28         PERF_HPP_DIFF__PERIOD_BASELINE,
  29         PERF_HPP_DIFF__DELTA,
  30         PERF_HPP_DIFF__RATIO,
  31         PERF_HPP_DIFF__WEIGHTED_DIFF,
  32         PERF_HPP_DIFF__FORMULA,
  33
  34         PERF_HPP_DIFF__MAX_INDEX
  35 };
  36
  37 struct diff_hpp_fmt {
  38         struct perf_hpp_fmt      fmt;
  39         int                      idx;
  40         char                    *header;
  41         int                      header_width;
  42 };
  43
  44 struct data__file {
  45         struct perf_session     *session;
  46         struct perf_data_file   file;
  47         int                      idx;
  48         struct hists            *hists;
  49         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
  50 };
  51
  52 static struct data__file *data__files;
  53 static int data__files_cnt;
  54
  55 #define data__for_each_file_start(i, d, s)      \
  56         for (i = s, d = &data__files[s];        \
  57              i < data__files_cnt;               \
  58              i++, d = &data__files[i])
  59
  60 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  61 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
  62
  63 static char diff__default_sort_order[] = "dso,symbol";
  64 static bool force;
  65 static bool show_period;
  66 static bool show_formula;
  67 static bool show_baseline_only;
  68 static unsigned int sort_compute;
  69
  70 static s64 compute_wdiff_w1;
  71 static s64 compute_wdiff_w2;
  72
  73 enum {
  74         COMPUTE_DELTA,
  75         COMPUTE_RATIO,
  76         COMPUTE_WEIGHTED_DIFF,
  77         COMPUTE_MAX,
  78 };
  79
  80 const char *compute_names[COMPUTE_MAX] = {
  81         [COMPUTE_DELTA] = "delta",
  82         [COMPUTE_RATIO] = "ratio",
  83         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
  84 };
  85
  86 static int compute;
  87
  88 static int compute_2_hpp[COMPUTE_MAX] = {
  89         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
  90         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
  91         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
  92 };
  93
  94 #define MAX_COL_WIDTH 70
  95
  96 static struct header_column {
  97         const char *name;
  98         int width;
  99 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
 100         [PERF_HPP_DIFF__BASELINE] = {
 101                 .name  = "Baseline",
 102         },
 103         [PERF_HPP_DIFF__PERIOD] = {
 104                 .name  = "Period",
 105                 .width = 14,
 106         },
 107         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
 108                 .name  = "Base period",
 109                 .width = 14,
 110         },
 111         [PERF_HPP_DIFF__DELTA] = {
 112                 .name  = "Delta",
 113                 .width = 7,
 114         },
 115         [PERF_HPP_DIFF__RATIO] = {
 116                 .name  = "Ratio",
 117                 .width = 14,
 118         },
 119         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 120                 .name  = "Weighted diff",
 121                 .width = 14,
 122         },
 123         [PERF_HPP_DIFF__FORMULA] = {
 124                 .name  = "Formula",
 125                 .width = MAX_COL_WIDTH,
 126         }
 127 };
 128
 129 static int setup_compute_opt_wdiff(char *opt)
 130 {
 131         char *w1_str = opt;
 132         char *w2_str;
 133
 134         int ret = -EINVAL;
 135
 136         if (!opt)
 137                 goto out;
 138
 139         w2_str = strchr(opt, ',');
 140         if (!w2_str)
 141                 goto out;
 142
 143         *w2_str++ = 0x0;
 144         if (!*w2_str)
 145                 goto out;
 146
 147         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 148         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 149
 150         if (!compute_wdiff_w1 || !compute_wdiff_w2)
 151                 goto out;
 152
 153         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 154                   compute_wdiff_w1, compute_wdiff_w2);
 155
 156         ret = 0;
 157
 158  out:
 159         if (ret)
 160                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 161
 162         return ret;
 163 }
 164
 165 static int setup_compute_opt(char *opt)
 166 {
 167         if (compute == COMPUTE_WEIGHTED_DIFF)
 168                 return setup_compute_opt_wdiff(opt);
 169
 170         if (opt) {
 171                 pr_err("Failed: extra option specified '%s'", opt);
 172                 return -EINVAL;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int setup_compute(const struct option *opt, const char *str,
 179                          int unset __maybe_unused)
 180 {
 181         int *cp = (int *) opt->value;
 182         char *cstr = (char *) str;
 183         char buf[50];
 184         unsigned i;
 185         char *option;
 186
 187         if (!str) {
 188                 *cp = COMPUTE_DELTA;
 189                 return 0;
 190         }
 191
 192         option = strchr(str, ':');
 193         if (option) {
 194                 unsigned len = option++ - str;
 195
 196                 /*
 197                  * The str data are not writeable, so we need
 198                  * to use another buffer.
