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 #include "perf.h"
  10
  11 #include "util/debug.h"
  12 #include "util/event.h"
  13 #include "util/hist.h"
  14 #include "util/evsel.h"
  15 #include "util/evlist.h"
  16 #include "util/session.h"
  17 #include "util/tool.h"
  18 #include "util/sort.h"
  19 #include "util/srcline.h"
  20 #include "util/symbol.h"
  21 #include "util/data.h"
  22 #include "util/config.h"
  23 #include "util/time-utils.h"
  24 #include "util/annotate.h"
  25 #include "util/map.h"
  26 #include "util/spark.h"
  27 #include "util/block-info.h"
  28 #include <linux/err.h>
  29 #include <linux/zalloc.h>
  30 #include <subcmd/pager.h>
  31 #include <subcmd/parse-options.h>
  32
  33 #include <errno.h>
  34 #include <inttypes.h>
  35 #include <stdlib.h>
  36 #include <math.h>
  37
  38 struct perf_diff {
  39         struct perf_tool                 tool;
  40         const char                      *time_str;
  41         struct perf_time_interval       *ptime_range;
  42         int                              range_size;
  43         int                              range_num;
  44         bool                             has_br_stack;
  45 };
  46
  47 /* Diff command specific HPP columns. */
  48 enum {
  49         PERF_HPP_DIFF__BASELINE,
  50         PERF_HPP_DIFF__PERIOD,
  51         PERF_HPP_DIFF__PERIOD_BASELINE,
  52         PERF_HPP_DIFF__DELTA,
  53         PERF_HPP_DIFF__RATIO,
  54         PERF_HPP_DIFF__WEIGHTED_DIFF,
  55         PERF_HPP_DIFF__FORMULA,
  56         PERF_HPP_DIFF__DELTA_ABS,
  57         PERF_HPP_DIFF__CYCLES,
  58         PERF_HPP_DIFF__CYCLES_HIST,
  59
  60         PERF_HPP_DIFF__MAX_INDEX
  61 };
  62
  63 struct diff_hpp_fmt {
  64         struct perf_hpp_fmt      fmt;
  65         int                      idx;
  66         char                    *header;
  67         int                      header_width;
  68 };
  69
  70 struct data__file {
  71         struct perf_session     *session;
  72         struct perf_data         data;
  73         int                      idx;
  74         struct hists            *hists;
  75         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
  76 };
  77
  78 static struct data__file *data__files;
  79 static int data__files_cnt;
  80
  81 #define data__for_each_file_start(i, d, s)      \
  82         for (i = s, d = &data__files[s];        \
  83              i < data__files_cnt;               \
  84              i++, d = &data__files[i])
  85
  86 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  87 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
  88
  89 static bool force;
  90 static bool show_period;
  91 static bool show_formula;
  92 static bool show_baseline_only;
  93 static bool cycles_hist;
  94 static unsigned int sort_compute = 1;
  95
  96 static s64 compute_wdiff_w1;
  97 static s64 compute_wdiff_w2;
  98
  99 static const char               *cpu_list;
 100 static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 101
 102 enum {
 103         COMPUTE_DELTA,
 104         COMPUTE_RATIO,
 105         COMPUTE_WEIGHTED_DIFF,
 106         COMPUTE_DELTA_ABS,
 107         COMPUTE_CYCLES,
 108         COMPUTE_MAX,
 109 };
 110
 111 const char *compute_names[COMPUTE_MAX] = {
 112         [COMPUTE_DELTA] = "delta",
 113         [COMPUTE_DELTA_ABS] = "delta-abs",
 114         [COMPUTE_RATIO] = "ratio",
 115         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
 116         [COMPUTE_CYCLES] = "cycles",
 117 };
 118
 119 static int compute = COMPUTE_DELTA_ABS;
 120
 121 static int compute_2_hpp[COMPUTE_MAX] = {
 122         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
 123         [COMPUTE_DELTA_ABS]     = PERF_HPP_DIFF__DELTA_ABS,
 124         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
 125         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
 126         [COMPUTE_CYCLES]        = PERF_HPP_DIFF__CYCLES,
 127 };
 128
 129 #define MAX_COL_WIDTH 70
 130
 131 static struct header_column {
 132         const char *name;
 133         int width;
 134 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
 135         [PERF_HPP_DIFF__BASELINE] = {
 136                 .name  = "Baseline",
 137         },
 138         [PERF_HPP_DIFF__PERIOD] = {
 139                 .name  = "Period",
 140                 .width = 14,
 141         },
 142         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
 143                 .name  = "Base period",
 144                 .width = 14,
 145         },
 146         [PERF_HPP_DIFF__DELTA] = {
 147                 .name  = "Delta",
 148                 .width = 7,
 149         },
 150         [PERF_HPP_DIFF__DELTA_ABS] = {
 151                 .name  = "Delta Abs",
 152                 .width = 7,
 153         },
 154         [PERF_HPP_DIFF__RATIO] = {
 155                 .name  = "Ratio",
 156                 .width = 14,
 157         },
 158         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 159                 .name  = "Weighted diff",
 160                 .width = 14,
 161         },
 162         [PERF_HPP_DIFF__FORMULA] = {
 163                 .name  = "Formula",
 164                 .width = MAX_COL_WIDTH,
 165         },
 166         [PERF_HPP_DIFF__CYCLES] = {
 167                 .name  = "[Program Block Range] Cycles Diff",
 168                 .width = 70,
 169         },
 170         [PERF_HPP_DIFF__CYCLES_HIST] = {
 171                 .name  = "stddev/Hist",
 172                 .width = NUM_SPARKS + 9,
 173         }
 174 };
 175
 176 static int setup_compute_opt_wdiff(char *opt)
 177 {
 178         char *w1_str = opt;
 179         char *w2_str;
 180
 181         int ret = -EINVAL;
 182
 183         if (!opt)
 184                 goto out;
 185
 186         w2_str = strchr(opt, ',');
 187         if (!w2_str)
 188                 goto out;
 189
 190         *w2_str++ = 0x0;
 191         if (!*w2_str)
 192                 goto out;
 193
 194         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 195         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 196
 197         if (!compute_wdiff_w1 || !compute_wdiff_w2)
 198                 goto out;
 199
 200         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 201                   compute_wdiff_w1, compute_wdiff_w2);
 202
 203         ret = 0;
 204
 205  out:
 206         if (ret)
 207                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 208
 209         return ret;
 210 }
 211
 212 static int setup_compute_opt(char *opt)
 213 {
 214         if (compute == COMPUTE_WEIGHTED_DIFF)
 215                 return setup_compute_opt_wdiff(opt);
 216
 217         if (opt) {
 218                 pr_err("Failed: extra option specified '%s'", opt);
 219                 return -EINVAL;
 220         }
 221
 222         return 0;
 223 }
 224
 225 static int setup_compute(const struct option *opt, const char *str,
 226                          int unset __maybe_unused)
 227 {
 228         int *cp = (int *) opt->value;
 229         char *cstr = (char *) str;
 230         char buf[50];
 231         unsigned i;
 232         char *option;
 233
 234         if (!str) {
 235                 *cp = COMPUTE_DELTA;
 236                 return 0;
 237         }
 238
 239         option = strchr(str, ':');
 240         if (option) {
 241                 unsigned len = option++ - str;
 242
 243                 /*
 244                  * The str data are not writeable, so we need
 245                  * to use another buffer.
