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Linux/tools/perf/builtin-diff.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * builtin-diff.c
  4  *
  5  * Builtin diff command: Analyze two perf.data input files, look up and read
  6  * DSOs and symbol information, sort them and produce a diff.
  7  */
  8 #include "builtin.h"
  9 #include "perf.h"
 10 
 11 #include "util/debug.h"
 12 #include "util/event.h"
 13 #include "util/hist.h"
 14 #include "util/evsel.h"
 15 #include "util/evlist.h"
 16 #include "util/session.h"
 17 #include "util/tool.h"
 18 #include "util/sort.h"
 19 #include "util/srcline.h"
 20 #include "util/symbol.h"
 21 #include "util/data.h"
 22 #include "util/config.h"
 23 #include "util/time-utils.h"
 24 #include "util/annotate.h"
 25 #include "util/map.h"
 26 #include "util/spark.h"
 27 #include "util/block-info.h"
 28 #include <linux/err.h>
 29 #include <linux/zalloc.h>
 30 #include <subcmd/pager.h>
 31 #include <subcmd/parse-options.h>
 32 
 33 #include <errno.h>
 34 #include <inttypes.h>
 35 #include <stdlib.h>
 36 #include <math.h>
 37 
 38 struct perf_diff {
 39         struct perf_tool                 tool;
 40         const char                      *time_str;
 41         struct perf_time_interval       *ptime_range;
 42         int                              range_size;
 43         int                              range_num;
 44         bool                             has_br_stack;
 45 };
 46 
 47 /* Diff command specific HPP columns. */
 48 enum {
 49         PERF_HPP_DIFF__BASELINE,
 50         PERF_HPP_DIFF__PERIOD,
 51         PERF_HPP_DIFF__PERIOD_BASELINE,
 52         PERF_HPP_DIFF__DELTA,
 53         PERF_HPP_DIFF__RATIO,
 54         PERF_HPP_DIFF__WEIGHTED_DIFF,
 55         PERF_HPP_DIFF__FORMULA,
 56         PERF_HPP_DIFF__DELTA_ABS,
 57         PERF_HPP_DIFF__CYCLES,
 58         PERF_HPP_DIFF__CYCLES_HIST,
 59 
 60         PERF_HPP_DIFF__MAX_INDEX
 61 };
 62 
 63 struct diff_hpp_fmt {
 64         struct perf_hpp_fmt      fmt;
 65         int                      idx;
 66         char                    *header;
 67         int                      header_width;
 68 };
 69 
 70 struct data__file {
 71         struct perf_session     *session;
 72         struct perf_data         data;
 73         int                      idx;
 74         struct hists            *hists;
 75         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
 76 };
 77 
 78 static struct data__file *data__files;
 79 static int data__files_cnt;
 80 
 81 #define data__for_each_file_start(i, d, s)      \
 82         for (i = s, d = &data__files[s];        \
 83              i < data__files_cnt;               \
 84              i++, d = &data__files[i])
 85 
 86 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
 87 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
 88 
 89 static bool force;
 90 static bool show_period;
 91 static bool show_formula;
 92 static bool show_baseline_only;
 93 static bool cycles_hist;
 94 static unsigned int sort_compute = 1;
 95 
 96 static s64 compute_wdiff_w1;
 97 static s64 compute_wdiff_w2;
 98 
 99 static const char               *cpu_list;
100 static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
101 
102 enum {
103         COMPUTE_DELTA,
104         COMPUTE_RATIO,
105         COMPUTE_WEIGHTED_DIFF,
106         COMPUTE_DELTA_ABS,
107         COMPUTE_CYCLES,
108         COMPUTE_MAX,
109 };
110 
111 const char *compute_names[COMPUTE_MAX] = {
112         [COMPUTE_DELTA] = "delta",
113         [COMPUTE_DELTA_ABS] = "delta-abs",
114         [COMPUTE_RATIO] = "ratio",
115         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
116         [COMPUTE_CYCLES] = "cycles",
117 };
118 
119 static int compute = COMPUTE_DELTA_ABS;
120 
121 static int compute_2_hpp[COMPUTE_MAX] = {
122         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
123         [COMPUTE_DELTA_ABS]     = PERF_HPP_DIFF__DELTA_ABS,
124         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
125         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
126         [COMPUTE_CYCLES]        = PERF_HPP_DIFF__CYCLES,
127 };
128 
129 #define MAX_COL_WIDTH 70
130 
131 static struct header_column {
132         const char *name;
133         int width;
134 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
135         [PERF_HPP_DIFF__BASELINE] = {
136                 .name  = "Baseline",
137         },
138         [PERF_HPP_DIFF__PERIOD] = {
139                 .name  = "Period",
140                 .width = 14,
141         },
142         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
143                 .name  = "Base period",
144                 .width = 14,
145         },
146         [PERF_HPP_DIFF__DELTA] = {
147                 .name  = "Delta",
148                 .width = 7,
149         },
150         [PERF_HPP_DIFF__DELTA_ABS] = {
151                 .name  = "Delta Abs",
152                 .width = 7,
153         },
154         [PERF_HPP_DIFF__RATIO] = {
155                 .name  = "Ratio",
156                 .width = 14,
157         },
158         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
159                 .name  = "Weighted diff",
160                 .width = 14,
161         },
162         [PERF_HPP_DIFF__FORMULA] = {
163                 .name  = "Formula",
164                 .width = MAX_COL_WIDTH,
165         },
166         [PERF_HPP_DIFF__CYCLES] = {
167                 .name  = "[Program Block Range] Cycles Diff",
168                 .width = 70,
169         },
170         [PERF_HPP_DIFF__CYCLES_HIST] = {
171                 .name  = "stddev/Hist",
172                 .width = NUM_SPARKS + 9,
173         }
174 };
175 
176 static int setup_compute_opt_wdiff(char *opt)
177 {
178         char *w1_str = opt;
179         char *w2_str;
180 
181         int ret = -EINVAL;
182 
183         if (!opt)
184                 goto out;
185 
186         w2_str = strchr(opt, ',');
187         if (!w2_str)
188                 goto out;
189 
190         *w2_str++ = 0x0;
191         if (!*w2_str)
192                 goto out;
193 
194         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
195         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
196 
197         if (!compute_wdiff_w1 || !compute_wdiff_w2)
198                 goto out;
199 
200         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
201                   compute_wdiff_w1, compute_wdiff_w2);
202 
203         ret = 0;
204 
205  out:
206         if (ret)
207                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
208 
209         return ret;
210 }
211 
212 static int setup_compute_opt(char *opt)
213 {
214         if (compute == COMPUTE_WEIGHTED_DIFF)
215                 return setup_compute_opt_wdiff(opt);
216 
217         if (opt) {
218                 pr_err("Failed: extra option specified '%s'", opt);
219                 return -EINVAL;
220         }
221 
222         return 0;
223 }
224 
225 static int setup_compute(const struct option *opt, const char *str,
226                          int unset __maybe_unused)
227 {
228         int *cp = (int *) opt->value;
229         char *cstr = (char *) str;
230         char buf[50];
231         unsigned i;
232         char *option;
233 
234         if (!str) {
235                 *cp = COMPUTE_DELTA;
236                 return 0;
237         }
238 
239         option = strchr(str, ':');
240         if (option) {
241                 unsigned len = option++ - str;
242 
243                 /*
244                  * The str data are not writeable, so we need
245                  * to use another buffer.
