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1/*
2 * builtin-diff.c
3 *
4 * Builtin diff command: Analyze two perf.data input files, look up and read
5 * DSOs and symbol information, sort them and produce a diff.
6 */
7#include "builtin.h"
8
9#include "util/debug.h"
10#include "util/event.h"
11#include "util/hist.h"
12#include "util/evsel.h"
13#include "util/evlist.h"
14#include "util/session.h"
15#include "util/tool.h"
16#include "util/sort.h"
17#include "util/symbol.h"
18#include "util/util.h"
19#include "util/data.h"
20
21#include <stdlib.h>
22#include <math.h>
23
24/* Diff command specific HPP columns. */
25enum {
26 PERF_HPP_DIFF__BASELINE,
27 PERF_HPP_DIFF__PERIOD,
28 PERF_HPP_DIFF__PERIOD_BASELINE,
29 PERF_HPP_DIFF__DELTA,
30 PERF_HPP_DIFF__RATIO,
31 PERF_HPP_DIFF__WEIGHTED_DIFF,
32 PERF_HPP_DIFF__FORMULA,
33
34 PERF_HPP_DIFF__MAX_INDEX
35};
36
37struct diff_hpp_fmt {
38 struct perf_hpp_fmt fmt;
39 int idx;
40 char *header;
41 int header_width;
42};
43
44struct data__file {
45 struct perf_session *session;
46 struct perf_data_file file;
47 int idx;
48 struct hists *hists;
49 struct diff_hpp_fmt fmt[PERF_HPP_DIFF__MAX_INDEX];
50};
51
52static struct data__file *data__files;
53static int data__files_cnt;
54
55#define data__for_each_file_start(i, d, s) \
56 for (i = s, d = &data__files[s]; \
57 i < data__files_cnt; \
58 i++, d = &data__files[i])
59
60#define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
61#define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
62
63static char diff__default_sort_order[] = "dso,symbol";
64static bool force;
65static bool show_period;
66static bool show_formula;
67static bool show_baseline_only;
68static unsigned int sort_compute;
69
70static s64 compute_wdiff_w1;
71static s64 compute_wdiff_w2;
72
73enum {
74 COMPUTE_DELTA,
75 COMPUTE_RATIO,
76 COMPUTE_WEIGHTED_DIFF,
77 COMPUTE_MAX,
78};
79
80const char *compute_names[COMPUTE_MAX] = {
81 [COMPUTE_DELTA] = "delta",
82 [COMPUTE_RATIO] = "ratio",
83 [COMPUTE_WEIGHTED_DIFF] = "wdiff",
84};
85
86static int compute;
87
88static int compute_2_hpp[COMPUTE_MAX] = {
89 [COMPUTE_DELTA] = PERF_HPP_DIFF__DELTA,
90 [COMPUTE_RATIO] = PERF_HPP_DIFF__RATIO,
91 [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
92};
93
94#define MAX_COL_WIDTH 70
95
96static struct header_column {
97 const char *name;
98 int width;
99} columns[PERF_HPP_DIFF__MAX_INDEX] = {
100 [PERF_HPP_DIFF__BASELINE] = {
101 .name = "Baseline",
102 },
103 [PERF_HPP_DIFF__PERIOD] = {
104 .name = "Period",
105 .width = 14,
106 },
107 [PERF_HPP_DIFF__PERIOD_BASELINE] = {
108 .name = "Base period",
109 .width = 14,
110 },
111 [PERF_HPP_DIFF__DELTA] = {
112 .name = "Delta",
113 .width = 7,
114 },
115 [PERF_HPP_DIFF__RATIO] = {
116 .name = "Ratio",
117 .width = 14,
118 },
119 [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
120 .name = "Weighted diff",
121 .width = 14,
122 },
123 [PERF_HPP_DIFF__FORMULA] = {
124 .name = "Formula",
125 .width = MAX_COL_WIDTH,
126 }
127};
128
129static int setup_compute_opt_wdiff(char *opt)
130{
131 char *w1_str = opt;
132 char *w2_str;
133
134 int ret = -EINVAL;
135
136 if (!opt)
137 goto out;
138
139 w2_str = strchr(opt, ',');
140 if (!w2_str)
141 goto out;
142
143 *w2_str++ = 0x0;
144 if (!*w2_str)
145 goto out;
146
147 compute_wdiff_w1 = strtol(w1_str, NULL, 10);
148 compute_wdiff_w2 = strtol(w2_str, NULL, 10);
149
150 if (!compute_wdiff_w1 || !compute_wdiff_w2)
151 goto out;
152
153 pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
154 compute_wdiff_w1, compute_wdiff_w2);
155
156 ret = 0;
157
158 out:
159 if (ret)
160 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
161
162 return ret;
163}
164
165static int setup_compute_opt(char *opt)
166{
167 if (compute == COMPUTE_WEIGHTED_DIFF)
168 return setup_compute_opt_wdiff(opt);
169
170 if (opt) {
171 pr_err("Failed: extra option specified '%s'", opt);
172 return -EINVAL;
173 }
174
175 return 0;
176}
177
178static int setup_compute(const struct option *opt, const char *str,
179 int unset __maybe_unused)
180{
181 int *cp = (int *) opt->value;
182 char *cstr = (char *) str;
183 char buf[50];
184 unsigned i;
185 char *option;
186
187 if (!str) {
188 *cp = COMPUTE_DELTA;
189 return 0;
190 }
191
192 option = strchr(str, ':');
193 if (option) {
194 unsigned len = option++ - str;
195
196 /*
197 * The str data are not writeable, so we need
198 * to use another buffer.
199 */
200
201 /* No option value is longer. */
202 if (len >= sizeof(buf))
203 return -EINVAL;
204
205 strncpy(buf, str, len);
206 buf[len] = 0x0;
207 cstr = buf;
208 }
209
210 for (i = 0; i < COMPUTE_MAX; i++)
211 if (!strcmp(cstr, compute_names[i])) {
212 *cp = i;
213 return setup_compute_opt(option);
214 }
215
216 pr_err("Failed: '%s' is not computation method "
217 "(use 'delta','ratio' or 'wdiff')\n", str);
218 return -EINVAL;
219}
220
221static double period_percent(struct hist_entry *he, u64 period)
222{
223 u64 total = he->hists->stats.total_period;
224 return (period * 100.0) / total;
225}
226
227static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
228{
229 double old_percent = period_percent(he, he->stat.period);
230 double new_percent = period_percent(pair, pair->stat.period);
231
232 pair->diff.period_ratio_delta = new_percent - old_percent;
233 pair->diff.computed = true;
234 return pair->diff.period_ratio_delta;
235}
236
237static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
238{
239 double old_period = he->stat.period ?: 1;
240 double new_period = pair->stat.period;
241
242 pair->diff.computed = true;
243 pair->diff.period_ratio = new_period / old_period;
244 return pair->diff.period_ratio;
245}
246
247static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
248{
249 u64 old_period = he->stat.period;
250 u64 new_period = pair->stat.period;
251
252 pair->diff.computed = true;
253 pair->diff.wdiff = new_period * compute_wdiff_w2 -
254 old_period * compute_wdiff_w1;
255
256 return pair->diff.wdiff;
257}
258
259static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
260 char *buf, size_t size)
261{
262 return scnprintf(buf, size,
263 "(%" PRIu64 " * 100 / %" PRIu64 ") - "
264 "(%" PRIu64 " * 100 / %" PRIu64 ")",
265 pair->stat.period, pair->hists->stats.total_period,
266 he->stat.period, he->hists->stats.total_period);
267}
268
269static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
270 char *buf, size_t size)
271{
272 double old_period = he->stat.period;
273 double new_period = pair->stat.period;
274
275 return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
276}
277
278static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
279 char *buf, size_t size)
280{
281 u64 old_period = he->stat.period;
282 u64 new_period = pair->stat.period;
283
284 return scnprintf(buf, size,
285 "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
286 new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
287}
288
289static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
290 char *buf, size_t size)
291{
292 switch (compute) {
293 case COMPUTE_DELTA:
294 return formula_delta(he, pair, buf, size);
295 case COMPUTE_RATIO:
296 return formula_ratio(he, pair, buf, size);
297 case COMPUTE_WEIGHTED_DIFF:
298 return formula_wdiff(he, pair, buf, size);
299 default:
300 BUG_ON(1);
301 }
302
303 return -1;
304}
305
306static int hists__add_entry(struct hists *hists,
307 struct addr_location *al, u64 period,
308 u64 weight, u64 transaction)
309{
310 if (__hists__add_entry(hists, al, NULL, NULL, NULL, period, weight,
311 transaction) != NULL)
312 return 0;
313 return -ENOMEM;
314}
315
316static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
317 union perf_event *event,
318 struct perf_sample *sample,
319 struct perf_evsel *evsel,
320 struct machine *machine)
321{
322 struct addr_location al;
323
324 if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
325 pr_warning("problem processing %d event, skipping it.\n",
326 event->header.type);
327 return -1;
328 }
329
330 if (al.filtered)
331 return 0;
332
333 if (hists__add_entry(&evsel->hists, &al, sample->period,
334 sample->weight, sample->transaction)) {
335 pr_warning("problem incrementing symbol period, skipping event\n");
336 return -1;
337 }
338
339 evsel->hists.stats.total_period += sample->period;
340 return 0;
341}
342
343static struct perf_tool tool = {
344 .sample = diff__process_sample_event,
345 .mmap = perf_event__process_mmap,
346 .comm = perf_event__process_comm,
347 .exit = perf_event__process_exit,
348 .fork = perf_event__process_fork,
349 .lost = perf_event__process_lost,
350 .ordered_samples = true,
351 .ordering_requires_timestamps = true,
352};
353
354static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
355 struct perf_evlist *evlist)
356{
357 struct perf_evsel *e;
358
359 evlist__for_each(evlist, e) {
360 if (perf_evsel__match2(evsel, e))
361 return e;
362 }
363
364 return NULL;
365}
366
367static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
368{
369 struct perf_evsel *evsel;
370
371 evlist__for_each(evlist, evsel) {
372 struct hists *hists = &evsel->hists;
373
374 hists__collapse_resort(hists, NULL);
375 }
376}
377
378static struct hist_entry*
379get_pair_data(struct hist_entry *he, struct data__file *d)
380{
381 if (hist_entry__has_pairs(he)) {
382 struct hist_entry *pair;
383
384 list_for_each_entry(pair, &he->pairs.head, pairs.node)
385 if (pair->hists == d->hists)
386 return pair;
387 }
388
389 return NULL;
390}
391
392static struct hist_entry*
393get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
394{
395 void *ptr = dfmt - dfmt->idx;
396 struct data__file *d = container_of(ptr, struct data__file, fmt);
397
398 return get_pair_data(he, d);
399}
400
401static void hists__baseline_only(struct hists *hists)
402{
403 struct rb_root *root;
404 struct rb_node *next;
405
406 if (sort__need_collapse)
407 root = &hists->entries_collapsed;
408 else
409 root = hists->entries_in;
410
411 next = rb_first(root);
412 while (next != NULL) {
413 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
414
415 next = rb_next(&he->rb_node_in);
416 if (!hist_entry__next_pair(he)) {
417 rb_erase(&he->rb_node_in, root);
418 hist_entry__free(he);
419 }
420 }
421}
422
423static void hists__precompute(struct hists *hists)
424{
425 struct rb_root *root;
426 struct rb_node *next;
427
428 if (sort__need_collapse)
429 root = &hists->entries_collapsed;
430 else
431 root = hists->entries_in;
432
433 next = rb_first(root);
434 while (next != NULL) {
435 struct hist_entry *he, *pair;
436
437 he = rb_entry(next, struct hist_entry, rb_node_in);
438 next = rb_next(&he->rb_node_in);
439
440 pair = get_pair_data(he, &data__files[sort_compute]);
441 if (!pair)
442 continue;
443
444 switch (compute) {
445 case COMPUTE_DELTA:
446 compute_delta(he, pair);
447 break;
448 case COMPUTE_RATIO:
449 compute_ratio(he, pair);
450 break;
451 case COMPUTE_WEIGHTED_DIFF:
452 compute_wdiff(he, pair);
453 break;
454 default:
455 BUG_ON(1);
456 }
457 }
458}
459
460static int64_t cmp_doubles(double l, double r)
461{
462 if (l > r)
463 return -1;
464 else if (l < r)
465 return 1;
466 else
467 return 0;
468}
469
470static int64_t
471__hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
472 int c)
473{
474 switch (c) {
475 case COMPUTE_DELTA:
476 {
477 double l = left->diff.period_ratio_delta;
478 double r = right->diff.period_ratio_delta;
479
480 return cmp_doubles(l, r);
481 }
482 case COMPUTE_RATIO:
483 {
484 double l = left->diff.period_ratio;
485 double r = right->diff.period_ratio;
486
487 return cmp_doubles(l, r);
488 }
489 case COMPUTE_WEIGHTED_DIFF:
490 {
491 s64 l = left->diff.wdiff;
492 s64 r = right->diff.wdiff;
493
494 return r - l;
495 }
496 default:
497 BUG_ON(1);
498 }
499
500 return 0;
501}
502
503static int64_t
504hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
505 int c)
506{
507 bool pairs_left = hist_entry__has_pairs(left);
508 bool pairs_right = hist_entry__has_pairs(right);
509 struct hist_entry *p_right, *p_left;
510
511 if (!pairs_left && !pairs_right)
512 return 0;
513
514 if (!pairs_left || !pairs_right)
515 return pairs_left ? -1 : 1;
516
517 p_left = get_pair_data(left, &data__files[sort_compute]);
518 p_right = get_pair_data(right, &data__files[sort_compute]);
519
520 if (!p_left && !p_right)
521 return 0;
522
523 if (!p_left || !p_right)
524 return p_left ? -1 : 1;
525
526 /*
527 * We have 2 entries of same kind, let's
528 * make the data comparison.
529 */
530 return __hist_entry__cmp_compute(p_left, p_right, c);
531}
532
533static void insert_hist_entry_by_compute(struct rb_root *root,
534 struct hist_entry *he,
535 int c)
536{
537 struct rb_node **p = &root->rb_node;
538 struct rb_node *parent = NULL;
539 struct hist_entry *iter;
540
541 while (*p != NULL) {
542 parent = *p;
543 iter = rb_entry(parent, struct hist_entry, rb_node);
544 if (hist_entry__cmp_compute(he, iter, c) < 0)
545 p = &(*p)->rb_left;
546 else
547 p = &(*p)->rb_right;
548 }
549
550 rb_link_node(&he->rb_node, parent, p);
551 rb_insert_color(&he->rb_node, root);
552}
553
554static void hists__compute_resort(struct hists *hists)
555{
556 struct rb_root *root;
557 struct rb_node *next;
558
559 if (sort__need_collapse)
560 root = &hists->entries_collapsed;
561 else
562 root = hists->entries_in;
563
564 hists->entries = RB_ROOT;
565 next = rb_first(root);
566
567 hists->nr_entries = 0;
568 hists->stats.total_period = 0;
569 hists__reset_col_len(hists);
570
571 while (next != NULL) {
572 struct hist_entry *he;
573
574 he = rb_entry(next, struct hist_entry, rb_node_in);
575 next = rb_next(&he->rb_node_in);
576
577 insert_hist_entry_by_compute(&hists->entries, he, compute);
578 hists__inc_nr_entries(hists, he);
579 }
580}
581
582static void hists__process(struct hists *hists)
583{
584 if (show_baseline_only)
585 hists__baseline_only(hists);
586
587 if (sort_compute) {
588 hists__precompute(hists);
589 hists__compute_resort(hists);
590 } else {
591 hists__output_resort(hists);
592 }
593
594 hists__fprintf(hists, true, 0, 0, 0, stdout);
595}
596
597static void data__fprintf(void)
598{
599 struct data__file *d;