 246                  */
 247
 248                 /* No option value is longer. */
 249                 if (len >= sizeof(buf))
 250                         return -EINVAL;
 251
 252                 strncpy(buf, str, len);
 253                 buf[len] = 0x0;
 254                 cstr = buf;
 255         }
 256
 257         for (i = 0; i < COMPUTE_MAX; i++)
 258                 if (!strcmp(cstr, compute_names[i])) {
 259                         *cp = i;
 260                         return setup_compute_opt(option);
 261                 }
 262
 263         pr_err("Failed: '%s' is not computation method "
 264                "(use 'delta','ratio' or 'wdiff')\n", str);
 265         return -EINVAL;
 266 }
 267
 268 static double period_percent(struct hist_entry *he, u64 period)
 269 {
 270         u64 total = hists__total_period(he->hists);
 271
 272         return (period * 100.0) / total;
 273 }
 274
 275 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 276 {
 277         double old_percent = period_percent(he, he->stat.period);
 278         double new_percent = period_percent(pair, pair->stat.period);
 279
 280         pair->diff.period_ratio_delta = new_percent - old_percent;
 281         pair->diff.computed = true;
 282         return pair->diff.period_ratio_delta;
 283 }
 284
 285 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 286 {
 287         double old_period = he->stat.period ?: 1;
 288         double new_period = pair->stat.period;
 289
 290         pair->diff.computed = true;
 291         pair->diff.period_ratio = new_period / old_period;
 292         return pair->diff.period_ratio;
 293 }
 294
 295 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 296 {
 297         u64 old_period = he->stat.period;
 298         u64 new_period = pair->stat.period;
 299
 300         pair->diff.computed = true;
 301         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 302                            old_period * compute_wdiff_w1;
 303
 304         return pair->diff.wdiff;
 305 }
 306
 307 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 308                          char *buf, size_t size)
 309 {
 310         u64 he_total = he->hists->stats.total_period;
 311         u64 pair_total = pair->hists->stats.total_period;
 312
 313         if (symbol_conf.filter_relative) {
 314                 he_total = he->hists->stats.total_non_filtered_period;
 315                 pair_total = pair->hists->stats.total_non_filtered_period;
 316         }
 317         return scnprintf(buf, size,
 318                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 319                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 320                          pair->stat.period, pair_total,
 321                          he->stat.period, he_total);
 322 }
 323
 324 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 325                          char *buf, size_t size)
 326 {
 327         double old_period = he->stat.period;
 328         double new_period = pair->stat.period;
 329
 330         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 331 }
 332
 333 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 334                          char *buf, size_t size)
 335 {
 336         u64 old_period = he->stat.period;
 337         u64 new_period = pair->stat.period;
 338
 339         return scnprintf(buf, size,
 340                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 341                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 342 }
 343
 344 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 345                            char *buf, size_t size)
 346 {
 347         switch (compute) {
 348         case COMPUTE_DELTA:
 349         case COMPUTE_DELTA_ABS:
 350                 return formula_delta(he, pair, buf, size);
 351         case COMPUTE_RATIO:
 352                 return formula_ratio(he, pair, buf, size);
 353         case COMPUTE_WEIGHTED_DIFF:
 354                 return formula_wdiff(he, pair, buf, size);
 355         default:
 356                 BUG_ON(1);
 357         }
 358
 359         return -1;
 360 }
 361
 362 static void *block_hist_zalloc(size_t size)
 363 {
 364         struct block_hist *bh;
 365
 366         bh = zalloc(size + sizeof(*bh));
 367         if (!bh)
 368                 return NULL;
 369
 370         return &bh->he;
 371 }
 372
 373 static void block_hist_free(void *he)
 374 {
 375         struct block_hist *bh;
 376
 377         bh = container_of(he, struct block_hist, he);
 378         hists__delete_entries(&bh->block_hists);
 379         free(bh);
 380 }
 381
 382 struct hist_entry_ops block_hist_ops = {
 383         .new    = block_hist_zalloc,
 384         .free   = block_hist_free,
 385 };
 386
 387 static int diff__process_sample_event(struct perf_tool *tool,
 388                                       union perf_event *event,
 389                                       struct perf_sample *sample,
 390                                       struct evsel *evsel,
 391                                       struct machine *machine)
 392 {
 393         struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
 394         struct addr_location al;
 395         struct hists *hists = evsel__hists(evsel);
 396         int ret = -1;
 397
 398         if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
 399                                           sample->time)) {
 400                 return 0;
 401         }
 402
 403         if (machine__resolve(machine, &al, sample) < 0) {
 404                 pr_warning("problem processing %d event, skipping it.\n",
 405                            event->header.type);
 406                 return -1;
 407         }
 408
 409         if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
 410                 ret = 0;
 411                 goto out_put;
 412         }
 413
 414         if (compute != COMPUTE_CYCLES) {
 415                 if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
 416                                       true)) {
 417                         pr_warning("problem incrementing symbol period, "
 418                                    "skipping event\n");
 419                         goto out_put;
 420                 }
 421         } else {
 422                 if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
 423                                           NULL, NULL, sample, true)) {
 424                         pr_warning("problem incrementing symbol period, "
 425                                    "skipping event\n");
 426                         goto out_put;
 427                 }
 428
 429                 hist__account_cycles(sample->branch_stack, &al, sample, false,
 430                                      NULL);
 431         }
 432
 433         /*
 434          * The total_period is updated here before going to the output
 435          * tree since normally only the baseline hists will call
 436          * hists__output_resort() and precompute needs the total
 437          * period in order to sort entries by percentage delta.