246                  */
247 
248                 /* No option value is longer. */
249                 if (len >= sizeof(buf))
250                         return -EINVAL;
251 
252                 strncpy(buf, str, len);
253                 buf[len] = 0x0;
254                 cstr = buf;
255         }
256 
257         for (i = 0; i < COMPUTE_MAX; i++)
258                 if (!strcmp(cstr, compute_names[i])) {
259                         *cp = i;
260                         return setup_compute_opt(option);
261                 }
262 
263         pr_err("Failed: '%s' is not computation method "
264                "(use 'delta','ratio' or 'wdiff')\n", str);
265         return -EINVAL;
266 }
267 
268 static double period_percent(struct hist_entry *he, u64 period)
269 {
270         u64 total = hists__total_period(he->hists);
271 
272         return (period * 100.0) / total;
273 }
274 
275 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
276 {
277         double old_percent = period_percent(he, he->stat.period);
278         double new_percent = period_percent(pair, pair->stat.period);
279 
280         pair->diff.period_ratio_delta = new_percent - old_percent;
281         pair->diff.computed = true;
282         return pair->diff.period_ratio_delta;
283 }
284 
285 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
286 {
287         double old_period = he->stat.period ?: 1;
288         double new_period = pair->stat.period;
289 
290         pair->diff.computed = true;
291         pair->diff.period_ratio = new_period / old_period;
292         return pair->diff.period_ratio;
293 }
294 
295 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
296 {
297         u64 old_period = he->stat.period;
298         u64 new_period = pair->stat.period;
299 
300         pair->diff.computed = true;
301         pair->diff.wdiff = new_period * compute_wdiff_w2 -
302                            old_period * compute_wdiff_w1;
303 
304         return pair->diff.wdiff;
305 }
306 
307 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
308                          char *buf, size_t size)
309 {
310         u64 he_total = he->hists->stats.total_period;
311         u64 pair_total = pair->hists->stats.total_period;
312 
313         if (symbol_conf.filter_relative) {
314                 he_total = he->hists->stats.total_non_filtered_period;
315                 pair_total = pair->hists->stats.total_non_filtered_period;
316         }
317         return scnprintf(buf, size,
318                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
319                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
320                          pair->stat.period, pair_total,
321                          he->stat.period, he_total);
322 }
323 
324 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
325                          char *buf, size_t size)
326 {
327         double old_period = he->stat.period;
328         double new_period = pair->stat.period;
329 
330         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
331 }
332 
333 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
334                          char *buf, size_t size)
335 {
336         u64 old_period = he->stat.period;
337         u64 new_period = pair->stat.period;
338 
339         return scnprintf(buf, size,
340                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
341                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
342 }
343 
344 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
345                            char *buf, size_t size)
346 {
347         switch (compute) {
348         case COMPUTE_DELTA:
349         case COMPUTE_DELTA_ABS:
350                 return formula_delta(he, pair, buf, size);
351         case COMPUTE_RATIO:
352                 return formula_ratio(he, pair, buf, size);
353         case COMPUTE_WEIGHTED_DIFF:
354                 return formula_wdiff(he, pair, buf, size);
355         default:
356                 BUG_ON(1);
357         }
358 
359         return -1;
360 }
361 
362 static void *block_hist_zalloc(size_t size)
363 {
364         struct block_hist *bh;
365 
366         bh = zalloc(size + sizeof(*bh));
367         if (!bh)
368                 return NULL;
369 
370         return &bh->he;
371 }
372 
373 static void block_hist_free(void *he)
374 {
375         struct block_hist *bh;
376 
377         bh = container_of(he, struct block_hist, he);
378         hists__delete_entries(&bh->block_hists);
379         free(bh);
380 }
381 
382 struct hist_entry_ops block_hist_ops = {
383         .new    = block_hist_zalloc,
384         .free   = block_hist_free,
385 };
386 
387 static int diff__process_sample_event(struct perf_tool *tool,
388                                       union perf_event *event,
389                                       struct perf_sample *sample,
390                                       struct evsel *evsel,
391                                       struct machine *machine)
392 {
393         struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
394         struct addr_location al;
395         struct hists *hists = evsel__hists(evsel);
396         int ret = -1;
397 
398         if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
399                                           sample->time)) {
400                 return 0;
401         }
402 
403         if (machine__resolve(machine, &al, sample) < 0) {
404                 pr_warning("problem processing %d event, skipping it.\n",
405                            event->header.type);
406                 return -1;
407         }
408 
409         if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
410                 ret = 0;
411                 goto out_put;
412         }
413 
414         if (compute != COMPUTE_CYCLES) {
415                 if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
416                                       true)) {
417                         pr_warning("problem incrementing symbol period, "
418                                    "skipping event\n");
419                         goto out_put;
420                 }
421         } else {
422                 if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
423                                           NULL, NULL, sample, true)) {
424                         pr_warning("problem incrementing symbol period, "
425                                    "skipping event\n");
426                         goto out_put;
427                 }
428 
429                 hist__account_cycles(sample->branch_stack, &al, sample, false,
430                                      NULL);
431         }
432 
433         /*
434          * The total_period is updated here before going to the output
435          * tree since normally only the baseline hists will call
436          * hists__output_resort() and precompute needs the total
437          * period in order to sort entries by percentage delta.
