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 = hists__total_period(he->hists);
 224
 225         return (period * 100.0) / total;
 226 }
 227
 228 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 229 {
 230         double old_percent = period_percent(he, he->stat.period);
 231         double new_percent = period_percent(pair, pair->stat.period);
 232
 233         pair->diff.period_ratio_delta = new_percent - old_percent;
 234         pair->diff.computed = true;
 235         return pair->diff.period_ratio_delta;
 236 }
 237
 238 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 239 {
 240         double old_period = he->stat.period ?: 1;
 241         double new_period = pair->stat.period;
 242
 243         pair->diff.computed = true;
 244         pair->diff.period_ratio = new_period / old_period;
 245         return pair->diff.period_ratio;
 246 }
 247
 248 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 249 {
 250         u64 old_period = he->stat.period;
 251         u64 new_period = pair->stat.period;
 252
 253         pair->diff.computed = true;
 254         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 255                            old_period * compute_wdiff_w1;
 256
 257         return pair->diff.wdiff;
 258 }
 259
 260 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 261                          char *buf, size_t size)
 262 {
 263         u64 he_total = he->hists->stats.total_period;
 264         u64 pair_total = pair->hists->stats.total_period;
 265
 266         if (symbol_conf.filter_relative) {
 267                 he_total = he->hists->stats.total_non_filtered_period;
 268                 pair_total = pair->hists->stats.total_non_filtered_period;
 269         }
 270         return scnprintf(buf, size,
 271                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 272                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 273                          pair->stat.period, pair_total,
 274                          he->stat.period, he_total);
 275 }
 276
 277 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 278                          char *buf, size_t size)
 279 {
 280         double old_period = he->stat.period;
 281         double new_period = pair->stat.period;
 282
 283         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 284 }
 285
 286 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 287                          char *buf, size_t size)
 288 {
 289         u64 old_period = he->stat.period;
 290         u64 new_period = pair->stat.period;
 291
 292         return scnprintf(buf, size,
 293                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 294                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 295 }
 296
 297 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 298                            char *buf, size_t size)
 299 {
 300         switch (compute) {
 301         case COMPUTE_DELTA:
 302                 return formula_delta(he, pair, buf, size);
 303         case COMPUTE_RATIO:
 304                 return formula_ratio(he, pair, buf, size);
 305         case COMPUTE_WEIGHTED_DIFF:
 306                 return formula_wdiff(he, pair, buf, size);
 307         default:
 308                 BUG_ON(1);
 309         }
 310
 311         return -1;
 312 }
 313
 314 static int hists__add_entry(struct hists *hists,
 315                             struct addr_location *al, u64 period,
 316                             u64 weight, u64 transaction)
 317 {
 318         if (__hists__add_entry(hists, al, NULL, NULL, NULL, period, weight,
 319                                transaction) != NULL)
 320                 return 0;
 321         return -ENOMEM;
 322 }
 323
 324 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
 325                                       union perf_event *event,
 326                                       struct perf_sample *sample,
 327                                       struct perf_evsel *evsel,
 328                                       struct machine *machine)
 329 {
 330         struct addr_location al;
 331
 332         if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
 333                 pr_warning("problem processing %d event, skipping it.\n",
 334                            event->header.type);
 335                 return -1;
 336         }
 337
 338         if (hists__add_entry(&evsel->hists, &al, sample->period,
 339                              sample->weight, sample->transaction)) {
 340                 pr_warning("problem incrementing symbol period, skipping event\n");
 341                 return -1;
 342         }
 343
 344         if (al.filtered == 0) {
 345                 evsel->hists.stats.total_non_filtered_period += sample->period;
 346                 evsel->hists.nr_non_filtered_entries++;
 347         }
 348         evsel->hists.stats.total_period += sample->period;
 349         return 0;
 350 }
 351
 352 static struct perf_tool tool = {
 353         .sample = diff__process_sample_event,
 354         .mmap   = perf_event__process_mmap,
 355         .comm   = perf_event__process_comm,
 356         .exit   = perf_event__process_exit,
 357         .fork   = perf_event__process_fork,
 358         .lost   = perf_event__process_lost,
 359         .ordered_samples = true,
 360         .ordering_requires_timestamps = true,
 361 };
 362