 438          */
 439         hists->stats.total_period += sample->period;
 440         if (!al.filtered)
 441                 hists->stats.total_non_filtered_period += sample->period;
 442         ret = 0;
 443 out_put:
 444         addr_location__put(&al);
 445         return ret;
 446 }
 447
 448 static struct perf_diff pdiff = {
 449         .tool = {
 450                 .sample = diff__process_sample_event,
 451                 .mmap   = perf_event__process_mmap,
 452                 .mmap2  = perf_event__process_mmap2,
 453                 .comm   = perf_event__process_comm,
 454                 .exit   = perf_event__process_exit,
 455                 .fork   = perf_event__process_fork,
 456                 .lost   = perf_event__process_lost,
 457                 .namespaces = perf_event__process_namespaces,
 458                 .cgroup = perf_event__process_cgroup,
 459                 .ordered_events = true,
 460                 .ordering_requires_timestamps = true,
 461         },
 462 };
 463
 464 static struct evsel *evsel_match(struct evsel *evsel,
 465                                       struct evlist *evlist)
 466 {
 467         struct evsel *e;
 468
 469         evlist__for_each_entry(evlist, e) {
 470                 if (evsel__match2(evsel, e))
 471                         return e;
 472         }
 473
 474         return NULL;
 475 }
 476
 477 static void perf_evlist__collapse_resort(struct evlist *evlist)
 478 {
 479         struct evsel *evsel;
 480
 481         evlist__for_each_entry(evlist, evsel) {
 482                 struct hists *hists = evsel__hists(evsel);
 483
 484                 hists__collapse_resort(hists, NULL);
 485         }
 486 }
 487
 488 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 489 {
 490         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 491         void *ptr = dfmt - dfmt->idx;
 492         struct data__file *d = container_of(ptr, struct data__file, fmt);
 493
 494         return d;
 495 }
 496
 497 static struct hist_entry*
 498 get_pair_data(struct hist_entry *he, struct data__file *d)
 499 {
 500         if (hist_entry__has_pairs(he)) {
 501                 struct hist_entry *pair;
 502
 503                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 504                         if (pair->hists == d->hists)
 505                                 return pair;
 506         }
 507
 508         return NULL;
 509 }
 510
 511 static struct hist_entry*
 512 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 513 {
 514         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 515
 516         return get_pair_data(he, d);
 517 }
 518
 519 static void hists__baseline_only(struct hists *hists)
 520 {
 521         struct rb_root_cached *root;
 522         struct rb_node *next;
 523
 524         if (hists__has(hists, need_collapse))
 525                 root = &hists->entries_collapsed;
 526         else
 527                 root = hists->entries_in;
 528
 529         next = rb_first_cached(root);
 530         while (next != NULL) {
 531                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 532
 533                 next = rb_next(&he->rb_node_in);
 534                 if (!hist_entry__next_pair(he)) {
 535                         rb_erase_cached(&he->rb_node_in, root);
 536                         hist_entry__delete(he);
 537                 }
 538         }
 539 }
 540
 541 static int64_t block_cycles_diff_cmp(struct hist_entry *left,
 542                                      struct hist_entry *right)
 543 {
 544         bool pairs_left  = hist_entry__has_pairs(left);
 545         bool pairs_right = hist_entry__has_pairs(right);
 546         s64 l, r;
 547
 548         if (!pairs_left && !pairs_right)
 549                 return 0;
 550
 551         l = llabs(left->diff.cycles);
 552         r = llabs(right->diff.cycles);
 553         return r - l;
 554 }
 555
 556 static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
 557                           struct hist_entry *left, struct hist_entry *right)
 558 {
 559         return block_cycles_diff_cmp(right, left);
 560 }
 561
 562 static void init_block_hist(struct block_hist *bh)
 563 {
 564         __hists__init(&bh->block_hists, &bh->block_list);
 565         perf_hpp_list__init(&bh->block_list);
 566
 567         INIT_LIST_HEAD(&bh->block_fmt.list);
 568         INIT_LIST_HEAD(&bh->block_fmt.sort_list);
 569         bh->block_fmt.cmp = block_info__cmp;
 570         bh->block_fmt.sort = block_sort;
 571         perf_hpp_list__register_sort_field(&bh->block_list,
 572                                            &bh->block_fmt);
 573         bh->valid = true;
 574 }
 575
 576 static struct hist_entry *get_block_pair(struct hist_entry *he,
 577                                          struct hists *hists_pair)
 578 {
 579         struct rb_root_cached *root = hists_pair->entries_in;
 580         struct rb_node *next = rb_first_cached(root);
 581         int64_t cmp;
 582
 583         while (next != NULL) {
 584                 struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
 585                                                       rb_node_in);
 586
 587                 next = rb_next(&he_pair->rb_node_in);
 588
 589                 cmp = __block_info__cmp(he_pair, he);
 590                 if (!cmp)
 591                         return he_pair;
 592         }
 593
 594         return NULL;
 595 }
 596
 597 static void init_spark_values(unsigned long *svals, int num)
 598 {
 599         for (int i = 0; i < num; i++)
 600                 svals[i] = 0;
 601 }
 602
 603 static void update_spark_value(unsigned long *svals, int num,
 604                                struct stats *stats, u64 val)
 605 {
 606         int n = stats->n;
 607
 608         if (n < num)
 609                 svals[n] = val;
 610 }
 611
 612 static void compute_cycles_diff(struct hist_entry *he,
 613                                 struct hist_entry *pair)
 614 {
 615         pair->diff.computed = true;
 616         if (pair->block_info->num && he->block_info->num) {
 617                 pair->diff.cycles =
 618                         pair->block_info->cycles_aggr / pair->block_info->num_aggr -
 619                         he->block_info->cycles_aggr / he->block_info->num_aggr;
 620
 621                 if (!cycles_hist)
 622                         return;
 623
 624                 init_stats(&pair->diff.stats);
 625                 init_spark_values(pair->diff.svals, NUM_SPARKS);
 626
 627                 for (int i = 0; i < pair->block_info->num; i++) {
 628                         u64 val;
 629
 630                         if (i >= he->block_info->num || i >= NUM_SPARKS)
 631                                 break;
 632
 633                         val = llabs(pair->block_info->cycles_spark[i] -
 634                                      he->block_info->cycles_spark[i]);
 635
 636                         update_spark_value(pair->diff.svals, NUM_SPARKS,
 637                                            &pair->diff.stats, val);
 638                         update_stats(&pair->diff.stats, val);
 639                 }
 640         }
 641 }
 642
 643 static void block_hists_match(struct hists *hists_base,
 644                               struct hists *hists_pair)
 645 {
 646         struct rb_root_cached *root = hists_base->entries_in;
 647         struct rb_node *next = rb_first_cached(root);
 648
 649         while (next != NULL) {
 650                 struct hist_entry *he = rb_entry(next, struct hist_entry,
 651                                                  rb_node_in);
 652                 struct hist_entry *pair = get_block_pair(he, hists_pair);
 653
 654                 next = rb_next(&he->rb_node_in);
 655
 656                 if (pair) {
 657                         hist_entry__add_pair(pair, he);
 658                         compute_cycles_diff(he, pair);
 659                 }
 660         }
 661 }
 662
 663 static void hists__precompute(struct hists *hists)
 664 {
 665         struct rb_root_cached *root;
 666         struct rb_node *next;
 667
 668         if (hists__has(hists, need_collapse))
 669                 root = &hists->entries_collapsed;
 670         else
 671                 root = hists->entries_in;
 672
 673         next = rb_first_cached(root);
 674         while (next != NULL) {
 675                 struct block_hist *bh, *pair_bh;
 676                 struct hist_entry *he, *pair;
 677                 struct data__file *d;
 678                 int i;
 679
 680                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 681                 next = rb_next(&he->rb_node_in);
 682
 683                 if (compute == COMPUTE_CYCLES) {
 684                         bh = container_of(he, struct block_hist, he);
 685                         init_block_hist(bh);
 686                         block_info__process_sym(he, bh, NULL, 0);
 687                 }
 688
 689                 data__for_each_file_new(i, d) {
 690                         pair = get_pair_data(he, d);
 691                         if (!pair)
 692                                 continue;
 693
 694                         switch (compute) {
 695                         case COMPUTE_DELTA:
 696                         case COMPUTE_DELTA_ABS:
 697                                 compute_delta(he, pair);
 698                                 break;
 699                         case COMPUTE_RATIO:
 700                                 compute_ratio(he, pair);
