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                 .ordered_events = true,
 459                 .ordering_requires_timestamps = true,
 460         },
 461 };
 462
 463 static struct evsel *evsel_match(struct evsel *evsel,
 464                                       struct evlist *evlist)
 465 {
 466         struct evsel *e;
 467
 468         evlist__for_each_entry(evlist, e) {
 469                 if (perf_evsel__match2(evsel, e))
 470                         return e;
 471         }
 472
 473         return NULL;
 474 }
 475
 476 static void perf_evlist__collapse_resort(struct evlist *evlist)
 477 {
 478         struct evsel *evsel;
 479
 480         evlist__for_each_entry(evlist, evsel) {
 481                 struct hists *hists = evsel__hists(evsel);
 482
 483                 hists__collapse_resort(hists, NULL);
 484         }
 485 }
 486
 487 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 488 {
 489         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 490         void *ptr = dfmt - dfmt->idx;
 491         struct data__file *d = container_of(ptr, struct data__file, fmt);
 492
 493         return d;
 494 }
 495
 496 static struct hist_entry*
 497 get_pair_data(struct hist_entry *he, struct data__file *d)
 498 {
 499         if (hist_entry__has_pairs(he)) {
 500                 struct hist_entry *pair;
 501
 502                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 503                         if (pair->hists == d->hists)
 504                                 return pair;
 505         }
 506
 507         return NULL;
 508 }
 509
 510 static struct hist_entry*
 511 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 512 {
 513         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 514
 515         return get_pair_data(he, d);
 516 }
 517
 518 static void hists__baseline_only(struct hists *hists)
 519 {
 520         struct rb_root_cached *root;
 521         struct rb_node *next;
 522
 523         if (hists__has(hists, need_collapse))
 524                 root = &hists->entries_collapsed;
 525         else
 526                 root = hists->entries_in;
 527
 528         next = rb_first_cached(root);
 529         while (next != NULL) {
 530                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 531
 532                 next = rb_next(&he->rb_node_in);
 533                 if (!hist_entry__next_pair(he)) {
 534                         rb_erase_cached(&he->rb_node_in, root);
 535                         hist_entry__delete(he);
 536                 }
 537         }
 538 }
 539
 540 static int64_t block_cycles_diff_cmp(struct hist_entry *left,
 541                                      struct hist_entry *right)
 542 {
 543         bool pairs_left  = hist_entry__has_pairs(left);
 544         bool pairs_right = hist_entry__has_pairs(right);
 545         s64 l, r;
 546
 547         if (!pairs_left && !pairs_right)
 548                 return 0;
 549
 550         l = llabs(left->diff.cycles);
 551         r = llabs(right->diff.cycles);
 552         return r - l;
 553 }
 554
 555 static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
 556                           struct hist_entry *left, struct hist_entry *right)
 557 {
 558         return block_cycles_diff_cmp(right, left);
 559 }
 560
 561 static void init_block_hist(struct block_hist *bh)
 562 {
 563         __hists__init(&bh->block_hists, &bh->block_list);
 564         perf_hpp_list__init(&bh->block_list);
 565
 566         INIT_LIST_HEAD(&bh->block_fmt.list);
 567         INIT_LIST_HEAD(&bh->block_fmt.sort_list);
 568         bh->block_fmt.cmp = block_info__cmp;
 569         bh->block_fmt.sort = block_sort;
 570         perf_hpp_list__register_sort_field(&bh->block_list,
 571                                            &bh->block_fmt);
 572         bh->valid = true;
 573 }
 574
 575 static struct hist_entry *get_block_pair(struct hist_entry *he,
 576                                          struct hists *hists_pair)
 577 {
 578         struct rb_root_cached *root = hists_pair->entries_in;
 579         struct rb_node *next = rb_first_cached(root);
 580         int64_t cmp;
 581
 582         while (next != NULL) {
 583                 struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
 584                                                       rb_node_in);
 585
 586                 next = rb_next(&he_pair->rb_node_in);
 587
 588                 cmp = __block_info__cmp(he_pair, he);
 589                 if (!cmp)
 590                         return he_pair;
 591         }
 592
 593         return NULL;
 594 }
 595
 596 static void init_spark_values(unsigned long *svals, int num)
 597 {
 598         for (int i = 0; i < num; i++)
 599                 svals[i] = 0;
 600 }
 601
 602 static void update_spark_value(unsigned long *svals, int num,
 603                                struct stats *stats, u64 val)
 604 {
 605         int n = stats->n;
 606
 607         if (n < num)
 608                 svals[n] = val;
 609 }
 610
 611 static void compute_cycles_diff(struct hist_entry *he,
 612                                 struct hist_entry *pair)
 613 {
 614         pair->diff.computed = true;
 615         if (pair->block_info->num && he->block_info->num) {
 616                 pair->diff.cycles =
 617                         pair->block_info->cycles_aggr / pair->block_info->num_aggr -
 618                         he->block_info->cycles_aggr / he->block_info->num_aggr;
 619
 620                 if (!cycles_hist)
 621                         return;
 622
 623                 init_stats(&pair->diff.stats);
 624                 init_spark_values(pair->diff.svals, NUM_SPARKS);
 625
 626                 for (int i = 0; i < pair->block_info->num; i++) {
 627                         u64 val;
 628
 629                         if (i >= he->block_info->num || i >= NUM_SPARKS)
 630                                 break;
 631
 632                         val = llabs(pair->block_info->cycles_spark[i] -
 633                                      he->block_info->cycles_spark[i]);
 634
 635                         update_spark_value(pair->diff.svals, NUM_SPARKS,