600 int i;
601
602 fprintf(stdout, "# Data files:\n");
603
604 data__for_each_file(i, d)
605 fprintf(stdout, "# [%d] %s %s\n",
606 d->idx, d->file.path,
607 !d->idx ? "(Baseline)" : "");
608
609 fprintf(stdout, "#\n");
610}
611
612static void data_process(void)
613{
614 struct perf_evlist *evlist_base = data__files[0].session->evlist;
615 struct perf_evsel *evsel_base;
616 bool first = true;
617
618 evlist__for_each(evlist_base, evsel_base) {
619 struct data__file *d;
620 int i;
621
622 data__for_each_file_new(i, d) {
623 struct perf_evlist *evlist = d->session->evlist;
624 struct perf_evsel *evsel;
625
626 evsel = evsel_match(evsel_base, evlist);
627 if (!evsel)
628 continue;
629
630 d->hists = &evsel->hists;
631
632 hists__match(&evsel_base->hists, &evsel->hists);
633
634 if (!show_baseline_only)
635 hists__link(&evsel_base->hists,
636 &evsel->hists);
637 }
638
639 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
640 perf_evsel__name(evsel_base));
641
642 first = false;
643
644 if (verbose || data__files_cnt > 2)
645 data__fprintf();
646
647 hists__process(&evsel_base->hists);
648 }
649}
650
651static void data__free(struct data__file *d)
652{
653 int col;
654
655 for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
656 struct diff_hpp_fmt *fmt = &d->fmt[col];
657
658 zfree(&fmt->header);
659 }
660}
661
662static int __cmd_diff(void)
663{
664 struct data__file *d;
665 int ret = -EINVAL, i;
666
667 data__for_each_file(i, d) {
668 d->session = perf_session__new(&d->file, false, &tool);
669 if (!d->session) {
670 pr_err("Failed to open %s\n", d->file.path);
671 ret = -ENOMEM;
672 goto out_delete;
673 }
674
675 ret = perf_session__process_events(d->session, &tool);
676 if (ret) {
677 pr_err("Failed to process %s\n", d->file.path);
678 goto out_delete;
679 }
680
681 perf_evlist__collapse_resort(d->session->evlist);
682 }
683
684 data_process();
685
686 out_delete:
687 data__for_each_file(i, d) {
688 if (d->session)
689 perf_session__delete(d->session);
690
691 data__free(d);
692 }
693
694 free(data__files);
695 return ret;
696}
697
698static const char * const diff_usage[] = {
699 "perf diff [<options>] [old_file] [new_file]",
700 NULL,
701};
702
703static const struct option options[] = {
704 OPT_INCR('v', "verbose", &verbose,
705 "be more verbose (show symbol address, etc)"),
706 OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
707 "Show only items with match in baseline"),
708 OPT_CALLBACK('c', "compute", &compute,
709 "delta,ratio,wdiff:w1,w2 (default delta)",
710 "Entries differential computation selection",
711 setup_compute),
712 OPT_BOOLEAN('p', "period", &show_period,
713 "Show period values."),
714 OPT_BOOLEAN('F', "formula", &show_formula,
715 "Show formula."),
716 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
717 "dump raw trace in ASCII"),
718 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
719 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
720 "load module symbols - WARNING: use only with -k and LIVE kernel"),
721 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
722 "only consider symbols in these dsos"),
723 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
724 "only consider symbols in these comms"),
725 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
726 "only consider these symbols"),
727 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
728 "sort by key(s): pid, comm, dso, symbol, parent"),
729 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
730 "separator for columns, no spaces will be added between "
731 "columns '.' is reserved."),
732 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
733 "Look for files with symbols relative to this directory"),
734 OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
735 OPT_END()
736};
737
738static double baseline_percent(struct hist_entry *he)
739{
740 struct hists *hists = he->hists;
741 return 100.0 * he->stat.period / hists->stats.total_period;
742}
743
744static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
745 struct perf_hpp *hpp, struct hist_entry *he)
746{
747 struct diff_hpp_fmt *dfmt =
748 container_of(fmt, struct diff_hpp_fmt, fmt);
749 double percent = baseline_percent(he);
750 char pfmt[20] = " ";
751
752 if (!he->dummy) {
753 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
754 return percent_color_snprintf(hpp->buf, hpp->size,
755 pfmt, percent);
756 } else
757 return scnprintf(hpp->buf, hpp->size, "%*s",
758 dfmt->header_width, pfmt);
759}
760
761static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
762{
763 double percent = baseline_percent(he);
764 const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
765 int ret = 0;
766
767 if (!he->dummy)
768 ret = scnprintf(buf, size, fmt, percent);
769
770 return ret;
771}
772
773static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
774 struct perf_hpp *hpp, struct hist_entry *he,
775 int comparison_method)
776{
777 struct diff_hpp_fmt *dfmt =
778 container_of(fmt, struct diff_hpp_fmt, fmt);
779 struct hist_entry *pair = get_pair_fmt(he, dfmt);
780 double diff;
781 s64 wdiff;
782 char pfmt[20] = " ";
783
784 if (!pair)
785 goto dummy_print;
786
787 switch (comparison_method) {
788 case COMPUTE_DELTA:
789 if (pair->diff.computed)
790 diff = pair->diff.period_ratio_delta;
791 else
792 diff = compute_delta(he, pair);
793
794 if (fabs(diff) < 0.01)
795 goto dummy_print;
796 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
797 return percent_color_snprintf(hpp->buf, hpp->size,
798 pfmt, diff);
799 case COMPUTE_RATIO:
800 if (he->dummy)
801 goto dummy_print;
802 if (pair->diff.computed)
803 diff = pair->diff.period_ratio;
804 else
805 diff = compute_ratio(he, pair);
806
807 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
808 return value_color_snprintf(hpp->buf, hpp->size,
809 pfmt, diff);
810 case COMPUTE_WEIGHTED_DIFF:
811 if (he->dummy)
812 goto dummy_print;
813 if (pair->diff.computed)
814 wdiff = pair->diff.wdiff;
815 else
816 wdiff = compute_wdiff(he, pair);
817
818 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
819 return color_snprintf(hpp->buf, hpp->size,
820 get_percent_color(wdiff),
821 pfmt, wdiff);
822 default:
823 BUG_ON(1);
824 }
825dummy_print:
826 return scnprintf(hpp->buf, hpp->size, "%*s",
827 dfmt->header_width, pfmt);
828}
829
830static int hpp__color_delta(struct perf_hpp_fmt *fmt,
831 struct perf_hpp *hpp, struct hist_entry *he)
832{
833 return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
834}
835
836static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
837 struct perf_hpp *hpp, struct hist_entry *he)
838{
839 return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
840}
841
842static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
843 struct perf_hpp *hpp, struct hist_entry *he)
844{
845 return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
846}
847
848static void
849hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
850{
851 switch (idx) {
852 case PERF_HPP_DIFF__PERIOD_BASELINE:
853 scnprintf(buf, size, "%" PRIu64, he->stat.period);