 363 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 364                                       struct perf_evlist *evlist)
 365 {
 366         struct perf_evsel *e;
 367
 368         evlist__for_each(evlist, e) {
 369                 if (perf_evsel__match2(evsel, e))
 370                         return e;
 371         }
 372
 373         return NULL;
 374 }
 375
 376 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 377 {
 378         struct perf_evsel *evsel;
 379
 380         evlist__for_each(evlist, evsel) {
 381                 struct hists *hists = &evsel->hists;
 382
 383                 hists__collapse_resort(hists, NULL);
 384         }
 385 }
 386
 387 static struct hist_entry*
 388 get_pair_data(struct hist_entry *he, struct data__file *d)
 389 {
 390         if (hist_entry__has_pairs(he)) {
 391                 struct hist_entry *pair;
 392
 393                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 394                         if (pair->hists == d->hists)
 395                                 return pair;
 396         }
 397
 398         return NULL;
 399 }
 400
 401 static struct hist_entry*
 402 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 403 {
 404         void *ptr = dfmt - dfmt->idx;
 405         struct data__file *d = container_of(ptr, struct data__file, fmt);
 406
 407         return get_pair_data(he, d);
 408 }
 409
 410 static void hists__baseline_only(struct hists *hists)
 411 {
 412         struct rb_root *root;
 413         struct rb_node *next;
 414
 415         if (sort__need_collapse)
 416                 root = &hists->entries_collapsed;
 417         else
 418                 root = hists->entries_in;
 419
 420         next = rb_first(root);
 421         while (next != NULL) {
 422                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 423
 424                 next = rb_next(&he->rb_node_in);
 425                 if (!hist_entry__next_pair(he)) {
 426                         rb_erase(&he->rb_node_in, root);
 427                         hist_entry__free(he);
 428                 }
 429         }
 430 }
 431
 432 static void hists__precompute(struct hists *hists)
 433 {
 434         struct rb_root *root;
 435         struct rb_node *next;
 436
 437         if (sort__need_collapse)
 438                 root = &hists->entries_collapsed;
 439         else
 440                 root = hists->entries_in;
 441
 442         next = rb_first(root);
 443         while (next != NULL) {
 444                 struct hist_entry *he, *pair;
 445
 446                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 447                 next = rb_next(&he->rb_node_in);
 448
 449                 pair = get_pair_data(he, &data__files[sort_compute]);
 450                 if (!pair)
 451                         continue;
 452
 453                 switch (compute) {
 454                 case COMPUTE_DELTA:
 455                         compute_delta(he, pair);
 456                         break;
 457                 case COMPUTE_RATIO:
 458                         compute_ratio(he, pair);
 459                         break;
 460                 case COMPUTE_WEIGHTED_DIFF:
 461                         compute_wdiff(he, pair);
 462                         break;
 463                 default:
 464                         BUG_ON(1);
 465                 }
 466         }
 467 }
 468
 469 static int64_t cmp_doubles(double l, double r)
 470 {
 471         if (l > r)
 472                 return -1;
 473         else if (l < r)
 474                 return 1;
 475         else
 476                 return 0;
 477 }
 478
 479 static int64_t
 480 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 481                         int c)
 482 {
 483         switch (c) {
 484         case COMPUTE_DELTA:
 485         {
 486                 double l = left->diff.period_ratio_delta;
 487                 double r = right->diff.period_ratio_delta;
 488
 489                 return cmp_doubles(l, r);
 490         }
 491         case COMPUTE_RATIO:
 492         {
 493                 double l = left->diff.period_ratio;
 494                 double r = right->diff.period_ratio;
 495
 496                 return cmp_doubles(l, r);
 497         }
 498         case COMPUTE_WEIGHTED_DIFF:
 499         {
 500                 s64 l = left->diff.wdiff;
 501                 s64 r = right->diff.wdiff;
 502
 503                 return r - l;
 504         }
 505         default:
 506                 BUG_ON(1);
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int64_t
 513 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 514                         int c)
 515 {
 516         bool pairs_left  = hist_entry__has_pairs(left);
 517         bool pairs_right = hist_entry__has_pairs(right);
 518         struct hist_entry *p_right, *p_left;
 519
 520         if (!pairs_left && !pairs_right)
 521                 return 0;
 522
 523         if (!pairs_left || !pairs_right)
 524                 return pairs_left ? -1 : 1;
 525
 526         p_left  = get_pair_data(left,  &data__files[sort_compute]);
 527         p_right = get_pair_data(right, &data__files[sort_compute]);
 528
 529         if (!p_left && !p_right)
 530                 return 0;
 531
 532         if (!p_left || !p_right)
 533                 return p_left ? -1 : 1;
 534
 535         /*
 536          * We have 2 entries of same kind, let's
 537          * make the data comparison.