 636                                            &pair->diff.stats, val);
 637                         update_stats(&pair->diff.stats, val);
 638                 }
 639         }
 640 }
 641
 642 static void block_hists_match(struct hists *hists_base,
 643                               struct hists *hists_pair)
 644 {
 645         struct rb_root_cached *root = hists_base->entries_in;
 646         struct rb_node *next = rb_first_cached(root);
 647
 648         while (next != NULL) {
 649                 struct hist_entry *he = rb_entry(next, struct hist_entry,
 650                                                  rb_node_in);
 651                 struct hist_entry *pair = get_block_pair(he, hists_pair);
 652
 653                 next = rb_next(&he->rb_node_in);
 654
 655                 if (pair) {
 656                         hist_entry__add_pair(pair, he);
 657                         compute_cycles_diff(he, pair);
 658                 }
 659         }
 660 }
 661
 662 static void hists__precompute(struct hists *hists)
 663 {
 664         struct rb_root_cached *root;
 665         struct rb_node *next;
 666
 667         if (hists__has(hists, need_collapse))
 668                 root = &hists->entries_collapsed;
 669         else
 670                 root = hists->entries_in;
 671
 672         next = rb_first_cached(root);
 673         while (next != NULL) {
 674                 struct block_hist *bh, *pair_bh;
 675                 struct hist_entry *he, *pair;
 676                 struct data__file *d;
 677                 int i;
 678
 679                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 680                 next = rb_next(&he->rb_node_in);
 681
 682                 if (compute == COMPUTE_CYCLES) {
 683                         bh = container_of(he, struct block_hist, he);
 684                         init_block_hist(bh);
 685                         block_info__process_sym(he, bh, NULL, 0);
 686                 }
 687
 688                 data__for_each_file_new(i, d) {
 689                         pair = get_pair_data(he, d);
 690                         if (!pair)
 691                                 continue;
 692
 693                         switch (compute) {
 694                         case COMPUTE_DELTA:
 695                         case COMPUTE_DELTA_ABS:
 696                                 compute_delta(he, pair);
 697                                 break;
 698                         case COMPUTE_RATIO:
 699                                 compute_ratio(he, pair);
 700                                 break;
 701                         case COMPUTE_WEIGHTED_DIFF:
 702                                 compute_wdiff(he, pair);
 703                                 break;
 704                         case COMPUTE_CYCLES:
 705                                 pair_bh = container_of(pair, struct block_hist,
 706                                                        he);
 707                                 init_block_hist(pair_bh);
 708                                 block_info__process_sym(pair, pair_bh, NULL, 0);
 709
 710                                 bh = container_of(he, struct block_hist, he);
 711
 712                                 if (bh->valid && pair_bh->valid) {
 713                                         block_hists_match(&bh->block_hists,
 714                                                           &pair_bh->block_hists);
 715                                         hists__output_resort(&pair_bh->block_hists,
 716                                                              NULL);
 717                                 }
 718                                 break;
 719                         default:
 720                                 BUG_ON(1);
 721                         }
 722                 }
 723         }
 724 }
 725
 726 static int64_t cmp_doubles(double l, double r)
 727 {
 728         if (l > r)
 729                 return -1;
 730         else if (l < r)
 731                 return 1;
 732         else
 733                 return 0;
 734 }
 735
 736 static int64_t
 737 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 738                         int c)
 739 {
 740         switch (c) {
 741         case COMPUTE_DELTA:
 742         {
 743                 double l = left->diff.period_ratio_delta;
 744                 double r = right->diff.period_ratio_delta;
 745
 746                 return cmp_doubles(l, r);
 747         }
 748         case COMPUTE_DELTA_ABS:
 749         {
 750                 double l = fabs(left->diff.period_ratio_delta);
 751                 double r = fabs(right->diff.period_ratio_delta);
 752
 753                 return cmp_doubles(l, r);
 754         }
 755         case COMPUTE_RATIO:
 756         {
 757                 double l = left->diff.period_ratio;
 758                 double r = right->diff.period_ratio;
 759
 760                 return cmp_doubles(l, r);
 761         }
 762         case COMPUTE_WEIGHTED_DIFF:
 763         {
 764                 s64 l = left->diff.wdiff;
 765                 s64 r = right->diff.wdiff;
 766
 767                 return r - l;
 768         }
 769         default:
 770                 BUG_ON(1);
 771         }
 772
 773         return 0;
 774 }
 775
 776 static int64_t
 777 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 778                         int c, int sort_idx)
 779 {
 780         bool pairs_left  = hist_entry__has_pairs(left);
 781         bool pairs_right = hist_entry__has_pairs(right);
 782         struct hist_entry *p_right, *p_left;
 783
 784         if (!pairs_left && !pairs_right)
 785                 return 0;
 786
 787         if (!pairs_left || !pairs_right)
 788                 return pairs_left ? -1 : 1;
 789
 790         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 791         p_right = get_pair_data(right, &data__files[sort_idx]);
 792
 793         if (!p_left && !p_right)
 794                 return 0;
 795
 796         if (!p_left || !p_right)
 797                 return p_left ? -1 : 1;
 798
 799         /*
 800          * We have 2 entries of same kind, let's
 801          * make the data comparison.