438          */
439         hists->stats.total_period += sample->period;
440         if (!al.filtered)
441                 hists->stats.total_non_filtered_period += sample->period;
442         ret = 0;
443 out_put:
444         addr_location__put(&al);
445         return ret;
446 }
447 
448 static struct perf_diff pdiff = {
449         .tool = {
450                 .sample = diff__process_sample_event,
451                 .mmap   = perf_event__process_mmap,
452                 .mmap2  = perf_event__process_mmap2,
453                 .comm   = perf_event__process_comm,
454                 .exit   = perf_event__process_exit,
455                 .fork   = perf_event__process_fork,
456                 .lost   = perf_event__process_lost,
457                 .namespaces = perf_event__process_namespaces,
458                 .ordered_events = true,
459                 .ordering_requires_timestamps = true,
460         },
461 };
462 
463 static struct evsel *evsel_match(struct evsel *evsel,
464                                       struct evlist *evlist)
465 {
466         struct evsel *e;
467 
468         evlist__for_each_entry(evlist, e) {
469                 if (perf_evsel__match2(evsel, e))
470                         return e;
471         }
472 
473         return NULL;
474 }
475 
476 static void perf_evlist__collapse_resort(struct evlist *evlist)
477 {
478         struct evsel *evsel;
479 
480         evlist__for_each_entry(evlist, evsel) {
481                 struct hists *hists = evsel__hists(evsel);
482 
483                 hists__collapse_resort(hists, NULL);
484         }
485 }
486 
487 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
488 {
489         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
490         void *ptr = dfmt - dfmt->idx;
491         struct data__file *d = container_of(ptr, struct data__file, fmt);
492 
493         return d;
494 }
495 
496 static struct hist_entry*
497 get_pair_data(struct hist_entry *he, struct data__file *d)
498 {
499         if (hist_entry__has_pairs(he)) {
500                 struct hist_entry *pair;
501 
502                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
503                         if (pair->hists == d->hists)
504                                 return pair;
505         }
506 
507         return NULL;
508 }
509 
510 static struct hist_entry*
511 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
512 {
513         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
514 
515         return get_pair_data(he, d);
516 }
517 
518 static void hists__baseline_only(struct hists *hists)
519 {
520         struct rb_root_cached *root;
521         struct rb_node *next;
522 
523         if (hists__has(hists, need_collapse))
524                 root = &hists->entries_collapsed;
525         else
526                 root = hists->entries_in;
527 
528         next = rb_first_cached(root);
529         while (next != NULL) {
530                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
531 
532                 next = rb_next(&he->rb_node_in);
533                 if (!hist_entry__next_pair(he)) {
534                         rb_erase_cached(&he->rb_node_in, root);
535                         hist_entry__delete(he);
536                 }
537         }
538 }
539 
540 static int64_t block_cycles_diff_cmp(struct hist_entry *left,
541                                      struct hist_entry *right)
542 {
543         bool pairs_left  = hist_entry__has_pairs(left);
544         bool pairs_right = hist_entry__has_pairs(right);
545         s64 l, r;
546 
547         if (!pairs_left && !pairs_right)
548                 return 0;
549 
550         l = llabs(left->diff.cycles);
551         r = llabs(right->diff.cycles);
552         return r - l;
553 }
554 
555 static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
556                           struct hist_entry *left, struct hist_entry *right)
557 {
558         return block_cycles_diff_cmp(right, left);
559 }
560 
561 static void init_block_hist(struct block_hist *bh)
562 {
563         __hists__init(&bh->block_hists, &bh->block_list);
564         perf_hpp_list__init(&bh->block_list);
565 
566         INIT_LIST_HEAD(&bh->block_fmt.list);
567         INIT_LIST_HEAD(&bh->block_fmt.sort_list);
568         bh->block_fmt.cmp = block_info__cmp;
569         bh->block_fmt.sort = block_sort;
570         perf_hpp_list__register_sort_field(&bh->block_list,
571                                            &bh->block_fmt);
572         bh->valid = true;
573 }
574 
575 static int block_pair_cmp(struct hist_entry *a, struct hist_entry *b)
576 {
577         struct block_info *bi_a = a->block_info;
578         struct block_info *bi_b = b->block_info;
579         int cmp;
580 
581         if (!bi_a->sym || !bi_b->sym)
582                 return -1;
583 
584         cmp = strcmp(bi_a->sym->name, bi_b->sym->name);
585 
586         if ((!cmp) && (bi_a->start == bi_b->start) && (bi_a->end == bi_b->end))
587                 return 0;
588 
589         return -1;
590 }
591 
592 static struct hist_entry *get_block_pair(struct hist_entry *he,
593                                          struct hists *hists_pair)
594 {
595         struct rb_root_cached *root = hists_pair->entries_in;
596         struct rb_node *next = rb_first_cached(root);
597         int cmp;
598 
599         while (next != NULL) {
600                 struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
601                                                       rb_node_in);
602 
603                 next = rb_next(&he_pair->rb_node_in);
604 
605                 cmp = block_pair_cmp(he_pair, he);
606                 if (!cmp)
607                         return he_pair;
608         }
609 
610         return NULL;
611 }
612 
613 static void init_spark_values(unsigned long *svals, int num)
614 {
615         for (int i = 0; i < num; i++)
616                 svals[i] = 0;
617 }
618 
619 static void update_spark_value(unsigned long *svals, int num,
620                                struct stats *stats, u64 val)
621 {
622         int n = stats->n;
623 
624         if (n < num)
625                 svals[n] = val;
626 }
627 
628 static void compute_cycles_diff(struct hist_entry *he,
629                                 struct hist_entry *pair)
630 {
631         pair->diff.computed = true;
632         if (pair->block_info->num && he->block_info->num) {
633                 pair->diff.cycles =
634                         pair->block_info->cycles_aggr / pair->block_info->num_aggr -
635                         he->block_info->cycles_aggr / he->block_info->num_aggr;
636 
637                 if (!cycles_hist)
638                         return;
639 
640                 init_stats(&pair->diff.stats);
641                 init_spark_values(pair->diff.svals, NUM_SPARKS);
642 
643                 for (int i = 0; i < pair->block_info->num; i++) {
644                         u64 val;
645 
646                         if (i >= he->block_info->num || i >= NUM_SPARKS)
647                                 break;
648 
649                         val = llabs(pair->block_info->cycles_spark[i] -
650                                      he->block_info->cycles_spark[i]);
651 
652                         update_spark_value(pair->diff.svals, NUM_SPARKS,
653                                            &pair->diff.stats, val);
654                         update_stats(&pair->diff.stats, val);
655                 }
656         }
657 }
658 
659 static void block_hists_match(struct hists *hists_base,
660                               struct hists *hists_pair)
661 {
662         struct rb_root_cached *root = hists_base->entries_in;
663         struct rb_node *next = rb_first_cached(root);
664 
665         while (next != NULL) {
666                 struct hist_entry *he = rb_entry(next, struct hist_entry,
667                                                  rb_node_in);
668                 struct hist_entry *pair = get_block_pair(he, hists_pair);
669 
670                 next = rb_next(&he->rb_node_in);
671 
672                 if (pair) {
673                         hist_entry__add_pair(pair, he);
674                         compute_cycles_diff(he, pair);
675                 }
676         }
677 }
678 
679 static void hists__precompute(struct hists *hists)
680 {
681         struct rb_root_cached *root;
682         struct rb_node *next;
683 
684         if (hists__has(hists, need_collapse))
685                 root = &hists->entries_collapsed;
686         else
687                 root = hists->entries_in;
688 
689         next = rb_first_cached(root);
690         while (next != NULL) {
691                 struct block_hist *bh, *pair_bh;
692                 struct hist_entry *he, *pair;
693                 struct data__file *d;
694                 int i;
695 
696                 he   = rb_entry(next, struct hist_entry, rb_node_in);
697                 next = rb_next(&he->rb_node_in);
698 
699                 if (compute == COMPUTE_CYCLES) {
700                         bh = container_of(he, struct block_hist, he);
701                         init_block_hist(bh);
702                         block_info__process_sym(he, bh, NULL, 0);
703                 }
704 
705                 data__for_each_file_new(i, d) {
706                         pair = get_pair_data(he, d);
707                         if (!pair)
708                                 continue;
709 
710                         switch (compute) {
711                         case COMPUTE_DELTA:
712                         case COMPUTE_DELTA_ABS:
713                                 compute_delta(he, pair);
714                                 break;
715                         case COMPUTE_RATIO:
716                                 compute_ratio(he, pair);
717                                 break;
718                         case COMPUTE_WEIGHTED_DIFF:
719                                 compute_wdiff(he, pair);
720                                 break;
721                         case COMPUTE_CYCLES:
722                                 pair_bh = container_of(pair, struct block_hist,
723                                                        he);
724                                 init_block_hist(pair_bh);