 538          */
 539         return __hist_entry__cmp_compute(p_left, p_right, c);
 540 }
 541
 542 static void insert_hist_entry_by_compute(struct rb_root *root,
 543                                          struct hist_entry *he,
 544                                          int c)
 545 {
 546         struct rb_node **p = &root->rb_node;
 547         struct rb_node *parent = NULL;
 548         struct hist_entry *iter;
 549
 550         while (*p != NULL) {
 551                 parent = *p;
 552                 iter = rb_entry(parent, struct hist_entry, rb_node);
 553                 if (hist_entry__cmp_compute(he, iter, c) < 0)
 554                         p = &(*p)->rb_left;
 555                 else
 556                         p = &(*p)->rb_right;
 557         }
 558
 559         rb_link_node(&he->rb_node, parent, p);
 560         rb_insert_color(&he->rb_node, root);
 561 }
 562
 563 static void hists__compute_resort(struct hists *hists)
 564 {
 565         struct rb_root *root;
 566         struct rb_node *next;
 567
 568         if (sort__need_collapse)
 569                 root = &hists->entries_collapsed;
 570         else
 571                 root = hists->entries_in;
 572
 573         hists->entries = RB_ROOT;
 574         next = rb_first(root);
 575
 576         hists->nr_entries = 0;
 577         hists->nr_non_filtered_entries = 0;
 578         hists->stats.total_period = 0;
 579         hists->stats.total_non_filtered_period = 0;
 580         hists__reset_col_len(hists);
 581
 582         while (next != NULL) {
 583                 struct hist_entry *he;
 584
 585                 he = rb_entry(next, struct hist_entry, rb_node_in);
 586                 next = rb_next(&he->rb_node_in);
 587
 588                 insert_hist_entry_by_compute(&hists->entries, he, compute);
 589                 hists__inc_stats(hists, he);
 590         }
 591 }
 592
 593 static void hists__process(struct hists *hists)
 594 {
 595         if (show_baseline_only)
 596                 hists__baseline_only(hists);
 597
 598         if (sort_compute) {
 599                 hists__precompute(hists);
 600                 hists__compute_resort(hists);
 601         } else {
 602                 hists__output_resort(hists);
 603         }
 604
 605         hists__fprintf(hists, true, 0, 0, 0, stdout);
 606 }
 607
 608 static void data__fprintf(void)
 609 {
 610         struct data__file *d;
 611         int i;
 612
 613         fprintf(stdout, "# Data files:\n");
 614
 615         data__for_each_file(i, d)
 616                 fprintf(stdout, "#  [%d] %s %s\n",
 617                         d->idx, d->file.path,
 618                         !d->idx ? "(Baseline)" : "");
 619
 620         fprintf(stdout, "#\n");
 621 }
 622
 623 static void data_process(void)
 624 {
 625         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 626         struct perf_evsel *evsel_base;
 627         bool first = true;
 628
 629         evlist__for_each(evlist_base, evsel_base) {
 630                 struct data__file *d;
 631                 int i;
 632
 633                 data__for_each_file_new(i, d) {
 634                         struct perf_evlist *evlist = d->session->evlist;
 635                         struct perf_evsel *evsel;
 636
 637                         evsel = evsel_match(evsel_base, evlist);
 638                         if (!evsel)
 639                                 continue;
 640
 641                         d->hists = &evsel->hists;
 642
 643                         hists__match(&evsel_base->hists, &evsel->hists);
 644
 645                         if (!show_baseline_only)
 646                                 hists__link(&evsel_base->hists,
 647                                             &evsel->hists);
 648                 }
 649
 650                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 651                         perf_evsel__name(evsel_base));
 652
 653                 first = false;
 654
 655                 if (verbose || data__files_cnt > 2)
 656                         data__fprintf();
 657
 658                 hists__process(&evsel_base->hists);
 659         }
 660 }
 661
 662 static void data__free(struct data__file *d)
 663 {
 664         int col;
 665
 666         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 667                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 668
 669                 zfree(&fmt->header);
 670         }
 671 }
 672