854 break;
855
856 default:
857 break;
858 }
859}
860
861static void
862hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
863 int idx, char *buf, size_t size)
864{
865 double diff;
866 double ratio;
867 s64 wdiff;
868
869 switch (idx) {
870 case PERF_HPP_DIFF__DELTA:
871 if (pair->diff.computed)
872 diff = pair->diff.period_ratio_delta;
873 else
874 diff = compute_delta(he, pair);
875
876 if (fabs(diff) >= 0.01)
877 scnprintf(buf, size, "%+4.2F%%", diff);
878 break;
879
880 case PERF_HPP_DIFF__RATIO:
881 /* No point for ratio number if we are dummy.. */
882 if (he->dummy)
883 break;
884
885 if (pair->diff.computed)
886 ratio = pair->diff.period_ratio;
887 else
888 ratio = compute_ratio(he, pair);
889
890 if (ratio > 0.0)
891 scnprintf(buf, size, "%14.6F", ratio);
892 break;
893
894 case PERF_HPP_DIFF__WEIGHTED_DIFF:
895 /* No point for wdiff number if we are dummy.. */
896 if (he->dummy)
897 break;
898
899 if (pair->diff.computed)
900 wdiff = pair->diff.wdiff;
901 else
902 wdiff = compute_wdiff(he, pair);
903
904 if (wdiff != 0)
905 scnprintf(buf, size, "%14ld", wdiff);
906 break;
907
908 case PERF_HPP_DIFF__FORMULA:
909 formula_fprintf(he, pair, buf, size);
910 break;
911
912 case PERF_HPP_DIFF__PERIOD:
913 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
914 break;
915
916 default:
917 BUG_ON(1);
918 };
919}
920
921static void
922__hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
923 char *buf, size_t size)
924{
925 struct hist_entry *pair = get_pair_fmt(he, dfmt);
926 int idx = dfmt->idx;
927
928 /* baseline is special */
929 if (idx == PERF_HPP_DIFF__BASELINE)
930 hpp__entry_baseline(he, buf, size);
931 else {
932 if (pair)
933 hpp__entry_pair(he, pair, idx, buf, size);
934 else
935 hpp__entry_unpair(he, idx, buf, size);
936 }
937}
938
939static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
940 struct hist_entry *he)
941{
942 struct diff_hpp_fmt *dfmt =
943 container_of(_fmt, struct diff_hpp_fmt, fmt);
944 char buf[MAX_COL_WIDTH] = " ";
945
946 __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
947
948 if (symbol_conf.field_sep)
949 return scnprintf(hpp->buf, hpp->size, "%s", buf);
950 else
951 return scnprintf(hpp->buf, hpp->size, "%*s",
952 dfmt->header_width, buf);
953}
954
955static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
956 struct perf_evsel *evsel __maybe_unused)
957{
958 struct diff_hpp_fmt *dfmt =
959 container_of(fmt, struct diff_hpp_fmt, fmt);
960
961 BUG_ON(!dfmt->header);
962 return scnprintf(hpp->buf, hpp->size, dfmt->header);
963}
964
965static int hpp__width(struct perf_hpp_fmt *fmt,
966 struct perf_hpp *hpp __maybe_unused,
967 struct perf_evsel *evsel __maybe_unused)
968{
969 struct diff_hpp_fmt *dfmt =
970 container_of(fmt, struct diff_hpp_fmt, fmt);
971
972 BUG_ON(dfmt->header_width <= 0);
973 return dfmt->header_width;
974}
975
976static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
977{
978#define MAX_HEADER_NAME 100
979 char buf_indent[MAX_HEADER_NAME];
980 char buf[MAX_HEADER_NAME];
981 const char *header = NULL;
982 int width = 0;
983
984 BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
985 header = columns[dfmt->idx].name;
986 width = columns[dfmt->idx].width;
987
988 /* Only our defined HPP fmts should appear here. */
989 BUG_ON(!header);
990
991 if (data__files_cnt > 2)
992 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
993
994#define NAME (data__files_cnt > 2 ? buf : header)
995 dfmt->header_width = width;
996 width = (int) strlen(NAME);
997 if (dfmt->header_width < width)
998 dfmt->header_width = width;
999
1000 scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1001 dfmt->header_width, NAME);
1002
1003 dfmt->header = strdup(buf_indent);
1004#undef MAX_HEADER_NAME
1005#undef NAME
1006}
1007
1008static void data__hpp_register(struct data__file *d, int idx)
1009{
1010 struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1011 struct perf_hpp_fmt *fmt = &dfmt->fmt;
1012
1013 dfmt->idx = idx;
1014
1015 fmt->header = hpp__header;
1016 fmt->width = hpp__width;
1017 fmt->entry = hpp__entry_global;
1018
1019 /* TODO more colors */
1020 switch (idx) {
1021 case PERF_HPP_DIFF__BASELINE:
1022 fmt->color = hpp__color_baseline;
1023 break;
1024 case PERF_HPP_DIFF__DELTA:
1025 fmt->color = hpp__color_delta;
1026 break;
1027 case PERF_HPP_DIFF__RATIO:
1028 fmt->color = hpp__color_ratio;
1029 break;
1030 case PERF_HPP_DIFF__WEIGHTED_DIFF:
1031 fmt->color = hpp__color_wdiff;
1032 break;
1033 default:
1034 break;
1035 }
1036
1037 init_header(d, dfmt);
1038 perf_hpp__column_register(fmt);
1039}
1040
1041static void ui_init(void)
1042{
1043 struct data__file *d;
1044 int i;
1045
1046 data__for_each_file(i, d) {
1047
1048 /*
1049 * Baseline or compute realted columns:
1050 *
1051 * PERF_HPP_DIFF__BASELINE
1052 * PERF_HPP_DIFF__DELTA
1053 * PERF_HPP_DIFF__RATIO
1054 * PERF_HPP_DIFF__WEIGHTED_DIFF
1055 */
1056 data__hpp_register(d, i ? compute_2_hpp[compute] :
1057 PERF_HPP_DIFF__BASELINE);
1058
1059 /*
1060 * And the rest:
1061 *
1062 * PERF_HPP_DIFF__FORMULA
1063 * PERF_HPP_DIFF__PERIOD
1064 * PERF_HPP_DIFF__PERIOD_BASELINE
1065 */
1066 if (show_formula && i)
1067 data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1068
1069 if (show_period)
1070 data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1071 PERF_HPP_DIFF__PERIOD_BASELINE);
1072 }
1073}
1074
1075static int data_init(int argc, const char **argv)
1076{
1077 struct data__file *d;
1078 static const char *defaults[] = {
1079 "perf.data.old",
1080 "perf.data",
1081 };
1082 bool use_default = true;
1083 int i;
1084
1085 data__files_cnt = 2;
1086
1087 if (argc) {
1088 if (argc == 1)
1089 defaults[1] = argv[0];
1090 else {
1091 data__files_cnt = argc;
1092 use_default = false;
1093 }
1094 } else if (perf_guest) {
1095 defaults[0] = "perf.data.host";
1096 defaults[1] = "perf.data.guest";
1097 }
1098
1099 if (sort_compute >= (unsigned int) data__files_cnt) {
1100 pr_err("Order option out of limit.\n");
1101 return -EINVAL;
1102 }
1103
1104 data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1105 if (!data__files)
1106 return -ENOMEM;
1107
1108 data__for_each_file(i, d) {
1109 struct perf_data_file *file = &d->file;
1110
1111 file->path = use_default ? defaults[i] : argv[i];
1112 file->mode = PERF_DATA_MODE_READ,
1113 file->force = force,
1114
1115 d->idx = i;
1116 }
1117
1118 return 0;
1119}
1120
1121int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1122{
1123 sort_order = diff__default_sort_order;
1124 argc = parse_options(argc, argv, options, diff_usage, 0);
1125
1126 if (symbol__init() < 0)
1127 return -1;
1128
1129 if (data_init(argc, argv) < 0)
1130 return -1;
1131
1132 ui_init();
1133
1134 if (setup_sorting() < 0)
1135 usage_with_options(diff_usage, options);
1136
1137 setup_pager();
1138
1139 sort__setup_elide(NULL);
1140
1141 return __cmd_diff();
1142}
1/*
2 * builtin-diff.c
3 *
4 * Builtin diff command: Analyze two perf.data input files, look up and read
5 * DSOs and symbol information, sort them and produce a diff.