 802          */
 803         return __hist_entry__cmp_compute(p_left, p_right, c);
 804 }
 805
 806 static int64_t
 807 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 808                             int c, int sort_idx)
 809 {
 810         struct hist_entry *p_right, *p_left;
 811
 812         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 813         p_right = get_pair_data(right, &data__files[sort_idx]);
 814
 815         if (!p_left && !p_right)
 816                 return 0;
 817
 818         if (!p_left || !p_right)
 819                 return p_left ? -1 : 1;
 820
 821         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 822                 /*
 823                  * The delta can be computed without the baseline, but
 824                  * others are not.  Put those entries which have no
 825                  * values below.
 826                  */
 827                 if (left->dummy && right->dummy)
 828                         return 0;
 829
 830                 if (left->dummy || right->dummy)
 831                         return left->dummy ? 1 : -1;
 832         }
 833
 834         return __hist_entry__cmp_compute(p_left, p_right, c);
 835 }
 836
 837 static int64_t
 838 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 839                     struct hist_entry *left __maybe_unused,
 840                     struct hist_entry *right __maybe_unused)
 841 {
 842         return 0;
 843 }
 844
 845 static int64_t
 846 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 847                          struct hist_entry *left, struct hist_entry *right)
 848 {
 849         if (left->stat.period == right->stat.period)
 850                 return 0;
 851         return left->stat.period > right->stat.period ? 1 : -1;
 852 }
 853
 854 static int64_t
 855 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 856                       struct hist_entry *left, struct hist_entry *right)
 857 {
 858         struct data__file *d = fmt_to_data_file(fmt);
 859
 860         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 861 }
 862
 863 static int64_t
 864 hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
 865                       struct hist_entry *left, struct hist_entry *right)
 866 {
 867         struct data__file *d = fmt_to_data_file(fmt);
 868
 869         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
 870 }
 871
 872 static int64_t
 873 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 874                       struct hist_entry *left, struct hist_entry *right)
 875 {
 876         struct data__file *d = fmt_to_data_file(fmt);
 877
 878         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 879 }
 880
 881 static int64_t
 882 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 883                       struct hist_entry *left, struct hist_entry *right)
 884 {
 885         struct data__file *d = fmt_to_data_file(fmt);
 886
 887         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 888 }
 889
 890 static int64_t
 891 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 892                           struct hist_entry *left, struct hist_entry *right)
 893 {
 894         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 895                                            sort_compute);
 896 }
 897
 898 static int64_t
 899 hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 900                               struct hist_entry *left, struct hist_entry *right)
 901 {
 902         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
 903                                            sort_compute);
 904 }
 905
 906 static int64_t
 907 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 908                           struct hist_entry *left, struct hist_entry *right)
 909 {
 910         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 911                                            sort_compute);
 912 }
 913
 914 static int64_t
 915 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 916                           struct hist_entry *left, struct hist_entry *right)
 917 {
 918         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 919                                            sort_compute);
 920 }
 921
 922 static void hists__process(struct hists *hists)
 923 {
 924         if (show_baseline_only)
 925                 hists__baseline_only(hists);
 926
 927         hists__precompute(hists);
 928         hists__output_resort(hists, NULL);
 929
 930         if (compute == COMPUTE_CYCLES)
 931                 symbol_conf.report_block = true;
 932
 933         hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
 934                        !symbol_conf.use_callchain);
 935 }
 936
 937 static void data__fprintf(void)
 938 {
 939         struct data__file *d;
 940         int i;
 941
 942         fprintf(stdout, "# Data files:\n");
 943
 944         data__for_each_file(i, d)
 945                 fprintf(stdout, "#  [%d] %s %s\n",
 946                         d->idx, d->data.path,
 947                         !d->idx ? "(Baseline)" : "");
 948
 949         fprintf(stdout, "#\n");
 950 }
 951
 952 static void data_process(void)
 953 {
 954         struct evlist *evlist_base = data__files[0].session->evlist;
 955         struct evsel *evsel_base;
 956         bool first = true;
 957
 958         evlist__for_each_entry(evlist_base, evsel_base) {
 959                 struct hists *hists_base = evsel__hists(evsel_base);
 960                 struct data__file *d;
 961                 int i;
 962
 963                 data__for_each_file_new(i, d) {
 964                         struct evlist *evlist = d->session->evlist;
 965                         struct evsel *evsel;
 966                         struct hists *hists;
 967
 968                         evsel = evsel_match(evsel_base, evlist);
 969                         if (!evsel)
 970                                 continue;
 971
 972                         hists = evsel__hists(evsel);
 973                         d->hists = hists;
 974
 975                         hists__match(hists_base, hists);
 976
 977                         if (!show_baseline_only)
 978                                 hists__link(hists_base, hists);
 979                 }
 980
 981                 if (!quiet) {
 982                         fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 983                                 perf_evsel__name(evsel_base));
 984                 }
 985
 986                 first = false;
 987
 988                 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
 989                         data__fprintf();
 990
 991                 /* Don't sort callchain for perf diff */
 992                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
 993
 994                 hists__process(hists_base);
 995         }
 996 }
 997
 998 static void data__free(struct data__file *d)
 999 {
1000         int col;
1001
1002         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1003                 struct diff_hpp_fmt *fmt = &d->fmt[col];