 673 static int __cmd_diff(void)
 674 {
 675         struct data__file *d;
 676         int ret = -EINVAL, i;
 677
 678         data__for_each_file(i, d) {
 679                 d->session = perf_session__new(&d->file, false, &tool);
 680                 if (!d->session) {
 681                         pr_err("Failed to open %s\n", d->file.path);
 682                         ret = -ENOMEM;
 683                         goto out_delete;
 684                 }
 685
 686                 ret = perf_session__process_events(d->session, &tool);
 687                 if (ret) {
 688                         pr_err("Failed to process %s\n", d->file.path);
 689                         goto out_delete;
 690                 }
 691
 692                 perf_evlist__collapse_resort(d->session->evlist);
 693         }
 694
 695         data_process();
 696
 697  out_delete:
 698         data__for_each_file(i, d) {
 699                 if (d->session)
 700                         perf_session__delete(d->session);
 701
 702                 data__free(d);
 703         }
 704
 705         free(data__files);
 706         return ret;
 707 }
 708
 709 static const char * const diff_usage[] = {
 710         "perf diff [<options>] [old_file] [new_file]",
 711         NULL,
 712 };
 713
 714 static const struct option options[] = {
 715         OPT_INCR('v', "verbose", &verbose,
 716                     "be more verbose (show symbol address, etc)"),
 717         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 718                     "Show only items with match in baseline"),
 719         OPT_CALLBACK('c', "compute", &compute,
 720                      "delta,ratio,wdiff:w1,w2 (default delta)",
 721                      "Entries differential computation selection",
 722                      setup_compute),
 723         OPT_BOOLEAN('p', "period", &show_period,
 724                     "Show period values."),
 725         OPT_BOOLEAN('F', "formula", &show_formula,
 726                     "Show formula."),
 727         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 728                     "dump raw trace in ASCII"),
 729         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 730         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 731                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 732         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 733                    "only consider symbols in these dsos"),
 734         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 735                    "only consider symbols in these comms"),
 736         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 737                    "only consider these symbols"),
 738         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 739                    "sort by key(s): pid, comm, dso, symbol, parent"),
 740         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 741                    "separator for columns, no spaces will be added between "
 742                    "columns '.' is reserved."),
 743         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 744                     "Look for files with symbols relative to this directory"),
 745         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 746         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 747                      "How to display percentage of filtered entries", parse_filter_percentage),
 748         OPT_END()
 749 };
 750
 751 static double baseline_percent(struct hist_entry *he)
 752 {
 753         u64 total = hists__total_period(he->hists);
 754
 755         return 100.0 * he->stat.period / total;
 756 }
 757
 758 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 759                                struct perf_hpp *hpp, struct hist_entry *he)
 760 {
 761         struct diff_hpp_fmt *dfmt =
 762                 container_of(fmt, struct diff_hpp_fmt, fmt);
 763         double percent = baseline_percent(he);
 764         char pfmt[20] = " ";
 765
 766         if (!he->dummy) {
 767                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 768                 return percent_color_snprintf(hpp->buf, hpp->size,
 769                                               pfmt, percent);
 770         } else
 771                 return scnprintf(hpp->buf, hpp->size, "%*s",
 772                                  dfmt->header_width, pfmt);
 773 }
 774
 775 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 776 {