6 */
7#include "builtin.h"
8
9#include "util/debug.h"
10#include "util/event.h"
11#include "util/hist.h"
12#include "util/evsel.h"
13#include "util/evlist.h"
14#include "util/session.h"
15#include "util/tool.h"
16#include "util/sort.h"
17#include "util/symbol.h"
18#include "util/util.h"
19#include "util/data.h"
20
21#include <stdlib.h>
22#include <math.h>
23
24/* Diff command specific HPP columns. */
25enum {
26 PERF_HPP_DIFF__BASELINE,
27 PERF_HPP_DIFF__PERIOD,
28 PERF_HPP_DIFF__PERIOD_BASELINE,
29 PERF_HPP_DIFF__DELTA,
30 PERF_HPP_DIFF__RATIO,
31 PERF_HPP_DIFF__WEIGHTED_DIFF,
32 PERF_HPP_DIFF__FORMULA,
33
34 PERF_HPP_DIFF__MAX_INDEX
35};
36
37struct diff_hpp_fmt {
38 struct perf_hpp_fmt fmt;
39 int idx;
40 char *header;
41 int header_width;
42};
43
44struct data__file {
45 struct perf_session *session;
46 struct perf_data_file file;
47 int idx;
48 struct hists *hists;
49 struct diff_hpp_fmt fmt[PERF_HPP_DIFF__MAX_INDEX];
50};
51
52static struct data__file *data__files;
53static int data__files_cnt;
54
55#define data__for_each_file_start(i, d, s) \
56 for (i = s, d = &data__files[s]; \
57 i < data__files_cnt; \
58 i++, d = &data__files[i])
59
60#define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
61#define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
62
63static bool force;
64static bool show_period;
65static bool show_formula;
66static bool show_baseline_only;
67static unsigned int sort_compute;
68
69static s64 compute_wdiff_w1;
70static s64 compute_wdiff_w2;
71
72enum {
73 COMPUTE_DELTA,
74 COMPUTE_RATIO,
75 COMPUTE_WEIGHTED_DIFF,
76 COMPUTE_MAX,
77};
78
79const char *compute_names[COMPUTE_MAX] = {
80 [COMPUTE_DELTA] = "delta",
81 [COMPUTE_RATIO] = "ratio",
82 [COMPUTE_WEIGHTED_DIFF] = "wdiff",
83};
84
85static int compute;
86
87static int compute_2_hpp[COMPUTE_MAX] = {
88 [COMPUTE_DELTA] = PERF_HPP_DIFF__DELTA,
89 [COMPUTE_RATIO] = PERF_HPP_DIFF__RATIO,
90 [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
91};
92
93#define MAX_COL_WIDTH 70
94
95static struct header_column {
96 const char *name;
97 int width;
98} columns[PERF_HPP_DIFF__MAX_INDEX] = {
99 [PERF_HPP_DIFF__BASELINE] = {
100 .name = "Baseline",
101 },
102 [PERF_HPP_DIFF__PERIOD] = {
103 .name = "Period",
104 .width = 14,
105 },
106 [PERF_HPP_DIFF__PERIOD_BASELINE] = {
107 .name = "Base period",
108 .width = 14,
109 },
110 [PERF_HPP_DIFF__DELTA] = {
111 .name = "Delta",
112 .width = 7,
113 },
114 [PERF_HPP_DIFF__RATIO] = {
115 .name = "Ratio",
116 .width = 14,
117 },
118 [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
119 .name = "Weighted diff",
120 .width = 14,
121 },
122 [PERF_HPP_DIFF__FORMULA] = {
123 .name = "Formula",
124 .width = MAX_COL_WIDTH,
125 }
126};
127
128static int setup_compute_opt_wdiff(char *opt)
129{
130 char *w1_str = opt;
131 char *w2_str;
132
133 int ret = -EINVAL;
134
135 if (!opt)
136 goto out;
137
138 w2_str = strchr(opt, ',');
139 if (!w2_str)
140 goto out;
141
142 *w2_str++ = 0x0;
143 if (!*w2_str)
144 goto out;
145
146 compute_wdiff_w1 = strtol(w1_str, NULL, 10);
147 compute_wdiff_w2 = strtol(w2_str, NULL, 10);
148
149 if (!compute_wdiff_w1 || !compute_wdiff_w2)
150 goto out;
151
152 pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
153 compute_wdiff_w1, compute_wdiff_w2);
154
155 ret = 0;
156
157 out:
158 if (ret)
159 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
160
161 return ret;
162}
163
164static int setup_compute_opt(char *opt)
165{
166 if (compute == COMPUTE_WEIGHTED_DIFF)
167 return setup_compute_opt_wdiff(opt);
168
169 if (opt) {
170 pr_err("Failed: extra option specified '%s'", opt);
171 return -EINVAL;
172 }
173
174 return 0;
175}
176
177static int setup_compute(const struct option *opt, const char *str,
178 int unset __maybe_unused)
179{
180 int *cp = (int *) opt->value;
181 char *cstr = (char *) str;
182 char buf[50];
183 unsigned i;
184 char *option;
185
186 if (!str) {
187 *cp = COMPUTE_DELTA;
188 return 0;
189 }
190
191 option = strchr(str, ':');
192 if (option) {
193 unsigned len = option++ - str;
194
195 /*
196 * The str data are not writeable, so we need
197 * to use another buffer.
198 */
199
200 /* No option value is longer. */
201 if (len >= sizeof(buf))
202 return -EINVAL;
203
204 strncpy(buf, str, len);
205 buf[len] = 0x0;
206 cstr = buf;
207 }
208
209 for (i = 0; i < COMPUTE_MAX; i++)
210 if (!strcmp(cstr, compute_names[i])) {
211 *cp = i;
212 return setup_compute_opt(option);
213 }
214
215 pr_err("Failed: '%s' is not computation method "
216 "(use 'delta','ratio' or 'wdiff')\n", str);
217 return -EINVAL;
218}
219
220static double period_percent(struct hist_entry *he, u64 period)
221{
222 u64 total = hists__total_period(he->hists);
223
224 return (period * 100.0) / total;
225}
226
227static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
228{
229 double old_percent = period_percent(he, he->stat.period);
230 double new_percent = period_percent(pair, pair->stat.period);
231
232 pair->diff.period_ratio_delta = new_percent - old_percent;
233 pair->diff.computed = true;
234 return pair->diff.period_ratio_delta;
235}
236
237static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
238{
239 double old_period = he->stat.period ?: 1;
240 double new_period = pair->stat.period;
241
242 pair->diff.computed = true;
243 pair->diff.period_ratio = new_period / old_period;
244 return pair->diff.period_ratio;
245}
246
247static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
248{
249 u64 old_period = he->stat.period;
250 u64 new_period = pair->stat.period;
251
252 pair->diff.computed = true;
253 pair->diff.wdiff = new_period * compute_wdiff_w2 -
254 old_period * compute_wdiff_w1;
255
256 return pair->diff.wdiff;
257}
258
259static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
260 char *buf, size_t size)
261{
262 u64 he_total = he->hists->stats.total_period;
263 u64 pair_total = pair->hists->stats.total_period;
264
265 if (symbol_conf.filter_relative) {
266 he_total = he->hists->stats.total_non_filtered_period;
267 pair_total = pair->hists->stats.total_non_filtered_period;
268 }
269 return scnprintf(buf, size,
270 "(%" PRIu64 " * 100 / %" PRIu64 ") - "
271 "(%" PRIu64 " * 100 / %" PRIu64 ")",
272 pair->stat.period, pair_total,
273 he->stat.period, he_total);
274}
275
276static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
277 char *buf, size_t size)
278{
279 double old_period = he->stat.period;
280 double new_period = pair->stat.period;
281
282 return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
283}
284
285static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
286 char *buf, size_t size)
287{
288 u64 old_period = he->stat.period;
289 u64 new_period = pair->stat.period;
290
291 return scnprintf(buf, size,
292 "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
293 new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
294}
295
296static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
297 char *buf, size_t size)
298{
299 switch (compute) {
300 case COMPUTE_DELTA:
301 return formula_delta(he, pair, buf, size);
302 case COMPUTE_RATIO:
303 return formula_ratio(he, pair, buf, size);
304 case COMPUTE_WEIGHTED_DIFF:
305 return formula_wdiff(he, pair, buf, size);
306 default:
307 BUG_ON(1);
308 }
309
310 return -1;
311}
312
313static int hists__add_entry(struct hists *hists,
314 struct addr_location *al,
315 struct perf_sample *sample)
316{
317 if (__hists__add_entry(hists, al, NULL, NULL, NULL,
318 sample, true) != NULL)
319 return 0;
320 return -ENOMEM;
321}
322
323static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
324 union perf_event *event,
325 struct perf_sample *sample,
326 struct perf_evsel *evsel,
327 struct machine *machine)
328{
329 struct addr_location al;
330 struct hists *hists = evsel__hists(evsel);
331 int ret = -1;
332
333 if (machine__resolve(machine, &al, sample) < 0) {
334 pr_warning("problem processing %d event, skipping it.\n",
335 event->header.type);
336 return -1;
337 }
338
339 if (hists__add_entry(hists, &al, sample)) {
340 pr_warning("problem incrementing symbol period, skipping event\n");
341 goto out_put;
342 }
343
344 /*
345 * The total_period is updated here before going to the output
346 * tree since normally only the baseline hists will call
347 * hists__output_resort() and precompute needs the total
348 * period in order to sort entries by percentage delta.
