1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * builtin-diff.c
   4 *
   5 * Builtin diff command: Analyze two perf.data input files, look up and read
   6 * DSOs and symbol information, sort them and produce a diff.
   7 */
   8#include "builtin.h"
   9
  10#include "util/debug.h"
  11#include "util/event.h"
  12#include "util/hist.h"
  13#include "util/evsel.h"
  14#include "util/evlist.h"
  15#include "util/session.h"
  16#include "util/tool.h"
  17#include "util/sort.h"
  18#include "util/srcline.h"
  19#include "util/symbol.h"
 
  20#include "util/data.h"
  21#include "util/config.h"
  22#include "util/time-utils.h"
  23#include "util/annotate.h"
  24#include "util/map.h"
  25#include "util/spark.h"
  26#include "util/block-info.h"
  27#include "util/stream.h"
  28#include "util/util.h"
  29#include <linux/err.h>
  30#include <linux/zalloc.h>
  31#include <subcmd/pager.h>
  32#include <subcmd/parse-options.h>
  33
  34#include <errno.h>
  35#include <inttypes.h>
  36#include <stdlib.h>
  37#include <math.h>
  38
  39struct perf_diff {
  40	struct perf_tool		 tool;
  41	const char			*time_str;
  42	struct perf_time_interval	*ptime_range;
  43	int				 range_size;
  44	int				 range_num;
  45	bool				 has_br_stack;
  46	bool				 stream;
  47};
  48
  49/* Diff command specific HPP columns. */
  50enum {
  51	PERF_HPP_DIFF__BASELINE,
  52	PERF_HPP_DIFF__PERIOD,
  53	PERF_HPP_DIFF__PERIOD_BASELINE,
  54	PERF_HPP_DIFF__DELTA,
  55	PERF_HPP_DIFF__RATIO,
  56	PERF_HPP_DIFF__WEIGHTED_DIFF,
  57	PERF_HPP_DIFF__FORMULA,
  58	PERF_HPP_DIFF__DELTA_ABS,
  59	PERF_HPP_DIFF__CYCLES,
  60	PERF_HPP_DIFF__CYCLES_HIST,
  61
  62	PERF_HPP_DIFF__MAX_INDEX
  63};
  64
  65struct diff_hpp_fmt {
  66	struct perf_hpp_fmt	 fmt;
  67	int			 idx;
  68	char			*header;
  69	int			 header_width;
  70};
  71
  72struct data__file {
  73	struct perf_session	*session;
  74	struct perf_data	 data;
  75	int			 idx;
  76	struct hists		*hists;
  77	struct evlist_streams	*evlist_streams;
  78	struct diff_hpp_fmt	 fmt[PERF_HPP_DIFF__MAX_INDEX];
  79};
  80
  81static struct data__file *data__files;
  82static int data__files_cnt;
  83
  84#define data__for_each_file_start(i, d, s)	\
  85	for (i = s, d = &data__files[s];	\
  86	     i < data__files_cnt;		\
  87	     i++, d = &data__files[i])
  88
  89#define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  90#define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
  91
  92static bool force;
  93static bool show_period;
  94static bool show_formula;
  95static bool show_baseline_only;
  96static bool cycles_hist;
  97static unsigned int sort_compute = 1;
  98
  99static s64 compute_wdiff_w1;
 100static s64 compute_wdiff_w2;
 101
 102static const char		*cpu_list;
 103static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 104
 105enum {
 106	COMPUTE_DELTA,
 107	COMPUTE_RATIO,
 108	COMPUTE_WEIGHTED_DIFF,
 109	COMPUTE_DELTA_ABS,
 110	COMPUTE_CYCLES,
 111	COMPUTE_MAX,
 112	COMPUTE_STREAM,	/* After COMPUTE_MAX to avoid use current compute arrays */
 113};
 114
 115const char *compute_names[COMPUTE_MAX] = {
 116	[COMPUTE_DELTA] = "delta",
 117	[COMPUTE_DELTA_ABS] = "delta-abs",
 118	[COMPUTE_RATIO] = "ratio",
 119	[COMPUTE_WEIGHTED_DIFF] = "wdiff",
 120	[COMPUTE_CYCLES] = "cycles",
 121};
 122
 123static int compute = COMPUTE_DELTA_ABS;
 124
 125static int compute_2_hpp[COMPUTE_MAX] = {
 126	[COMPUTE_DELTA]		= PERF_HPP_DIFF__DELTA,
 127	[COMPUTE_DELTA_ABS]	= PERF_HPP_DIFF__DELTA_ABS,
 128	[COMPUTE_RATIO]		= PERF_HPP_DIFF__RATIO,
 129	[COMPUTE_WEIGHTED_DIFF]	= PERF_HPP_DIFF__WEIGHTED_DIFF,
 130	[COMPUTE_CYCLES]	= PERF_HPP_DIFF__CYCLES,
 131};
 132
 133#define MAX_COL_WIDTH 70
 134
 135static struct header_column {
 136	const char *name;
 137	int width;
 138} columns[PERF_HPP_DIFF__MAX_INDEX] = {
 139	[PERF_HPP_DIFF__BASELINE] = {
 140		.name  = "Baseline",
 141	},
 142	[PERF_HPP_DIFF__PERIOD] = {
 143		.name  = "Period",
 144		.width = 14,
 145	},
 146	[PERF_HPP_DIFF__PERIOD_BASELINE] = {
 147		.name  = "Base period",
 148		.width = 14,
 149	},
 150	[PERF_HPP_DIFF__DELTA] = {
 151		.name  = "Delta",
 152		.width = 7,
 153	},
 154	[PERF_HPP_DIFF__DELTA_ABS] = {
 155		.name  = "Delta Abs",
 156		.width = 7,
 157	},
 158	[PERF_HPP_DIFF__RATIO] = {
 159		.name  = "Ratio",
 160		.width = 14,
 161	},
 162	[PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 163		.name  = "Weighted diff",
 164		.width = 14,
 165	},
 166	[PERF_HPP_DIFF__FORMULA] = {
 167		.name  = "Formula",
 168		.width = MAX_COL_WIDTH,
 169	},
 170	[PERF_HPP_DIFF__CYCLES] = {
 171		.name  = "[Program Block Range] Cycles Diff",
 172		.width = 70,
 173	},
 174	[PERF_HPP_DIFF__CYCLES_HIST] = {
 175		.name  = "stddev/Hist",
 176		.width = NUM_SPARKS + 9,
 177	}
 178};
 179
 180static int setup_compute_opt_wdiff(char *opt)
 181{
 182	char *w1_str = opt;
 183	char *w2_str;
 184
 185	int ret = -EINVAL;
 186
 187	if (!opt)
 188		goto out;
 189
 190	w2_str = strchr(opt, ',');
 191	if (!w2_str)
 192		goto out;
 193
 194	*w2_str++ = 0x0;
 195	if (!*w2_str)
 196		goto out;
 197
 198	compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 199	compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 200
 201	if (!compute_wdiff_w1 || !compute_wdiff_w2)
 202		goto out;
 203
 204	pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 205		  compute_wdiff_w1, compute_wdiff_w2);
 206
 207	ret = 0;
 208
 209 out:
 210	if (ret)
 211		pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 212
 213	return ret;
 214}
 215
 216static int setup_compute_opt(char *opt)
 217{
 218	if (compute == COMPUTE_WEIGHTED_DIFF)
 219		return setup_compute_opt_wdiff(opt);
 220
 221	if (opt) {
 222		pr_err("Failed: extra option specified '%s'", opt);
 223		return -EINVAL;
 224	}
 225
 226	return 0;
 227}
 228
 229static int setup_compute(const struct option *opt, const char *str,
 230			 int unset __maybe_unused)
 231{
 232	int *cp = (int *) opt->value;
 233	char *cstr = (char *) str;
 234	char buf[50];
 235	unsigned i;
 236	char *option;
 237
 238	if (!str) {
 239		*cp = COMPUTE_DELTA;
 240		return 0;
 241	}
 242
 243	option = strchr(str, ':');
 244	if (option) {
 245		unsigned len = option++ - str;
 246
 247		/*
 248		 * The str data are not writeable, so we need
 249		 * to use another buffer.
