tools/perf/builtin-diff.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * builtin-diff.c
   4  *
   5  * Builtin diff command: Analyze two perf.data input files, look up and read
   6  * DSOs and symbol information, sort them and produce a diff.
   7  */
   8 #include "builtin.h"
   9
  10 #include "util/debug.h"
  11 #include "util/event.h"
  12 #include "util/hist.h"
  13 #include "util/evsel.h"
  14 #include "util/evlist.h"
  15 #include "util/session.h"
  16 #include "util/tool.h"
  17 #include "util/sort.h"
  18 #include "util/symbol.h"
  19 #include "util/util.h"
  20 #include "util/data.h"
  21 #include "util/config.h"
  22
  23 #include <errno.h>
  24 #include <inttypes.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27
  28 /* Diff command specific HPP columns. */
  29 enum {
  30         PERF_HPP_DIFF__BASELINE,
  31         PERF_HPP_DIFF__PERIOD,
  32         PERF_HPP_DIFF__PERIOD_BASELINE,
  33         PERF_HPP_DIFF__DELTA,
  34         PERF_HPP_DIFF__RATIO,
  35         PERF_HPP_DIFF__WEIGHTED_DIFF,
  36         PERF_HPP_DIFF__FORMULA,
  37         PERF_HPP_DIFF__DELTA_ABS,
  38
  39         PERF_HPP_DIFF__MAX_INDEX
  40 };
  41
  42 struct diff_hpp_fmt {
  43         struct perf_hpp_fmt      fmt;
  44         int                      idx;
  45         char                    *header;
  46         int                      header_width;
  47 };
  48
  49 struct data__file {
  50         struct perf_session     *session;
  51         struct perf_data         data;
  52         int                      idx;
  53         struct hists            *hists;
  54         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
  55 };
  56
  57 static struct data__file *data__files;
  58 static int data__files_cnt;
  59
  60 #define data__for_each_file_start(i, d, s)      \
  61         for (i = s, d = &data__files[s];        \
  62              i < data__files_cnt;               \
  63              i++, d = &data__files[i])
  64
  65 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  66 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
  67
  68 static bool force;
  69 static bool show_period;
  70 static bool show_formula;
  71 static bool show_baseline_only;
  72 static unsigned int sort_compute = 1;
  73
  74 static s64 compute_wdiff_w1;
  75 static s64 compute_wdiff_w2;
  76
  77 enum {
  78         COMPUTE_DELTA,
  79         COMPUTE_RATIO,
  80         COMPUTE_WEIGHTED_DIFF,
  81         COMPUTE_DELTA_ABS,
  82         COMPUTE_MAX,
  83 };
  84
  85 const char *compute_names[COMPUTE_MAX] = {
  86         [COMPUTE_DELTA] = "delta",
  87         [COMPUTE_DELTA_ABS] = "delta-abs",
  88         [COMPUTE_RATIO] = "ratio",
  89         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
  90 };
  91
  92 static int compute = COMPUTE_DELTA_ABS;
  93
  94 static int compute_2_hpp[COMPUTE_MAX] = {
  95         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
  96         [COMPUTE_DELTA_ABS]     = PERF_HPP_DIFF__DELTA_ABS,
  97         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
  98         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
  99 };
 100
 101 #define MAX_COL_WIDTH 70
 102
 103 static struct header_column {
 104         const char *name;
 105         int width;
 106 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
 107         [PERF_HPP_DIFF__BASELINE] = {
 108                 .name  = "Baseline",
 109         },
 110         [PERF_HPP_DIFF__PERIOD] = {
 111                 .name  = "Period",
 112                 .width = 14,
 113         },
 114         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
 115                 .name  = "Base period",
 116                 .width = 14,
 117         },
 118         [PERF_HPP_DIFF__DELTA] = {
 119                 .name  = "Delta",
 120                 .width = 7,
 121         },
 122         [PERF_HPP_DIFF__DELTA_ABS] = {
 123                 .name  = "Delta Abs",
 124                 .width = 7,
 125         },
 126         [PERF_HPP_DIFF__RATIO] = {
 127                 .name  = "Ratio",
 128                 .width = 14,
 129         },
 130         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 131                 .name  = "Weighted diff",
 132                 .width = 14,
 133         },
 134         [PERF_HPP_DIFF__FORMULA] = {
 135                 .name  = "Formula",
 136                 .width = MAX_COL_WIDTH,
 137         }
 138 };
 139
 140 static int setup_compute_opt_wdiff(char *opt)
 141 {
 142         char *w1_str = opt;
 143         char *w2_str;
 144
 145         int ret = -EINVAL;
 146
 147         if (!opt)
 148                 goto out;
 149
 150         w2_str = strchr(opt, ',');
 151         if (!w2_str)
 152                 goto out;
 153
 154         *w2_str++ = 0x0;
 155         if (!*w2_str)
 156                 goto out;
 157
 158         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 159         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 160
 161         if (!compute_wdiff_w1 || !compute_wdiff_w2)
 162                 goto out;
 163
 164         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 165                   compute_wdiff_w1, compute_wdiff_w2);
 166
 167         ret = 0;
 168
 169  out:
 170         if (ret)
 171                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 172
 173         return ret;
 174 }
 175
 176 static int setup_compute_opt(char *opt)
 177 {
 178         if (compute == COMPUTE_WEIGHTED_DIFF)
 179                 return setup_compute_opt_wdiff(opt);
 180
 181         if (opt) {
 182                 pr_err("Failed: extra option specified '%s'", opt);
 183                 return -EINVAL;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int setup_compute(const struct option *opt, const char *str,
 190                          int unset __maybe_unused)
 191 {
 192         int *cp = (int *) opt->value;
 193         char *cstr = (char *) str;
 194         char buf[50];
 195         unsigned i;
 196         char *option;
 197
 198         if (!str) {
 199                 *cp = COMPUTE_DELTA;
 200                 return 0;
 201         }
 202
 203         option = strchr(str, ':');
 204         if (option) {
 205                 unsigned len = option++ - str;
 206
 207                 /*
 208                  * The str data are not writeable, so we need
 209                  * to use another buffer.