349 */
350 hists->stats.total_period += sample->period;
351 if (!al.filtered)
352 hists->stats.total_non_filtered_period += sample->period;
353 ret = 0;
354out_put:
355 addr_location__put(&al);
356 return ret;
357}
358
359static struct perf_tool tool = {
360 .sample = diff__process_sample_event,
361 .mmap = perf_event__process_mmap,
362 .mmap2 = perf_event__process_mmap2,
363 .comm = perf_event__process_comm,
364 .exit = perf_event__process_exit,
365 .fork = perf_event__process_fork,
366 .lost = perf_event__process_lost,
367 .ordered_events = true,
368 .ordering_requires_timestamps = true,
369};
370
371static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
372 struct perf_evlist *evlist)
373{
374 struct perf_evsel *e;
375
376 evlist__for_each(evlist, e) {
377 if (perf_evsel__match2(evsel, e))
378 return e;
379 }
380
381 return NULL;
382}
383
384static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
385{
386 struct perf_evsel *evsel;
387
388 evlist__for_each(evlist, evsel) {
389 struct hists *hists = evsel__hists(evsel);
390
391 hists__collapse_resort(hists, NULL);
392 }
393}
394
395static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
396{
397 struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
398 void *ptr = dfmt - dfmt->idx;
399 struct data__file *d = container_of(ptr, struct data__file, fmt);
400
401 return d;
402}
403
404static struct hist_entry*
405get_pair_data(struct hist_entry *he, struct data__file *d)
406{
407 if (hist_entry__has_pairs(he)) {
408 struct hist_entry *pair;
409
410 list_for_each_entry(pair, &he->pairs.head, pairs.node)
411 if (pair->hists == d->hists)
412 return pair;
413 }
414
415 return NULL;
416}
417
418static struct hist_entry*
419get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
420{
421 struct data__file *d = fmt_to_data_file(&dfmt->fmt);
422
423 return get_pair_data(he, d);
424}
425
426static void hists__baseline_only(struct hists *hists)
427{
428 struct rb_root *root;
429 struct rb_node *next;
430
431 if (sort__need_collapse)
432 root = &hists->entries_collapsed;
433 else
434 root = hists->entries_in;
435
436 next = rb_first(root);
437 while (next != NULL) {
438 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
439
440 next = rb_next(&he->rb_node_in);
441 if (!hist_entry__next_pair(he)) {
442 rb_erase(&he->rb_node_in, root);
443 hist_entry__delete(he);
444 }
445 }
446}
447
448static void hists__precompute(struct hists *hists)
449{
450 struct rb_root *root;
451 struct rb_node *next;
452
453 if (sort__need_collapse)
454 root = &hists->entries_collapsed;
455 else
456 root = hists->entries_in;
457
458 next = rb_first(root);
459 while (next != NULL) {
460 struct hist_entry *he, *pair;
461 struct data__file *d;
462 int i;
463
464 he = rb_entry(next, struct hist_entry, rb_node_in);
465 next = rb_next(&he->rb_node_in);
466
467 data__for_each_file_new(i, d) {
468 pair = get_pair_data(he, d);
469 if (!pair)
470 continue;
471
472 switch (compute) {
473 case COMPUTE_DELTA:
474 compute_delta(he, pair);
475 break;
476 case COMPUTE_RATIO:
477 compute_ratio(he, pair);
478 break;
479 case COMPUTE_WEIGHTED_DIFF:
480 compute_wdiff(he, pair);
481 break;
482 default:
483 BUG_ON(1);
484 }
485 }
486 }
487}
488
489static int64_t cmp_doubles(double l, double r)
490{
491 if (l > r)
492 return -1;
493 else if (l < r)
494 return 1;
495 else
496 return 0;
497}
498
499static int64_t
500__hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
501 int c)
502{
503 switch (c) {
504 case COMPUTE_DELTA:
505 {
506 double l = left->diff.period_ratio_delta;
507 double r = right->diff.period_ratio_delta;
508
509 return cmp_doubles(l, r);
510 }
511 case COMPUTE_RATIO:
512 {
513 double l = left->diff.period_ratio;
514 double r = right->diff.period_ratio;
515
516 return cmp_doubles(l, r);
517 }
518 case COMPUTE_WEIGHTED_DIFF:
519 {
520 s64 l = left->diff.wdiff;
521 s64 r = right->diff.wdiff;
522
523 return r - l;
524 }
525 default:
526 BUG_ON(1);
527 }
528
529 return 0;
530}
531
532static int64_t
533hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
534 int c, int sort_idx)
535{
536 bool pairs_left = hist_entry__has_pairs(left);
537 bool pairs_right = hist_entry__has_pairs(right);
538 struct hist_entry *p_right, *p_left;
539
540 if (!pairs_left && !pairs_right)
541 return 0;
542
543 if (!pairs_left || !pairs_right)
544 return pairs_left ? -1 : 1;
545
546 p_left = get_pair_data(left, &data__files[sort_idx]);
547 p_right = get_pair_data(right, &data__files[sort_idx]);
548
549 if (!p_left && !p_right)
550 return 0;
551
552 if (!p_left || !p_right)
553 return p_left ? -1 : 1;
554
555 /*
556 * We have 2 entries of same kind, let's
557 * make the data comparison.
558 */
559 return __hist_entry__cmp_compute(p_left, p_right, c);
560}
561
562static int64_t
563hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
564 int c, int sort_idx)
565{
566 struct hist_entry *p_right, *p_left;
567
568 p_left = get_pair_data(left, &data__files[sort_idx]);
569 p_right = get_pair_data(right, &data__files[sort_idx]);
570
571 if (!p_left && !p_right)
572 return 0;
573
574 if (!p_left || !p_right)
575 return p_left ? -1 : 1;
576
577 if (c != COMPUTE_DELTA) {
578 /*
579 * The delta can be computed without the baseline, but
580 * others are not. Put those entries which have no
581 * values below.
582 */
583 if (left->dummy && right->dummy)
584 return 0;
585
586 if (left->dummy || right->dummy)
587 return left->dummy ? 1 : -1;
588 }
589
590 return __hist_entry__cmp_compute(p_left, p_right, c);
591}
592
593static int64_t
594hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
595 struct hist_entry *left __maybe_unused,
596 struct hist_entry *right __maybe_unused)
597{
598 return 0;
599}
600
601static int64_t
602hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
603 struct hist_entry *left, struct hist_entry *right)
604{
605 if (left->stat.period == right->stat.period)
606 return 0;
607 return left->stat.period > right->stat.period ? 1 : -1;
608}
609
610static int64_t
611hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
612 struct hist_entry *left, struct hist_entry *right)
613{
614 struct data__file *d = fmt_to_data_file(fmt);
615
616 return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
617}
618
619static int64_t
620hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
621 struct hist_entry *left, struct hist_entry *right)
622{
623 struct data__file *d = fmt_to_data_file(fmt);
624
625 return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
626}
627
628static int64_t
629hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
630 struct hist_entry *left, struct hist_entry *right)
631{
632 struct data__file *d = fmt_to_data_file(fmt);
633
634 return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
635}
636
637static int64_t
638hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
639 struct hist_entry *left, struct hist_entry *right)
640{
641 return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
642 sort_compute);
643}
644
645static int64_t
646hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
647 struct hist_entry *left, struct hist_entry *right)
648{
649 return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
650 sort_compute);
651}
652
653static int64_t
654hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
655 struct hist_entry *left, struct hist_entry *right)
656{
657 return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
658 sort_compute);
659}
660
661static void hists__process(struct hists *hists)
662{
663 if (show_baseline_only)
664 hists__baseline_only(hists);
665
666 hists__precompute(hists);
667 hists__output_resort(hists, NULL);
668
669 hists__fprintf(hists, true, 0, 0, 0, stdout);
670}
671
672static void data__fprintf(void)
673{
674 struct data__file *d;
675 int i;
676
677 fprintf(stdout, "# Data files:\n");
678
679 data__for_each_file(i, d)
680 fprintf(stdout, "# [%d] %s %s\n",
681 d->idx, d->file.path,
682 !d->idx ? "(Baseline)" : "");