 701                                 break;
 702                         case COMPUTE_WEIGHTED_DIFF:
 703                                 compute_wdiff(he, pair);
 704                                 break;
 705                         case COMPUTE_CYCLES:
 706                                 pair_bh = container_of(pair, struct block_hist,
 707                                                        he);
 708                                 init_block_hist(pair_bh);
 709                                 block_info__process_sym(pair, pair_bh, NULL, 0);
 710
 711                                 bh = container_of(he, struct block_hist, he);
 712
 713                                 if (bh->valid && pair_bh->valid) {
 714                                         block_hists_match(&bh->block_hists,
 715                                                           &pair_bh->block_hists);
 716                                         hists__output_resort(&pair_bh->block_hists,
 717                                                              NULL);
 718                                 }
 719                                 break;
 720                         default:
 721                                 BUG_ON(1);
 722                         }
 723                 }
 724         }
 725 }
 726
 727 static int64_t cmp_doubles(double l, double r)
 728 {
 729         if (l > r)
 730                 return -1;
 731         else if (l < r)
 732                 return 1;
 733         else
 734                 return 0;
 735 }
 736
 737 static int64_t
 738 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 739                         int c)
 740 {
 741         switch (c) {
 742         case COMPUTE_DELTA:
 743         {
 744                 double l = left->diff.period_ratio_delta;
 745                 double r = right->diff.period_ratio_delta;
 746
 747                 return cmp_doubles(l, r);
 748         }
 749         case COMPUTE_DELTA_ABS:
 750         {
 751                 double l = fabs(left->diff.period_ratio_delta);
 752                 double r = fabs(right->diff.period_ratio_delta);
 753
 754                 return cmp_doubles(l, r);
 755         }
 756         case COMPUTE_RATIO:
 757         {
 758                 double l = left->diff.period_ratio;
 759                 double r = right->diff.period_ratio;
 760
 761                 return cmp_doubles(l, r);
 762         }
 763         case COMPUTE_WEIGHTED_DIFF:
 764         {
 765                 s64 l = left->diff.wdiff;
 766                 s64 r = right->diff.wdiff;
 767
 768                 return r - l;
 769         }
 770         default:
 771                 BUG_ON(1);
 772         }
 773
 774         return 0;
 775 }
 776
 777 static int64_t
 778 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 779                         int c, int sort_idx)
 780 {
 781         bool pairs_left  = hist_entry__has_pairs(left);
 782         bool pairs_right = hist_entry__has_pairs(right);
 783         struct hist_entry *p_right, *p_left;
 784
 785         if (!pairs_left && !pairs_right)
 786                 return 0;
 787
 788         if (!pairs_left || !pairs_right)
 789                 return pairs_left ? -1 : 1;
 790
 791         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 792         p_right = get_pair_data(right, &data__files[sort_idx]);
 793
 794         if (!p_left && !p_right)
 795                 return 0;
 796
 797         if (!p_left || !p_right)
 798                 return p_left ? -1 : 1;
 799
 800         /*
 801          * We have 2 entries of same kind, let's
 802          * make the data comparison.
 803          */
 804         return __hist_entry__cmp_compute(p_left, p_right, c);
 805 }
 806
 807 static int64_t
 808 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 809                             int c, int sort_idx)
 810 {
 811         struct hist_entry *p_right, *p_left;
 812
 813         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 814         p_right = get_pair_data(right, &data__files[sort_idx]);
 815
 816         if (!p_left && !p_right)
 817                 return 0;
 818
 819         if (!p_left || !p_right)
 820                 return p_left ? -1 : 1;
 821
 822         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 823                 /*
 824                  * The delta can be computed without the baseline, but
 825                  * others are not.  Put those entries which have no
 826                  * values below.
 827                  */
 828                 if (left->dummy && right->dummy)
 829                         return 0;
 830
 831                 if (left->dummy || right->dummy)
 832                         return left->dummy ? 1 : -1;
 833         }
 834
 835         return __hist_entry__cmp_compute(p_left, p_right, c);
 836 }
 837
 838 static int64_t
 839 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 840                     struct hist_entry *left __maybe_unused,
 841                     struct hist_entry *right __maybe_unused)
 842 {
 843         return 0;
 844 }
 845
 846 static int64_t
 847 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 848                          struct hist_entry *left, struct hist_entry *right)
 849 {
 850         if (left->stat.period == right->stat.period)
 851                 return 0;
 852         return left->stat.period > right->stat.period ? 1 : -1;
 853 }
 854
 855 static int64_t
 856 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 857                       struct hist_entry *left, struct hist_entry *right)
 858 {
 859         struct data__file *d = fmt_to_data_file(fmt);
 860
 861         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 862 }
 863
 864 static int64_t
 865 hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
 866                       struct hist_entry *left, struct hist_entry *right)
 867 {
 868         struct data__file *d = fmt_to_data_file(fmt);
 869
 870         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
 871 }
 872
 873 static int64_t
 874 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 875                       struct hist_entry *left, struct hist_entry *right)
 876 {
 877         struct data__file *d = fmt_to_data_file(fmt);
 878
 879         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 880 }
 881
 882 static int64_t
 883 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 884                       struct hist_entry *left, struct hist_entry *right)
 885 {
 886         struct data__file *d = fmt_to_data_file(fmt);
 887
 888         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 889 }
 890
 891 static int64_t
 892 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 893                           struct hist_entry *left, struct hist_entry *right)
 894 {
 895         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 896                                            sort_compute);
 897 }
 898
 899 static int64_t
 900 hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 901                               struct hist_entry *left, struct hist_entry *right)
 902 {
 903         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
 904                                            sort_compute);
 905 }
 906
 907 static int64_t
 908 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 909                           struct hist_entry *left, struct hist_entry *right)
 910 {
 911         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 912                                            sort_compute);
 913 }
 914
 915 static int64_t
 916 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 917                           struct hist_entry *left, struct hist_entry *right)
 918 {
 919         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 920                                            sort_compute);
 921 }
 922
 923 static void hists__process(struct hists *hists)
 924 {
 925         if (show_baseline_only)
 926                 hists__baseline_only(hists);
 927
 928         hists__precompute(hists);
 929         hists__output_resort(hists, NULL);
 930
 931         if (compute == COMPUTE_CYCLES)
 932                 symbol_conf.report_block = true;
 933
 934         hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
 935                        !symbol_conf.use_callchain);
 936 }
 937
 938 static void data__fprintf(void)
 939 {
 940         struct data__file *d;
 941         int i;
 942
 943         fprintf(stdout, "# Data files:\n");
 944
 945         data__for_each_file(i, d)
 946                 fprintf(stdout, "#  [%d] %s %s\n",
 947                         d->idx, d->data.path,
 948                         !d->idx ? "(Baseline)" : "");
 949
 950         fprintf(stdout, "#\n");
 951 }
 952
 953 static void data_process(void)
 954 {
 955         struct evlist *evlist_base = data__files[0].session->evlist;
 956         struct evsel *evsel_base;
 957         bool first = true;
 958
 959         evlist__for_each_entry(evlist_base, evsel_base) {
 960                 struct hists *hists_base = evsel__hists(evsel_base);
 961                 struct data__file *d;
 962                 int i;
 963
 964                 data__for_each_file_new(i, d) {
 965                         struct evlist *evlist = d->session->evlist;
 966                         struct evsel *evsel;
 967                         struct hists *hists;
 968
 969                         evsel = evsel_match(evsel_base, evlist);
 970                         if (!evsel)