 250		 */
 251
 252		/* No option value is longer. */
 253		if (len >= sizeof(buf))
 254			return -EINVAL;
 255
 256		strncpy(buf, str, len);
 257		buf[len] = 0x0;
 258		cstr = buf;
 259	}
 260
 261	for (i = 0; i < COMPUTE_MAX; i++)
 262		if (!strcmp(cstr, compute_names[i])) {
 263			*cp = i;
 264			return setup_compute_opt(option);
 265		}
 266
 267	pr_err("Failed: '%s' is not computation method "
 268	       "(use 'delta','ratio' or 'wdiff')\n", str);
 269	return -EINVAL;
 270}
 271
 272static double period_percent(struct hist_entry *he, u64 period)
 273{
 274	u64 total = hists__total_period(he->hists);
 275
 276	return (period * 100.0) / total;
 277}
 278
 279static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 280{
 281	double old_percent = period_percent(he, he->stat.period);
 282	double new_percent = period_percent(pair, pair->stat.period);
 283
 284	pair->diff.period_ratio_delta = new_percent - old_percent;
 285	pair->diff.computed = true;
 286	return pair->diff.period_ratio_delta;
 287}
 288
 289static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 290{
 291	double old_period = he->stat.period ?: 1;
 292	double new_period = pair->stat.period;
 293
 294	pair->diff.computed = true;
 295	pair->diff.period_ratio = new_period / old_period;
 296	return pair->diff.period_ratio;
 297}
 298
 299static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 300{
 301	u64 old_period = he->stat.period;
 302	u64 new_period = pair->stat.period;
 303
 304	pair->diff.computed = true;
 305	pair->diff.wdiff = new_period * compute_wdiff_w2 -
 306			   old_period * compute_wdiff_w1;
 307
 308	return pair->diff.wdiff;
 309}
 310
 311static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 312			 char *buf, size_t size)
 313{
 314	u64 he_total = he->hists->stats.total_period;
 315	u64 pair_total = pair->hists->stats.total_period;
 316
 317	if (symbol_conf.filter_relative) {
 318		he_total = he->hists->stats.total_non_filtered_period;
 319		pair_total = pair->hists->stats.total_non_filtered_period;
 320	}
 321	return scnprintf(buf, size,
 322			 "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 323			 "(%" PRIu64 " * 100 / %" PRIu64 ")",
 324			 pair->stat.period, pair_total,
 325			 he->stat.period, he_total);
 326}
 327
 328static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 329			 char *buf, size_t size)
 330{
 331	double old_period = he->stat.period;
 332	double new_period = pair->stat.period;
 333
 334	return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 335}
 336
 337static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 338			 char *buf, size_t size)
 339{
 340	u64 old_period = he->stat.period;
 341	u64 new_period = pair->stat.period;
 342
 343	return scnprintf(buf, size,
 344		  "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 345		  new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 346}
 347
 348static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 349			   char *buf, size_t size)
 350{
 351	switch (compute) {
 352	case COMPUTE_DELTA:
 353	case COMPUTE_DELTA_ABS:
 354		return formula_delta(he, pair, buf, size);
 355	case COMPUTE_RATIO:
 356		return formula_ratio(he, pair, buf, size);
 357	case COMPUTE_WEIGHTED_DIFF:
 358		return formula_wdiff(he, pair, buf, size);
 359	default:
 360		BUG_ON(1);
 361	}
 362
 363	return -1;
 364}
 365
 366static void *block_hist_zalloc(size_t size)
 367{
 368	struct block_hist *bh;
 369
 370	bh = zalloc(size + sizeof(*bh));
 371	if (!bh)
 372		return NULL;
 373
 374	return &bh->he;
 375}
 376
 377static void block_hist_free(void *he)
 378{
 379	struct block_hist *bh;
 380
 381	bh = container_of(he, struct block_hist, he);
 382	hists__delete_entries(&bh->block_hists);
 383	free(bh);
 384}
 385
 386struct hist_entry_ops block_hist_ops = {
 387	.new    = block_hist_zalloc,
 388	.free   = block_hist_free,
 389};
 390
 391static int diff__process_sample_event(const struct perf_tool *tool,
 392				      union perf_event *event,
 393				      struct perf_sample *sample,
 394				      struct evsel *evsel,
 395				      struct machine *machine)
 396{
 397	struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
 398	struct addr_location al;
 399	struct hists *hists = evsel__hists(evsel);
 400	struct hist_entry_iter iter = {
 401		.evsel	= evsel,
 402		.sample	= sample,
 403		.ops	= &hist_iter_normal,
 404	};
 405	int ret = -1;
 406
 407	if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
 408					  sample->time)) {
 409		return 0;
 410	}
 411
 412	addr_location__init(&al);
 413	if (machine__resolve(machine, &al, sample) < 0) {
 414		pr_warning("problem processing %d event, skipping it.\n",
 415			   event->header.type);
 416		ret = -1;
 417		goto out;
 418	}
 419
 420	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
 421		ret = 0;
 422		goto out;
 423	}
 424
 425	switch (compute) {
 426	case COMPUTE_CYCLES:
 427		if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
 428					  NULL, NULL, NULL, sample, true)) {
 429			pr_warning("problem incrementing symbol period, "
 430				   "skipping event\n");
 431			goto out;
 432		}
 433
 434		hist__account_cycles(sample->branch_stack, &al, sample,
 435				     false, NULL, evsel);
 436		break;
 437
 438	case COMPUTE_STREAM:
 439		if (hist_entry_iter__add(&iter, &al, PERF_MAX_STACK_DEPTH,
 440					 NULL)) {
 441			pr_debug("problem adding hist entry, skipping event\n");
 442			goto out;
 443		}
 444		break;
 445
 446	default:
 447		if (!hists__add_entry(hists, &al, NULL, NULL, NULL, NULL, sample,
 448				      true)) {
 449			pr_warning("problem incrementing symbol period, "
 450				   "skipping event\n");
 451			goto out;
 452		}
 453	}
 454
 455	/*
 456	 * The total_period is updated here before going to the output
 457	 * tree since normally only the baseline hists will call
 458	 * hists__output_resort() and precompute needs the total
 459	 * period in order to sort entries by percentage delta.