 210                  */
 211
 212                 /* No option value is longer. */
 213                 if (len >= sizeof(buf))
 214                         return -EINVAL;
 215
 216                 strncpy(buf, str, len);
 217                 buf[len] = 0x0;
 218                 cstr = buf;
 219         }
 220
 221         for (i = 0; i < COMPUTE_MAX; i++)
 222                 if (!strcmp(cstr, compute_names[i])) {
 223                         *cp = i;
 224                         return setup_compute_opt(option);
 225                 }
 226
 227         pr_err("Failed: '%s' is not computation method "
 228                "(use 'delta','ratio' or 'wdiff')\n", str);
 229         return -EINVAL;
 230 }
 231
 232 static double period_percent(struct hist_entry *he, u64 period)
 233 {
 234         u64 total = hists__total_period(he->hists);
 235
 236         return (period * 100.0) / total;
 237 }
 238
 239 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 240 {
 241         double old_percent = period_percent(he, he->stat.period);
 242         double new_percent = period_percent(pair, pair->stat.period);
 243
 244         pair->diff.period_ratio_delta = new_percent - old_percent;
 245         pair->diff.computed = true;
 246         return pair->diff.period_ratio_delta;
 247 }
 248
 249 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 250 {
 251         double old_period = he->stat.period ?: 1;
 252         double new_period = pair->stat.period;
 253
 254         pair->diff.computed = true;
 255         pair->diff.period_ratio = new_period / old_period;
 256         return pair->diff.period_ratio;
 257 }
 258
 259 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 260 {
 261         u64 old_period = he->stat.period;
 262         u64 new_period = pair->stat.period;
 263
 264         pair->diff.computed = true;
 265         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 266                            old_period * compute_wdiff_w1;
 267
 268         return pair->diff.wdiff;
 269 }
 270
 271 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 272                          char *buf, size_t size)
 273 {
 274         u64 he_total = he->hists->stats.total_period;
 275         u64 pair_total = pair->hists->stats.total_period;
 276
 277         if (symbol_conf.filter_relative) {
 278                 he_total = he->hists->stats.total_non_filtered_period;
 279                 pair_total = pair->hists->stats.total_non_filtered_period;
 280         }
 281         return scnprintf(buf, size,
 282                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 283                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 284                          pair->stat.period, pair_total,
 285                          he->stat.period, he_total);
 286 }
 287
 288 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 289                          char *buf, size_t size)
 290 {
 291         double old_period = he->stat.period;
 292         double new_period = pair->stat.period;
 293
 294         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 295 }
 296
 297 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 298                          char *buf, size_t size)
 299 {
 300         u64 old_period = he->stat.period;
 301         u64 new_period = pair->stat.period;
 302
 303         return scnprintf(buf, size,
 304                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 305                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 306 }
 307
 308 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 309                            char *buf, size_t size)
 310 {
 311         switch (compute) {
 312         case COMPUTE_DELTA:
 313         case COMPUTE_DELTA_ABS:
 314                 return formula_delta(he, pair, buf, size);
 315         case COMPUTE_RATIO:
 316                 return formula_ratio(he, pair, buf, size);
 317         case COMPUTE_WEIGHTED_DIFF:
 318                 return formula_wdiff(he, pair, buf, size);
 319         default:
 320                 BUG_ON(1);
 321         }
 322
 323         return -1;
 324 }
 325
 326 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
 327                                       union perf_event *event,
 328                                       struct perf_sample *sample,
 329                                       struct perf_evsel *evsel,
 330                                       struct machine *machine)
 331 {
 332         struct addr_location al;
 333         struct hists *hists = evsel__hists(evsel);
 334         int ret = -1;
 335
 336         if (machine__resolve(machine, &al, sample) < 0) {
 337                 pr_warning("problem processing %d event, skipping it.\n",
 338                            event->header.type);
 339                 return -1;
 340         }
 341
 342         if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample, true)) {
 343                 pr_warning("problem incrementing symbol period, skipping event\n");
 344                 goto out_put;
 345         }
 346
 347         /*
 348          * The total_period is updated here before going to the output
 349          * tree since normally only the baseline hists will call
 350          * hists__output_resort() and precompute needs the total
 351          * period in order to sort entries by percentage delta.
