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