683
684 fprintf(stdout, "#\n");
685}
686
687static void data_process(void)
688{
689 struct perf_evlist *evlist_base = data__files[0].session->evlist;
690 struct perf_evsel *evsel_base;
691 bool first = true;
692
693 evlist__for_each(evlist_base, evsel_base) {
694 struct hists *hists_base = evsel__hists(evsel_base);
695 struct data__file *d;
696 int i;
697
698 data__for_each_file_new(i, d) {
699 struct perf_evlist *evlist = d->session->evlist;
700 struct perf_evsel *evsel;
701 struct hists *hists;
702
703 evsel = evsel_match(evsel_base, evlist);
704 if (!evsel)
705 continue;
706
707 hists = evsel__hists(evsel);
708 d->hists = hists;
709
710 hists__match(hists_base, hists);
711
712 if (!show_baseline_only)
713 hists__link(hists_base, hists);
714 }
715
716 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
717 perf_evsel__name(evsel_base));
718
719 first = false;
720
721 if (verbose || data__files_cnt > 2)
722 data__fprintf();
723
724 /* Don't sort callchain for perf diff */
725 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
726
727 hists__process(hists_base);
728 }
729}
730
731static void data__free(struct data__file *d)
732{
733 int col;
734
735 for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
736 struct diff_hpp_fmt *fmt = &d->fmt[col];
737
738 zfree(&fmt->header);
739 }
740}
741
742static int __cmd_diff(void)
743{
744 struct data__file *d;
745 int ret = -EINVAL, i;
746
747 data__for_each_file(i, d) {
748 d->session = perf_session__new(&d->file, false, &tool);
749 if (!d->session) {
750 pr_err("Failed to open %s\n", d->file.path);
751 ret = -1;
752 goto out_delete;
753 }
754
755 ret = perf_session__process_events(d->session);
756 if (ret) {
757 pr_err("Failed to process %s\n", d->file.path);
758 goto out_delete;
759 }
760
761 perf_evlist__collapse_resort(d->session->evlist);
762 }
763
764 data_process();
765
766 out_delete:
767 data__for_each_file(i, d) {
768 if (d->session)
769 perf_session__delete(d->session);
770
771 data__free(d);
772 }
773
774 free(data__files);
775 return ret;
776}
777
778static const char * const diff_usage[] = {
779 "perf diff [<options>] [old_file] [new_file]",
780 NULL,
781};
782
783static const struct option options[] = {
784 OPT_INCR('v', "verbose", &verbose,
785 "be more verbose (show symbol address, etc)"),
786 OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
787 "Show only items with match in baseline"),
788 OPT_CALLBACK('c', "compute", &compute,
789 "delta,ratio,wdiff:w1,w2 (default delta)",
790 "Entries differential computation selection",
791 setup_compute),
792 OPT_BOOLEAN('p', "period", &show_period,
793 "Show period values."),
794 OPT_BOOLEAN('F', "formula", &show_formula,
795 "Show formula."),
796 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
797 "dump raw trace in ASCII"),
798 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
799 OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
800 "file", "kallsyms pathname"),
801 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
802 "load module symbols - WARNING: use only with -k and LIVE kernel"),
803 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
804 "only consider symbols in these dsos"),
805 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
806 "only consider symbols in these comms"),
807 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
808 "only consider these symbols"),
809 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
810 "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
811 " Please refer the man page for the complete list."),
812 OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
813 "separator for columns, no spaces will be added between "
814 "columns '.' is reserved."),
815 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
816 "Look for files with symbols relative to this directory"),
817 OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
818 OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
819 "How to display percentage of filtered entries", parse_filter_percentage),
820 OPT_END()
821};
822
823static double baseline_percent(struct hist_entry *he)
824{
825 u64 total = hists__total_period(he->hists);
826
827 return 100.0 * he->stat.period / total;
828}
829
830static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
831 struct perf_hpp *hpp, struct hist_entry *he)
832{
833 struct diff_hpp_fmt *dfmt =
834 container_of(fmt, struct diff_hpp_fmt, fmt);
835 double percent = baseline_percent(he);
836 char pfmt[20] = " ";
837
838 if (!he->dummy) {
839 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
840 return percent_color_snprintf(hpp->buf, hpp->size,
841 pfmt, percent);
842 } else
843 return scnprintf(hpp->buf, hpp->size, "%*s",
844 dfmt->header_width, pfmt);
845}
846
847static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
848{
849 double percent = baseline_percent(he);
850 const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
851 int ret = 0;
852
853 if (!he->dummy)
854 ret = scnprintf(buf, size, fmt, percent);
855
856 return ret;
857}
858
859static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
860 struct perf_hpp *hpp, struct hist_entry *he,
861 int comparison_method)
862{
863 struct diff_hpp_fmt *dfmt =
864 container_of(fmt, struct diff_hpp_fmt, fmt);
865 struct hist_entry *pair = get_pair_fmt(he, dfmt);
866 double diff;
867 s64 wdiff;
868 char pfmt[20] = " ";
869
870 if (!pair)
871 goto no_print;
872
873 switch (comparison_method) {
874 case COMPUTE_DELTA:
875 if (pair->diff.computed)
876 diff = pair->diff.period_ratio_delta;
877 else
878 diff = compute_delta(he, pair);
879
880 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
881 return percent_color_snprintf(hpp->buf, hpp->size,
882 pfmt, diff);
883 case COMPUTE_RATIO:
884 if (he->dummy)
885 goto dummy_print;
886 if (pair->diff.computed)
887 diff = pair->diff.period_ratio;
888 else
889 diff = compute_ratio(he, pair);
890
891 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
892 return value_color_snprintf(hpp->buf, hpp->size,
893 pfmt, diff);
894 case COMPUTE_WEIGHTED_DIFF:
895 if (he->dummy)
896 goto dummy_print;
897 if (pair->diff.computed)
898 wdiff = pair->diff.wdiff;
899 else
900 wdiff = compute_wdiff(he, pair);
901
902 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
903 return color_snprintf(hpp->buf, hpp->size,
904 get_percent_color(wdiff),
905 pfmt, wdiff);
906 default:
907 BUG_ON(1);
908 }
909dummy_print:
910 return scnprintf(hpp->buf, hpp->size, "%*s",
911 dfmt->header_width, "N/A");
912no_print:
913 return scnprintf(hpp->buf, hpp->size, "%*s",
914 dfmt->header_width, pfmt);
915}
916
917static int hpp__color_delta(struct perf_hpp_fmt *fmt,
918 struct perf_hpp *hpp, struct hist_entry *he)
919{
920 return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
921}
922
923static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
924 struct perf_hpp *hpp, struct hist_entry *he)
925{
926 return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
927}
928
929static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
930 struct perf_hpp *hpp, struct hist_entry *he)
931{
932 return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
933}
934
935static void
936hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
937{
938 switch (idx) {
939 case PERF_HPP_DIFF__PERIOD_BASELINE:
940 scnprintf(buf, size, "%" PRIu64, he->stat.period);
941 break;
942
943 default:
944 break;
945 }
946}
947
948static void
949hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
950 int idx, char *buf, size_t size)
951{
952 double diff;
953 double ratio;
954 s64 wdiff;
955
956 switch (idx) {
957 case PERF_HPP_DIFF__DELTA:
958 if (pair->diff.computed)
959 diff = pair->diff.period_ratio_delta;
960 else
961 diff = compute_delta(he, pair);
962
963 scnprintf(buf, size, "%+4.2F%%", diff);
964 break;
965
966 case PERF_HPP_DIFF__RATIO:
967 /* No point for ratio number if we are dummy.. */
968 if (he->dummy) {
969 scnprintf(buf, size, "N/A");