1004
1005                 zfree(&fmt->header);
1006         }
1007 }
1008
1009 static int abstime_str_dup(char **pstr)
1010 {
1011         char *str = NULL;
1012
1013         if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1014                 str = strdup(pdiff.time_str);
1015                 if (!str)
1016                         return -ENOMEM;
1017         }
1018
1019         *pstr = str;
1020         return 0;
1021 }
1022
1023 static int parse_absolute_time(struct data__file *d, char **pstr)
1024 {
1025         char *p = *pstr;
1026         int ret;
1027
1028         /*
1029          * Absolute timestamp for one file has the format: a.b,c.d
1030          * For multiple files, the format is: a.b,c.d:a.b,c.d
1031          */
1032         p = strchr(*pstr, ':');
1033         if (p) {
1034                 if (p == *pstr) {
1035                         pr_err("Invalid time string\n");
1036                         return -EINVAL;
1037                 }
1038
1039                 *p = 0;
1040                 p++;
1041                 if (*p == 0) {
1042                         pr_err("Invalid time string\n");
1043                         return -EINVAL;
1044                 }
1045         }
1046
1047         ret = perf_time__parse_for_ranges(*pstr, d->session,
1048                                           &pdiff.ptime_range,
1049                                           &pdiff.range_size,
1050                                           &pdiff.range_num);
1051         if (ret < 0)
1052                 return ret;
1053
1054         if (!p || *p == 0)
1055                 *pstr = NULL;
1056         else
1057                 *pstr = p;
1058
1059         return ret;
1060 }
1061
1062 static int parse_percent_time(struct data__file *d)
1063 {
1064         int ret;
1065
1066         ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1067                                           &pdiff.ptime_range,
1068                                           &pdiff.range_size,
1069                                           &pdiff.range_num);
1070         return ret;
1071 }
1072
1073 static int parse_time_str(struct data__file *d, char *abstime_ostr,
1074                            char **pabstime_tmp)
1075 {
1076         int ret = 0;
1077
1078         if (abstime_ostr)
1079                 ret = parse_absolute_time(d, pabstime_tmp);
1080         else if (pdiff.time_str)
1081                 ret = parse_percent_time(d);
1082
1083         return ret;
1084 }
1085
1086 static int check_file_brstack(void)
1087 {
1088         struct data__file *d;
1089         bool has_br_stack;
1090         int i;
1091
1092         data__for_each_file(i, d) {
1093                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1094                 if (IS_ERR(d->session)) {
1095                         pr_err("Failed to open %s\n", d->data.path);
1096                         return PTR_ERR(d->session);
1097                 }
1098
1099                 has_br_stack = perf_header__has_feat(&d->session->header,
1100                                                      HEADER_BRANCH_STACK);
1101                 perf_session__delete(d->session);
1102                 if (!has_br_stack)
1103                         return 0;
1104         }
1105
1106         /* Set only all files having branch stacks */
1107         pdiff.has_br_stack = true;
1108         return 0;
1109 }
1110
1111 static int __cmd_diff(void)
1112 {
1113         struct data__file *d;
1114         int ret, i;
1115         char *abstime_ostr, *abstime_tmp;
1116
1117         ret = abstime_str_dup(&abstime_ostr);
1118         if (ret)
1119                 return ret;
1120
1121         abstime_tmp = abstime_ostr;
1122         ret = -EINVAL;
1123
1124         data__for_each_file(i, d) {
1125                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1126                 if (IS_ERR(d->session)) {
1127                         ret = PTR_ERR(d->session);
1128                         pr_err("Failed to open %s\n", d->data.path);
1129                         goto out_delete;
1130                 }
1131
1132                 if (pdiff.time_str) {
1133                         ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1134                         if (ret < 0)
1135                                 goto out_delete;
1136                 }
1137
1138                 if (cpu_list) {
1139                         ret = perf_session__cpu_bitmap(d->session, cpu_list,
1140                                                        cpu_bitmap);
1141                         if (ret < 0)
1142                                 goto out_delete;
1143                 }
1144
1145                 ret = perf_session__process_events(d->session);
1146                 if (ret) {
1147                         pr_err("Failed to process %s\n", d->data.path);
1148                         goto out_delete;
1149                 }
1150
1151                 perf_evlist__collapse_resort(d->session->evlist);
1152
1153                 if (pdiff.ptime_range)
1154                         zfree(&pdiff.ptime_range);
1155         }
1156
1157         data_process();
1158
1159  out_delete:
1160         data__for_each_file(i, d) {
1161                 perf_session__delete(d->session);
1162                 data__free(d);
1163         }
1164
1165         free(data__files);
1166
1167         if (pdiff.ptime_range)
1168                 zfree(&pdiff.ptime_range);
1169
1170         if (abstime_ostr)
1171                 free(abstime_ostr);
1172
1173         return ret;
1174 }
1175
1176 static const char * const diff_usage[] = {
1177         "perf diff [<options>] [old_file] [new_file]",
1178         NULL,
1179 };
1180
1181 static const struct option options[] = {
1182         OPT_INCR('v', "verbose", &verbose,
1183                     "be more verbose (show symbol address, etc)"),
1184         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
1185         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1186                     "Show only items with match in baseline"),
1187         OPT_CALLBACK('c', "compute", &compute,
1188                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1189                      "Entries differential computation selection",
1190                      setup_compute),
1191         OPT_BOOLEAN('p', "period", &show_period,
1192                     "Show period values."),
1193         OPT_BOOLEAN('F', "formula", &show_formula,
1194                     "Show formula."),
1195         OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1196                     "Show cycles histogram and standard deviation "
1197                     "- WARNING: use only with -c cycles."),
1198         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1199                     "dump raw trace in ASCII"),
1200         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1201         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1202                    "file", "kallsyms pathname"),