 460	 */
 461	hists->stats.total_period += sample->period;
 462	if (!al.filtered)
 463		hists->stats.total_non_filtered_period += sample->period;
 464	ret = 0;
 465out:
 466	addr_location__exit(&al);
 467	return ret;
 468}
 469
 470static struct perf_diff pdiff;
 
 
 
 
 
 
 
 
 
 
 
 471
 472static struct evsel *evsel_match(struct evsel *evsel, struct evlist *evlist)
 
 473{
 474	struct evsel *e;
 475
 476	evlist__for_each_entry(evlist, e) {
 477		if ((evsel->core.attr.type == e->core.attr.type) &&
 478		    (evsel->core.attr.config == e->core.attr.config))
 479			return e;
 480	}
 481
 482	return NULL;
 483}
 484
 485static void evlist__collapse_resort(struct evlist *evlist)
 486{
 487	struct evsel *evsel;
 488
 489	evlist__for_each_entry(evlist, evsel) {
 490		struct hists *hists = evsel__hists(evsel);
 491
 492		hists__collapse_resort(hists, NULL);
 493	}
 494}
 495
 496static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 497{
 498	struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 499	void *ptr = dfmt - dfmt->idx;
 500	struct data__file *d = container_of(ptr, struct data__file, fmt);
 501
 502	return d;
 503}
 504
 505static struct hist_entry*
 506get_pair_data(struct hist_entry *he, struct data__file *d)
 507{
 508	if (hist_entry__has_pairs(he)) {
 509		struct hist_entry *pair;
 510
 511		list_for_each_entry(pair, &he->pairs.head, pairs.node)
 512			if (pair->hists == d->hists)
 513				return pair;
 514	}
 515
 516	return NULL;
 517}
 518
 519static struct hist_entry*
 520get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 521{
 522	struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 523
 524	return get_pair_data(he, d);
 525}
 526
 527static void hists__baseline_only(struct hists *hists)
 528{
 529	struct rb_root_cached *root;
 530	struct rb_node *next;
 531
 532	if (hists__has(hists, need_collapse))
 533		root = &hists->entries_collapsed;
 534	else
 535		root = hists->entries_in;
 536
 537	next = rb_first_cached(root);
 538	while (next != NULL) {
 539		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 540
 541		next = rb_next(&he->rb_node_in);
 542		if (!hist_entry__next_pair(he)) {
 543			rb_erase_cached(&he->rb_node_in, root);
 544			hist_entry__delete(he);
 545		}
 546	}
 547}
 548
 549static int64_t block_cycles_diff_cmp(struct hist_entry *left,
 550				     struct hist_entry *right)
 551{
 552	bool pairs_left  = hist_entry__has_pairs(left);
 553	bool pairs_right = hist_entry__has_pairs(right);
 554	s64 l, r;
 555
 556	if (!pairs_left && !pairs_right)
 557		return 0;
 558
 559	l = llabs(left->diff.cycles);
 560	r = llabs(right->diff.cycles);
 561	return r - l;
 562}
 563
 564static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
 565			  struct hist_entry *left, struct hist_entry *right)
 566{
 567	return block_cycles_diff_cmp(right, left);
 568}
 569
 570static void init_block_hist(struct block_hist *bh)
 571{
 572	__hists__init(&bh->block_hists, &bh->block_list);
 573	perf_hpp_list__init(&bh->block_list);
 574
 575	INIT_LIST_HEAD(&bh->block_fmt.list);
 576	INIT_LIST_HEAD(&bh->block_fmt.sort_list);
 577	bh->block_fmt.cmp = block_info__cmp;
 578	bh->block_fmt.sort = block_sort;
 579	perf_hpp_list__register_sort_field(&bh->block_list,
 580					   &bh->block_fmt);
 581	bh->valid = true;
 582}
 583
 584static struct hist_entry *get_block_pair(struct hist_entry *he,
 585					 struct hists *hists_pair)
 586{
 587	struct rb_root_cached *root = hists_pair->entries_in;
 588	struct rb_node *next = rb_first_cached(root);
 589	int64_t cmp;
 590
 591	while (next != NULL) {
 592		struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
 593						      rb_node_in);
 594
 595		next = rb_next(&he_pair->rb_node_in);
 596
 597		cmp = __block_info__cmp(he_pair, he);
 598		if (!cmp)
 599			return he_pair;
 600	}
 601
 602	return NULL;
 603}
 604
 605static void init_spark_values(unsigned long *svals, int num)
 606{
 607	for (int i = 0; i < num; i++)
 608		svals[i] = 0;
 609}
 610
 611static void update_spark_value(unsigned long *svals, int num,
 612			       struct stats *stats, u64 val)
 613{
 614	int n = stats->n;
 615
 616	if (n < num)
 617		svals[n] = val;
 618}
 619
 620static void compute_cycles_diff(struct hist_entry *he,
 621				struct hist_entry *pair)
 622{
 623	pair->diff.computed = true;
 624	if (pair->block_info->num && he->block_info->num) {
 625		pair->diff.cycles =
 626			pair->block_info->cycles_aggr / pair->block_info->num_aggr -
 627			he->block_info->cycles_aggr / he->block_info->num_aggr;
 628
 629		if (!cycles_hist)
 630			return;
 631
 632		init_stats(&pair->diff.stats);
 633		init_spark_values(pair->diff.svals, NUM_SPARKS);
 634
 635		for (int i = 0; i < pair->block_info->num; i++) {
 636			u64 val;
 637
 638			if (i >= he->block_info->num || i >= NUM_SPARKS)
 639				break;
 640
 641			val = llabs(pair->block_info->cycles_spark[i] -
 642				     he->block_info->cycles_spark[i]);
 643
 644			update_spark_value(pair->diff.svals, NUM_SPARKS,
 645					   &pair->diff.stats, val);
 646			update_stats(&pair->diff.stats, val);
 647		}
 648	}
 649}
 650
 651static void block_hists_match(struct hists *hists_base,
 652			      struct hists *hists_pair)
 653{
 654	struct rb_root_cached *root = hists_base->entries_in;
 655	struct rb_node *next = rb_first_cached(root);
 656
 657	while (next != NULL) {
 658		struct hist_entry *he = rb_entry(next, struct hist_entry,
 659						 rb_node_in);
 660		struct hist_entry *pair = get_block_pair(he, hists_pair);
 661
 662		next = rb_next(&he->rb_node_in);
 663
 664		if (pair) {
 665			hist_entry__add_pair(pair, he);
 666			compute_cycles_diff(he, pair);
 667		}
 668	}
 669}
 670
 671static void hists__precompute(struct hists *hists)
 672{
 673	struct rb_root_cached *root;
 674	struct rb_node *next;
 675
 676	if (hists__has(hists, need_collapse))
 677		root = &hists->entries_collapsed;
 678	else
 679		root = hists->entries_in;
 680
 681	next = rb_first_cached(root);
 682	while (next != NULL) {
 683		struct block_hist *bh, *pair_bh;
 684		struct hist_entry *he, *pair;
 685		struct data__file *d;
 686		int i;
 687
 688		he   = rb_entry(next, struct hist_entry, rb_node_in);
 689		next = rb_next(&he->rb_node_in);
 690
 691		if (compute == COMPUTE_CYCLES) {
 692			bh = container_of(he, struct block_hist, he);
 693			init_block_hist(bh);
 694			block_info__process_sym(he, bh, NULL, 0, 0);
 695		}
 696
 697		data__for_each_file_new(i, d) {
 698			pair = get_pair_data(he, d);
 699			if (!pair)
 700				continue;
 701
 702			switch (compute) {
 703			case COMPUTE_DELTA:
 704			case COMPUTE_DELTA_ABS:
 705				compute_delta(he, pair);
 706				break;
 707			case COMPUTE_RATIO:
 708				compute_ratio(he, pair);
 709				break;
 710			case COMPUTE_WEIGHTED_DIFF:
 711				compute_wdiff(he, pair);
 712				break;
 713			case COMPUTE_CYCLES:
 714				pair_bh = container_of(pair, struct block_hist,
 715						       he);
 716				init_block_hist(pair_bh);
 717				block_info__process_sym(pair, pair_bh, NULL, 0, 0);
 718
 719				bh = container_of(he, struct block_hist, he);
 720
 721				if (bh->valid && pair_bh->valid) {
 722					block_hists_match(&bh->block_hists,
 723							  &pair_bh->block_hists);
 724					hists__output_resort(&pair_bh->block_hists,
 725							     NULL);
 726				}
 727				break;
 728			default:
 729				BUG_ON(1);
 730			}
 731		}
 732	}
 733}
 734
 735static int64_t cmp_doubles(double l, double r)
 736{
 737	if (l > r)
 738		return -1;
 739	else if (l < r)
 740		return 1;
 741	else
 742		return 0;
 743}
 744
 745static int64_t
 746__hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 747			int c)
 748{
 749	switch (c) {
 750	case COMPUTE_DELTA:
 751	{
 752		double l = left->diff.period_ratio_delta;
 753		double r = right->diff.period_ratio_delta;
 754
 755		return cmp_doubles(l, r);
 756	}
 757	case COMPUTE_DELTA_ABS:
 758	{
 759		double l = fabs(left->diff.period_ratio_delta);
 760		double r = fabs(right->diff.period_ratio_delta);
 761
 762		return cmp_doubles(l, r);
 763	}
 764	case COMPUTE_RATIO:
 765	{
 766		double l = left->diff.period_ratio;
 767		double r = right->diff.period_ratio;
 768
 769		return cmp_doubles(l, r);
 770	}
 771	case COMPUTE_WEIGHTED_DIFF:
 772	{
 773		s64 l = left->diff.wdiff;
 774		s64 r = right->diff.wdiff;
 775
 776		return r - l;
 777	}
 778	default:
 779		BUG_ON(1);
 780	}
 781
 782	return 0;
 783}
 784
 785static int64_t
 786hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 787			int c, int sort_idx)
 788{
 789	bool pairs_left  = hist_entry__has_pairs(left);
 790	bool pairs_right = hist_entry__has_pairs(right);
 791	struct hist_entry *p_right, *p_left;
 792
 793	if (!pairs_left && !pairs_right)
 794		return 0;
 795
 796	if (!pairs_left || !pairs_right)
 797		return pairs_left ? -1 : 1;
 798
 799	p_left  = get_pair_data(left,  &data__files[sort_idx]);
 800	p_right = get_pair_data(right, &data__files[sort_idx]);
 801
 802	if (!p_left && !p_right)
 803		return 0;
 804
 805	if (!p_left || !p_right)
 806		return p_left ? -1 : 1;
 807
 808	/*
 809	 * We have 2 entries of same kind, let's
 810	 * make the data comparison.