 352          */
 353         hists->stats.total_period += sample->period;
 354         if (!al.filtered)
 355                 hists->stats.total_non_filtered_period += sample->period;
 356         ret = 0;
 357 out_put:
 358         addr_location__put(&al);
 359         return ret;
 360 }
 361
 362 static struct perf_tool tool = {
 363         .sample = diff__process_sample_event,
 364         .mmap   = perf_event__process_mmap,
 365         .mmap2  = perf_event__process_mmap2,
 366         .comm   = perf_event__process_comm,
 367         .exit   = perf_event__process_exit,
 368         .fork   = perf_event__process_fork,
 369         .lost   = perf_event__process_lost,
 370         .namespaces = perf_event__process_namespaces,
 371         .ordered_events = true,
 372         .ordering_requires_timestamps = true,
 373 };
 374
 375 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 376                                       struct perf_evlist *evlist)
 377 {
 378         struct perf_evsel *e;
 379
 380         evlist__for_each_entry(evlist, e) {
 381                 if (perf_evsel__match2(evsel, e))
 382                         return e;
 383         }
 384
 385         return NULL;
 386 }
 387
 388 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 389 {
 390         struct perf_evsel *evsel;
 391
 392         evlist__for_each_entry(evlist, evsel) {
 393                 struct hists *hists = evsel__hists(evsel);
 394
 395                 hists__collapse_resort(hists, NULL);
 396         }
 397 }
 398
 399 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 400 {
 401         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 402         void *ptr = dfmt - dfmt->idx;
 403         struct data__file *d = container_of(ptr, struct data__file, fmt);
 404
 405         return d;
 406 }
 407
 408 static struct hist_entry*
 409 get_pair_data(struct hist_entry *he, struct data__file *d)
 410 {
 411         if (hist_entry__has_pairs(he)) {
 412                 struct hist_entry *pair;
 413
 414                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 415                         if (pair->hists == d->hists)
 416                                 return pair;
 417         }
 418
 419         return NULL;
 420 }
 421
 422 static struct hist_entry*
 423 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 424 {
 425         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 426
 427         return get_pair_data(he, d);
 428 }
 429
 430 static void hists__baseline_only(struct hists *hists)
 431 {
 432         struct rb_root_cached *root;
 433         struct rb_node *next;
 434
 435         if (hists__has(hists, need_collapse))
 436                 root = &hists->entries_collapsed;
 437         else
 438                 root = hists->entries_in;
 439
 440         next = rb_first_cached(root);
 441         while (next != NULL) {
 442                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 443
 444                 next = rb_next(&he->rb_node_in);
 445                 if (!hist_entry__next_pair(he)) {
 446                         rb_erase_cached(&he->rb_node_in, root);
 447                         hist_entry__delete(he);
 448                 }
 449         }
 450 }
 451
 452 static void hists__precompute(struct hists *hists)
 453 {
 454         struct rb_root_cached *root;
 455         struct rb_node *next;
 456
 457         if (hists__has(hists, need_collapse))
 458                 root = &hists->entries_collapsed;
 459         else
 460                 root = hists->entries_in;
 461
 462         next = rb_first_cached(root);
 463         while (next != NULL) {
 464                 struct hist_entry *he, *pair;
 465                 struct data__file *d;
 466                 int i;
 467
 468                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 469                 next = rb_next(&he->rb_node_in);
 470
 471                 data__for_each_file_new(i, d) {
 472                         pair = get_pair_data(he, d);
 473                         if (!pair)
 474                                 continue;
 475
 476                         switch (compute) {
 477                         case COMPUTE_DELTA:
 478                         case COMPUTE_DELTA_ABS:
 479                                 compute_delta(he, pair);
 480                                 break;
 481                         case COMPUTE_RATIO:
 482                                 compute_ratio(he, pair);
 483                                 break;
 484                         case COMPUTE_WEIGHTED_DIFF:
 485                                 compute_wdiff(he, pair);
 486                                 break;
 487                         default:
 488                                 BUG_ON(1);
 489                         }
 490                 }
 491         }
 492 }
 493
 494 static int64_t cmp_doubles(double l, double r)
 495 {
 496         if (l > r)
 497                 return -1;
 498         else if (l < r)
 499                 return 1;
 500         else
 501                 return 0;
 502 }
 503
 504 static int64_t
 505 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 506                         int c)
 507 {
 508         switch (c) {
 509         case COMPUTE_DELTA:
 510         {
 511                 double l = left->diff.period_ratio_delta;
 512                 double r = right->diff.period_ratio_delta;
 513
 514                 return cmp_doubles(l, r);
 515         }
 516         case COMPUTE_DELTA_ABS:
 517         {
 518                 double l = fabs(left->diff.period_ratio_delta);
 519                 double r = fabs(right->diff.period_ratio_delta);
 520
 521                 return cmp_doubles(l, r);
 522         }
 523         case COMPUTE_RATIO:
 524         {
 525                 double l = left->diff.period_ratio;
 526                 double r = right->diff.period_ratio;
 527
 528                 return cmp_doubles(l, r);
 529         }
 530         case COMPUTE_WEIGHTED_DIFF:
 531         {
 532                 s64 l = left->diff.wdiff;
 533                 s64 r = right->diff.wdiff;
 534
 535                 return r - l;
 536         }
 537         default:
 538                 BUG_ON(1);
 539         }
 540
 541         return 0;