 777         double percent = baseline_percent(he);
 778         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 779         int ret = 0;
 780
 781         if (!he->dummy)
 782                 ret = scnprintf(buf, size, fmt, percent);
 783
 784         return ret;
 785 }
 786
 787 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 788                                 struct perf_hpp *hpp, struct hist_entry *he,
 789                                 int comparison_method)
 790 {
 791         struct diff_hpp_fmt *dfmt =
 792                 container_of(fmt, struct diff_hpp_fmt, fmt);
 793         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 794         double diff;
 795         s64 wdiff;
 796         char pfmt[20] = " ";
 797
 798         if (!pair)
 799                 goto dummy_print;
 800
 801         switch (comparison_method) {
 802         case COMPUTE_DELTA:
 803                 if (pair->diff.computed)
 804                         diff = pair->diff.period_ratio_delta;
 805                 else
 806                         diff = compute_delta(he, pair);
 807
 808                 if (fabs(diff) < 0.01)
 809                         goto dummy_print;
 810                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 811                 return percent_color_snprintf(hpp->buf, hpp->size,
 812                                         pfmt, diff);
 813         case COMPUTE_RATIO:
 814                 if (he->dummy)
 815                         goto dummy_print;
 816                 if (pair->diff.computed)
 817                         diff = pair->diff.period_ratio;
 818                 else
 819                         diff = compute_ratio(he, pair);
 820
 821                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 822                 return value_color_snprintf(hpp->buf, hpp->size,
 823                                         pfmt, diff);
 824         case COMPUTE_WEIGHTED_DIFF:
 825                 if (he->dummy)
 826                         goto dummy_print;
 827                 if (pair->diff.computed)
 828                         wdiff = pair->diff.wdiff;
 829                 else
 830                         wdiff = compute_wdiff(he, pair);
 831
 832                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 833                 return color_snprintf(hpp->buf, hpp->size,
 834                                 get_percent_color(wdiff),
 835                                 pfmt, wdiff);
 836         default:
 837                 BUG_ON(1);
 838         }
 839 dummy_print:
 840         return scnprintf(hpp->buf, hpp->size, "%*s",
 841                         dfmt->header_width, pfmt);
 842 }
 843
 844 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 845                         struct perf_hpp *hpp, struct hist_entry *he)
 846 {
 847         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 848 }
 849
 850 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 851                         struct perf_hpp *hpp, struct hist_entry *he)
 852 {
 853         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 854 }
 855
 856 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 857                         struct perf_hpp *hpp, struct hist_entry *he)
 858 {
 859         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 860 }
 861
 862 static void
 863 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 864 {
 865         switch (idx) {
 866         case PERF_HPP_DIFF__PERIOD_BASELINE:
 867                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 868                 break;
 869
 870         default:
 871                 break;
 872         }
 873 }
 874
 875 static void
 876 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 877                 int idx, char *buf, size_t size)
 878 {
 879         double diff;
 880         double ratio;
 881         s64 wdiff;
 882
 883         switch (idx) {
 884         case PERF_HPP_DIFF__DELTA:
 885                 if (pair->diff.computed)
 886                         diff = pair->diff.period_ratio_delta;
 887                 else
 888                         diff = compute_delta(he, pair);
 889
 890                 if (fabs(diff) >= 0.01)
 891                         scnprintf(buf, size, "%+4.2F%%", diff);
 892                 break;
 893
 894         case PERF_HPP_DIFF__RATIO:
 895                 /* No point for ratio number if we are dummy.. */