 199                  */
 200
 201                 /* No option value is longer. */
 202                 if (len >= sizeof(buf))
 203                         return -EINVAL;
 204
 205                 strncpy(buf, str, len);
 206                 buf[len] = 0x0;
 207                 cstr = buf;
 208         }
 209
 210         for (i = 0; i < COMPUTE_MAX; i++)
 211                 if (!strcmp(cstr, compute_names[i])) {
 212                         *cp = i;
 213                         return setup_compute_opt(option);
 214                 }
 215
 216         pr_err("Failed: '%s' is not computation method "
 217                "(use 'delta','ratio' or 'wdiff')\n", str);
 218         return -EINVAL;
 219 }
 220
 221 static double period_percent(struct hist_entry *he, u64 period)
 222 {
 223         u64 total = he->hists->stats.total_period;
 224         return (period * 100.0) / total;
 225 }
 226
 227 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 228 {
 229         double old_percent = period_percent(he, he->stat.period);
 230         double new_percent = period_percent(pair, pair->stat.period);
 231
 232         pair->diff.period_ratio_delta = new_percent - old_percent;
 233         pair->diff.computed = true;
 234         return pair->diff.period_ratio_delta;
 235 }
 236
 237 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 238 {
 239         double old_period = he->stat.period ?: 1;
 240         double new_period = pair->stat.period;
 241
 242         pair->diff.computed = true;
 243         pair->diff.period_ratio = new_period / old_period;
 244         return pair->diff.period_ratio;
 245 }
 246
 247 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 248 {
 249         u64 old_period = he->stat.period;
 250         u64 new_period = pair->stat.period;
 251
 252         pair->diff.computed = true;
 253         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 254                            old_period * compute_wdiff_w1;
 255
 256         return pair->diff.wdiff;
 257 }
 258
 259 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 260                          char *buf, size_t size)
 261 {
 262         return scnprintf(buf, size,
 263                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 264                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 265                           pair->stat.period, pair->hists->stats.total_period,
 266                           he->stat.period, he->hists->stats.total_period);
 267 }
 268
 269 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 270                          char *buf, size_t size)
 271 {
 272         double old_period = he->stat.period;
 273         double new_period = pair->stat.period;
 274
 275         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 276 }
 277
 278 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 279                          char *buf, size_t size)
 280 {
 281         u64 old_period = he->stat.period;
 282         u64 new_period = pair->stat.period;
 283
 284         return scnprintf(buf, size,
 285                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 286                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 287 }
 288
 289 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 290                            char *buf, size_t size)
 291 {
 292         switch (compute) {
 293         case COMPUTE_DELTA:
 294                 return formula_delta(he, pair, buf, size);
 295         case COMPUTE_RATIO:
 296                 return formula_ratio(he, pair, buf, size);
 297         case COMPUTE_WEIGHTED_DIFF:
 298                 return formula_wdiff(he, pair, buf, size);
 299         default:
 300                 BUG_ON(1);
 301         }
 302
 303         return -1;
 304 }
 305
 306 static int hists__add_entry(struct hists *hists,
 307                             struct addr_location *al, u64 period,
 308                             u64 weight, u64 transaction)
 309 {
 310         if (__hists__add_entry(hists, al, NULL, period, weight, transaction) != NULL)
 311                 return 0;
 312         return -ENOMEM;
 313 }
 314
 315 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
 316                                       union perf_event *event,
 317                                       struct perf_sample *sample,
 318                                       struct perf_evsel *evsel,
 319                                       struct machine *machine)
 320 {
 321         struct addr_location al;
 322
 323         if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
 324                 pr_warning("problem processing %d event, skipping it.\n",
 325                            event->header.type);
 326                 return -1;
 327         }
 328
 329         if (al.filtered)
 330                 return 0;
 331
 332         if (hists__add_entry(&evsel->hists, &al, sample->period,