 542 }
 543
 544 static int64_t
 545 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 546                         int c, int sort_idx)
 547 {
 548         bool pairs_left  = hist_entry__has_pairs(left);
 549         bool pairs_right = hist_entry__has_pairs(right);
 550         struct hist_entry *p_right, *p_left;
 551
 552         if (!pairs_left && !pairs_right)
 553                 return 0;
 554
 555         if (!pairs_left || !pairs_right)
 556                 return pairs_left ? -1 : 1;
 557
 558         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 559         p_right = get_pair_data(right, &data__files[sort_idx]);
 560
 561         if (!p_left && !p_right)
 562                 return 0;
 563
 564         if (!p_left || !p_right)
 565                 return p_left ? -1 : 1;
 566
 567         /*
 568          * We have 2 entries of same kind, let's
 569          * make the data comparison.
 570          */
 571         return __hist_entry__cmp_compute(p_left, p_right, c);
 572 }
 573
 574 static int64_t
 575 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 576                             int c, int sort_idx)
 577 {
 578         struct hist_entry *p_right, *p_left;
 579
 580         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 581         p_right = get_pair_data(right, &data__files[sort_idx]);
 582
 583         if (!p_left && !p_right)
 584                 return 0;
 585
 586         if (!p_left || !p_right)
 587                 return p_left ? -1 : 1;
 588
 589         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 590                 /*
 591                  * The delta can be computed without the baseline, but
 592                  * others are not.  Put those entries which have no
 593                  * values below.
 594                  */
 595                 if (left->dummy && right->dummy)
 596                         return 0;
 597
 598                 if (left->dummy || right->dummy)
 599                         return left->dummy ? 1 : -1;
 600         }
 601
 602         return __hist_entry__cmp_compute(p_left, p_right, c);
 603 }
 604
 605 static int64_t
 606 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 607                     struct hist_entry *left __maybe_unused,
 608                     struct hist_entry *right __maybe_unused)
 609 {
 610         return 0;
 611 }
 612
 613 static int64_t
 614 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 615                          struct hist_entry *left, struct hist_entry *right)
 616 {
 617         if (left->stat.period == right->stat.period)
 618                 return 0;
 619         return left->stat.period > right->stat.period ? 1 : -1;
 620 }
 621
 622 static int64_t
 623 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 624                       struct hist_entry *left, struct hist_entry *right)
 625 {
 626         struct data__file *d = fmt_to_data_file(fmt);
 627
 628         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 629 }
 630
 631 static int64_t
 632 hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
 633                       struct hist_entry *left, struct hist_entry *right)
 634 {
 635         struct data__file *d = fmt_to_data_file(fmt);
 636
 637         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
 638 }
 639
 640 static int64_t
 641 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 642                       struct hist_entry *left, struct hist_entry *right)
 643 {
 644         struct data__file *d = fmt_to_data_file(fmt);
 645
 646         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 647 }
 648
 649 static int64_t
 650 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 651                       struct hist_entry *left, struct hist_entry *right)
 652 {
 653         struct data__file *d = fmt_to_data_file(fmt);
 654
 655         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 656 }
 657
 658 static int64_t
 659 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 660                           struct hist_entry *left, struct hist_entry *right)
 661 {
 662         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 663                                            sort_compute);
 664 }
 665
 666 static int64_t
 667 hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 668                               struct hist_entry *left, struct hist_entry *right)
 669 {
 670         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
 671                                            sort_compute);
 672 }
 673
 674 static int64_t
 675 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 676                           struct hist_entry *left, struct hist_entry *right)
 677 {
 678         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 679                                            sort_compute);
 680 }
 681
 682 static int64_t
 683 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 684                           struct hist_entry *left, struct hist_entry *right)
 685 {
 686         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 687                                            sort_compute);
 688 }
 689
 690 static void hists__process(struct hists *hists)
 691 {
 692         if (show_baseline_only)
 693                 hists__baseline_only(hists);
 694
 695         hists__precompute(hists);
 696         hists__output_resort(hists, NULL);
 697
 698         hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
 699                        !symbol_conf.use_callchain);
 700 }
 701
 702 static void data__fprintf(void)
 703 {
 704         struct data__file *d;
 705         int i;
 706
 707         fprintf(stdout, "# Data files:\n");
 708
 709         data__for_each_file(i, d)
 710                 fprintf(stdout, "#  [%d] %s %s\n",
 711                         d->idx, d->data.path,
 712                         !d->idx ? "(Baseline)" : "");
 713
 714         fprintf(stdout, "#\n");
 715 }
 716
 717 static void data_process(void)
 718 {
 719         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 720         struct perf_evsel *evsel_base;
 721         bool first = true;
 722
 723         evlist__for_each_entry(evlist_base, evsel_base) {
 724                 struct hists *hists_base = evsel__hists(evsel_base);