 971                                 continue;
 972
 973                         hists = evsel__hists(evsel);
 974                         d->hists = hists;
 975
 976                         hists__match(hists_base, hists);
 977
 978                         if (!show_baseline_only)
 979                                 hists__link(hists_base, hists);
 980                 }
 981
 982                 if (!quiet) {
 983                         fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 984                                 evsel__name(evsel_base));
 985                 }
 986
 987                 first = false;
 988
 989                 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
 990                         data__fprintf();
 991
 992                 /* Don't sort callchain for perf diff */
 993                 evsel__reset_sample_bit(evsel_base, CALLCHAIN);
 994
 995                 hists__process(hists_base);
 996         }
 997 }
 998
 999 static void data__free(struct data__file *d)
1000 {
1001         int col;
1002
1003         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1004                 struct diff_hpp_fmt *fmt = &d->fmt[col];
1005
1006                 zfree(&fmt->header);
1007         }
1008 }
1009
1010 static int abstime_str_dup(char **pstr)
1011 {
1012         char *str = NULL;
1013
1014         if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1015                 str = strdup(pdiff.time_str);
1016                 if (!str)
1017                         return -ENOMEM;
1018         }
1019
1020         *pstr = str;
1021         return 0;
1022 }
1023
1024 static int parse_absolute_time(struct data__file *d, char **pstr)
1025 {
1026         char *p = *pstr;
1027         int ret;
1028
1029         /*
1030          * Absolute timestamp for one file has the format: a.b,c.d
1031          * For multiple files, the format is: a.b,c.d:a.b,c.d
1032          */
1033         p = strchr(*pstr, ':');
1034         if (p) {
1035                 if (p == *pstr) {
1036                         pr_err("Invalid time string\n");
1037                         return -EINVAL;
1038                 }
1039
1040                 *p = 0;
1041                 p++;
1042                 if (*p == 0) {
1043                         pr_err("Invalid time string\n");
1044                         return -EINVAL;
1045                 }
1046         }
1047
1048         ret = perf_time__parse_for_ranges(*pstr, d->session,
1049                                           &pdiff.ptime_range,
1050                                           &pdiff.range_size,
1051                                           &pdiff.range_num);
1052         if (ret < 0)
1053                 return ret;
1054
1055         if (!p || *p == 0)
1056                 *pstr = NULL;
1057         else
1058                 *pstr = p;
1059
1060         return ret;
1061 }
1062
1063 static int parse_percent_time(struct data__file *d)
1064 {
1065         int ret;
1066
1067         ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1068                                           &pdiff.ptime_range,
1069                                           &pdiff.range_size,
1070                                           &pdiff.range_num);
1071         return ret;
1072 }
1073
1074 static int parse_time_str(struct data__file *d, char *abstime_ostr,
1075                            char **pabstime_tmp)
1076 {
1077         int ret = 0;
1078
1079         if (abstime_ostr)
1080                 ret = parse_absolute_time(d, pabstime_tmp);
1081         else if (pdiff.time_str)
1082                 ret = parse_percent_time(d);
1083
1084         return ret;
1085 }
1086
1087 static int check_file_brstack(void)
1088 {
1089         struct data__file *d;
1090         bool has_br_stack;
1091         int i;
1092
1093         data__for_each_file(i, d) {
1094                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1095                 if (IS_ERR(d->session)) {
1096                         pr_err("Failed to open %s\n", d->data.path);
1097                         return PTR_ERR(d->session);
1098                 }
1099
1100                 has_br_stack = perf_header__has_feat(&d->session->header,
1101                                                      HEADER_BRANCH_STACK);
1102                 perf_session__delete(d->session);
1103                 if (!has_br_stack)
1104                         return 0;
1105         }
1106
1107         /* Set only all files having branch stacks */
1108         pdiff.has_br_stack = true;
1109         return 0;
1110 }
1111
1112 static int __cmd_diff(void)
1113 {
1114         struct data__file *d;
1115         int ret, i;
1116         char *abstime_ostr, *abstime_tmp;
1117
1118         ret = abstime_str_dup(&abstime_ostr);
1119         if (ret)
1120                 return ret;
1121
1122         abstime_tmp = abstime_ostr;
1123         ret = -EINVAL;
1124
1125         data__for_each_file(i, d) {
1126                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1127                 if (IS_ERR(d->session)) {
1128                         ret = PTR_ERR(d->session);
1129                         pr_err("Failed to open %s\n", d->data.path);
1130                         goto out_delete;
1131                 }
1132
1133                 if (pdiff.time_str) {
1134                         ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1135                         if (ret < 0)
1136                                 goto out_delete;
1137                 }
1138
1139                 if (cpu_list) {
1140                         ret = perf_session__cpu_bitmap(d->session, cpu_list,
1141                                                        cpu_bitmap);
1142                         if (ret < 0)
1143                                 goto out_delete;
1144                 }
1145
1146                 ret = perf_session__process_events(d->session);
1147                 if (ret) {
1148                         pr_err("Failed to process %s\n", d->data.path);
1149                         goto out_delete;
1150                 }
1151
1152                 perf_evlist__collapse_resort(d->session->evlist);
1153
1154                 if (pdiff.ptime_range)
1155                         zfree(&pdiff.ptime_range);
1156         }
1157
1158         data_process();
1159
1160  out_delete:
1161         data__for_each_file(i, d) {
1162                 perf_session__delete(d->session);
1163                 data__free(d);
1164         }
1165
1166         free(data__files);
1167
1168         if (pdiff.ptime_range)
1169                 zfree(&pdiff.ptime_range);
1170
1171         if (abstime_ostr)
1172                 free(abstime_ostr);
1173
1174         return ret;
1175 }
1176
1177 static const char * const diff_usage[] = {
1178         "perf diff [<options>] [old_file] [new_file]",
1179         NULL,
1180 };
1181
1182 static const struct option options[] = {
1183         OPT_INCR('v', "verbose", &verbose,
1184                     "be more verbose (show symbol address, etc)"),
1185         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
1186         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1187                     "Show only items with match in baseline"),
1188         OPT_CALLBACK('c', "compute", &compute,
1189                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1190                      "Entries differential computation selection",
1191                      setup_compute),
1192         OPT_BOOLEAN('p', "period", &show_period,
1193                     "Show period values."),
1194         OPT_BOOLEAN('F', "formula", &show_formula,
1195                     "Show formula."),
1196         OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1197                     "Show cycles histogram and standard deviation "
1198                     "- WARNING: use only with -c cycles."),
1199         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1200                     "dump raw trace in ASCII"),
1201         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1202         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1203                    "file", "kallsyms pathname"),
1204         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1205                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
1206         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1207                    "only consider symbols in these dsos"),
1208         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1209                    "only consider symbols in these comms"),
1210         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1211                    "only consider these symbols"),
1212         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1213                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1214                    " Please refer the man page for the complete list."),
1215         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1216                    "separator for columns, no spaces will be added between "
1217                    "columns '.' is reserved."),
1218         OPT_CALLBACK(0, "symfs", NULL, "directory",
1219                      "Look for files with symbols relative to this directory",
1220                      symbol__config_symfs),
1221         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1222         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1223                      "How to display percentage of filtered entries", parse_filter_percentage),