 333                              sample->weight, sample->transaction)) {
 334                 pr_warning("problem incrementing symbol period, skipping event\n");
 335                 return -1;
 336         }
 337
 338         evsel->hists.stats.total_period += sample->period;
 339         return 0;
 340 }
 341
 342 static struct perf_tool tool = {
 343         .sample = diff__process_sample_event,
 344         .mmap   = perf_event__process_mmap,
 345         .comm   = perf_event__process_comm,
 346         .exit   = perf_event__process_exit,
 347         .fork   = perf_event__process_fork,
 348         .lost   = perf_event__process_lost,
 349         .ordered_samples = true,
 350         .ordering_requires_timestamps = true,
 351 };
 352
 353 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 354                                       struct perf_evlist *evlist)
 355 {
 356         struct perf_evsel *e;
 357
 358         list_for_each_entry(e, &evlist->entries, node)
 359                 if (perf_evsel__match2(evsel, e))
 360                         return e;
 361
 362         return NULL;
 363 }
 364
 365 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 366 {
 367         struct perf_evsel *evsel;
 368
 369         list_for_each_entry(evsel, &evlist->entries, node) {
 370                 struct hists *hists = &evsel->hists;
 371
 372                 hists__collapse_resort(hists, NULL);
 373         }
 374 }
 375
 376 static struct hist_entry*
 377 get_pair_data(struct hist_entry *he, struct data__file *d)
 378 {
 379         if (hist_entry__has_pairs(he)) {
 380                 struct hist_entry *pair;
 381
 382                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 383                         if (pair->hists == d->hists)
 384                                 return pair;
 385         }
 386
 387         return NULL;
 388 }
 389
 390 static struct hist_entry*
 391 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 392 {
 393         void *ptr = dfmt - dfmt->idx;
 394         struct data__file *d = container_of(ptr, struct data__file, fmt);
 395
 396         return get_pair_data(he, d);
 397 }
 398
 399 static void hists__baseline_only(struct hists *hists)
 400 {
 401         struct rb_root *root;
 402         struct rb_node *next;
 403
 404         if (sort__need_collapse)
 405                 root = &hists->entries_collapsed;
 406         else
 407                 root = hists->entries_in;
 408
 409         next = rb_first(root);
 410         while (next != NULL) {
 411                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 412
 413                 next = rb_next(&he->rb_node_in);
 414                 if (!hist_entry__next_pair(he)) {
 415                         rb_erase(&he->rb_node_in, root);
 416                         hist_entry__free(he);
 417                 }
 418         }
 419 }
 420
 421 static void hists__precompute(struct hists *hists)
 422 {
 423         struct rb_root *root;
 424         struct rb_node *next;
 425
 426         if (sort__need_collapse)
 427                 root = &hists->entries_collapsed;
 428         else
 429                 root = hists->entries_in;
 430
 431         next = rb_first(root);
 432         while (next != NULL) {
 433                 struct hist_entry *he, *pair;
 434
 435                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 436                 next = rb_next(&he->rb_node_in);
 437
 438                 pair = get_pair_data(he, &data__files[sort_compute]);
 439                 if (!pair)
 440                         continue;
 441
 442                 switch (compute) {
 443                 case COMPUTE_DELTA:
 444                         compute_delta(he, pair);
 445                         break;
 446                 case COMPUTE_RATIO:
 447                         compute_ratio(he, pair);
 448                         break;
 449                 case COMPUTE_WEIGHTED_DIFF:
 450                         compute_wdiff(he, pair);
 451                         break;
 452                 default:
 453                         BUG_ON(1);
 454                 }
 455         }
 456 }
 457
 458 static int64_t cmp_doubles(double l, double r)
 459 {
 460         if (l > r)
 461                 return -1;
 462         else if (l < r)
 463                 return 1;
 464         else
 465                 return 0;
 466 }
 467
 468 static int64_t
 469 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 470                         int c)
 471 {
 472         switch (c) {
 473         case COMPUTE_DELTA:
 474         {
 475                 double l = left->diff.period_ratio_delta;
 476                 double r = right->diff.period_ratio_delta;
 477
 478                 return cmp_doubles(l, r);
 479         }
 480         case COMPUTE_RATIO:
 481         {
 482                 double l = left->diff.period_ratio;
 483                 double r = right->diff.period_ratio;