1203         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1204                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
1205         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1206                    "only consider symbols in these dsos"),
1207         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1208                    "only consider symbols in these comms"),
1209         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1210                    "only consider these symbols"),
1211         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1212                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1213                    " Please refer the man page for the complete list."),
1214         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1215                    "separator for columns, no spaces will be added between "
1216                    "columns '.' is reserved."),
1217         OPT_CALLBACK(0, "symfs", NULL, "directory",
1218                      "Look for files with symbols relative to this directory",
1219                      symbol__config_symfs),
1220         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1221         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1222                      "How to display percentage of filtered entries", parse_filter_percentage),
1223         OPT_STRING(0, "time", &pdiff.time_str, "str",
1224                    "Time span (time percent or absolute timestamp)"),
1225         OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1226         OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1227                    "only consider symbols in these pids"),
1228         OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1229                    "only consider symbols in these tids"),
1230         OPT_END()
1231 };
1232
1233 static double baseline_percent(struct hist_entry *he)
1234 {
1235         u64 total = hists__total_period(he->hists);
1236
1237         return 100.0 * he->stat.period / total;
1238 }
1239
1240 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1241                                struct perf_hpp *hpp, struct hist_entry *he)
1242 {
1243         struct diff_hpp_fmt *dfmt =
1244                 container_of(fmt, struct diff_hpp_fmt, fmt);
1245         double percent = baseline_percent(he);
1246         char pfmt[20] = " ";
1247
1248         if (!he->dummy) {
1249                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1250                 return percent_color_snprintf(hpp->buf, hpp->size,
1251                                               pfmt, percent);
1252         } else
1253                 return scnprintf(hpp->buf, hpp->size, "%*s",
1254                                  dfmt->header_width, pfmt);
1255 }
1256
1257 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1258 {
1259         double percent = baseline_percent(he);
1260         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1261         int ret = 0;
1262
1263         if (!he->dummy)
1264                 ret = scnprintf(buf, size, fmt, percent);
1265
1266         return ret;
1267 }
1268
1269 static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1270                          struct perf_hpp *hpp, int width)
1271 {
1272         struct block_hist *bh = container_of(he, struct block_hist, he);
1273         struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1274         struct hist_entry *block_he;
1275         struct block_info *bi;
1276         char buf[128];
1277         char *start_line, *end_line;
1278
1279         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1280         if (!block_he) {
1281                 hpp->skip = true;
1282                 return 0;
1283         }
1284
1285         /*
1286          * Avoid printing the warning "addr2line_init failed for ..."
1287          */
1288         symbol_conf.disable_add2line_warn = true;
1289
1290         bi = block_he->block_info;
1291
1292         start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1293                                   he->ms.sym);
1294
1295         end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1296                                 he->ms.sym);
1297
1298         if ((strncmp(start_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0) &&
1299             (strncmp(end_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)) {
1300                 scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1301                           start_line, end_line, block_he->diff.cycles);
1302         } else {
1303                 scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1304                           bi->start, bi->end, block_he->diff.cycles);
1305         }
1306
1307         free_srcline(start_line);
1308         free_srcline(end_line);
1309
1310         return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1311 }
1312
1313 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1314                                 struct perf_hpp *hpp, struct hist_entry *he,
1315                                 int comparison_method)
1316 {
1317         struct diff_hpp_fmt *dfmt =
1318                 container_of(fmt, struct diff_hpp_fmt, fmt);
1319         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1320         double diff;
1321         s64 wdiff;
1322         char pfmt[20] = " ";
1323
1324         if (!pair) {
1325                 if (comparison_method == COMPUTE_CYCLES) {
1326                         struct block_hist *bh;
1327
1328                         bh = container_of(he, struct block_hist, he);
1329                         if (bh->block_idx)
1330                                 hpp->skip = true;
1331                 }
1332
1333                 goto no_print;
1334         }
1335
1336         switch (comparison_method) {
1337         case COMPUTE_DELTA:
1338                 if (pair->diff.computed)
1339                         diff = pair->diff.period_ratio_delta;
1340                 else
1341                         diff = compute_delta(he, pair);
1342
1343                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1344                 return percent_color_snprintf(hpp->buf, hpp->size,
1345                                         pfmt, diff);
1346         case COMPUTE_RATIO:
1347                 if (he->dummy)
1348                         goto dummy_print;
1349                 if (pair->diff.computed)
1350                         diff = pair->diff.period_ratio;
1351                 else
1352                         diff = compute_ratio(he, pair);
1353
1354                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1355                 return value_color_snprintf(hpp->buf, hpp->size,
1356                                         pfmt, diff);
1357         case COMPUTE_WEIGHTED_DIFF:
1358                 if (he->dummy)
1359                         goto dummy_print;
1360                 if (pair->diff.computed)
1361                         wdiff = pair->diff.wdiff;