 811	 */
 812	return __hist_entry__cmp_compute(p_left, p_right, c);
 813}
 814
 815static int64_t
 816hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 817			    int c, int sort_idx)
 818{
 819	struct hist_entry *p_right, *p_left;
 820
 821	p_left  = get_pair_data(left,  &data__files[sort_idx]);
 822	p_right = get_pair_data(right, &data__files[sort_idx]);
 823
 824	if (!p_left && !p_right)
 825		return 0;
 826
 827	if (!p_left || !p_right)
 828		return p_left ? -1 : 1;
 829
 830	if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 831		/*
 832		 * The delta can be computed without the baseline, but
 833		 * others are not.  Put those entries which have no
 834		 * values below.
 835		 */
 836		if (left->dummy && right->dummy)
 837			return 0;
 838
 839		if (left->dummy || right->dummy)
 840			return left->dummy ? 1 : -1;
 841	}
 842
 843	return __hist_entry__cmp_compute(p_left, p_right, c);
 844}
 845
 846static int64_t
 847hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 848		    struct hist_entry *left __maybe_unused,
 849		    struct hist_entry *right __maybe_unused)
 850{
 851	return 0;
 852}
 853
 854static int64_t
 855hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 856			 struct hist_entry *left, struct hist_entry *right)
 857{
 858	if (left->stat.period == right->stat.period)
 859		return 0;
 860	return left->stat.period > right->stat.period ? 1 : -1;
 861}
 862
 863static int64_t
 864hist_entry__cmp_delta(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, d->idx);
 870}
 871
 872static int64_t
 873hist_entry__cmp_delta_abs(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_DELTA_ABS, d->idx);
 879}
 880
 881static int64_t
 882hist_entry__cmp_ratio(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_RATIO, d->idx);
 888}
 889
 890static int64_t
 891hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 892		      struct hist_entry *left, struct hist_entry *right)
 893{
 894	struct data__file *d = fmt_to_data_file(fmt);
 895
 896	return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 897}
 898
 899static int64_t
 900hist_entry__cmp_delta_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,
 904					   sort_compute);
 905}
 906
 907static int64_t
 908hist_entry__cmp_delta_abs_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_DELTA_ABS,
 912					   sort_compute);
 913}
 914
 915static int64_t
 916hist_entry__cmp_ratio_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_RATIO,
 920					   sort_compute);
 921}
 922
 923static int64_t
 924hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 925			  struct hist_entry *left, struct hist_entry *right)
 926{
 927	return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 928					   sort_compute);
 929}
 930
 931static void hists__process(struct hists *hists)
 932{
 933	if (show_baseline_only)
 934		hists__baseline_only(hists);
 935
 936	hists__precompute(hists);
 937	hists__output_resort(hists, NULL);
 938
 939	if (compute == COMPUTE_CYCLES)
 940		symbol_conf.report_block = true;
 941
 942	hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
 943		       !symbol_conf.use_callchain);
 944}
 945
 946static void data__fprintf(void)
 947{
 948	struct data__file *d;
 949	int i;
 950
 951	fprintf(stdout, "# Data files:\n");
 952
 953	data__for_each_file(i, d)
 954		fprintf(stdout, "#  [%d] %s %s\n",
 955			d->idx, d->data.path,
 956			!d->idx ? "(Baseline)" : "");
 957
 958	fprintf(stdout, "#\n");
 959}
 960
 961static void data_process(void)
 962{
 963	struct evlist *evlist_base = data__files[0].session->evlist;
 964	struct evsel *evsel_base;
 965	bool first = true;
 966
 967	evlist__for_each_entry(evlist_base, evsel_base) {
 968		struct hists *hists_base = evsel__hists(evsel_base);
 969		struct data__file *d;
 970		int i;
 971
 972		data__for_each_file_new(i, d) {
 973			struct evlist *evlist = d->session->evlist;
 974			struct evsel *evsel;
 975			struct hists *hists;
 976
 977			evsel = evsel_match(evsel_base, evlist);
 978			if (!evsel)
 979				continue;
 980
 981			hists = evsel__hists(evsel);
 982			d->hists = hists;
 983
 984			hists__match(hists_base, hists);
 985
 986			if (!show_baseline_only)
 987				hists__link(hists_base, hists);
 988		}
 989
 990		if (!quiet) {
 991			fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 992				evsel__name(evsel_base));
 993		}
 994
 995		first = false;
 996
 997		if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
 998			data__fprintf();
 999
1000		/* Don't sort callchain for perf diff */
1001		evsel__reset_sample_bit(evsel_base, CALLCHAIN);
1002
1003		hists__process(hists_base);
1004	}
1005}
1006
1007static int process_base_stream(struct data__file *data_base,
1008			       struct data__file *data_pair,
1009			       const char *title __maybe_unused)
1010{
1011	struct evlist *evlist_base = data_base->session->evlist;
1012	struct evlist *evlist_pair = data_pair->session->evlist;
1013	struct evsel *evsel_base, *evsel_pair;
1014	struct evsel_streams *es_base, *es_pair;
1015
1016	evlist__for_each_entry(evlist_base, evsel_base) {
1017		evsel_pair = evsel_match(evsel_base, evlist_pair);
1018		if (!evsel_pair)
1019			continue;
1020
1021		es_base = evsel_streams__entry(data_base->evlist_streams,
1022					       evsel_base->core.idx);
1023		if (!es_base)
1024			return -1;
1025
1026		es_pair = evsel_streams__entry(data_pair->evlist_streams,
1027					       evsel_pair->core.idx);
1028		if (!es_pair)
1029			return -1;
1030
1031		evsel_streams__match(es_base, es_pair);
1032		evsel_streams__report(es_base, es_pair);
1033	}
1034
1035	return 0;
1036}
1037
1038static void stream_process(void)
1039{
1040	/*
1041	 * Stream comparison only supports two data files.