 484
 485                 return cmp_doubles(l, r);
 486         }
 487         case COMPUTE_WEIGHTED_DIFF:
 488         {
 489                 s64 l = left->diff.wdiff;
 490                 s64 r = right->diff.wdiff;
 491
 492                 return r - l;
 493         }
 494         default:
 495                 BUG_ON(1);
 496         }
 497
 498         return 0;
 499 }
 500
 501 static int64_t
 502 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 503                         int c)
 504 {
 505         bool pairs_left  = hist_entry__has_pairs(left);
 506         bool pairs_right = hist_entry__has_pairs(right);
 507         struct hist_entry *p_right, *p_left;
 508
 509         if (!pairs_left && !pairs_right)
 510                 return 0;
 511
 512         if (!pairs_left || !pairs_right)
 513                 return pairs_left ? -1 : 1;
 514
 515         p_left  = get_pair_data(left,  &data__files[sort_compute]);
 516         p_right = get_pair_data(right, &data__files[sort_compute]);
 517
 518         if (!p_left && !p_right)
 519                 return 0;
 520
 521         if (!p_left || !p_right)
 522                 return p_left ? -1 : 1;
 523
 524         /*
 525          * We have 2 entries of same kind, let's
 526          * make the data comparison.
 527          */
 528         return __hist_entry__cmp_compute(p_left, p_right, c);
 529 }
 530
 531 static void insert_hist_entry_by_compute(struct rb_root *root,
 532                                          struct hist_entry *he,
 533                                          int c)
 534 {
 535         struct rb_node **p = &root->rb_node;
 536         struct rb_node *parent = NULL;
 537         struct hist_entry *iter;
 538
 539         while (*p != NULL) {
 540                 parent = *p;
 541                 iter = rb_entry(parent, struct hist_entry, rb_node);
 542                 if (hist_entry__cmp_compute(he, iter, c) < 0)
 543                         p = &(*p)->rb_left;
 544                 else
 545                         p = &(*p)->rb_right;
 546         }
 547
 548         rb_link_node(&he->rb_node, parent, p);
 549         rb_insert_color(&he->rb_node, root);
 550 }
 551
 552 static void hists__compute_resort(struct hists *hists)
 553 {
 554         struct rb_root *root;
 555         struct rb_node *next;
 556
 557         if (sort__need_collapse)
 558                 root = &hists->entries_collapsed;
 559         else
 560                 root = hists->entries_in;
 561
 562         hists->entries = RB_ROOT;
 563         next = rb_first(root);
 564
 565         hists->nr_entries = 0;
 566         hists->stats.total_period = 0;
 567         hists__reset_col_len(hists);
 568
 569         while (next != NULL) {
 570                 struct hist_entry *he;
 571
 572                 he = rb_entry(next, struct hist_entry, rb_node_in);
 573                 next = rb_next(&he->rb_node_in);
 574
 575                 insert_hist_entry_by_compute(&hists->entries, he, compute);
 576                 hists__inc_nr_entries(hists, he);
 577         }
 578 }
 579
 580 static void hists__process(struct hists *hists)
 581 {
 582         if (show_baseline_only)
 583                 hists__baseline_only(hists);
 584
 585         if (sort_compute) {
 586                 hists__precompute(hists);
 587                 hists__compute_resort(hists);
 588         } else {
 589                 hists__output_resort(hists);
 590         }
 591
 592         hists__fprintf(hists, true, 0, 0, 0, stdout);
 593 }
 594
 595 static void data__fprintf(void)
 596 {
 597         struct data__file *d;
 598         int i;
 599
 600         fprintf(stdout, "# Data files:\n");
 601
 602         data__for_each_file(i, d)
 603                 fprintf(stdout, "#  [%d] %s %s\n",
 604                         d->idx, d->file.path,
 605                         !d->idx ? "(Baseline)" : "");
 606
 607         fprintf(stdout, "#\n");
 608 }
 609
 610 static void data_process(void)
 611 {
 612         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 613         struct perf_evsel *evsel_base;
 614         bool first = true;
 615
 616         list_for_each_entry(evsel_base, &evlist_base->entries, node) {
 617                 struct data__file *d;
 618                 int i;
 619
 620                 data__for_each_file_new(i, d) {
 621                         struct perf_evlist *evlist = d->session->evlist;
 622                         struct perf_evsel *evsel;
 623
 624                         evsel = evsel_match(evsel_base, evlist);
 625                         if (!evsel)
 626                                 continue;
 627
 628                         d->hists = &evsel->hists;
 629
 630                         hists__match(&evsel_base->hists, &evsel->hists);
 631
 632                         if (!show_baseline_only)
 633                                 hists__link(&evsel_base->hists,