725                                 block_info__process_sym(pair, pair_bh, NULL, 0);
726 
727                                 bh = container_of(he, struct block_hist, he);
728 
729                                 if (bh->valid && pair_bh->valid) {
730                                         block_hists_match(&bh->block_hists,
731                                                           &pair_bh->block_hists);
732                                         hists__output_resort(&pair_bh->block_hists,
733                                                              NULL);
734                                 }
735                                 break;
736                         default:
737                                 BUG_ON(1);
738                         }
739                 }
740         }
741 }
742 
743 static int64_t cmp_doubles(double l, double r)
744 {
745         if (l > r)
746                 return -1;
747         else if (l < r)
748                 return 1;
749         else
750                 return 0;
751 }
752 
753 static int64_t
754 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
755                         int c)
756 {
757         switch (c) {
758         case COMPUTE_DELTA:
759         {
760                 double l = left->diff.period_ratio_delta;
761                 double r = right->diff.period_ratio_delta;
762 
763                 return cmp_doubles(l, r);
764         }
765         case COMPUTE_DELTA_ABS:
766         {
767                 double l = fabs(left->diff.period_ratio_delta);
768                 double r = fabs(right->diff.period_ratio_delta);
769 
770                 return cmp_doubles(l, r);
771         }
772         case COMPUTE_RATIO:
773         {
774                 double l = left->diff.period_ratio;
775                 double r = right->diff.period_ratio;
776 
777                 return cmp_doubles(l, r);
778         }
779         case COMPUTE_WEIGHTED_DIFF:
780         {
781                 s64 l = left->diff.wdiff;
782                 s64 r = right->diff.wdiff;
783 
784                 return r - l;
785         }
786         default:
787                 BUG_ON(1);
788         }
789 
790         return 0;
791 }
792 
793 static int64_t
794 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
795                         int c, int sort_idx)
796 {
797         bool pairs_left  = hist_entry__has_pairs(left);
798         bool pairs_right = hist_entry__has_pairs(right);
799         struct hist_entry *p_right, *p_left;
800 
801         if (!pairs_left && !pairs_right)
802                 return 0;
803 
804         if (!pairs_left || !pairs_right)
805                 return pairs_left ? -1 : 1;
806 
807         p_left  = get_pair_data(left,  &data__files[sort_idx]);
808         p_right = get_pair_data(right, &data__files[sort_idx]);
809 
810         if (!p_left && !p_right)
811                 return 0;
812 
813         if (!p_left || !p_right)
814                 return p_left ? -1 : 1;
815 
816         /*
817          * We have 2 entries of same kind, let's
818          * make the data comparison.
819          */
820         return __hist_entry__cmp_compute(p_left, p_right, c);
821 }
822 
823 static int64_t
824 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
825                             int c, int sort_idx)
826 {
827         struct hist_entry *p_right, *p_left;
828 
829         p_left  = get_pair_data(left,  &data__files[sort_idx]);
830         p_right = get_pair_data(right, &data__files[sort_idx]);
831 
832         if (!p_left && !p_right)
833                 return 0;
834 
835         if (!p_left || !p_right)
836                 return p_left ? -1 : 1;
837 
838         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
839                 /*
840                  * The delta can be computed without the baseline, but
841                  * others are not.  Put those entries which have no
842                  * values below.
843                  */
844                 if (left->dummy && right->dummy)
845                         return 0;
846 
847                 if (left->dummy || right->dummy)
848                         return left->dummy ? 1 : -1;
849         }
850 
851         return __hist_entry__cmp_compute(p_left, p_right, c);
852 }
853 
854 static int64_t
855 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
856                     struct hist_entry *left __maybe_unused,
857                     struct hist_entry *right __maybe_unused)
858 {
859         return 0;
860 }
861 
862 static int64_t
863 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
864                          struct hist_entry *left, struct hist_entry *right)
865 {
866         if (left->stat.period == right->stat.period)
867                 return 0;
868         return left->stat.period > right->stat.period ? 1 : -1;
869 }
870 
871 static int64_t
872 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
873                       struct hist_entry *left, struct hist_entry *right)
874 {
875         struct data__file *d = fmt_to_data_file(fmt);
876 
877         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
878 }
879 
880 static int64_t
881 hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
882                       struct hist_entry *left, struct hist_entry *right)
883 {
884         struct data__file *d = fmt_to_data_file(fmt);
885 
886         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
887 }
888 
889 static int64_t
890 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
891                       struct hist_entry *left, struct hist_entry *right)
892 {
893         struct data__file *d = fmt_to_data_file(fmt);
894 
895         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
896 }
897 
898 static int64_t
899 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
900                       struct hist_entry *left, struct hist_entry *right)
901 {
902         struct data__file *d = fmt_to_data_file(fmt);
903 
904         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
905 }
906 
907 static int64_t
908 hist_entry__cmp_delta_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,
912                                            sort_compute);
913 }
914 
915 static int64_t
916 hist_entry__cmp_delta_abs_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_DELTA_ABS,
920                                            sort_compute);
921 }
922 
923 static int64_t
924 hist_entry__cmp_ratio_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_RATIO,
928                                            sort_compute);
929 }
930 
931 static int64_t
932 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
933                           struct hist_entry *left, struct hist_entry *right)
934 {
935         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
936                                            sort_compute);
937 }
938 
939 static void hists__process(struct hists *hists)
940 {
941         if (show_baseline_only)
942                 hists__baseline_only(hists);
943 
944         hists__precompute(hists);
945         hists__output_resort(hists, NULL);
946 
947         if (compute == COMPUTE_CYCLES)
948                 symbol_conf.report_block = true;
949 
950         hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
951                        !symbol_conf.use_callchain);
952 }
953 
954 static void data__fprintf(void)
955 {
956         struct data__file *d;
957         int i;
958 
959         fprintf(stdout, "# Data files:\n");
960 
961         data__for_each_file(i, d)
962                 fprintf(stdout, "#  [%d] %s %s\n",
963                         d->idx, d->data.path,
964                         !d->idx ? "(Baseline)" : "");
965 
966         fprintf(stdout, "#\n");
967 }
968 
969 static void data_process(void)
970 {
971         struct evlist *evlist_base = data__files[0].session->evlist;
972         struct evsel *evsel_base;
973         bool first = true;
974 
975         evlist__for_each_entry(evlist_base, evsel_base) {
976                 struct hists *hists_base = evsel__hists(evsel_base);
977                 struct data__file *d;
978                 int i;
979 
980                 data__for_each_file_new(i, d) {
981                         struct evlist *evlist = d->session->evlist;
982                         struct evsel *evsel;
983                         struct hists *hists;
984 
985                         evsel = evsel_match(evsel_base, evlist);
986                         if (!evsel)
987                                 continue;
988 
989                         hists = evsel__hists(evsel);
990                         d->hists = hists;
991 
992                         hists__match(hists_base, hists);
993 
994                         if (!show_baseline_only)
995                                 hists__link(hists_base, hists);
996                 }
997 
998                 if (!quiet) {
999                         fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
1000                                 perf_evsel__name(evsel_base));
1001                 }
1002 
1003                 first = false;
1004 
1005                 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
1006                         data__fprintf();
1007 
1008                 /* Don't sort callchain for perf diff */
1009                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
1010 
1011                 hists__process(hists_base);
1012         }
1013 }
1014 
1015 static void data__free(struct data__file *d)
1016 {
1017         int col;
1018 
1019         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1020                 struct diff_hpp_fmt *fmt = &d->fmt[col];
1021 
1022                 zfree(&fmt->header);
1023         }
1024 }
1025 
1026 static int abstime_str_dup(char **pstr)
1027 {
1028         char *str = NULL;
1029 
1030         if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1031                 str = strdup(pdiff.time_str);
1032                 if (!str)
1033                         return -ENOMEM;
1034         }
1035 
1036         *pstr = str;
1037         return 0;
1038 }
1039 
1040 static int parse_absolute_time(struct data__file *d, char **pstr)
1041 {
1042         char *p = *pstr;
1043         int ret;
1044 
1045         /*
1046          * Absolute timestamp for one file has the format: a.b,c.d