1042	 * perf.data.old and perf.data. data__files[0] is perf.data.old,
1043	 * data__files[1] is perf.data.
1044	 */
1045	process_base_stream(&data__files[0], &data__files[1],
1046			    "# Output based on old perf data:\n#\n");
1047}
1048
1049static void data__free(struct data__file *d)
1050{
1051	int col;
1052
1053	if (d->evlist_streams)
1054		evlist_streams__delete(d->evlist_streams);
1055
1056	for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1057		struct diff_hpp_fmt *fmt = &d->fmt[col];
1058
1059		zfree(&fmt->header);
1060	}
1061}
1062
1063static int abstime_str_dup(char **pstr)
1064{
1065	char *str = NULL;
1066
1067	if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1068		str = strdup(pdiff.time_str);
1069		if (!str)
1070			return -ENOMEM;
1071	}
1072
1073	*pstr = str;
1074	return 0;
1075}
1076
1077static int parse_absolute_time(struct data__file *d, char **pstr)
1078{
1079	char *p = *pstr;
1080	int ret;
1081
1082	/*
1083	 * Absolute timestamp for one file has the format: a.b,c.d
1084	 * For multiple files, the format is: a.b,c.d:a.b,c.d
1085	 */
1086	p = strchr(*pstr, ':');
1087	if (p) {
1088		if (p == *pstr) {
1089			pr_err("Invalid time string\n");
1090			return -EINVAL;
1091		}
1092
1093		*p = 0;
1094		p++;
1095		if (*p == 0) {
1096			pr_err("Invalid time string\n");
1097			return -EINVAL;
1098		}
1099	}
1100
1101	ret = perf_time__parse_for_ranges(*pstr, d->session,
1102					  &pdiff.ptime_range,
1103					  &pdiff.range_size,
1104					  &pdiff.range_num);
1105	if (ret < 0)
1106		return ret;
1107
1108	if (!p || *p == 0)
1109		*pstr = NULL;
1110	else
1111		*pstr = p;
1112
1113	return ret;
1114}
1115
1116static int parse_percent_time(struct data__file *d)
1117{
1118	int ret;
1119
1120	ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1121					  &pdiff.ptime_range,
1122					  &pdiff.range_size,
1123					  &pdiff.range_num);
1124	return ret;
1125}
1126
1127static int parse_time_str(struct data__file *d, char *abstime_ostr,
1128			   char **pabstime_tmp)
1129{
1130	int ret = 0;
1131
1132	if (abstime_ostr)
1133		ret = parse_absolute_time(d, pabstime_tmp);
1134	else if (pdiff.time_str)
1135		ret = parse_percent_time(d);
1136
1137	return ret;
1138}
1139
1140static int check_file_brstack(void)
1141{
1142	struct data__file *d;
1143	bool has_br_stack;
1144	int i;
1145
1146	data__for_each_file(i, d) {
1147		d->session = perf_session__new(&d->data, &pdiff.tool);
1148		if (IS_ERR(d->session)) {
1149			pr_err("Failed to open %s\n", d->data.path);
1150			return PTR_ERR(d->session);
1151		}
1152
1153		has_br_stack = perf_header__has_feat(&d->session->header,
1154						     HEADER_BRANCH_STACK);
1155		perf_session__delete(d->session);
1156		if (!has_br_stack)
1157			return 0;
1158	}
1159
1160	/* Set only all files having branch stacks */
1161	pdiff.has_br_stack = true;
1162	return 0;
1163}
1164
1165static int __cmd_diff(void)
1166{
1167	struct data__file *d;
1168	int ret, i;
1169	char *abstime_ostr, *abstime_tmp;
1170
1171	ret = abstime_str_dup(&abstime_ostr);
1172	if (ret)
1173		return ret;
1174
1175	abstime_tmp = abstime_ostr;
1176	ret = -EINVAL;
1177
1178	data__for_each_file(i, d) {
1179		d->session = perf_session__new(&d->data, &pdiff.tool);
1180		if (IS_ERR(d->session)) {
1181			ret = PTR_ERR(d->session);
1182			pr_err("Failed to open %s\n", d->data.path);
1183			goto out_delete;
1184		}
1185
1186		if (pdiff.time_str) {
1187			ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1188			if (ret < 0)
1189				goto out_delete;
1190		}
1191
1192		if (cpu_list) {
1193			ret = perf_session__cpu_bitmap(d->session, cpu_list,
1194						       cpu_bitmap);
1195			if (ret < 0)
1196				goto out_delete;
1197		}
1198
1199		ret = perf_session__process_events(d->session);
1200		if (ret) {
1201			pr_err("Failed to process %s\n", d->data.path);
1202			goto out_delete;
1203		}
1204
1205		evlist__collapse_resort(d->session->evlist);
1206
1207		if (pdiff.ptime_range)
1208			zfree(&pdiff.ptime_range);
1209
1210		if (compute == COMPUTE_STREAM) {
1211			d->evlist_streams = evlist__create_streams(
1212						d->session->evlist, 5);
1213			if (!d->evlist_streams) {
1214				ret = -ENOMEM;
1215				goto out_delete;
1216			}
1217		}
1218	}
1219
1220	if (compute == COMPUTE_STREAM)
1221		stream_process();
1222	else
1223		data_process();
1224
1225 out_delete:
1226	data__for_each_file(i, d) {
1227		if (!IS_ERR(d->session))
1228			perf_session__delete(d->session);
1229		data__free(d);
1230	}
1231
1232	free(data__files);
1233
1234	if (pdiff.ptime_range)
1235		zfree(&pdiff.ptime_range);
1236
1237	if (abstime_ostr)
1238		free(abstime_ostr);
1239
1240	return ret;
1241}
1242
1243static const char * const diff_usage[] = {
1244	"perf diff [<options>] [old_file] [new_file]",
1245	NULL,
1246};
1247
1248static const struct option options[] = {
1249	OPT_INCR('v', "verbose", &verbose,
1250		    "be more verbose (show symbol address, etc)"),
1251	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any warnings or messages"),
1252	OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1253		    "Show only items with match in baseline"),
1254	OPT_CALLBACK('c', "compute", &compute,
1255		     "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1256		     "Entries differential computation selection",
1257		     setup_compute),
1258	OPT_BOOLEAN('p', "period", &show_period,
1259		    "Show period values."),
1260	OPT_BOOLEAN('F', "formula", &show_formula,
1261		    "Show formula."),
1262	OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1263		    "Show cycles histogram and standard deviation "
1264		    "- WARNING: use only with -c cycles."),
1265	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1266		    "dump raw trace in ASCII"),
1267	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1268	OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1269		   "file", "kallsyms pathname"),
1270	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1271		    "load module symbols - WARNING: use only with -k and LIVE kernel"),
1272	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1273		   "only consider symbols in these dsos"),
1274	OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1275		   "only consider symbols in these comms"),
1276	OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1277		   "only consider these symbols"),
1278	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1279		   "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1280		   " Please refer the man page for the complete list."),
1281	OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1282		   "separator for columns, no spaces will be added between "
1283		   "columns '.' is reserved."),
1284	OPT_CALLBACK(0, "symfs", NULL, "directory",
1285		     "Look for files with symbols relative to this directory",
1286		     symbol__config_symfs),
1287	OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1288	OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1289		     "How to display percentage of filtered entries", parse_filter_percentage),
1290	OPT_STRING(0, "time", &pdiff.time_str, "str",
1291		   "Time span (time percent or absolute timestamp)"),
1292	OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1293	OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1294		   "only consider symbols in these pids"),
1295	OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1296		   "only consider symbols in these tids"),
1297	OPT_BOOLEAN(0, "stream", &pdiff.stream,
1298		    "Enable hot streams comparison."),
1299	OPT_END()
1300};
1301
1302static double baseline_percent(struct hist_entry *he)
1303{
1304	u64 total = hists__total_period(he->hists);
1305
1306	return 100.0 * he->stat.period / total;
1307}
1308
1309static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1310			       struct perf_hpp *hpp, struct hist_entry *he)
1311{
1312	struct diff_hpp_fmt *dfmt =
1313		container_of(fmt, struct diff_hpp_fmt, fmt);
1314	double percent = baseline_percent(he);
1315	char pfmt[20] = " ";
1316
1317	if (!he->dummy) {
1318		scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1319		return percent_color_snprintf(hpp->buf, hpp->size,
1320					      pfmt, percent);
1321	} else
1322		return scnprintf(hpp->buf, hpp->size, "%*s",
1323				 dfmt->header_width, pfmt);
1324}
1325
1326static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1327{
1328	double percent = baseline_percent(he);
1329	const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1330	int ret = 0;
1331
1332	if (!he->dummy)
1333		ret = scnprintf(buf, size, fmt, percent);
1334
1335	return ret;
1336}
1337
1338static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1339			 struct perf_hpp *hpp, int width)
1340{
1341	struct block_hist *bh = container_of(he, struct block_hist, he);
1342	struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1343	struct hist_entry *block_he;
1344	struct block_info *bi;
1345	char buf[128];
1346	char *start_line, *end_line;
1347
1348	block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1349	if (!block_he) {
1350		hpp->skip = true;
1351		return 0;
1352	}
1353
1354	/*
1355	 * Avoid printing the warning "addr2line_init failed for ..."