 634                                             &evsel->hists);
 635                 }
 636
 637                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 638                         perf_evsel__name(evsel_base));
 639
 640                 first = false;
 641
 642                 if (verbose || data__files_cnt > 2)
 643                         data__fprintf();
 644
 645                 hists__process(&evsel_base->hists);
 646         }
 647 }
 648
 649 static void data__free(struct data__file *d)
 650 {
 651         int col;
 652
 653         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 654                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 655
 656                 free(fmt->header);
 657         }
 658 }
 659
 660 static int __cmd_diff(void)
 661 {
 662         struct data__file *d;
 663         int ret = -EINVAL, i;
 664
 665         data__for_each_file(i, d) {
 666                 d->session = perf_session__new(&d->file, false, &tool);
 667                 if (!d->session) {
 668                         pr_err("Failed to open %s\n", d->file.path);
 669                         ret = -ENOMEM;
 670                         goto out_delete;
 671                 }
 672
 673                 ret = perf_session__process_events(d->session, &tool);
 674                 if (ret) {
 675                         pr_err("Failed to process %s\n", d->file.path);
 676                         goto out_delete;
 677                 }
 678
 679                 perf_evlist__collapse_resort(d->session->evlist);
 680         }
 681
 682         data_process();
 683
 684  out_delete:
 685         data__for_each_file(i, d) {
 686                 if (d->session)
 687                         perf_session__delete(d->session);
 688
 689                 data__free(d);
 690         }
 691
 692         free(data__files);
 693         return ret;
 694 }
 695
 696 static const char * const diff_usage[] = {
 697         "perf diff [<options>] [old_file] [new_file]",
 698         NULL,
 699 };
 700
 701 static const struct option options[] = {
 702         OPT_INCR('v', "verbose", &verbose,
 703                     "be more verbose (show symbol address, etc)"),
 704         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 705                     "Show only items with match in baseline"),
 706         OPT_CALLBACK('c', "compute", &compute,
 707                      "delta,ratio,wdiff:w1,w2 (default delta)",
 708                      "Entries differential computation selection",
 709                      setup_compute),
 710         OPT_BOOLEAN('p', "period", &show_period,
 711                     "Show period values."),
 712         OPT_BOOLEAN('F', "formula", &show_formula,
 713                     "Show formula."),
 714         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 715                     "dump raw trace in ASCII"),
 716         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 717         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 718                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 719         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 720                    "only consider symbols in these dsos"),
 721         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 722                    "only consider symbols in these comms"),
 723         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 724                    "only consider these symbols"),
 725         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 726                    "sort by key(s): pid, comm, dso, symbol, parent"),
 727         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 728                    "separator for columns, no spaces will be added between "
 729                    "columns '.' is reserved."),
 730         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 731                     "Look for files with symbols relative to this directory"),
 732         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 733         OPT_END()
 734 };
 735
 736 static double baseline_percent(struct hist_entry *he)
 737 {
 738         struct hists *hists = he->hists;
 739         return 100.0 * he->stat.period / hists->stats.total_period;
 740 }
 741
 742 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 743                                struct perf_hpp *hpp, struct hist_entry *he)
 744 {
 745         struct diff_hpp_fmt *dfmt =
 746                 container_of(fmt, struct diff_hpp_fmt, fmt);
 747         double percent = baseline_percent(he);
 748         char pfmt[20] = " ";
 749
 750         if (!he->dummy) {
 751                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 752                 return percent_color_snprintf(hpp->buf, hpp->size,
 753                                               pfmt, percent);
 754         } else
 755                 return scnprintf(hpp->buf, hpp->size, "%*s",