 896                 if (he->dummy)
 897                         break;
 898
 899                 if (pair->diff.computed)
 900                         ratio = pair->diff.period_ratio;
 901                 else
 902                         ratio = compute_ratio(he, pair);
 903
 904                 if (ratio > 0.0)
 905                         scnprintf(buf, size, "%14.6F", ratio);
 906                 break;
 907
 908         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 909                 /* No point for wdiff number if we are dummy.. */
 910                 if (he->dummy)
 911                         break;
 912
 913                 if (pair->diff.computed)
 914                         wdiff = pair->diff.wdiff;
 915                 else
 916                         wdiff = compute_wdiff(he, pair);
 917
 918                 if (wdiff != 0)
 919                         scnprintf(buf, size, "%14ld", wdiff);
 920                 break;
 921
 922         case PERF_HPP_DIFF__FORMULA:
 923                 formula_fprintf(he, pair, buf, size);
 924                 break;
 925
 926         case PERF_HPP_DIFF__PERIOD:
 927                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
 928                 break;
 929
 930         default:
 931                 BUG_ON(1);
 932         };
 933 }
 934
 935 static void
 936 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
 937                     char *buf, size_t size)
 938 {
 939         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 940         int idx = dfmt->idx;
 941
 942         /* baseline is special */
 943         if (idx == PERF_HPP_DIFF__BASELINE)
 944                 hpp__entry_baseline(he, buf, size);
 945         else {
 946                 if (pair)
 947                         hpp__entry_pair(he, pair, idx, buf, size);
 948                 else
 949                         hpp__entry_unpair(he, idx, buf, size);
 950         }
 951 }
 952
 953 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
 954                              struct hist_entry *he)
 955 {
 956         struct diff_hpp_fmt *dfmt =
 957                 container_of(_fmt, struct diff_hpp_fmt, fmt);
 958         char buf[MAX_COL_WIDTH] = " ";
 959
 960         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
 961
 962         if (symbol_conf.field_sep)
 963                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
 964         else
 965                 return scnprintf(hpp->buf, hpp->size, "%*s",
 966                                  dfmt->header_width, buf);
 967 }
 968
 969 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
 970                        struct perf_evsel *evsel __maybe_unused)
 971 {
 972         struct diff_hpp_fmt *dfmt =
 973                 container_of(fmt, struct diff_hpp_fmt, fmt);
 974
 975         BUG_ON(!dfmt->header);
 976         return scnprintf(hpp->buf, hpp->size, dfmt->header);
 977 }
 978
 979 static int hpp__width(struct perf_hpp_fmt *fmt,
 980                       struct perf_hpp *hpp __maybe_unused,
 981                       struct perf_evsel *evsel __maybe_unused)
 982 {
 983         struct diff_hpp_fmt *dfmt =
 984                 container_of(fmt, struct diff_hpp_fmt, fmt);
 985
 986         BUG_ON(dfmt->header_width <= 0);
 987         return dfmt->header_width;
 988 }
 989
 990 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
 991 {
 992 #define MAX_HEADER_NAME 100
 993         char buf_indent[MAX_HEADER_NAME];
 994         char buf[MAX_HEADER_NAME];
 995         const char *header = NULL;
 996         int width = 0;
 997
 998         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
 999         header = columns[dfmt->idx].name;
1000         width  = columns[dfmt->idx].width;
1001
1002         /* Only our defined HPP fmts should appear here. */
1003         BUG_ON(!header);
1004
1005         if (data__files_cnt > 2)
1006                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1007
1008 #define NAME (data__files_cnt > 2 ? buf : header)
1009         dfmt->header_width = width;
1010         width = (int) strlen(NAME);
1011         if (dfmt->header_width < width)
1012                 dfmt->header_width = width;
1013
1014         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1015                   dfmt->header_width, NAME);
1016
1017         dfmt->header = strdup(buf_indent);
1018 #undef MAX_HEADER_NAME
1019 #undef NAME
1020 }
1021