1224         OPT_STRING(0, "time", &pdiff.time_str, "str",
1225                    "Time span (time percent or absolute timestamp)"),
1226         OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1227         OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1228                    "only consider symbols in these pids"),
1229         OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1230                    "only consider symbols in these tids"),
1231         OPT_END()
1232 };
1233
1234 static double baseline_percent(struct hist_entry *he)
1235 {
1236         u64 total = hists__total_period(he->hists);
1237
1238         return 100.0 * he->stat.period / total;
1239 }
1240
1241 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1242                                struct perf_hpp *hpp, struct hist_entry *he)
1243 {
1244         struct diff_hpp_fmt *dfmt =
1245                 container_of(fmt, struct diff_hpp_fmt, fmt);
1246         double percent = baseline_percent(he);
1247         char pfmt[20] = " ";
1248
1249         if (!he->dummy) {
1250                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1251                 return percent_color_snprintf(hpp->buf, hpp->size,
1252                                               pfmt, percent);
1253         } else
1254                 return scnprintf(hpp->buf, hpp->size, "%*s",
1255                                  dfmt->header_width, pfmt);
1256 }
1257
1258 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1259 {
1260         double percent = baseline_percent(he);
1261         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1262         int ret = 0;
1263
1264         if (!he->dummy)
1265                 ret = scnprintf(buf, size, fmt, percent);
1266
1267         return ret;
1268 }
1269
1270 static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1271                          struct perf_hpp *hpp, int width)
1272 {
1273         struct block_hist *bh = container_of(he, struct block_hist, he);
1274         struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1275         struct hist_entry *block_he;
1276         struct block_info *bi;
1277         char buf[128];
1278         char *start_line, *end_line;
1279
1280         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1281         if (!block_he) {
1282                 hpp->skip = true;
1283                 return 0;
1284         }
1285
1286         /*
1287          * Avoid printing the warning "addr2line_init failed for ..."
1288          */
1289         symbol_conf.disable_add2line_warn = true;
1290
1291         bi = block_he->block_info;
1292
1293         start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1294                                   he->ms.sym);
1295
1296         end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1297                                 he->ms.sym);
1298
1299         if ((strncmp(start_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0) &&
1300             (strncmp(end_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)) {
1301                 scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1302                           start_line, end_line, block_he->diff.cycles);
1303         } else {
1304                 scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1305                           bi->start, bi->end, block_he->diff.cycles);
1306         }
1307
1308         free_srcline(start_line);
1309         free_srcline(end_line);
1310
1311         return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1312 }
1313
1314 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1315                                 struct perf_hpp *hpp, struct hist_entry *he,
1316                                 int comparison_method)
1317 {
1318         struct diff_hpp_fmt *dfmt =
1319                 container_of(fmt, struct diff_hpp_fmt, fmt);
1320         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1321         double diff;
1322         s64 wdiff;
1323         char pfmt[20] = " ";
1324
1325         if (!pair) {
1326                 if (comparison_method == COMPUTE_CYCLES) {
1327                         struct block_hist *bh;
1328
1329                         bh = container_of(he, struct block_hist, he);
1330                         if (bh->block_idx)
1331                                 hpp->skip = true;
1332                 }
1333
1334                 goto no_print;
1335         }
1336
1337         switch (comparison_method) {
1338         case COMPUTE_DELTA:
1339                 if (pair->diff.computed)
1340                         diff = pair->diff.period_ratio_delta;
1341                 else
1342                         diff = compute_delta(he, pair);
1343
1344                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1345                 return percent_color_snprintf(hpp->buf, hpp->size,
1346                                         pfmt, diff);
1347         case COMPUTE_RATIO:
1348                 if (he->dummy)
1349                         goto dummy_print;
1350                 if (pair->diff.computed)
1351                         diff = pair->diff.period_ratio;
1352                 else
1353                         diff = compute_ratio(he, pair);
1354
1355                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1356                 return value_color_snprintf(hpp->buf, hpp->size,
1357                                         pfmt, diff);
1358         case COMPUTE_WEIGHTED_DIFF:
1359                 if (he->dummy)
1360                         goto dummy_print;
1361                 if (pair->diff.computed)
1362                         wdiff = pair->diff.wdiff;
1363                 else
1364                         wdiff = compute_wdiff(he, pair);
1365
1366                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1367                 return color_snprintf(hpp->buf, hpp->size,
1368                                 get_percent_color(wdiff),
1369                                 pfmt, wdiff);
1370         case COMPUTE_CYCLES:
1371                 return cycles_printf(he, pair, hpp, dfmt->header_width);
1372         default:
1373                 BUG_ON(1);
1374         }
1375 dummy_print:
1376         return scnprintf(hpp->buf, hpp->size, "%*s",
1377                         dfmt->header_width, "N/A");
1378 no_print:
1379         return scnprintf(hpp->buf, hpp->size, "%*s",
1380                         dfmt->header_width, pfmt);
1381 }
1382
1383 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1384                         struct perf_hpp *hpp, struct hist_entry *he)
1385 {
1386         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1387 }
1388
1389 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1390                         struct perf_hpp *hpp, struct hist_entry *he)
1391 {
1392         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1393 }
1394
1395 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1396                         struct perf_hpp *hpp, struct hist_entry *he)
1397 {
1398         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1399 }
1400
1401 static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1402                              struct perf_hpp *hpp, struct hist_entry *he)
1403 {
1404         return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1405 }
1406
1407 static int all_zero(unsigned long *vals, int len)
1408 {
1409         int i;
1410
1411         for (i = 0; i < len; i++)
1412                 if (vals[i] != 0)
1413                         return 0;
1414         return 1;
1415 }
1416
1417 static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1418 {
1419         int printed;
1420
1421         if (n <= 1)
1422                 return 0;
1423
1424         if (n > NUM_SPARKS)
1425                 n = NUM_SPARKS;
1426         if (all_zero(svals, n))
1427                 return 0;
1428
1429         printed = print_spark(bf, size, svals, n);
1430         printed += scnprintf(bf + printed, size - printed, " ");
1431         return printed;
1432 }
1433
1434 static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1435                             struct perf_hpp *hpp, struct hist_entry *he)
1436 {
1437         struct diff_hpp_fmt *dfmt =
1438                 container_of(fmt, struct diff_hpp_fmt, fmt);
1439         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1440         struct block_hist *bh = container_of(he, struct block_hist, he);
1441         struct block_hist *bh_pair;
1442         struct hist_entry *block_he;
1443         char spark[32], buf[128];
1444         double r;
1445         int ret, pad;
1446
1447         if (!pair) {
1448                 if (bh->block_idx)
1449                         hpp->skip = true;
1450
1451                 goto no_print;
1452         }
1453
1454         bh_pair = container_of(pair, struct block_hist, he);
1455
1456         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1457         if (!block_he) {
1458                 hpp->skip = true;
1459                 goto no_print;
1460         }
1461
1462         ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1463                                  block_he->diff.stats.n);
1464
1465         r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1466                              avg_stats(&block_he->diff.stats));
1467
1468         if (ret) {
1469                 /*
1470                  * Padding spaces if number of sparks less than NUM_SPARKS
1471                  * otherwise the output is not aligned.