 756                                  dfmt->header_width, pfmt);
 757 }
 758
 759 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 760 {
 761         double percent = baseline_percent(he);
 762         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 763         int ret = 0;
 764
 765         if (!he->dummy)
 766                 ret = scnprintf(buf, size, fmt, percent);
 767
 768         return ret;
 769 }
 770
 771 static void
 772 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 773 {
 774         switch (idx) {
 775         case PERF_HPP_DIFF__PERIOD_BASELINE:
 776                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 777                 break;
 778
 779         default:
 780                 break;
 781         }
 782 }
 783
 784 static void
 785 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 786                 int idx, char *buf, size_t size)
 787 {
 788         double diff;
 789         double ratio;
 790         s64 wdiff;
 791
 792         switch (idx) {
 793         case PERF_HPP_DIFF__DELTA:
 794                 if (pair->diff.computed)
 795                         diff = pair->diff.period_ratio_delta;
 796                 else
 797                         diff = compute_delta(he, pair);
 798
 799                 if (fabs(diff) >= 0.01)
 800                         scnprintf(buf, size, "%+4.2F%%", diff);
 801                 break;
 802
 803         case PERF_HPP_DIFF__RATIO:
 804                 /* No point for ratio number if we are dummy.. */
 805                 if (he->dummy)
 806                         break;
 807
 808                 if (pair->diff.computed)
 809                         ratio = pair->diff.period_ratio;
 810                 else
 811                         ratio = compute_ratio(he, pair);
 812
 813                 if (ratio > 0.0)
 814                         scnprintf(buf, size, "%14.6F", ratio);
 815                 break;
 816
 817         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 818                 /* No point for wdiff number if we are dummy.. */
 819                 if (he->dummy)
 820                         break;
 821
 822                 if (pair->diff.computed)
 823                         wdiff = pair->diff.wdiff;
 824                 else
 825                         wdiff = compute_wdiff(he, pair);
 826
 827                 if (wdiff != 0)
 828                         scnprintf(buf, size, "%14ld", wdiff);
 829                 break;
 830
 831         case PERF_HPP_DIFF__FORMULA:
 832                 formula_fprintf(he, pair, buf, size);
 833                 break;
 834
 835         case PERF_HPP_DIFF__PERIOD:
 836                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
 837                 break;
 838
 839         default:
 840                 BUG_ON(1);
 841         };
 842 }
 843
 844 static void
 845 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
 846                     char *buf, size_t size)
 847 {
 848         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 849         int idx = dfmt->idx;
 850
 851         /* baseline is special */
 852         if (idx == PERF_HPP_DIFF__BASELINE)
 853                 hpp__entry_baseline(he, buf, size);
 854         else {
 855                 if (pair)
 856                         hpp__entry_pair(he, pair, idx, buf, size);
 857                 else
 858                         hpp__entry_unpair(he, idx, buf, size);
 859         }
 860 }
 861
 862 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
 863                              struct hist_entry *he)
 864 {
 865         struct diff_hpp_fmt *dfmt =
 866                 container_of(_fmt, struct diff_hpp_fmt, fmt);
 867         char buf[MAX_COL_WIDTH] = " ";
 868
 869         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
 870
 871         if (symbol_conf.field_sep)
 872                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
 873         else
 874                 return scnprintf(hpp->buf, hpp->size, "%*s",
 875                                  dfmt->header_width, buf);
 876 }
 877
 878 static int hpp__header(struct perf_hpp_fmt *fmt,
 879                        struct perf_hpp *hpp)
 880 {
 881         struct diff_hpp_fmt *dfmt =
 882                 container_of(fmt, struct diff_hpp_fmt, fmt);
 883
 884         BUG_ON(!dfmt->header);
 885         return scnprintf(hpp->buf, hpp->size, dfmt->header);
 886 }
 887
 888 static int hpp__width(struct perf_hpp_fmt *fmt,
 889                       struct perf_hpp *hpp __maybe_unused)
 890 {
 891         struct diff_hpp_fmt *dfmt =
 892                 container_of(fmt, struct diff_hpp_fmt, fmt);
 893
 894         BUG_ON(dfmt->header_width <= 0);
 895         return dfmt->header_width;
 896 }
 897
 898 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
 899 {
 900 #define MAX_HEADER_NAME 100
 901         char buf_indent[MAX_HEADER_NAME];