1356	 */
1357	symbol_conf.disable_add2line_warn = true;
1358
1359	bi = block_he->block_info;
1360
1361	start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1362				  he->ms.sym);
1363
1364	end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1365				he->ms.sym);
1366
1367	if (start_line != SRCLINE_UNKNOWN &&
1368	    end_line != SRCLINE_UNKNOWN) {
1369		scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1370			  start_line, end_line, block_he->diff.cycles);
1371	} else {
1372		scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1373			  bi->start, bi->end, block_he->diff.cycles);
1374	}
1375
1376	zfree_srcline(&start_line);
1377	zfree_srcline(&end_line);
1378
1379	return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1380}
1381
1382static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1383				struct perf_hpp *hpp, struct hist_entry *he,
1384				int comparison_method)
1385{
1386	struct diff_hpp_fmt *dfmt =
1387		container_of(fmt, struct diff_hpp_fmt, fmt);
1388	struct hist_entry *pair = get_pair_fmt(he, dfmt);
1389	double diff;
1390	s64 wdiff;
1391	char pfmt[20] = " ";
1392
1393	if (!pair) {
1394		if (comparison_method == COMPUTE_CYCLES) {
1395			struct block_hist *bh;
1396
1397			bh = container_of(he, struct block_hist, he);
1398			if (bh->block_idx)
1399				hpp->skip = true;
1400		}
1401
1402		goto no_print;
1403	}
1404
1405	switch (comparison_method) {
1406	case COMPUTE_DELTA:
1407		if (pair->diff.computed)
1408			diff = pair->diff.period_ratio_delta;
1409		else
1410			diff = compute_delta(he, pair);
1411
1412		scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1413		return percent_color_snprintf(hpp->buf, hpp->size,
1414					pfmt, diff);
1415	case COMPUTE_RATIO:
1416		if (he->dummy)
1417			goto dummy_print;
1418		if (pair->diff.computed)
1419			diff = pair->diff.period_ratio;
1420		else
1421			diff = compute_ratio(he, pair);
1422
1423		scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1424		return value_color_snprintf(hpp->buf, hpp->size,
1425					pfmt, diff);
1426	case COMPUTE_WEIGHTED_DIFF:
1427		if (he->dummy)
1428			goto dummy_print;
1429		if (pair->diff.computed)
1430			wdiff = pair->diff.wdiff;
1431		else
1432			wdiff = compute_wdiff(he, pair);
1433
1434		scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1435		return color_snprintf(hpp->buf, hpp->size,
1436				get_percent_color(wdiff),
1437				pfmt, wdiff);
1438	case COMPUTE_CYCLES:
1439		return cycles_printf(he, pair, hpp, dfmt->header_width);
1440	default:
1441		BUG_ON(1);
1442	}
1443dummy_print:
1444	return scnprintf(hpp->buf, hpp->size, "%*s",
1445			dfmt->header_width, "N/A");
1446no_print:
1447	return scnprintf(hpp->buf, hpp->size, "%*s",
1448			dfmt->header_width, pfmt);
1449}
1450
1451static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1452			struct perf_hpp *hpp, struct hist_entry *he)
1453{
1454	return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1455}
1456
1457static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1458			struct perf_hpp *hpp, struct hist_entry *he)
1459{
1460	return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1461}
1462
1463static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1464			struct perf_hpp *hpp, struct hist_entry *he)
1465{
1466	return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1467}
1468
1469static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1470			     struct perf_hpp *hpp, struct hist_entry *he)
1471{
1472	return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1473}
1474
1475static int all_zero(unsigned long *vals, int len)
1476{
1477	int i;
1478
1479	for (i = 0; i < len; i++)
1480		if (vals[i] != 0)
1481			return 0;
1482	return 1;
1483}
1484
1485static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1486{
1487	int printed;
1488
1489	if (n <= 1)
1490		return 0;
1491
1492	if (n > NUM_SPARKS)
1493		n = NUM_SPARKS;
1494	if (all_zero(svals, n))
1495		return 0;
1496
1497	printed = print_spark(bf, size, svals, n);
1498	printed += scnprintf(bf + printed, size - printed, " ");
1499	return printed;
1500}
1501
1502static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1503			    struct perf_hpp *hpp, struct hist_entry *he)
1504{
1505	struct diff_hpp_fmt *dfmt =
1506		container_of(fmt, struct diff_hpp_fmt, fmt);
1507	struct hist_entry *pair = get_pair_fmt(he, dfmt);
1508	struct block_hist *bh = container_of(he, struct block_hist, he);
1509	struct block_hist *bh_pair;
1510	struct hist_entry *block_he;
1511	char spark[32], buf[128];
1512	double r;
1513	int ret, pad;
1514
1515	if (!pair) {
1516		if (bh->block_idx)
1517			hpp->skip = true;
1518
1519		goto no_print;
1520	}
1521
1522	bh_pair = container_of(pair, struct block_hist, he);
1523
1524	block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1525	if (!block_he) {
1526		hpp->skip = true;
1527		goto no_print;
1528	}
1529
1530	ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1531				 block_he->diff.stats.n);
1532
1533	r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1534			     avg_stats(&block_he->diff.stats));
1535
1536	if (ret) {
1537		/*
1538		 * Padding spaces if number of sparks less than NUM_SPARKS
1539		 * otherwise the output is not aligned.