 725                 struct data__file *d;
 726                 int i;
 727
 728                 data__for_each_file_new(i, d) {
 729                         struct perf_evlist *evlist = d->session->evlist;
 730                         struct perf_evsel *evsel;
 731                         struct hists *hists;
 732
 733                         evsel = evsel_match(evsel_base, evlist);
 734                         if (!evsel)
 735                                 continue;
 736
 737                         hists = evsel__hists(evsel);
 738                         d->hists = hists;
 739
 740                         hists__match(hists_base, hists);
 741
 742                         if (!show_baseline_only)
 743                                 hists__link(hists_base, hists);
 744                 }
 745
 746                 if (!quiet) {
 747                         fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 748                                 perf_evsel__name(evsel_base));
 749                 }
 750
 751                 first = false;
 752
 753                 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
 754                         data__fprintf();
 755
 756                 /* Don't sort callchain for perf diff */
 757                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
 758
 759                 hists__process(hists_base);
 760         }
 761 }
 762
 763 static void data__free(struct data__file *d)
 764 {
 765         int col;
 766
 767         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 768                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 769
 770                 zfree(&fmt->header);
 771         }
 772 }
 773
 774 static int __cmd_diff(void)
 775 {
 776         struct data__file *d;
 777         int ret = -EINVAL, i;
 778
 779         data__for_each_file(i, d) {
 780                 d->session = perf_session__new(&d->data, false, &tool);
 781                 if (!d->session) {
 782                         pr_err("Failed to open %s\n", d->data.path);
 783                         ret = -1;
 784                         goto out_delete;
 785                 }
 786
 787                 ret = perf_session__process_events(d->session);
 788                 if (ret) {
 789                         pr_err("Failed to process %s\n", d->data.path);
 790                         goto out_delete;
 791                 }
 792
 793                 perf_evlist__collapse_resort(d->session->evlist);
 794         }
 795
 796         data_process();
 797
 798  out_delete:
 799         data__for_each_file(i, d) {
 800                 perf_session__delete(d->session);
 801                 data__free(d);
 802         }
 803
 804         free(data__files);
 805         return ret;
 806 }
 807
 808 static const char * const diff_usage[] = {
 809         "perf diff [<options>] [old_file] [new_file]",
 810         NULL,
 811 };
 812
 813 static const struct option options[] = {
 814         OPT_INCR('v', "verbose", &verbose,
 815                     "be more verbose (show symbol address, etc)"),
 816         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 817         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 818                     "Show only items with match in baseline"),
 819         OPT_CALLBACK('c', "compute", &compute,
 820                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs)",
 821                      "Entries differential computation selection",
 822                      setup_compute),
 823         OPT_BOOLEAN('p', "period", &show_period,
 824                     "Show period values."),
 825         OPT_BOOLEAN('F', "formula", &show_formula,
 826                     "Show formula."),
 827         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 828                     "dump raw trace in ASCII"),
 829         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 830         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
 831                    "file", "kallsyms pathname"),
 832         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 833                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 834         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 835                    "only consider symbols in these dsos"),
 836         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 837                    "only consider symbols in these comms"),
 838         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 839                    "only consider these symbols"),
 840         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 841                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 842                    " Please refer the man page for the complete list."),
 843         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
 844                    "separator for columns, no spaces will be added between "
 845                    "columns '.' is reserved."),
 846         OPT_CALLBACK(0, "symfs", NULL, "directory",
 847                      "Look for files with symbols relative to this directory",
 848                      symbol__config_symfs),
 849         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 850         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 851                      "How to display percentage of filtered entries", parse_filter_percentage),
 852         OPT_END()
 853 };
 854
 855 static double baseline_percent(struct hist_entry *he)
 856 {
 857         u64 total = hists__total_period(he->hists);
 858
 859         return 100.0 * he->stat.period / total;
 860 }
 861
 862 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 863                                struct perf_hpp *hpp, struct hist_entry *he)
 864 {
 865         struct diff_hpp_fmt *dfmt =
 866                 container_of(fmt, struct diff_hpp_fmt, fmt);
 867         double percent = baseline_percent(he);
 868         char pfmt[20] = " ";
 869
 870         if (!he->dummy) {
 871                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 872                 return percent_color_snprintf(hpp->buf, hpp->size,
 873                                               pfmt, percent);
 874         } else