970 break;
971 }
972
973 if (pair->diff.computed)
974 ratio = pair->diff.period_ratio;
975 else
976 ratio = compute_ratio(he, pair);
977
978 if (ratio > 0.0)
979 scnprintf(buf, size, "%14.6F", ratio);
980 break;
981
982 case PERF_HPP_DIFF__WEIGHTED_DIFF:
983 /* No point for wdiff number if we are dummy.. */
984 if (he->dummy) {
985 scnprintf(buf, size, "N/A");
986 break;
987 }
988
989 if (pair->diff.computed)
990 wdiff = pair->diff.wdiff;
991 else
992 wdiff = compute_wdiff(he, pair);
993
994 if (wdiff != 0)
995 scnprintf(buf, size, "%14ld", wdiff);
996 break;
997
998 case PERF_HPP_DIFF__FORMULA:
999 formula_fprintf(he, pair, buf, size);
1000 break;
1001
1002 case PERF_HPP_DIFF__PERIOD:
1003 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1004 break;
1005
1006 default:
1007 BUG_ON(1);
1008 };
1009}
1010
1011static void
1012__hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1013 char *buf, size_t size)
1014{
1015 struct hist_entry *pair = get_pair_fmt(he, dfmt);
1016 int idx = dfmt->idx;
1017
1018 /* baseline is special */
1019 if (idx == PERF_HPP_DIFF__BASELINE)
1020 hpp__entry_baseline(he, buf, size);
1021 else {
1022 if (pair)
1023 hpp__entry_pair(he, pair, idx, buf, size);
1024 else
1025 hpp__entry_unpair(he, idx, buf, size);
1026 }
1027}
1028
1029static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1030 struct hist_entry *he)
1031{
1032 struct diff_hpp_fmt *dfmt =
1033 container_of(_fmt, struct diff_hpp_fmt, fmt);
1034 char buf[MAX_COL_WIDTH] = " ";
1035
1036 __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1037
1038 if (symbol_conf.field_sep)
1039 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1040 else
1041 return scnprintf(hpp->buf, hpp->size, "%*s",
1042 dfmt->header_width, buf);
1043}
1044
1045static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1046 struct perf_evsel *evsel __maybe_unused)
1047{
1048 struct diff_hpp_fmt *dfmt =
1049 container_of(fmt, struct diff_hpp_fmt, fmt);
1050
1051 BUG_ON(!dfmt->header);
1052 return scnprintf(hpp->buf, hpp->size, dfmt->header);
1053}
1054
1055static int hpp__width(struct perf_hpp_fmt *fmt,
1056 struct perf_hpp *hpp __maybe_unused,
1057 struct perf_evsel *evsel __maybe_unused)
1058{
1059 struct diff_hpp_fmt *dfmt =
1060 container_of(fmt, struct diff_hpp_fmt, fmt);
1061
1062 BUG_ON(dfmt->header_width <= 0);
1063 return dfmt->header_width;
1064}
1065
1066static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1067{
1068#define MAX_HEADER_NAME 100
1069 char buf_indent[MAX_HEADER_NAME];
1070 char buf[MAX_HEADER_NAME];
1071 const char *header = NULL;
1072 int width = 0;
1073
1074 BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1075 header = columns[dfmt->idx].name;
1076 width = columns[dfmt->idx].width;
1077
1078 /* Only our defined HPP fmts should appear here. */
1079 BUG_ON(!header);
1080
1081 if (data__files_cnt > 2)
1082 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1083
1084#define NAME (data__files_cnt > 2 ? buf : header)
1085 dfmt->header_width = width;
1086 width = (int) strlen(NAME);
1087 if (dfmt->header_width < width)
1088 dfmt->header_width = width;
1089
1090 scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1091 dfmt->header_width, NAME);
1092
1093 dfmt->header = strdup(buf_indent);
1094#undef MAX_HEADER_NAME
1095#undef NAME
1096}
1097
1098static void data__hpp_register(struct data__file *d, int idx)
1099{
1100 struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1101 struct perf_hpp_fmt *fmt = &dfmt->fmt;
1102
1103 dfmt->idx = idx;
1104
1105 fmt->header = hpp__header;
1106 fmt->width = hpp__width;
1107 fmt->entry = hpp__entry_global;
1108 fmt->cmp = hist_entry__cmp_nop;
1109 fmt->collapse = hist_entry__cmp_nop;
1110
1111 /* TODO more colors */
1112 switch (idx) {
1113 case PERF_HPP_DIFF__BASELINE:
1114 fmt->color = hpp__color_baseline;
1115 fmt->sort = hist_entry__cmp_baseline;
1116 break;
1117 case PERF_HPP_DIFF__DELTA:
1118 fmt->color = hpp__color_delta;
1119 fmt->sort = hist_entry__cmp_delta;
1120 break;
1121 case PERF_HPP_DIFF__RATIO:
1122 fmt->color = hpp__color_ratio;
1123 fmt->sort = hist_entry__cmp_ratio;
1124 break;
1125 case PERF_HPP_DIFF__WEIGHTED_DIFF:
1126 fmt->color = hpp__color_wdiff;
1127 fmt->sort = hist_entry__cmp_wdiff;
1128 break;
1129 default:
1130 fmt->sort = hist_entry__cmp_nop;
1131 break;
1132 }
1133
1134 init_header(d, dfmt);
1135 perf_hpp__column_register(fmt);
1136 perf_hpp__register_sort_field(fmt);
1137}
1138
1139static int ui_init(void)
1140{
1141 struct data__file *d;
1142 struct perf_hpp_fmt *fmt;
1143 int i;
1144
1145 data__for_each_file(i, d) {
1146
1147 /*
1148 * Baseline or compute realted columns:
1149 *
1150 * PERF_HPP_DIFF__BASELINE
1151 * PERF_HPP_DIFF__DELTA
1152 * PERF_HPP_DIFF__RATIO
1153 * PERF_HPP_DIFF__WEIGHTED_DIFF
1154 */
1155 data__hpp_register(d, i ? compute_2_hpp[compute] :
1156 PERF_HPP_DIFF__BASELINE);
1157
1158 /*
1159 * And the rest:
1160 *
1161 * PERF_HPP_DIFF__FORMULA
1162 * PERF_HPP_DIFF__PERIOD
1163 * PERF_HPP_DIFF__PERIOD_BASELINE
1164 */
1165 if (show_formula && i)
1166 data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1167
1168 if (show_period)
1169 data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1170 PERF_HPP_DIFF__PERIOD_BASELINE);
1171 }
1172
1173 if (!sort_compute)
1174 return 0;
1175
1176 /*
1177 * Prepend an fmt to sort on columns at 'sort_compute' first.
1178 * This fmt is added only to the sort list but not to the
1179 * output fields list.
1180 *
1181 * Note that this column (data) can be compared twice - one
1182 * for this 'sort_compute' fmt and another for the normal
1183 * diff_hpp_fmt. But it shouldn't a problem as most entries
1184 * will be sorted out by first try or baseline and comparing
1185 * is not a costly operation.
1186 */
1187 fmt = zalloc(sizeof(*fmt));
1188 if (fmt == NULL) {
1189 pr_err("Memory allocation failed\n");
1190 return -1;
1191 }
1192
1193 fmt->cmp = hist_entry__cmp_nop;
1194 fmt->collapse = hist_entry__cmp_nop;
1195
1196 switch (compute) {
1197 case COMPUTE_DELTA:
1198 fmt->sort = hist_entry__cmp_delta_idx;
1199 break;
1200 case COMPUTE_RATIO:
1201 fmt->sort = hist_entry__cmp_ratio_idx;
1202 break;
1203 case COMPUTE_WEIGHTED_DIFF:
1204 fmt->sort = hist_entry__cmp_wdiff_idx;
1205 break;
1206 default:
1207 BUG_ON(1);
1208 }
1209
1210 perf_hpp__register_sort_field(fmt);
1211 return 0;
1212}
1213
1214static int data_init(int argc, const char **argv)
1215{
1216 struct data__file *d;
1217 static const char *defaults[] = {
1218 "perf.data.old",
1219 "perf.data",
1220 };
1221 bool use_default = true;
1222 int i;
1223
1224 data__files_cnt = 2;
1225
1226 if (argc) {
1227 if (argc == 1)
1228 defaults[1] = argv[0];
1229 else {
1230 data__files_cnt = argc;
1231 use_default = false;
1232 }
1233 } else if (perf_guest) {
1234 defaults[0] = "perf.data.host";
1235 defaults[1] = "perf.data.guest";
1236 }
1237
1238 if (sort_compute >= (unsigned int) data__files_cnt) {
1239 pr_err("Order option out of limit.\n");
1240 return -EINVAL;
1241 }
1242
1243 data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1244 if (!data__files)
1245 return -ENOMEM;
1246
1247 data__for_each_file(i, d) {
1248 struct perf_data_file *file = &d->file;
1249
1250 file->path = use_default ? defaults[i] : argv[i];
1251 file->mode = PERF_DATA_MODE_READ,
1252 file->force = force,
1253
1254 d->idx = i;
1255 }
1256
1257 return 0;
1258}
1259
1260int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1261{
1262 int ret = hists__init();
1263
1264 if (ret < 0)
1265 return ret;
1266
1267 argc = parse_options(argc, argv, options, diff_usage, 0);
1268
1269 if (symbol__init(NULL) < 0)
1270 return -1;
1271
1272 if (data_init(argc, argv) < 0)
1273 return -1;
1274
1275 if (ui_init() < 0)
1276 return -1;
1277
1278 sort__mode = SORT_MODE__DIFF;
1279
1280 if (setup_sorting(NULL) < 0)
1281 usage_with_options(diff_usage, options);
1282
1283 setup_pager();
1284
1285 sort__setup_elide(NULL);
1286
1287 return __cmd_diff();
1288}