1472                  */
1473                 pad = NUM_SPARKS - ((ret - 1) / 3);
1474                 scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1475                 ret = scnprintf(hpp->buf, hpp->size, "%*s",
1476                                 dfmt->header_width, buf);
1477
1478                 if (pad) {
1479                         ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1480                                          "%-*s", pad, " ");
1481                 }
1482
1483                 return ret;
1484         }
1485
1486 no_print:
1487         return scnprintf(hpp->buf, hpp->size, "%*s",
1488                         dfmt->header_width, " ");
1489 }
1490
1491 static void
1492 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1493 {
1494         switch (idx) {
1495         case PERF_HPP_DIFF__PERIOD_BASELINE:
1496                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
1497                 break;
1498
1499         default:
1500                 break;
1501         }
1502 }
1503
1504 static void
1505 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1506                 int idx, char *buf, size_t size)
1507 {
1508         double diff;
1509         double ratio;
1510         s64 wdiff;
1511
1512         switch (idx) {
1513         case PERF_HPP_DIFF__DELTA:
1514         case PERF_HPP_DIFF__DELTA_ABS:
1515                 if (pair->diff.computed)
1516                         diff = pair->diff.period_ratio_delta;
1517                 else
1518                         diff = compute_delta(he, pair);
1519
1520                 scnprintf(buf, size, "%+4.2F%%", diff);
1521                 break;
1522
1523         case PERF_HPP_DIFF__RATIO:
1524                 /* No point for ratio number if we are dummy.. */
1525                 if (he->dummy) {
1526                         scnprintf(buf, size, "N/A");
1527                         break;
1528                 }
1529
1530                 if (pair->diff.computed)
1531                         ratio = pair->diff.period_ratio;
1532                 else
1533                         ratio = compute_ratio(he, pair);
1534
1535                 if (ratio > 0.0)
1536                         scnprintf(buf, size, "%14.6F", ratio);
1537                 break;
1538
1539         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1540                 /* No point for wdiff number if we are dummy.. */
1541                 if (he->dummy) {
1542                         scnprintf(buf, size, "N/A");
1543                         break;
1544                 }
1545
1546                 if (pair->diff.computed)
1547                         wdiff = pair->diff.wdiff;
1548                 else
1549                         wdiff = compute_wdiff(he, pair);
1550
1551                 if (wdiff != 0)
1552                         scnprintf(buf, size, "%14ld", wdiff);
1553                 break;
1554
1555         case PERF_HPP_DIFF__FORMULA:
1556                 formula_fprintf(he, pair, buf, size);
1557                 break;
1558
1559         case PERF_HPP_DIFF__PERIOD:
1560                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1561                 break;
1562
1563         default:
1564                 BUG_ON(1);
1565         }
1566 }
1567
1568 static void
1569 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1570                     char *buf, size_t size)
1571 {
1572         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1573         int idx = dfmt->idx;
1574
1575         /* baseline is special */
1576         if (idx == PERF_HPP_DIFF__BASELINE)
1577                 hpp__entry_baseline(he, buf, size);
1578         else {
1579                 if (pair)
1580                         hpp__entry_pair(he, pair, idx, buf, size);
1581                 else
1582                         hpp__entry_unpair(he, idx, buf, size);
1583         }
1584 }
1585
1586 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1587                              struct hist_entry *he)
1588 {
1589         struct diff_hpp_fmt *dfmt =
1590                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1591         char buf[MAX_COL_WIDTH] = " ";
1592
1593         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1594
1595         if (symbol_conf.field_sep)
1596                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1597         else
1598                 return scnprintf(hpp->buf, hpp->size, "%*s",
1599                                  dfmt->header_width, buf);
1600 }
1601
1602 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1603                        struct hists *hists __maybe_unused,
1604                        int line __maybe_unused,
1605                        int *span __maybe_unused)
1606 {
1607         struct diff_hpp_fmt *dfmt =
1608                 container_of(fmt, struct diff_hpp_fmt, fmt);
1609
1610         BUG_ON(!dfmt->header);
1611         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1612 }
1613
1614 static int hpp__width(struct perf_hpp_fmt *fmt,
1615                       struct perf_hpp *hpp __maybe_unused,
1616                       struct hists *hists __maybe_unused)
1617 {
1618         struct diff_hpp_fmt *dfmt =
1619                 container_of(fmt, struct diff_hpp_fmt, fmt);
1620
1621         BUG_ON(dfmt->header_width <= 0);
1622         return dfmt->header_width;
1623 }
1624
1625 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1626 {
1627 #define MAX_HEADER_NAME 100
1628         char buf_indent[MAX_HEADER_NAME];
1629         char buf[MAX_HEADER_NAME];
1630         const char *header = NULL;
1631         int width = 0;
1632
1633         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1634         header = columns[dfmt->idx].name;
1635         width  = columns[dfmt->idx].width;
1636
1637         /* Only our defined HPP fmts should appear here. */
1638         BUG_ON(!header);
1639
1640         if (data__files_cnt > 2)
1641                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1642
1643 #define NAME (data__files_cnt > 2 ? buf : header)
1644         dfmt->header_width = width;
1645         width = (int) strlen(NAME);
1646         if (dfmt->header_width < width)
1647                 dfmt->header_width = width;
1648
1649         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1650                   dfmt->header_width, NAME);
1651
1652         dfmt->header = strdup(buf_indent);
1653 #undef MAX_HEADER_NAME
1654 #undef NAME
1655 }
1656
1657 static void data__hpp_register(struct data__file *d, int idx)
1658 {
1659         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1660         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1661
1662         dfmt->idx = idx;
1663
1664         fmt->header = hpp__header;
1665         fmt->width  = hpp__width;
1666         fmt->entry  = hpp__entry_global;
1667         fmt->cmp    = hist_entry__cmp_nop;
1668         fmt->collapse = hist_entry__cmp_nop;
1669
1670         /* TODO more colors */
1671         switch (idx) {
1672         case PERF_HPP_DIFF__BASELINE:
1673                 fmt->color = hpp__color_baseline;
1674                 fmt->sort  = hist_entry__cmp_baseline;
1675                 break;
1676         case PERF_HPP_DIFF__DELTA:
1677                 fmt->color = hpp__color_delta;
1678                 fmt->sort  = hist_entry__cmp_delta;
1679                 break;
1680         case PERF_HPP_DIFF__RATIO:
1681                 fmt->color = hpp__color_ratio;
1682                 fmt->sort  = hist_entry__cmp_ratio;
1683                 break;
1684         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1685                 fmt->color = hpp__color_wdiff;
1686                 fmt->sort  = hist_entry__cmp_wdiff;
1687                 break;
1688         case PERF_HPP_DIFF__DELTA_ABS:
1689                 fmt->color = hpp__color_delta;
1690                 fmt->sort  = hist_entry__cmp_delta_abs;
1691                 break;
1692         case PERF_HPP_DIFF__CYCLES:
1693                 fmt->color = hpp__color_cycles;
1694                 fmt->sort  = hist_entry__cmp_nop;
1695                 break;
1696         case PERF_HPP_DIFF__CYCLES_HIST:
1697                 fmt->color = hpp__color_cycles_hist;
1698                 fmt->sort  = hist_entry__cmp_nop;
1699                 break;
1700         default:
1701                 fmt->sort  = hist_entry__cmp_nop;
1702                 break;
1703         }
1704
1705         init_header(d, dfmt);
1706         perf_hpp__column_register(fmt);
1707         perf_hpp__register_sort_field(fmt);
1708 }
1709
1710 static int ui_init(void)
1711 {
1712         struct data__file *d;
1713         struct perf_hpp_fmt *fmt;
1714         int i;
1715
1716         data__for_each_file(i, d) {
1717
1718                 /*
1719                  * Baseline or compute realted columns:
1720                  *
1721                  *   PERF_HPP_DIFF__BASELINE
1722                  *   PERF_HPP_DIFF__DELTA
1723                  *   PERF_HPP_DIFF__RATIO
1724                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1725                  *   PERF_HPP_DIFF__CYCLES
1726                  */
1727                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1728                                           PERF_HPP_DIFF__BASELINE);
1729
1730                 if (cycles_hist && i)
1731                         data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1732
1733                 /*
1734                  * And the rest:
1735                  *
1736                  * PERF_HPP_DIFF__FORMULA
1737                  * PERF_HPP_DIFF__PERIOD
1738                  * PERF_HPP_DIFF__PERIOD_BASELINE
1739                  */
1740                 if (show_formula && i)
1741                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1742
1743                 if (show_period)
1744                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1745                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1746         }
1747
1748         if (!sort_compute)
1749                 return 0;
1750
1751         /*
1752          * Prepend an fmt to sort on columns at 'sort_compute' first.