1047          * For multiple files, the format is: a.b,c.d:a.b,c.d
1048          */
1049         p = strchr(*pstr, ':');
1050         if (p) {
1051                 if (p == *pstr) {
1052                         pr_err("Invalid time string\n");
1053                         return -EINVAL;
1054                 }
1055 
1056                 *p = 0;
1057                 p++;
1058                 if (*p == 0) {
1059                         pr_err("Invalid time string\n");
1060                         return -EINVAL;
1061                 }
1062         }
1063 
1064         ret = perf_time__parse_for_ranges(*pstr, d->session,
1065                                           &pdiff.ptime_range,
1066                                           &pdiff.range_size,
1067                                           &pdiff.range_num);
1068         if (ret < 0)
1069                 return ret;
1070 
1071         if (!p || *p == 0)
1072                 *pstr = NULL;
1073         else
1074                 *pstr = p;
1075 
1076         return ret;
1077 }
1078 
1079 static int parse_percent_time(struct data__file *d)
1080 {
1081         int ret;
1082 
1083         ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1084                                           &pdiff.ptime_range,
1085                                           &pdiff.range_size,
1086                                           &pdiff.range_num);
1087         return ret;
1088 }
1089 
1090 static int parse_time_str(struct data__file *d, char *abstime_ostr,
1091                            char **pabstime_tmp)
1092 {
1093         int ret = 0;
1094 
1095         if (abstime_ostr)
1096                 ret = parse_absolute_time(d, pabstime_tmp);
1097         else if (pdiff.time_str)
1098                 ret = parse_percent_time(d);
1099 
1100         return ret;
1101 }
1102 
1103 static int check_file_brstack(void)
1104 {
1105         struct data__file *d;
1106         bool has_br_stack;
1107         int i;
1108 
1109         data__for_each_file(i, d) {
1110                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1111                 if (IS_ERR(d->session)) {
1112                         pr_err("Failed to open %s\n", d->data.path);
1113                         return PTR_ERR(d->session);
1114                 }
1115 
1116                 has_br_stack = perf_header__has_feat(&d->session->header,
1117                                                      HEADER_BRANCH_STACK);
1118                 perf_session__delete(d->session);
1119                 if (!has_br_stack)
1120                         return 0;
1121         }
1122 
1123         /* Set only all files having branch stacks */
1124         pdiff.has_br_stack = true;
1125         return 0;
1126 }
1127 
1128 static int __cmd_diff(void)
1129 {
1130         struct data__file *d;
1131         int ret, i;
1132         char *abstime_ostr, *abstime_tmp;
1133 
1134         ret = abstime_str_dup(&abstime_ostr);
1135         if (ret)
1136                 return ret;
1137 
1138         abstime_tmp = abstime_ostr;
1139         ret = -EINVAL;
1140 
1141         data__for_each_file(i, d) {
1142                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1143                 if (IS_ERR(d->session)) {
1144                         ret = PTR_ERR(d->session);
1145                         pr_err("Failed to open %s\n", d->data.path);
1146                         goto out_delete;
1147                 }
1148 
1149                 if (pdiff.time_str) {
1150                         ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1151                         if (ret < 0)
1152                                 goto out_delete;
1153                 }
1154 
1155                 if (cpu_list) {
1156                         ret = perf_session__cpu_bitmap(d->session, cpu_list,
1157                                                        cpu_bitmap);
1158                         if (ret < 0)
1159                                 goto out_delete;
1160                 }
1161 
1162                 ret = perf_session__process_events(d->session);
1163                 if (ret) {
1164                         pr_err("Failed to process %s\n", d->data.path);
1165                         goto out_delete;
1166                 }
1167 
1168                 perf_evlist__collapse_resort(d->session->evlist);
1169 
1170                 if (pdiff.ptime_range)
1171                         zfree(&pdiff.ptime_range);
1172         }
1173 
1174         data_process();
1175 
1176  out_delete:
1177         data__for_each_file(i, d) {
1178                 perf_session__delete(d->session);
1179                 data__free(d);
1180         }
1181 
1182         free(data__files);
1183 
1184         if (pdiff.ptime_range)
1185                 zfree(&pdiff.ptime_range);
1186 
1187         if (abstime_ostr)
1188                 free(abstime_ostr);
1189 
1190         return ret;
1191 }
1192 
1193 static const char * const diff_usage[] = {
1194         "perf diff [<options>] [old_file] [new_file]",
1195         NULL,
1196 };
1197 
1198 static const struct option options[] = {
1199         OPT_INCR('v', "verbose", &verbose,
1200                     "be more verbose (show symbol address, etc)"),
1201         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
1202         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1203                     "Show only items with match in baseline"),
1204         OPT_CALLBACK('c', "compute", &compute,
1205                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1206                      "Entries differential computation selection",
1207                      setup_compute),
1208         OPT_BOOLEAN('p', "period", &show_period,
1209                     "Show period values."),
1210         OPT_BOOLEAN('F', "formula", &show_formula,
1211                     "Show formula."),
1212         OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1213                     "Show cycles histogram and standard deviation "
1214                     "- WARNING: use only with -c cycles."),
1215         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1216                     "dump raw trace in ASCII"),
1217         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1218         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1219                    "file", "kallsyms pathname"),
1220         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1221                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
1222         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1223                    "only consider symbols in these dsos"),
1224         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1225                    "only consider symbols in these comms"),
1226         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1227                    "only consider these symbols"),
1228         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1229                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1230                    " Please refer the man page for the complete list."),
1231         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1232                    "separator for columns, no spaces will be added between "
1233                    "columns '.' is reserved."),
1234         OPT_CALLBACK(0, "symfs", NULL, "directory",
1235                      "Look for files with symbols relative to this directory",
1236                      symbol__config_symfs),
1237         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1238         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1239                      "How to display percentage of filtered entries", parse_filter_percentage),
1240         OPT_STRING(0, "time", &pdiff.time_str, "str",
1241                    "Time span (time percent or absolute timestamp)"),
1242         OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1243         OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1244                    "only consider symbols in these pids"),
1245         OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1246                    "only consider symbols in these tids"),
1247         OPT_END()
1248 };
1249 
1250 static double baseline_percent(struct hist_entry *he)
1251 {
1252         u64 total = hists__total_period(he->hists);
1253 
1254         return 100.0 * he->stat.period / total;
1255 }
1256 
1257 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1258                                struct perf_hpp *hpp, struct hist_entry *he)
1259 {
1260         struct diff_hpp_fmt *dfmt =
1261                 container_of(fmt, struct diff_hpp_fmt, fmt);
1262         double percent = baseline_percent(he);
1263         char pfmt[20] = " ";
1264 
1265         if (!he->dummy) {
1266                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1267                 return percent_color_snprintf(hpp->buf, hpp->size,
1268                                               pfmt, percent);
1269         } else
1270                 return scnprintf(hpp->buf, hpp->size, "%*s",
1271                                  dfmt->header_width, pfmt);
1272 }
1273 
1274 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1275 {
1276         double percent = baseline_percent(he);
1277         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1278         int ret = 0;
1279 
1280         if (!he->dummy)
1281                 ret = scnprintf(buf, size, fmt, percent);
1282 
1283         return ret;
1284 }
1285 
1286 static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1287                          struct perf_hpp *hpp, int width)
1288 {
1289         struct block_hist *bh = container_of(he, struct block_hist, he);
1290         struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1291         struct hist_entry *block_he;
1292         struct block_info *bi;
1293         char buf[128];
1294         char *start_line, *end_line;
1295 
1296         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1297         if (!block_he) {
1298                 hpp->skip = true;
1299                 return 0;
1300         }
1301 
1302         /*
1303          * Avoid printing the warning "addr2line_init failed for ..."