 902         char buf[MAX_HEADER_NAME];
 903         const char *header = NULL;
 904         int width = 0;
 905
 906         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
 907         header = columns[dfmt->idx].name;
 908         width  = columns[dfmt->idx].width;
 909
 910         /* Only our defined HPP fmts should appear here. */
 911         BUG_ON(!header);
 912
 913         if (data__files_cnt > 2)
 914                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
 915
 916 #define NAME (data__files_cnt > 2 ? buf : header)
 917         dfmt->header_width = width;
 918         width = (int) strlen(NAME);
 919         if (dfmt->header_width < width)
 920                 dfmt->header_width = width;
 921
 922         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
 923                   dfmt->header_width, NAME);
 924
 925         dfmt->header = strdup(buf_indent);
 926 #undef MAX_HEADER_NAME
 927 #undef NAME
 928 }
 929
 930 static void data__hpp_register(struct data__file *d, int idx)
 931 {
 932         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
 933         struct perf_hpp_fmt *fmt = &dfmt->fmt;
 934
 935         dfmt->idx = idx;
 936
 937         fmt->header = hpp__header;
 938         fmt->width  = hpp__width;
 939         fmt->entry  = hpp__entry_global;
 940
 941         /* TODO more colors */
 942         if (idx == PERF_HPP_DIFF__BASELINE)
 943                 fmt->color = hpp__color_baseline;
 944
 945         init_header(d, dfmt);
 946         perf_hpp__column_register(fmt);
 947 }
 948
 949 static void ui_init(void)
 950 {
 951         struct data__file *d;
 952         int i;
 953
 954         data__for_each_file(i, d) {
 955
 956                 /*
 957                  * Baseline or compute realted columns:
 958                  *
 959                  *   PERF_HPP_DIFF__BASELINE
 960                  *   PERF_HPP_DIFF__DELTA
 961                  *   PERF_HPP_DIFF__RATIO
 962                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
 963                  */
 964                 data__hpp_register(d, i ? compute_2_hpp[compute] :
 965                                           PERF_HPP_DIFF__BASELINE);
 966
 967                 /*
 968                  * And the rest:
 969                  *
 970                  * PERF_HPP_DIFF__FORMULA
 971                  * PERF_HPP_DIFF__PERIOD
 972                  * PERF_HPP_DIFF__PERIOD_BASELINE
 973                  */
 974                 if (show_formula && i)
 975                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
 976
 977                 if (show_period)
 978                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
 979                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
 980         }
 981 }
 982
 983 static int data_init(int argc, const char **argv)
 984 {
 985         struct data__file *d;
 986         static const char *defaults[] = {
 987                 "perf.data.old",
 988                 "perf.data",
 989         };
 990         bool use_default = true;
 991         int i;
 992
 993         data__files_cnt = 2;
 994
 995         if (argc) {
 996                 if (argc == 1)
 997                         defaults[1] = argv[0];
 998                 else {
 999                         data__files_cnt = argc;
1000                         use_default = false;
1001                 }
1002         } else if (symbol_conf.default_guest_vmlinux_name ||
1003                    symbol_conf.default_guest_kallsyms) {
1004                 defaults[0] = "perf.data.host";
1005                 defaults[1] = "perf.data.guest";
1006         }
1007
1008         if (sort_compute >= (unsigned int) data__files_cnt) {
1009                 pr_err("Order option out of limit.\n");
1010                 return -EINVAL;
1011         }
1012
1013         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1014         if (!data__files)
1015                 return -ENOMEM;
1016
1017         data__for_each_file(i, d) {
1018                 struct perf_data_file *file = &d->file;
1019
1020                 file->path  = use_default ? defaults[i] : argv[i];
1021                 file->mode  = PERF_DATA_MODE_READ,
1022                 file->force = force,
1023
1024                 d->idx  = i;
1025         }
1026
1027         return 0;
1028 }
1029
1030 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1031 {
1032         sort_order = diff__default_sort_order;
1033         argc = parse_options(argc, argv, options, diff_usage, 0);
1034
1035         if (symbol__init() < 0)
1036                 return -1;
1037
1038         if (data_init(argc, argv) < 0)
1039                 return -1;
1040
1041         ui_init();
1042
1043         if (setup_sorting() < 0)
1044                 usage_with_options(diff_usage, options);
1045
1046         setup_pager();
1047
1048         sort__setup_elide(NULL);
1049
1050         return __cmd_diff();
1051 }