1022 static void data__hpp_register(struct data__file *d, int idx)
1023 {
1024         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1025         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1026
1027         dfmt->idx = idx;
1028
1029         fmt->header = hpp__header;
1030         fmt->width  = hpp__width;
1031         fmt->entry  = hpp__entry_global;
1032
1033         /* TODO more colors */
1034         switch (idx) {
1035         case PERF_HPP_DIFF__BASELINE:
1036                 fmt->color = hpp__color_baseline;
1037                 break;
1038         case PERF_HPP_DIFF__DELTA:
1039                 fmt->color = hpp__color_delta;
1040                 break;
1041         case PERF_HPP_DIFF__RATIO:
1042                 fmt->color = hpp__color_ratio;
1043                 break;
1044         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1045                 fmt->color = hpp__color_wdiff;
1046                 break;
1047         default:
1048                 break;
1049         }
1050
1051         init_header(d, dfmt);
1052         perf_hpp__column_register(fmt);
1053 }
1054
1055 static void ui_init(void)
1056 {
1057         struct data__file *d;
1058         int i;
1059
1060         data__for_each_file(i, d) {
1061
1062                 /*
1063                  * Baseline or compute realted columns:
1064                  *
1065                  *   PERF_HPP_DIFF__BASELINE
1066                  *   PERF_HPP_DIFF__DELTA
1067                  *   PERF_HPP_DIFF__RATIO
1068                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1069                  */
1070                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1071                                           PERF_HPP_DIFF__BASELINE);
1072
1073                 /*
1074                  * And the rest:
1075                  *
1076                  * PERF_HPP_DIFF__FORMULA
1077                  * PERF_HPP_DIFF__PERIOD
1078                  * PERF_HPP_DIFF__PERIOD_BASELINE
1079                  */
1080                 if (show_formula && i)
1081                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1082
1083                 if (show_period)
1084                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1085                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1086         }
1087 }
1088
1089 static int data_init(int argc, const char **argv)
1090 {
1091         struct data__file *d;
1092         static const char *defaults[] = {
1093                 "perf.data.old",
1094                 "perf.data",
1095         };
1096         bool use_default = true;
1097         int i;
1098
1099         data__files_cnt = 2;
1100
1101         if (argc) {
1102                 if (argc == 1)
1103                         defaults[1] = argv[0];
1104                 else {
1105                         data__files_cnt = argc;
1106                         use_default = false;
1107                 }
1108         } else if (perf_guest) {
1109                 defaults[0] = "perf.data.host";
1110                 defaults[1] = "perf.data.guest";
1111         }
1112
1113         if (sort_compute >= (unsigned int) data__files_cnt) {
1114                 pr_err("Order option out of limit.\n");
1115                 return -EINVAL;
1116         }
1117
1118         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1119         if (!data__files)
1120                 return -ENOMEM;
1121
1122         data__for_each_file(i, d) {
1123                 struct perf_data_file *file = &d->file;
1124
1125                 file->path  = use_default ? defaults[i] : argv[i];
1126                 file->mode  = PERF_DATA_MODE_READ,
1127                 file->force = force,
1128
1129                 d->idx  = i;
1130         }
1131
1132         return 0;
1133 }
1134
1135 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1136 {
1137         perf_config(perf_default_config, NULL);
1138
1139         sort_order = diff__default_sort_order;
1140         argc = parse_options(argc, argv, options, diff_usage, 0);
1141
1142         if (symbol__init() < 0)
1143                 return -1;
1144
1145         if (data_init(argc, argv) < 0)
1146                 return -1;
1147
1148         ui_init();
1149
1150         if (setup_sorting() < 0)
1151                 usage_with_options(diff_usage, options);
1152
1153         setup_pager();
1154
1155         sort__setup_elide(NULL);
1156
1157         return __cmd_diff();
1158 }