1304          */
1305         symbol_conf.disable_add2line_warn = true;
1306 
1307         bi = block_he->block_info;
1308 
1309         start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1310                                   he->ms.sym);
1311 
1312         end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1313                                 he->ms.sym);
1314 
1315         if ((strncmp(start_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0) &&
1316             (strncmp(end_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)) {
1317                 scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1318                           start_line, end_line, block_he->diff.cycles);
1319         } else {
1320                 scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1321                           bi->start, bi->end, block_he->diff.cycles);
1322         }
1323 
1324         free_srcline(start_line);
1325         free_srcline(end_line);
1326 
1327         return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1328 }
1329 
1330 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1331                                 struct perf_hpp *hpp, struct hist_entry *he,
1332                                 int comparison_method)
1333 {
1334         struct diff_hpp_fmt *dfmt =
1335                 container_of(fmt, struct diff_hpp_fmt, fmt);
1336         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1337         double diff;
1338         s64 wdiff;
1339         char pfmt[20] = " ";
1340 
1341         if (!pair) {
1342                 if (comparison_method == COMPUTE_CYCLES) {
1343                         struct block_hist *bh;
1344 
1345                         bh = container_of(he, struct block_hist, he);
1346                         if (bh->block_idx)
1347                                 hpp->skip = true;
1348                 }
1349 
1350                 goto no_print;
1351         }
1352 
1353         switch (comparison_method) {
1354         case COMPUTE_DELTA:
1355                 if (pair->diff.computed)
1356                         diff = pair->diff.period_ratio_delta;
1357                 else
1358                         diff = compute_delta(he, pair);
1359 
1360                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1361                 return percent_color_snprintf(hpp->buf, hpp->size,
1362                                         pfmt, diff);
1363         case COMPUTE_RATIO:
1364                 if (he->dummy)
1365                         goto dummy_print;
1366                 if (pair->diff.computed)
1367                         diff = pair->diff.period_ratio;
1368                 else
1369                         diff = compute_ratio(he, pair);
1370 
1371                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1372                 return value_color_snprintf(hpp->buf, hpp->size,
1373                                         pfmt, diff);
1374         case COMPUTE_WEIGHTED_DIFF:
1375                 if (he->dummy)
1376                         goto dummy_print;
1377                 if (pair->diff.computed)
1378                         wdiff = pair->diff.wdiff;
1379                 else
1380                         wdiff = compute_wdiff(he, pair);
1381 
1382                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1383                 return color_snprintf(hpp->buf, hpp->size,
1384                                 get_percent_color(wdiff),
1385                                 pfmt, wdiff);
1386         case COMPUTE_CYCLES:
1387                 return cycles_printf(he, pair, hpp, dfmt->header_width);
1388         default:
1389                 BUG_ON(1);
1390         }
1391 dummy_print:
1392         return scnprintf(hpp->buf, hpp->size, "%*s",
1393                         dfmt->header_width, "N/A");
1394 no_print:
1395         return scnprintf(hpp->buf, hpp->size, "%*s",
1396                         dfmt->header_width, pfmt);
1397 }
1398 
1399 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1400                         struct perf_hpp *hpp, struct hist_entry *he)
1401 {
1402         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1403 }
1404 
1405 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1406                         struct perf_hpp *hpp, struct hist_entry *he)
1407 {
1408         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1409 }
1410 
1411 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1412                         struct perf_hpp *hpp, struct hist_entry *he)
1413 {
1414         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1415 }
1416 
1417 static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1418                              struct perf_hpp *hpp, struct hist_entry *he)
1419 {
1420         return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1421 }
1422 
1423 static int all_zero(unsigned long *vals, int len)
1424 {
1425         int i;
1426 
1427         for (i = 0; i < len; i++)
1428                 if (vals[i] != 0)
1429                         return 0;
1430         return 1;
1431 }
1432 
1433 static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1434 {
1435         int printed;
1436 
1437         if (n <= 1)
1438                 return 0;
1439 
1440         if (n > NUM_SPARKS)
1441                 n = NUM_SPARKS;
1442         if (all_zero(svals, n))
1443                 return 0;
1444 
1445         printed = print_spark(bf, size, svals, n);
1446         printed += scnprintf(bf + printed, size - printed, " ");
1447         return printed;
1448 }
1449 
1450 static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1451                             struct perf_hpp *hpp, struct hist_entry *he)
1452 {
1453         struct diff_hpp_fmt *dfmt =
1454                 container_of(fmt, struct diff_hpp_fmt, fmt);
1455         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1456         struct block_hist *bh = container_of(he, struct block_hist, he);
1457         struct block_hist *bh_pair;
1458         struct hist_entry *block_he;
1459         char spark[32], buf[128];
1460         double r;
1461         int ret, pad;
1462 
1463         if (!pair) {
1464                 if (bh->block_idx)
1465                         hpp->skip = true;
1466 
1467                 goto no_print;
1468         }
1469 
1470         bh_pair = container_of(pair, struct block_hist, he);
1471 
1472         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1473         if (!block_he) {
1474                 hpp->skip = true;
1475                 goto no_print;
1476         }
1477 
1478         ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1479                                  block_he->diff.stats.n);
1480 
1481         r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1482                              avg_stats(&block_he->diff.stats));
1483 
1484         if (ret) {
1485                 /*
1486                  * Padding spaces if number of sparks less than NUM_SPARKS
1487                  * otherwise the output is not aligned.