1540		 */
1541		pad = NUM_SPARKS - ((ret - 1) / 3);
1542		scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1543		ret = scnprintf(hpp->buf, hpp->size, "%*s",
1544				dfmt->header_width, buf);
1545
1546		if (pad) {
1547			ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1548					 "%-*s", pad, " ");
1549		}
1550
1551		return ret;
1552	}
1553
1554no_print:
1555	return scnprintf(hpp->buf, hpp->size, "%*s",
1556			dfmt->header_width, " ");
1557}
1558
1559static void
1560hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1561{
1562	switch (idx) {
1563	case PERF_HPP_DIFF__PERIOD_BASELINE:
1564		scnprintf(buf, size, "%" PRIu64, he->stat.period);
1565		break;
1566
1567	default:
1568		break;
1569	}
1570}
1571
1572static void
1573hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1574		int idx, char *buf, size_t size)
1575{
1576	double diff;
1577	double ratio;
1578	s64 wdiff;
1579
1580	switch (idx) {
1581	case PERF_HPP_DIFF__DELTA:
1582	case PERF_HPP_DIFF__DELTA_ABS:
1583		if (pair->diff.computed)
1584			diff = pair->diff.period_ratio_delta;
1585		else
1586			diff = compute_delta(he, pair);
1587
1588		scnprintf(buf, size, "%+4.2F%%", diff);
1589		break;
1590
1591	case PERF_HPP_DIFF__RATIO:
1592		/* No point for ratio number if we are dummy.. */
1593		if (he->dummy) {
1594			scnprintf(buf, size, "N/A");
1595			break;
1596		}
1597
1598		if (pair->diff.computed)
1599			ratio = pair->diff.period_ratio;
1600		else
1601			ratio = compute_ratio(he, pair);
1602
1603		if (ratio > 0.0)
1604			scnprintf(buf, size, "%14.6F", ratio);
1605		break;
1606
1607	case PERF_HPP_DIFF__WEIGHTED_DIFF:
1608		/* No point for wdiff number if we are dummy.. */
1609		if (he->dummy) {
1610			scnprintf(buf, size, "N/A");
1611			break;
1612		}
1613
1614		if (pair->diff.computed)
1615			wdiff = pair->diff.wdiff;
1616		else
1617			wdiff = compute_wdiff(he, pair);
1618
1619		if (wdiff != 0)
1620			scnprintf(buf, size, "%14ld", wdiff);
1621		break;
1622
1623	case PERF_HPP_DIFF__FORMULA:
1624		formula_fprintf(he, pair, buf, size);
1625		break;
1626
1627	case PERF_HPP_DIFF__PERIOD:
1628		scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1629		break;
1630
1631	default:
1632		BUG_ON(1);
1633	}
1634}
1635
1636static void
1637__hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1638		    char *buf, size_t size)
1639{
1640	struct hist_entry *pair = get_pair_fmt(he, dfmt);
1641	int idx = dfmt->idx;
1642
1643	/* baseline is special */
1644	if (idx == PERF_HPP_DIFF__BASELINE)
1645		hpp__entry_baseline(he, buf, size);
1646	else {
1647		if (pair)
1648			hpp__entry_pair(he, pair, idx, buf, size);
1649		else
1650			hpp__entry_unpair(he, idx, buf, size);
1651	}
1652}
1653
1654static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1655			     struct hist_entry *he)
1656{
1657	struct diff_hpp_fmt *dfmt =
1658		container_of(_fmt, struct diff_hpp_fmt, fmt);
1659	char buf[MAX_COL_WIDTH] = " ";
1660
1661	__hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1662
1663	if (symbol_conf.field_sep)
1664		return scnprintf(hpp->buf, hpp->size, "%s", buf);
1665	else
1666		return scnprintf(hpp->buf, hpp->size, "%*s",
1667				 dfmt->header_width, buf);
1668}
1669
1670static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1671		       struct hists *hists __maybe_unused,
1672		       int line __maybe_unused,
1673		       int *span __maybe_unused)
1674{
1675	struct diff_hpp_fmt *dfmt =
1676		container_of(fmt, struct diff_hpp_fmt, fmt);
1677
1678	BUG_ON(!dfmt->header);
1679	return scnprintf(hpp->buf, hpp->size, dfmt->header);
1680}
1681
1682static int hpp__width(struct perf_hpp_fmt *fmt,
1683		      struct perf_hpp *hpp __maybe_unused,
1684		      struct hists *hists __maybe_unused)
1685{
1686	struct diff_hpp_fmt *dfmt =
1687		container_of(fmt, struct diff_hpp_fmt, fmt);
1688
1689	BUG_ON(dfmt->header_width <= 0);
1690	return dfmt->header_width;
1691}
1692
1693static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1694{
1695#define MAX_HEADER_NAME 100
1696	char buf_indent[MAX_HEADER_NAME];
1697	char buf[MAX_HEADER_NAME];
1698	const char *header = NULL;
1699	int width = 0;
1700
1701	BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1702	header = columns[dfmt->idx].name;
1703	width  = columns[dfmt->idx].width;
1704
1705	/* Only our defined HPP fmts should appear here. */
1706	BUG_ON(!header);
1707
1708	if (data__files_cnt > 2)
1709		scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1710
1711#define NAME (data__files_cnt > 2 ? buf : header)
1712	dfmt->header_width = width;
1713	width = (int) strlen(NAME);
1714	if (dfmt->header_width < width)
1715		dfmt->header_width = width;
1716
1717	scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1718		  dfmt->header_width, NAME);
1719
1720	dfmt->header = strdup(buf_indent);
1721#undef MAX_HEADER_NAME
1722#undef NAME
1723}
1724
1725static void data__hpp_register(struct data__file *d, int idx)
1726{
1727	struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1728	struct perf_hpp_fmt *fmt = &dfmt->fmt;
1729
1730	dfmt->idx = idx;
1731
1732	fmt->header = hpp__header;
1733	fmt->width  = hpp__width;
1734	fmt->entry  = hpp__entry_global;
1735	fmt->cmp    = hist_entry__cmp_nop;
1736	fmt->collapse = hist_entry__cmp_nop;
1737
1738	/* TODO more colors */
1739	switch (idx) {
1740	case PERF_HPP_DIFF__BASELINE:
1741		fmt->color = hpp__color_baseline;
1742		fmt->sort  = hist_entry__cmp_baseline;
1743		break;
1744	case PERF_HPP_DIFF__DELTA:
1745		fmt->color = hpp__color_delta;
1746		fmt->sort  = hist_entry__cmp_delta;
1747		break;
1748	case PERF_HPP_DIFF__RATIO:
1749		fmt->color = hpp__color_ratio;
1750		fmt->sort  = hist_entry__cmp_ratio;
1751		break;
1752	case PERF_HPP_DIFF__WEIGHTED_DIFF:
1753		fmt->color = hpp__color_wdiff;
1754		fmt->sort  = hist_entry__cmp_wdiff;
1755		break;
1756	case PERF_HPP_DIFF__DELTA_ABS:
1757		fmt->color = hpp__color_delta;
1758		fmt->sort  = hist_entry__cmp_delta_abs;
1759		break;
1760	case PERF_HPP_DIFF__CYCLES:
1761		fmt->color = hpp__color_cycles;
1762		fmt->sort  = hist_entry__cmp_nop;
1763		break;
1764	case PERF_HPP_DIFF__CYCLES_HIST:
1765		fmt->color = hpp__color_cycles_hist;
1766		fmt->sort  = hist_entry__cmp_nop;
1767		break;
1768	default:
1769		fmt->sort  = hist_entry__cmp_nop;
1770		break;
1771	}
1772
1773	init_header(d, dfmt);
1774	perf_hpp__column_register(fmt);
1775	perf_hpp__register_sort_field(fmt);
1776}
1777
1778static int ui_init(void)
1779{
1780	struct data__file *d;
1781	struct perf_hpp_fmt *fmt;
1782	int i;
1783
1784	data__for_each_file(i, d) {
1785
1786		/*
1787		 * Baseline or compute related columns:
1788		 *
1789		 *   PERF_HPP_DIFF__BASELINE
1790		 *   PERF_HPP_DIFF__DELTA
1791		 *   PERF_HPP_DIFF__RATIO
1792		 *   PERF_HPP_DIFF__WEIGHTED_DIFF
1793		 *   PERF_HPP_DIFF__CYCLES
1794		 */
1795		data__hpp_register(d, i ? compute_2_hpp[compute] :
1796					  PERF_HPP_DIFF__BASELINE);
1797
1798		if (cycles_hist && i)
1799			data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1800
1801		/*
1802		 * And the rest:
1803		 *
1804		 * PERF_HPP_DIFF__FORMULA
1805		 * PERF_HPP_DIFF__PERIOD
1806		 * PERF_HPP_DIFF__PERIOD_BASELINE
1807		 */
1808		if (show_formula && i)
1809			data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1810
1811		if (show_period)
1812			data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1813						  PERF_HPP_DIFF__PERIOD_BASELINE);
1814	}
1815
1816	if (!sort_compute)
1817		return 0;
1818
1819	/*
1820	 * Prepend an fmt to sort on columns at 'sort_compute' first.