 875                 return scnprintf(hpp->buf, hpp->size, "%*s",
 876                                  dfmt->header_width, pfmt);
 877 }
 878
 879 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 880 {
 881         double percent = baseline_percent(he);
 882         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 883         int ret = 0;
 884
 885         if (!he->dummy)
 886                 ret = scnprintf(buf, size, fmt, percent);
 887
 888         return ret;
 889 }
 890
 891 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 892                                 struct perf_hpp *hpp, struct hist_entry *he,
 893                                 int comparison_method)
 894 {
 895         struct diff_hpp_fmt *dfmt =
 896                 container_of(fmt, struct diff_hpp_fmt, fmt);
 897         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 898         double diff;
 899         s64 wdiff;
 900         char pfmt[20] = " ";
 901
 902         if (!pair)
 903                 goto no_print;
 904
 905         switch (comparison_method) {
 906         case COMPUTE_DELTA:
 907                 if (pair->diff.computed)
 908                         diff = pair->diff.period_ratio_delta;
 909                 else
 910                         diff = compute_delta(he, pair);
 911
 912                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 913                 return percent_color_snprintf(hpp->buf, hpp->size,
 914                                         pfmt, diff);
 915         case COMPUTE_RATIO:
 916                 if (he->dummy)
 917                         goto dummy_print;
 918                 if (pair->diff.computed)
 919                         diff = pair->diff.period_ratio;
 920                 else
 921                         diff = compute_ratio(he, pair);
 922
 923                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 924                 return value_color_snprintf(hpp->buf, hpp->size,
 925                                         pfmt, diff);
 926         case COMPUTE_WEIGHTED_DIFF:
 927                 if (he->dummy)
 928                         goto dummy_print;
 929                 if (pair->diff.computed)
 930                         wdiff = pair->diff.wdiff;
 931                 else
 932                         wdiff = compute_wdiff(he, pair);
 933
 934                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 935                 return color_snprintf(hpp->buf, hpp->size,
 936                                 get_percent_color(wdiff),
 937                                 pfmt, wdiff);
 938         default:
 939                 BUG_ON(1);
 940         }
 941 dummy_print:
 942         return scnprintf(hpp->buf, hpp->size, "%*s",
 943                         dfmt->header_width, "N/A");
 944 no_print:
 945         return scnprintf(hpp->buf, hpp->size, "%*s",
 946                         dfmt->header_width, pfmt);
 947 }
 948
 949 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 950                         struct perf_hpp *hpp, struct hist_entry *he)
 951 {
 952         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 953 }
 954
 955 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 956                         struct perf_hpp *hpp, struct hist_entry *he)
 957 {
 958         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 959 }
 960
 961 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 962                         struct perf_hpp *hpp, struct hist_entry *he)
 963 {
 964         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 965 }
 966
 967 static void
 968 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 969 {
 970         switch (idx) {
 971         case PERF_HPP_DIFF__PERIOD_BASELINE:
 972                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 973                 break;
 974
 975         default:
 976                 break;
 977         }
 978 }
 979
 980 static void
 981 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 982                 int idx, char *buf, size_t size)
 983 {
 984         double diff;
 985         double ratio;
 986         s64 wdiff;
 987
 988         switch (idx) {
 989         case PERF_HPP_DIFF__DELTA:
 990         case PERF_HPP_DIFF__DELTA_ABS:
 991                 if (pair->diff.computed)
 992                         diff = pair->diff.period_ratio_delta;
 993                 else
 994                         diff = compute_delta(he, pair);
 995
 996                 scnprintf(buf, size, "%+4.2F%%", diff);
 997                 break;
 998
 999         case PERF_HPP_DIFF__RATIO:
1000                 /* No point for ratio number if we are dummy.. */
1001                 if (he->dummy) {
1002                         scnprintf(buf, size, "N/A");
1003                         break;
1004                 }
1005
1006                 if (pair->diff.computed)
1007                         ratio = pair->diff.period_ratio;
1008                 else
1009                         ratio = compute_ratio(he, pair);
1010
1011                 if (ratio > 0.0)
1012                         scnprintf(buf, size, "%14.6F", ratio);
1013                 break;
1014
1015         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1016                 /* No point for wdiff number if we are dummy.. */
1017                 if (he->dummy) {
1018                         scnprintf(buf, size, "N/A");
1019                         break;
1020                 }
1021
1022                 if (pair->diff.computed)
1023                         wdiff = pair->diff.wdiff;
1024                 else
1025                         wdiff = compute_wdiff(he, pair);
1026
1027                 if (wdiff != 0)
1028                         scnprintf(buf, size, "%14ld", wdiff);
1029                 break;
1030
1031         case PERF_HPP_DIFF__FORMULA:
1032                 formula_fprintf(he, pair, buf, size);
1033                 break;
1034
1035         case PERF_HPP_DIFF__PERIOD:
1036                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1037                 break;
1038
1039         default:
1040                 BUG_ON(1);
1041         };
1042 }
1043
1044 static void
1045 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1046                     char *buf, size_t size)