1753          * This fmt is added only to the sort list but not to the
1754          * output fields list.
1755          *
1756          * Note that this column (data) can be compared twice - one
1757          * for this 'sort_compute' fmt and another for the normal
1758          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1759          * will be sorted out by first try or baseline and comparing
1760          * is not a costly operation.
1761          */
1762         fmt = zalloc(sizeof(*fmt));
1763         if (fmt == NULL) {
1764                 pr_err("Memory allocation failed\n");
1765                 return -1;
1766         }
1767
1768         fmt->cmp      = hist_entry__cmp_nop;
1769         fmt->collapse = hist_entry__cmp_nop;
1770
1771         switch (compute) {
1772         case COMPUTE_DELTA:
1773                 fmt->sort = hist_entry__cmp_delta_idx;
1774                 break;
1775         case COMPUTE_RATIO:
1776                 fmt->sort = hist_entry__cmp_ratio_idx;
1777                 break;
1778         case COMPUTE_WEIGHTED_DIFF:
1779                 fmt->sort = hist_entry__cmp_wdiff_idx;
1780                 break;
1781         case COMPUTE_DELTA_ABS:
1782                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1783                 break;
1784         case COMPUTE_CYCLES:
1785                 /*
1786                  * Should set since 'fmt->sort' is called without
1787                  * checking valid during sorting
1788                  */
1789                 fmt->sort = hist_entry__cmp_nop;
1790                 break;
1791         default:
1792                 BUG_ON(1);
1793         }
1794
1795         perf_hpp__prepend_sort_field(fmt);
1796         return 0;
1797 }
1798
1799 static int data_init(int argc, const char **argv)
1800 {
1801         struct data__file *d;
1802         static const char *defaults[] = {
1803                 "perf.data.old",
1804                 "perf.data",
1805         };
1806         bool use_default = true;
1807         int i;
1808
1809         data__files_cnt = 2;
1810
1811         if (argc) {
1812                 if (argc == 1)
1813                         defaults[1] = argv[0];
1814                 else {
1815                         data__files_cnt = argc;
1816                         use_default = false;
1817                 }
1818         } else if (perf_guest) {
1819                 defaults[0] = "perf.data.host";
1820                 defaults[1] = "perf.data.guest";
1821         }
1822
1823         if (sort_compute >= (unsigned int) data__files_cnt) {
1824                 pr_err("Order option out of limit.\n");
1825                 return -EINVAL;
1826         }
1827
1828         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1829         if (!data__files)
1830                 return -ENOMEM;
1831
1832         data__for_each_file(i, d) {
1833                 struct perf_data *data = &d->data;
1834
1835                 data->path  = use_default ? defaults[i] : argv[i];
1836                 data->mode  = PERF_DATA_MODE_READ,
1837                 data->force = force,
1838
1839                 d->idx  = i;
1840         }
1841
1842         return 0;
1843 }
1844
1845 static int diff__config(const char *var, const char *value,
1846                         void *cb __maybe_unused)
1847 {
1848         if (!strcmp(var, "diff.order")) {
1849                 int ret;
1850                 if (perf_config_int(&ret, var, value) < 0)
1851                         return -1;
1852                 sort_compute = ret;
1853                 return 0;
1854         }
1855         if (!strcmp(var, "diff.compute")) {
1856                 if (!strcmp(value, "delta")) {
1857                         compute = COMPUTE_DELTA;
1858                 } else if (!strcmp(value, "delta-abs")) {
1859                         compute = COMPUTE_DELTA_ABS;
1860                 } else if (!strcmp(value, "ratio")) {
1861                         compute = COMPUTE_RATIO;
1862                 } else if (!strcmp(value, "wdiff")) {
1863                         compute = COMPUTE_WEIGHTED_DIFF;
1864                 } else {
1865                         pr_err("Invalid compute method: %s\n", value);
1866                         return -1;
1867                 }
1868         }
1869
1870         return 0;
1871 }
1872
1873 int cmd_diff(int argc, const char **argv)
1874 {
1875         int ret = hists__init();
1876
1877         if (ret < 0)
1878                 return ret;
1879
1880         perf_config(diff__config, NULL);
1881
1882         argc = parse_options(argc, argv, options, diff_usage, 0);
1883
1884         if (quiet)
1885                 perf_quiet_option();
1886
1887         if (cycles_hist && (compute != COMPUTE_CYCLES))
1888                 usage_with_options(diff_usage, options);
1889
1890         symbol__annotation_init();
1891
1892         if (symbol__init(NULL) < 0)
1893                 return -1;
1894
1895         if (data_init(argc, argv) < 0)
1896                 return -1;
1897
1898         if (check_file_brstack() < 0)
1899                 return -1;
1900
1901         if (compute == COMPUTE_CYCLES && !pdiff.has_br_stack)
1902                 return -1;
1903
1904         if (ui_init() < 0)
1905                 return -1;
1906
1907         sort__mode = SORT_MODE__DIFF;
1908
1909         if (setup_sorting(NULL) < 0)
1910                 usage_with_options(diff_usage, options);
1911
1912         setup_pager();
1913
1914         sort__setup_elide(NULL);
1915
1916         return __cmd_diff();
1917 }