1362                 else
1363                         wdiff = compute_wdiff(he, pair);
1364
1365                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1366                 return color_snprintf(hpp->buf, hpp->size,
1367                                 get_percent_color(wdiff),
1368                                 pfmt, wdiff);
1369         case COMPUTE_CYCLES:
1370                 return cycles_printf(he, pair, hpp, dfmt->header_width);
1371         default:
1372                 BUG_ON(1);
1373         }
1374 dummy_print:
1375         return scnprintf(hpp->buf, hpp->size, "%*s",
1376                         dfmt->header_width, "N/A");
1377 no_print:
1378         return scnprintf(hpp->buf, hpp->size, "%*s",
1379                         dfmt->header_width, pfmt);
1380 }
1381
1382 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1383                         struct perf_hpp *hpp, struct hist_entry *he)
1384 {
1385         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1386 }
1387
1388 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1389                         struct perf_hpp *hpp, struct hist_entry *he)
1390 {
1391         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1392 }
1393
1394 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1395                         struct perf_hpp *hpp, struct hist_entry *he)
1396 {
1397         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1398 }
1399
1400 static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1401                              struct perf_hpp *hpp, struct hist_entry *he)
1402 {
1403         return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1404 }
1405
1406 static int all_zero(unsigned long *vals, int len)
1407 {
1408         int i;
1409
1410         for (i = 0; i < len; i++)
1411                 if (vals[i] != 0)
1412                         return 0;
1413         return 1;
1414 }
1415
1416 static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1417 {
1418         int printed;
1419
1420         if (n <= 1)
1421                 return 0;
1422
1423         if (n > NUM_SPARKS)
1424                 n = NUM_SPARKS;
1425         if (all_zero(svals, n))
1426                 return 0;
1427
1428         printed = print_spark(bf, size, svals, n);
1429         printed += scnprintf(bf + printed, size - printed, " ");
1430         return printed;
1431 }
1432
1433 static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1434                             struct perf_hpp *hpp, struct hist_entry *he)
1435 {
1436         struct diff_hpp_fmt *dfmt =
1437                 container_of(fmt, struct diff_hpp_fmt, fmt);
1438         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1439         struct block_hist *bh = container_of(he, struct block_hist, he);
1440         struct block_hist *bh_pair;
1441         struct hist_entry *block_he;
1442         char spark[32], buf[128];
1443         double r;
1444         int ret, pad;
1445
1446         if (!pair) {
1447                 if (bh->block_idx)
1448                         hpp->skip = true;
1449
1450                 goto no_print;
1451         }
1452
1453         bh_pair = container_of(pair, struct block_hist, he);
1454
1455         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1456         if (!block_he) {
1457                 hpp->skip = true;
1458                 goto no_print;
1459         }
1460
1461         ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1462                                  block_he->diff.stats.n);
1463
1464         r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1465                              avg_stats(&block_he->diff.stats));
1466
1467         if (ret) {
1468                 /*
1469                  * Padding spaces if number of sparks less than NUM_SPARKS
1470                  * otherwise the output is not aligned.
1471                  */
1472                 pad = NUM_SPARKS - ((ret - 1) / 3);
1473                 scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1474                 ret = scnprintf(hpp->buf, hpp->size, "%*s",
1475                                 dfmt->header_width, buf);
1476
1477                 if (pad) {
1478                         ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1479                                          "%-*s", pad, " ");
1480                 }
1481
1482                 return ret;
1483         }
1484
1485 no_print:
1486         return scnprintf(hpp->buf, hpp->size, "%*s",
1487                         dfmt->header_width, " ");
1488 }
1489
1490 static void
1491 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1492 {
1493         switch (idx) {
1494         case PERF_HPP_DIFF__PERIOD_BASELINE:
1495                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
1496                 break;
1497
1498         default:
1499                 break;
1500         }
1501 }
1502
1503 static void
1504 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1505                 int idx, char *buf, size_t size)
1506 {
1507         double diff;
1508         double ratio;
1509         s64 wdiff;
1510
1511         switch (idx) {
1512         case PERF_HPP_DIFF__DELTA:
1513         case PERF_HPP_DIFF__DELTA_ABS:
1514                 if (pair->diff.computed)
1515                         diff = pair->diff.period_ratio_delta;
1516                 else
1517                         diff = compute_delta(he, pair);
1518
1519                 scnprintf(buf, size, "%+4.2F%%", diff);
1520                 break;
1521
1522         case PERF_HPP_DIFF__RATIO:
1523                 /* No point for ratio number if we are dummy.. */
1524                 if (he->dummy) {
1525                         scnprintf(buf, size, "N/A");
1526                         break;
1527                 }
1528
1529                 if (pair->diff.computed)
1530                         ratio = pair->diff.period_ratio;
1531                 else
1532                         ratio = compute_ratio(he, pair);
1533
1534                 if (ratio > 0.0)
1535                         scnprintf(buf, size, "%14.6F", ratio);
1536                 break;
1537
1538         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1539                 /* No point for wdiff number if we are dummy.. */
1540                 if (he->dummy) {
1541                         scnprintf(buf, size, "N/A");
1542                         break;
1543                 }
1544
1545                 if (pair->diff.computed)
1546                         wdiff = pair->diff.wdiff;
1547                 else
1548                         wdiff = compute_wdiff(he, pair);
1549
1550                 if (wdiff != 0)
1551                         scnprintf(buf, size, "%14ld", wdiff);
1552                 break;
1553
1554         case PERF_HPP_DIFF__FORMULA:
1555                 formula_fprintf(he, pair, buf, size);
1556                 break;
1557
1558         case PERF_HPP_DIFF__PERIOD:
1559                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1560                 break;