1821	 * This fmt is added only to the sort list but not to the
1822	 * output fields list.
1823	 *
1824	 * Note that this column (data) can be compared twice - one
1825	 * for this 'sort_compute' fmt and another for the normal
1826	 * diff_hpp_fmt.  But it shouldn't a problem as most entries
1827	 * will be sorted out by first try or baseline and comparing
1828	 * is not a costly operation.
1829	 */
1830	fmt = zalloc(sizeof(*fmt));
1831	if (fmt == NULL) {
1832		pr_err("Memory allocation failed\n");
1833		return -1;
1834	}
1835
1836	fmt->cmp      = hist_entry__cmp_nop;
1837	fmt->collapse = hist_entry__cmp_nop;
1838
1839	switch (compute) {
1840	case COMPUTE_DELTA:
1841		fmt->sort = hist_entry__cmp_delta_idx;
1842		break;
1843	case COMPUTE_RATIO:
1844		fmt->sort = hist_entry__cmp_ratio_idx;
1845		break;
1846	case COMPUTE_WEIGHTED_DIFF:
1847		fmt->sort = hist_entry__cmp_wdiff_idx;
1848		break;
1849	case COMPUTE_DELTA_ABS:
1850		fmt->sort = hist_entry__cmp_delta_abs_idx;
1851		break;
1852	case COMPUTE_CYCLES:
1853		/*
1854		 * Should set since 'fmt->sort' is called without
1855		 * checking valid during sorting
1856		 */
1857		fmt->sort = hist_entry__cmp_nop;
1858		break;
1859	default:
1860		BUG_ON(1);
1861	}
1862
1863	perf_hpp__prepend_sort_field(fmt);
1864	return 0;
1865}
1866
1867static int data_init(int argc, const char **argv)
1868{
1869	struct data__file *d;
1870	static const char *defaults[] = {
1871		"perf.data.old",
1872		"perf.data",
1873	};
1874	bool use_default = true;
1875	int i;
1876
1877	data__files_cnt = 2;
1878
1879	if (argc) {
1880		if (argc == 1)
1881			defaults[1] = argv[0];
1882		else {
1883			data__files_cnt = argc;
1884			use_default = false;
1885		}
1886	} else if (perf_guest) {
1887		defaults[0] = "perf.data.host";
1888		defaults[1] = "perf.data.guest";
1889	}
1890
1891	if (sort_compute >= (unsigned int) data__files_cnt) {
1892		pr_err("Order option out of limit.\n");
1893		return -EINVAL;
1894	}
1895
1896	data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1897	if (!data__files)
1898		return -ENOMEM;
1899
1900	data__for_each_file(i, d) {
1901		struct perf_data *data = &d->data;
1902
1903		data->path  = use_default ? defaults[i] : argv[i];
1904		data->mode  = PERF_DATA_MODE_READ;
1905		data->force = force;
1906
1907		d->idx  = i;
1908	}
1909
1910	return 0;
1911}
1912
1913static int diff__config(const char *var, const char *value,
1914			void *cb __maybe_unused)
1915{
1916	if (!strcmp(var, "diff.order")) {
1917		int ret;
1918		if (perf_config_int(&ret, var, value) < 0)
1919			return -1;
1920		sort_compute = ret;
1921		return 0;
1922	}
1923	if (!strcmp(var, "diff.compute")) {
1924		if (!strcmp(value, "delta")) {
1925			compute = COMPUTE_DELTA;
1926		} else if (!strcmp(value, "delta-abs")) {
1927			compute = COMPUTE_DELTA_ABS;
1928		} else if (!strcmp(value, "ratio")) {
1929			compute = COMPUTE_RATIO;
1930		} else if (!strcmp(value, "wdiff")) {
1931			compute = COMPUTE_WEIGHTED_DIFF;
1932		} else {
1933			pr_err("Invalid compute method: %s\n", value);
1934			return -1;
1935		}
1936	}
1937
1938	return 0;
1939}
1940
1941int cmd_diff(int argc, const char **argv)
1942{
1943	int ret = hists__init();
1944
1945	if (ret < 0)
1946		return ret;
1947
1948	perf_tool__init(&pdiff.tool, /*ordered_events=*/true);
1949	pdiff.tool.sample	= diff__process_sample_event;
1950	pdiff.tool.mmap	= perf_event__process_mmap;
1951	pdiff.tool.mmap2	= perf_event__process_mmap2;
1952	pdiff.tool.comm	= perf_event__process_comm;
1953	pdiff.tool.exit	= perf_event__process_exit;
1954	pdiff.tool.fork	= perf_event__process_fork;
1955	pdiff.tool.lost	= perf_event__process_lost;
1956	pdiff.tool.namespaces = perf_event__process_namespaces;
1957	pdiff.tool.cgroup = perf_event__process_cgroup;
1958	pdiff.tool.ordering_requires_timestamps = true;
1959
1960	perf_config(diff__config, NULL);
1961
1962	argc = parse_options(argc, argv, options, diff_usage, 0);
1963
1964	if (quiet)
1965		perf_quiet_option();
1966
1967	if (cycles_hist && (compute != COMPUTE_CYCLES))
1968		usage_with_options(diff_usage, options);
1969
1970	if (pdiff.stream)
1971		compute = COMPUTE_STREAM;
1972
1973	symbol__annotation_init();
1974
1975	if (symbol__init(NULL) < 0)
1976		return -1;
1977
1978	if (data_init(argc, argv) < 0)
1979		return -1;
1980
1981	if (check_file_brstack() < 0)
1982		return -1;
1983
1984	if ((compute == COMPUTE_CYCLES || compute == COMPUTE_STREAM)
1985	    && !pdiff.has_br_stack) {
1986		return -1;
1987	}
1988
1989	if (compute == COMPUTE_STREAM) {
1990		symbol_conf.show_branchflag_count = true;
1991		symbol_conf.disable_add2line_warn = true;
1992		callchain_param.mode = CHAIN_FLAT;
1993		callchain_param.key = CCKEY_SRCLINE;
1994		callchain_param.branch_callstack = 1;
1995		symbol_conf.use_callchain = true;
1996		callchain_register_param(&callchain_param);
1997		sort_order = "srcline,symbol,dso";
1998	} else {
1999		if (ui_init() < 0)
2000			return -1;
2001
2002		sort__mode = SORT_MODE__DIFF;
2003	}
2004
2005	if (setup_sorting(NULL) < 0)
2006		usage_with_options(diff_usage, options);
2007
2008	setup_pager();
2009
2010	sort__setup_elide(NULL);
2011
2012	return __cmd_diff();
2013}