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