1488                  */
1489                 pad = NUM_SPARKS - ((ret - 1) / 3);
1490                 scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1491                 ret = scnprintf(hpp->buf, hpp->size, "%*s",
1492                                 dfmt->header_width, buf);
1493 
1494                 if (pad) {
1495                         ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1496                                          "%-*s", pad, " ");
1497                 }
1498 
1499                 return ret;
1500         }
1501 
1502 no_print:
1503         return scnprintf(hpp->buf, hpp->size, "%*s",
1504                         dfmt->header_width, " ");
1505 }
1506 
1507 static void
1508 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1509 {
1510         switch (idx) {
1511         case PERF_HPP_DIFF__PERIOD_BASELINE:
1512                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
1513                 break;
1514 
1515         default:
1516                 break;
1517         }
1518 }
1519 
1520 static void
1521 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1522                 int idx, char *buf, size_t size)
1523 {
1524         double diff;
1525         double ratio;
1526         s64 wdiff;
1527 
1528         switch (idx) {
1529         case PERF_HPP_DIFF__DELTA:
1530         case PERF_HPP_DIFF__DELTA_ABS:
1531                 if (pair->diff.computed)
1532                         diff = pair->diff.period_ratio_delta;
1533                 else
1534                         diff = compute_delta(he, pair);
1535 
1536                 scnprintf(buf, size, "%+4.2F%%", diff);
1537                 break;
1538 
1539         case PERF_HPP_DIFF__RATIO:
1540                 /* No point for ratio 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                         ratio = pair->diff.period_ratio;
1548                 else
1549                         ratio = compute_ratio(he, pair);
1550 
1551                 if (ratio > 0.0)
1552                         scnprintf(buf, size, "%14.6F", ratio);
1553                 break;
1554 
1555         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1556                 /* No point for wdiff number if we are dummy.. */
1557                 if (he->dummy) {
1558                         scnprintf(buf, size, "N/A");
1559                         break;
1560                 }
1561 
1562                 if (pair->diff.computed)
1563                         wdiff = pair->diff.wdiff;
1564                 else
1565                         wdiff = compute_wdiff(he, pair);
1566 
1567                 if (wdiff != 0)
1568                         scnprintf(buf, size, "%14ld", wdiff);
1569                 break;
1570 
1571         case PERF_HPP_DIFF__FORMULA:
1572                 formula_fprintf(he, pair, buf, size);
1573                 break;
1574 
1575         case PERF_HPP_DIFF__PERIOD:
1576                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1577                 break;
1578 
1579         default:
1580                 BUG_ON(1);
1581         };
1582 }
1583 
1584 static void
1585 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1586                     char *buf, size_t size)
1587 {
1588         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1589         int idx = dfmt->idx;
1590 
1591         /* baseline is special */
1592         if (idx == PERF_HPP_DIFF__BASELINE)
1593                 hpp__entry_baseline(he, buf, size);
1594         else {
1595                 if (pair)
1596                         hpp__entry_pair(he, pair, idx, buf, size);
1597                 else
1598                         hpp__entry_unpair(he, idx, buf, size);
1599         }
1600 }
1601 
1602 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1603                              struct hist_entry *he)
1604 {
1605         struct diff_hpp_fmt *dfmt =
1606                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1607         char buf[MAX_COL_WIDTH] = " ";
1608 
1609         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1610 
1611         if (symbol_conf.field_sep)
1612                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1613         else
1614                 return scnprintf(hpp->buf, hpp->size, "%*s",
1615                                  dfmt->header_width, buf);
1616 }
1617 
1618 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1619                        struct hists *hists __maybe_unused,
1620                        int line __maybe_unused,
1621                        int *span __maybe_unused)
1622 {
1623         struct diff_hpp_fmt *dfmt =
1624                 container_of(fmt, struct diff_hpp_fmt, fmt);
1625 
1626         BUG_ON(!dfmt->header);
1627         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1628 }
1629 
1630 static int hpp__width(struct perf_hpp_fmt *fmt,
1631                       struct perf_hpp *hpp __maybe_unused,
1632                       struct hists *hists __maybe_unused)
1633 {
1634         struct diff_hpp_fmt *dfmt =
1635                 container_of(fmt, struct diff_hpp_fmt, fmt);
1636 
1637         BUG_ON(dfmt->header_width <= 0);
1638         return dfmt->header_width;
1639 }
1640 
1641 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1642 {
1643 #define MAX_HEADER_NAME 100
1644         char buf_indent[MAX_HEADER_NAME];
1645         char buf[MAX_HEADER_NAME];
1646         const char *header = NULL;
1647         int width = 0;
1648 
1649         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1650         header = columns[dfmt->idx].name;
1651         width  = columns[dfmt->idx].width;
1652 
1653         /* Only our defined HPP fmts should appear here. */
1654         BUG_ON(!header);
1655 
1656         if (data__files_cnt > 2)
1657                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1658 
1659 #define NAME (data__files_cnt > 2 ? buf : header)
1660         dfmt->header_width = width;
1661         width = (int) strlen(NAME);
1662         if (dfmt->header_width < width)
1663                 dfmt->header_width = width;
1664 
1665         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1666                   dfmt->header_width, NAME);
1667 
1668         dfmt->header = strdup(buf_indent);
1669 #undef MAX_HEADER_NAME
1670 #undef NAME
1671 }
1672 
1673 static void data__hpp_register(struct data__file *d, int idx)
1674 {
1675         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1676         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1677 
1678         dfmt->idx = idx;
1679 
1680         fmt->header = hpp__header;
1681         fmt->width  = hpp__width;
1682         fmt->entry  = hpp__entry_global;
1683         fmt->cmp    = hist_entry__cmp_nop;
1684         fmt->collapse = hist_entry__cmp_nop;
1685 
1686         /* TODO more colors */
1687         switch (idx) {
1688         case PERF_HPP_DIFF__BASELINE:
1689                 fmt->color = hpp__color_baseline;
1690                 fmt->sort  = hist_entry__cmp_baseline;
1691                 break;
1692         case PERF_HPP_DIFF__DELTA:
1693                 fmt->color = hpp__color_delta;
1694                 fmt->sort  = hist_entry__cmp_delta;
1695                 break;
1696         case PERF_HPP_DIFF__RATIO:
1697                 fmt->color = hpp__color_ratio;
1698                 fmt->sort  = hist_entry__cmp_ratio;
1699                 break;
1700         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1701                 fmt->color = hpp__color_wdiff;
1702                 fmt->sort  = hist_entry__cmp_wdiff;
1703                 break;
1704         case PERF_HPP_DIFF__DELTA_ABS:
1705                 fmt->color = hpp__color_delta;
1706                 fmt->sort  = hist_entry__cmp_delta_abs;
1707                 break;
1708         case PERF_HPP_DIFF__CYCLES:
1709                 fmt->color = hpp__color_cycles;
1710                 fmt->sort  = hist_entry__cmp_nop;
1711                 break;
1712         case PERF_HPP_DIFF__CYCLES_HIST:
1713                 fmt->color = hpp__color_cycles_hist;
1714                 fmt->sort  = hist_entry__cmp_nop;
1715                 break;
1716         default:
1717                 fmt->sort  = hist_entry__cmp_nop;
1718                 break;
1719         }
1720 
1721         init_header(d, dfmt);
1722         perf_hpp__column_register(fmt);
1723         perf_hpp__register_sort_field(fmt);
1724 }
1725 
1726 static int ui_init(void)
1727 {
1728         struct data__file *d;
1729         struct perf_hpp_fmt *fmt;
1730         int i;
1731 
1732         data__for_each_file(i, d) {
1733 
1734                 /*
1735                  * Baseline or compute realted columns:
1736                  *
1737                  *   PERF_HPP_DIFF__BASELINE
1738                  *   PERF_HPP_DIFF__DELTA
1739                  *   PERF_HPP_DIFF__RATIO
1740                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1741                  *   PERF_HPP_DIFF__CYCLES
1742                  */
1743                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1744                                           PERF_HPP_DIFF__BASELINE);
1745 
1746                 if (cycles_hist && i)
1747                         data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1748 
1749                 /*
1750                  * And the rest:
1751                  *
1752                  * PERF_HPP_DIFF__FORMULA
1753                  * PERF_HPP_DIFF__PERIOD
1754                  * PERF_HPP_DIFF__PERIOD_BASELINE
1755                  */
1756                 if (show_formula && i)
1757                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1758 
1759                 if (show_period)
1760                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1761                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1762         }
1763 
1764         if (!sort_compute)
1765                 return 0;
1766 
1767         /*
1768          * Prepend an fmt to sort on columns at 'sort_compute' first.