1047 {
1048         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1049         int idx = dfmt->idx;
1050
1051         /* baseline is special */
1052         if (idx == PERF_HPP_DIFF__BASELINE)
1053                 hpp__entry_baseline(he, buf, size);
1054         else {
1055                 if (pair)
1056                         hpp__entry_pair(he, pair, idx, buf, size);
1057                 else
1058                         hpp__entry_unpair(he, idx, buf, size);
1059         }
1060 }
1061
1062 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1063                              struct hist_entry *he)
1064 {
1065         struct diff_hpp_fmt *dfmt =
1066                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1067         char buf[MAX_COL_WIDTH] = " ";
1068
1069         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1070
1071         if (symbol_conf.field_sep)
1072                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1073         else
1074                 return scnprintf(hpp->buf, hpp->size, "%*s",
1075                                  dfmt->header_width, buf);
1076 }
1077
1078 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1079                        struct hists *hists __maybe_unused,
1080                        int line __maybe_unused,
1081                        int *span __maybe_unused)
1082 {
1083         struct diff_hpp_fmt *dfmt =
1084                 container_of(fmt, struct diff_hpp_fmt, fmt);
1085
1086         BUG_ON(!dfmt->header);
1087         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1088 }
1089
1090 static int hpp__width(struct perf_hpp_fmt *fmt,
1091                       struct perf_hpp *hpp __maybe_unused,
1092                       struct hists *hists __maybe_unused)
1093 {
1094         struct diff_hpp_fmt *dfmt =
1095                 container_of(fmt, struct diff_hpp_fmt, fmt);
1096
1097         BUG_ON(dfmt->header_width <= 0);
1098         return dfmt->header_width;
1099 }
1100
1101 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1102 {
1103 #define MAX_HEADER_NAME 100
1104         char buf_indent[MAX_HEADER_NAME];
1105         char buf[MAX_HEADER_NAME];
1106         const char *header = NULL;
1107         int width = 0;
1108
1109         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1110         header = columns[dfmt->idx].name;
1111         width  = columns[dfmt->idx].width;
1112
1113         /* Only our defined HPP fmts should appear here. */
1114         BUG_ON(!header);
1115
1116         if (data__files_cnt > 2)
1117                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1118
1119 #define NAME (data__files_cnt > 2 ? buf : header)
1120         dfmt->header_width = width;
1121         width = (int) strlen(NAME);
1122         if (dfmt->header_width < width)
1123                 dfmt->header_width = width;
1124
1125         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1126                   dfmt->header_width, NAME);
1127
1128         dfmt->header = strdup(buf_indent);
1129 #undef MAX_HEADER_NAME
1130 #undef NAME
1131 }
1132
1133 static void data__hpp_register(struct data__file *d, int idx)
1134 {
1135         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1136         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1137
1138         dfmt->idx = idx;
1139
1140         fmt->header = hpp__header;
1141         fmt->width  = hpp__width;
1142         fmt->entry  = hpp__entry_global;
1143         fmt->cmp    = hist_entry__cmp_nop;
1144         fmt->collapse = hist_entry__cmp_nop;
1145
1146         /* TODO more colors */
1147         switch (idx) {
1148         case PERF_HPP_DIFF__BASELINE:
1149                 fmt->color = hpp__color_baseline;
1150                 fmt->sort  = hist_entry__cmp_baseline;
1151                 break;
1152         case PERF_HPP_DIFF__DELTA:
1153                 fmt->color = hpp__color_delta;
1154                 fmt->sort  = hist_entry__cmp_delta;
1155                 break;
1156         case PERF_HPP_DIFF__RATIO:
1157                 fmt->color = hpp__color_ratio;
1158                 fmt->sort  = hist_entry__cmp_ratio;
1159                 break;
1160         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1161                 fmt->color = hpp__color_wdiff;
1162                 fmt->sort  = hist_entry__cmp_wdiff;
1163                 break;
1164         case PERF_HPP_DIFF__DELTA_ABS:
1165                 fmt->color = hpp__color_delta;
1166                 fmt->sort  = hist_entry__cmp_delta_abs;
1167                 break;
1168         default:
1169                 fmt->sort  = hist_entry__cmp_nop;
1170                 break;
1171         }
1172
1173         init_header(d, dfmt);
1174         perf_hpp__column_register(fmt);
1175         perf_hpp__register_sort_field(fmt);
1176 }
1177
1178 static int ui_init(void)
1179 {
1180         struct data__file *d;
1181         struct perf_hpp_fmt *fmt;
1182         int i;
1183
1184         data__for_each_file(i, d) {
1185
1186                 /*
1187                  * Baseline or compute realted columns:
1188                  *
1189                  *   PERF_HPP_DIFF__BASELINE
1190                  *   PERF_HPP_DIFF__DELTA
1191                  *   PERF_HPP_DIFF__RATIO
1192                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1193                  */
1194                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1195                                           PERF_HPP_DIFF__BASELINE);
1196
1197                 /*
1198                  * And the rest:
1199                  *
1200                  * PERF_HPP_DIFF__FORMULA
1201                  * PERF_HPP_DIFF__PERIOD
1202                  * PERF_HPP_DIFF__PERIOD_BASELINE
1203                  */
1204                 if (show_formula && i)
1205                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1206
1207                 if (show_period)
1208                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1209                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1210         }
1211
1212         if (!sort_compute)
1213                 return 0;
1214
1215         /*
1216          * Prepend an fmt to sort on columns at 'sort_compute' first.