1561
1562         default:
1563                 BUG_ON(1);
1564         };
1565 }
1566
1567 static void
1568 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1569                     char *buf, size_t size)
1570 {
1571         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1572         int idx = dfmt->idx;
1573
1574         /* baseline is special */
1575         if (idx == PERF_HPP_DIFF__BASELINE)
1576                 hpp__entry_baseline(he, buf, size);
1577         else {
1578                 if (pair)
1579                         hpp__entry_pair(he, pair, idx, buf, size);
1580                 else
1581                         hpp__entry_unpair(he, idx, buf, size);
1582         }
1583 }
1584
1585 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1586                              struct hist_entry *he)
1587 {
1588         struct diff_hpp_fmt *dfmt =
1589                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1590         char buf[MAX_COL_WIDTH] = " ";
1591
1592         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1593
1594         if (symbol_conf.field_sep)
1595                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1596         else
1597                 return scnprintf(hpp->buf, hpp->size, "%*s",
1598                                  dfmt->header_width, buf);
1599 }
1600
1601 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1602                        struct hists *hists __maybe_unused,
1603                        int line __maybe_unused,
1604                        int *span __maybe_unused)
1605 {
1606         struct diff_hpp_fmt *dfmt =
1607                 container_of(fmt, struct diff_hpp_fmt, fmt);
1608
1609         BUG_ON(!dfmt->header);
1610         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1611 }
1612
1613 static int hpp__width(struct perf_hpp_fmt *fmt,
1614                       struct perf_hpp *hpp __maybe_unused,
1615                       struct hists *hists __maybe_unused)
1616 {
1617         struct diff_hpp_fmt *dfmt =
1618                 container_of(fmt, struct diff_hpp_fmt, fmt);
1619
1620         BUG_ON(dfmt->header_width <= 0);
1621         return dfmt->header_width;
1622 }
1623
1624 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1625 {
1626 #define MAX_HEADER_NAME 100
1627         char buf_indent[MAX_HEADER_NAME];
1628         char buf[MAX_HEADER_NAME];
1629         const char *header = NULL;
1630         int width = 0;
1631
1632         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1633         header = columns[dfmt->idx].name;
1634         width  = columns[dfmt->idx].width;
1635
1636         /* Only our defined HPP fmts should appear here. */
1637         BUG_ON(!header);
1638
1639         if (data__files_cnt > 2)
1640                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1641
1642 #define NAME (data__files_cnt > 2 ? buf : header)
1643         dfmt->header_width = width;
1644         width = (int) strlen(NAME);
1645         if (dfmt->header_width < width)
1646                 dfmt->header_width = width;
1647
1648         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1649                   dfmt->header_width, NAME);
1650
1651         dfmt->header = strdup(buf_indent);
1652 #undef MAX_HEADER_NAME
1653 #undef NAME
1654 }
1655
1656 static void data__hpp_register(struct data__file *d, int idx)
1657 {
1658         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1659         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1660
1661         dfmt->idx = idx;
1662
1663         fmt->header = hpp__header;
1664         fmt->width  = hpp__width;
1665         fmt->entry  = hpp__entry_global;
1666         fmt->cmp    = hist_entry__cmp_nop;
1667         fmt->collapse = hist_entry__cmp_nop;
1668
1669         /* TODO more colors */
1670         switch (idx) {
1671         case PERF_HPP_DIFF__BASELINE:
1672                 fmt->color = hpp__color_baseline;
1673                 fmt->sort  = hist_entry__cmp_baseline;
1674                 break;
1675         case PERF_HPP_DIFF__DELTA:
1676                 fmt->color = hpp__color_delta;
1677                 fmt->sort  = hist_entry__cmp_delta;
1678                 break;
1679         case PERF_HPP_DIFF__RATIO:
1680                 fmt->color = hpp__color_ratio;
1681                 fmt->sort  = hist_entry__cmp_ratio;
1682                 break;
1683         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1684                 fmt->color = hpp__color_wdiff;
1685                 fmt->sort  = hist_entry__cmp_wdiff;
1686                 break;
1687         case PERF_HPP_DIFF__DELTA_ABS:
1688                 fmt->color = hpp__color_delta;
1689                 fmt->sort  = hist_entry__cmp_delta_abs;
1690                 break;
1691         case PERF_HPP_DIFF__CYCLES:
1692                 fmt->color = hpp__color_cycles;
1693                 fmt->sort  = hist_entry__cmp_nop;
1694                 break;
1695         case PERF_HPP_DIFF__CYCLES_HIST:
1696                 fmt->color = hpp__color_cycles_hist;
1697                 fmt->sort  = hist_entry__cmp_nop;
1698                 break;
1699         default:
1700                 fmt->sort  = hist_entry__cmp_nop;
1701                 break;
1702         }
1703
1704         init_header(d, dfmt);
1705         perf_hpp__column_register(fmt);
1706         perf_hpp__register_sort_field(fmt);
1707 }
1708
1709 static int ui_init(void)
1710 {
1711         struct data__file *d;
1712         struct perf_hpp_fmt *fmt;
1713         int i;
1714
1715         data__for_each_file(i, d) {
1716
1717                 /*
1718                  * Baseline or compute realted columns:
1719                  *
1720                  *   PERF_HPP_DIFF__BASELINE
1721                  *   PERF_HPP_DIFF__DELTA
1722                  *   PERF_HPP_DIFF__RATIO
1723                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1724                  *   PERF_HPP_DIFF__CYCLES
1725                  */
1726                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1727                                           PERF_HPP_DIFF__BASELINE);
1728
1729                 if (cycles_hist && i)
1730                         data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1731
1732                 /*
1733                  * And the rest:
1734                  *
1735                  * PERF_HPP_DIFF__FORMULA
1736                  * PERF_HPP_DIFF__PERIOD
1737                  * PERF_HPP_DIFF__PERIOD_BASELINE
1738                  */
1739                 if (show_formula && i)
1740                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1741
1742                 if (show_period)
1743                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1744                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1745         }
1746
1747         if (!sort_compute)
1748                 return 0;
1749
1750         /*
1751          * Prepend an fmt to sort on columns at 'sort_compute' first.
