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