1769          * This fmt is added only to the sort list but not to the
1770          * output fields list.
1771          *
1772          * Note that this column (data) can be compared twice - one
1773          * for this 'sort_compute' fmt and another for the normal
1774          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1775          * will be sorted out by first try or baseline and comparing
1776          * is not a costly operation.
1777          */
1778         fmt = zalloc(sizeof(*fmt));
1779         if (fmt == NULL) {
1780                 pr_err("Memory allocation failed\n");
1781                 return -1;
1782         }
1783 
1784         fmt->cmp      = hist_entry__cmp_nop;
1785         fmt->collapse = hist_entry__cmp_nop;
1786 
1787         switch (compute) {
1788         case COMPUTE_DELTA:
1789                 fmt->sort = hist_entry__cmp_delta_idx;
1790                 break;
1791         case COMPUTE_RATIO:
1792                 fmt->sort = hist_entry__cmp_ratio_idx;
1793                 break;
1794         case COMPUTE_WEIGHTED_DIFF:
1795                 fmt->sort = hist_entry__cmp_wdiff_idx;
1796                 break;
1797         case COMPUTE_DELTA_ABS:
1798                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1799                 break;
1800         case COMPUTE_CYCLES:
1801                 /*
1802                  * Should set since 'fmt->sort' is called without
1803                  * checking valid during sorting
1804                  */
1805                 fmt->sort = hist_entry__cmp_nop;
1806                 break;
1807         default:
1808                 BUG_ON(1);
1809         }
1810 
1811         perf_hpp__prepend_sort_field(fmt);
1812         return 0;
1813 }
1814 
1815 static int data_init(int argc, const char **argv)
1816 {
1817         struct data__file *d;
1818         static const char *defaults[] = {
1819                 "perf.data.old",
1820                 "perf.data",
1821         };
1822         bool use_default = true;
1823         int i;
1824 
1825         data__files_cnt = 2;
1826 
1827         if (argc) {
1828                 if (argc == 1)
1829                         defaults[1] = argv[0];
1830                 else {
1831                         data__files_cnt = argc;
1832                         use_default = false;
1833                 }
1834         } else if (perf_guest) {
1835                 defaults[0] = "perf.data.host";
1836                 defaults[1] = "perf.data.guest";
1837         }
1838 
1839         if (sort_compute >= (unsigned int) data__files_cnt) {
1840                 pr_err("Order option out of limit.\n");
1841                 return -EINVAL;
1842         }
1843 
1844         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1845         if (!data__files)
1846                 return -ENOMEM;
1847 
1848         data__for_each_file(i, d) {
1849                 struct perf_data *data = &d->data;
1850 
1851                 data->path  = use_default ? defaults[i] : argv[i];
1852                 data->mode  = PERF_DATA_MODE_READ,
1853                 data->force = force,
1854 
1855                 d->idx  = i;
1856         }
1857 
1858         return 0;
1859 }
1860 
1861 static int diff__config(const char *var, const char *value,
1862                         void *cb __maybe_unused)
1863 {
1864         if (!strcmp(var, "diff.order")) {
1865                 int ret;
1866                 if (perf_config_int(&ret, var, value) < 0)
1867                         return -1;
1868                 sort_compute = ret;
1869                 return 0;
1870         }
1871         if (!strcmp(var, "diff.compute")) {
1872                 if (!strcmp(value, "delta")) {
1873                         compute = COMPUTE_DELTA;
1874                 } else if (!strcmp(value, "delta-abs")) {
1875                         compute = COMPUTE_DELTA_ABS;
1876                 } else if (!strcmp(value, "ratio")) {
1877                         compute = COMPUTE_RATIO;
1878                 } else if (!strcmp(value, "wdiff")) {
1879                         compute = COMPUTE_WEIGHTED_DIFF;
1880                 } else {
1881                         pr_err("Invalid compute method: %s\n", value);
1882                         return -1;
1883                 }
1884         }
1885 
1886         return 0;
1887 }
1888 
1889 int cmd_diff(int argc, const char **argv)
1890 {
1891         int ret = hists__init();
1892 
1893         if (ret < 0)
1894                 return ret;
1895 
1896         perf_config(diff__config, NULL);
1897 
1898         argc = parse_options(argc, argv, options, diff_usage, 0);
1899 
1900         if (quiet)
1901                 perf_quiet_option();
1902 
1903         if (cycles_hist && (compute != COMPUTE_CYCLES))
1904                 usage_with_options(diff_usage, options);
1905 
1906         symbol__annotation_init();
1907 
1908         if (symbol__init(NULL) < 0)
1909                 return -1;
1910 
1911         if (data_init(argc, argv) < 0)
1912                 return -1;
1913 
1914         if (check_file_brstack() < 0)
1915                 return -1;
1916 
1917         if (compute == COMPUTE_CYCLES && !pdiff.has_br_stack)
1918                 return -1;
1919 
1920         if (ui_init() < 0)
1921                 return -1;
1922 
1923         sort__mode = SORT_MODE__DIFF;
1924 
1925         if (setup_sorting(NULL) < 0)
1926                 usage_with_options(diff_usage, options);
1927 
1928         setup_pager();
1929 
1930         sort__setup_elide(NULL);
1931 
1932         return __cmd_diff();
1933 }
1934 

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