1752          * This fmt is added only to the sort list but not to the
1753          * output fields list.
1754          *
1755          * Note that this column (data) can be compared twice - one
1756          * for this 'sort_compute' fmt and another for the normal
1757          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1758          * will be sorted out by first try or baseline and comparing
1759          * is not a costly operation.
1760          */
1761         fmt = zalloc(sizeof(*fmt));
1762         if (fmt == NULL) {
1763                 pr_err("Memory allocation failed\n");
1764                 return -1;
1765         }
1766
1767         fmt->cmp      = hist_entry__cmp_nop;
1768         fmt->collapse = hist_entry__cmp_nop;
1769
1770         switch (compute) {
1771         case COMPUTE_DELTA:
1772                 fmt->sort = hist_entry__cmp_delta_idx;
1773                 break;
1774         case COMPUTE_RATIO:
1775                 fmt->sort = hist_entry__cmp_ratio_idx;
1776                 break;
1777         case COMPUTE_WEIGHTED_DIFF:
1778                 fmt->sort = hist_entry__cmp_wdiff_idx;
1779                 break;
1780         case COMPUTE_DELTA_ABS:
1781                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1782                 break;
1783         case COMPUTE_CYCLES:
1784                 /*
1785                  * Should set since 'fmt->sort' is called without
1786                  * checking valid during sorting
1787                  */
1788                 fmt->sort = hist_entry__cmp_nop;
1789                 break;
1790         default:
1791                 BUG_ON(1);
1792         }
1793
1794         perf_hpp__prepend_sort_field(fmt);
1795         return 0;
1796 }
1797
1798 static int data_init(int argc, const char **argv)
1799 {
1800         struct data__file *d;
1801         static const char *defaults[] = {
1802                 "perf.data.old",
1803                 "perf.data",
1804         };
1805         bool use_default = true;
1806         int i;
1807
1808         data__files_cnt = 2;
1809
1810         if (argc) {
1811                 if (argc == 1)
1812                         defaults[1] = argv[0];
1813                 else {
1814                         data__files_cnt = argc;
1815                         use_default = false;
1816                 }
1817         } else if (perf_guest) {
1818                 defaults[0] = "perf.data.host";
1819                 defaults[1] = "perf.data.guest";
1820         }
1821
1822         if (sort_compute >= (unsigned int) data__files_cnt) {
1823                 pr_err("Order option out of limit.\n");
1824                 return -EINVAL;
1825         }
1826
1827         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1828         if (!data__files)
1829                 return -ENOMEM;
1830
1831         data__for_each_file(i, d) {
1832                 struct perf_data *data = &d->data;
1833
1834                 data->path  = use_default ? defaults[i] : argv[i];
1835                 data->mode  = PERF_DATA_MODE_READ,
1836                 data->force = force,
1837
1838                 d->idx  = i;
1839         }
1840
1841         return 0;
1842 }
1843
1844 static int diff__config(const char *var, const char *value,
1845                         void *cb __maybe_unused)
1846 {
1847         if (!strcmp(var, "diff.order")) {
1848                 int ret;
1849                 if (perf_config_int(&ret, var, value) < 0)
1850                         return -1;
1851                 sort_compute = ret;
1852                 return 0;
1853         }
1854         if (!strcmp(var, "diff.compute")) {
1855                 if (!strcmp(value, "delta")) {
1856                         compute = COMPUTE_DELTA;
1857                 } else if (!strcmp(value, "delta-abs")) {
1858                         compute = COMPUTE_DELTA_ABS;
1859                 } else if (!strcmp(value, "ratio")) {
1860                         compute = COMPUTE_RATIO;
1861                 } else if (!strcmp(value, "wdiff")) {
1862                         compute = COMPUTE_WEIGHTED_DIFF;
1863                 } else {
1864                         pr_err("Invalid compute method: %s\n", value);
1865                         return -1;
1866                 }
1867         }
1868
1869         return 0;
1870 }
1871
1872 int cmd_diff(int argc, const char **argv)
1873 {
1874         int ret = hists__init();
1875
1876         if (ret < 0)
1877                 return ret;
1878
1879         perf_config(diff__config, NULL);
1880
1881         argc = parse_options(argc, argv, options, diff_usage, 0);
1882
1883         if (quiet)
1884                 perf_quiet_option();
1885
1886         if (cycles_hist && (compute != COMPUTE_CYCLES))
1887                 usage_with_options(diff_usage, options);
1888
1889         symbol__annotation_init();
1890
1891         if (symbol__init(NULL) < 0)
1892                 return -1;
1893
1894         if (data_init(argc, argv) < 0)
1895                 return -1;
1896
1897         if (check_file_brstack() < 0)
1898                 return -1;
1899
1900         if (compute == COMPUTE_CYCLES && !pdiff.has_br_stack)
1901                 return -1;
1902
1903         if (ui_init() < 0)
1904                 return -1;
1905
1906         sort__mode = SORT_MODE__DIFF;
1907
1908         if (setup_sorting(NULL) < 0)
1909                 usage_with_options(diff_usage, options);
1910
1911         setup_pager();
1912
1913         sort__setup_elide(NULL);
1914
1915         return __cmd_diff();
1916 }