1217          * This fmt is added only to the sort list but not to the
1218          * output fields list.
1219          *
1220          * Note that this column (data) can be compared twice - one
1221          * for this 'sort_compute' fmt and another for the normal
1222          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1223          * will be sorted out by first try or baseline and comparing
1224          * is not a costly operation.
1225          */
1226         fmt = zalloc(sizeof(*fmt));
1227         if (fmt == NULL) {
1228                 pr_err("Memory allocation failed\n");
1229                 return -1;
1230         }
1231
1232         fmt->cmp      = hist_entry__cmp_nop;
1233         fmt->collapse = hist_entry__cmp_nop;
1234
1235         switch (compute) {
1236         case COMPUTE_DELTA:
1237                 fmt->sort = hist_entry__cmp_delta_idx;
1238                 break;
1239         case COMPUTE_RATIO:
1240                 fmt->sort = hist_entry__cmp_ratio_idx;
1241                 break;
1242         case COMPUTE_WEIGHTED_DIFF:
1243                 fmt->sort = hist_entry__cmp_wdiff_idx;
1244                 break;
1245         case COMPUTE_DELTA_ABS:
1246                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1247                 break;
1248         default:
1249                 BUG_ON(1);
1250         }
1251
1252         perf_hpp__prepend_sort_field(fmt);
1253         return 0;
1254 }
1255
1256 static int data_init(int argc, const char **argv)
1257 {
1258         struct data__file *d;
1259         static const char *defaults[] = {
1260                 "perf.data.old",
1261                 "perf.data",
1262         };
1263         bool use_default = true;
1264         int i;
1265
1266         data__files_cnt = 2;
1267
1268         if (argc) {
1269                 if (argc == 1)
1270                         defaults[1] = argv[0];
1271                 else {
1272                         data__files_cnt = argc;
1273                         use_default = false;
1274                 }
1275         } else if (perf_guest) {
1276                 defaults[0] = "perf.data.host";
1277                 defaults[1] = "perf.data.guest";
1278         }
1279
1280         if (sort_compute >= (unsigned int) data__files_cnt) {
1281                 pr_err("Order option out of limit.\n");
1282                 return -EINVAL;
1283         }
1284
1285         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1286         if (!data__files)
1287                 return -ENOMEM;
1288
1289         data__for_each_file(i, d) {
1290                 struct perf_data *data = &d->data;
1291
1292                 data->path  = use_default ? defaults[i] : argv[i];
1293                 data->mode  = PERF_DATA_MODE_READ,
1294                 data->force = force,
1295
1296                 d->idx  = i;
1297         }
1298
1299         return 0;
1300 }
1301
1302 static int diff__config(const char *var, const char *value,
1303                         void *cb __maybe_unused)
1304 {
1305         if (!strcmp(var, "diff.order")) {
1306                 int ret;
1307                 if (perf_config_int(&ret, var, value) < 0)
1308                         return -1;
1309                 sort_compute = ret;
1310                 return 0;
1311         }
1312         if (!strcmp(var, "diff.compute")) {
1313                 if (!strcmp(value, "delta")) {
1314                         compute = COMPUTE_DELTA;
1315                 } else if (!strcmp(value, "delta-abs")) {
1316                         compute = COMPUTE_DELTA_ABS;
1317                 } else if (!strcmp(value, "ratio")) {
1318                         compute = COMPUTE_RATIO;
1319                 } else if (!strcmp(value, "wdiff")) {
1320                         compute = COMPUTE_WEIGHTED_DIFF;
1321                 } else {
1322                         pr_err("Invalid compute method: %s\n", value);
1323                         return -1;
1324                 }
1325         }
1326
1327         return 0;
1328 }
1329
1330 int cmd_diff(int argc, const char **argv)
1331 {
1332         int ret = hists__init();
1333
1334         if (ret < 0)
1335                 return ret;
1336
1337         perf_config(diff__config, NULL);
1338
1339         argc = parse_options(argc, argv, options, diff_usage, 0);
1340
1341         if (quiet)
1342                 perf_quiet_option();
1343
1344         if (symbol__init(NULL) < 0)
1345                 return -1;
1346
1347         if (data_init(argc, argv) < 0)
1348                 return -1;
1349
1350         if (ui_init() < 0)
1351                 return -1;
1352
1353         sort__mode = SORT_MODE__DIFF;
1354
1355         if (setup_sorting(NULL) < 0)
1356                 usage_with_options(diff_usage, options);
1357
1358         setup_pager();
1359
1360         sort__setup_elide(NULL);
1361
1362         return __cmd_diff();
1363 }