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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 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}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * builtin-diff.c
4 *
5 * Builtin diff command: Analyze two perf.data input files, look up and read
6 * DSOs and symbol information, sort them and produce a diff.
7 */
8#include "builtin.h"
9#include "perf.h"
10
11#include "util/debug.h"
12#include "util/event.h"
13#include "util/hist.h"
14#include "util/evsel.h"
15#include "util/evlist.h"
16#include "util/session.h"
17#include "util/tool.h"
18#include "util/sort.h"
19#include "util/srcline.h"
20#include "util/symbol.h"
21#include "util/data.h"
22#include "util/config.h"
23#include "util/time-utils.h"
24#include "util/annotate.h"
25#include "util/map.h"
26#include "util/spark.h"
27#include "util/block-info.h"
28#include <linux/err.h>
29#include <linux/zalloc.h>
30#include <subcmd/pager.h>
31#include <subcmd/parse-options.h>
32
33#include <errno.h>
34#include <inttypes.h>
35#include <stdlib.h>
36#include <math.h>
37
38struct perf_diff {
39 struct perf_tool tool;
40 const char *time_str;
41 struct perf_time_interval *ptime_range;
42 int range_size;
43 int range_num;
44 bool has_br_stack;
45};
46
47/* Diff command specific HPP columns. */
48enum {
49 PERF_HPP_DIFF__BASELINE,
50 PERF_HPP_DIFF__PERIOD,
51 PERF_HPP_DIFF__PERIOD_BASELINE,
52 PERF_HPP_DIFF__DELTA,
53 PERF_HPP_DIFF__RATIO,
54 PERF_HPP_DIFF__WEIGHTED_DIFF,
55 PERF_HPP_DIFF__FORMULA,
56 PERF_HPP_DIFF__DELTA_ABS,
57 PERF_HPP_DIFF__CYCLES,
58 PERF_HPP_DIFF__CYCLES_HIST,
59
60 PERF_HPP_DIFF__MAX_INDEX
61};
62
63struct diff_hpp_fmt {
64 struct perf_hpp_fmt fmt;
65 int idx;
66 char *header;
67 int header_width;
68};
69
70struct data__file {
71 struct perf_session *session;
72 struct perf_data data;
73 int idx;
74 struct hists *hists;
75 struct diff_hpp_fmt fmt[PERF_HPP_DIFF__MAX_INDEX];
76};
77
78static struct data__file *data__files;
79static int data__files_cnt;
80
81#define data__for_each_file_start(i, d, s) \
82 for (i = s, d = &data__files[s]; \
83 i < data__files_cnt; \
84 i++, d = &data__files[i])
85
86#define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
87#define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
88
89static bool force;
90static bool show_period;
91static bool show_formula;
92static bool show_baseline_only;
93static bool cycles_hist;
94static unsigned int sort_compute = 1;
95
96static s64 compute_wdiff_w1;
97static s64 compute_wdiff_w2;
98
99static const char *cpu_list;
100static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
101
102enum {
103 COMPUTE_DELTA,
104 COMPUTE_RATIO,
105 COMPUTE_WEIGHTED_DIFF,
106 COMPUTE_DELTA_ABS,
107 COMPUTE_CYCLES,
108 COMPUTE_MAX,
109};
110
111const char *compute_names[COMPUTE_MAX] = {
112 [COMPUTE_DELTA] = "delta",
113 [COMPUTE_DELTA_ABS] = "delta-abs",
114 [COMPUTE_RATIO] = "ratio",
115 [COMPUTE_WEIGHTED_DIFF] = "wdiff",
116 [COMPUTE_CYCLES] = "cycles",
117};
118
119static int compute = COMPUTE_DELTA_ABS;
120
121static int compute_2_hpp[COMPUTE_MAX] = {
122 [COMPUTE_DELTA] = PERF_HPP_DIFF__DELTA,
123 [COMPUTE_DELTA_ABS] = PERF_HPP_DIFF__DELTA_ABS,
124 [COMPUTE_RATIO] = PERF_HPP_DIFF__RATIO,
125 [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
126 [COMPUTE_CYCLES] = PERF_HPP_DIFF__CYCLES,
127};
128
129#define MAX_COL_WIDTH 70
130
131static struct header_column {
132 const char *name;
133 int width;
134} columns[PERF_HPP_DIFF__MAX_INDEX] = {
135 [PERF_HPP_DIFF__BASELINE] = {
136 .name = "Baseline",
137 },
138 [PERF_HPP_DIFF__PERIOD] = {
139 .name = "Period",
140 .width = 14,
141 },
142 [PERF_HPP_DIFF__PERIOD_BASELINE] = {
143 .name = "Base period",
144 .width = 14,
145 },
146 [PERF_HPP_DIFF__DELTA] = {
147 .name = "Delta",
148 .width = 7,
149 },
150 [PERF_HPP_DIFF__DELTA_ABS] = {
151 .name = "Delta Abs",
152 .width = 7,
153 },
154 [PERF_HPP_DIFF__RATIO] = {
155 .name = "Ratio",
156 .width = 14,
157 },
158 [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
159 .name = "Weighted diff",
160 .width = 14,
161 },
162 [PERF_HPP_DIFF__FORMULA] = {
163 .name = "Formula",
164 .width = MAX_COL_WIDTH,
165 },
166 [PERF_HPP_DIFF__CYCLES] = {
167 .name = "[Program Block Range] Cycles Diff",
168 .width = 70,
169 },
170 [PERF_HPP_DIFF__CYCLES_HIST] = {
171 .name = "stddev/Hist",
172 .width = NUM_SPARKS + 9,
173 }
174};
175
176static int setup_compute_opt_wdiff(char *opt)
177{
178 char *w1_str = opt;
179 char *w2_str;
180
181 int ret = -EINVAL;
182
183 if (!opt)
184 goto out;
185
186 w2_str = strchr(opt, ',');
187 if (!w2_str)
188 goto out;
189
190 *w2_str++ = 0x0;
191 if (!*w2_str)
192 goto out;
193
194 compute_wdiff_w1 = strtol(w1_str, NULL, 10);
195 compute_wdiff_w2 = strtol(w2_str, NULL, 10);
196
197 if (!compute_wdiff_w1 || !compute_wdiff_w2)
198 goto out;
199
200 pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
201 compute_wdiff_w1, compute_wdiff_w2);
202
203 ret = 0;
204
205 out:
206 if (ret)
207 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
208
209 return ret;
210}
211
212static int setup_compute_opt(char *opt)
213{
214 if (compute == COMPUTE_WEIGHTED_DIFF)
215 return setup_compute_opt_wdiff(opt);
216
217 if (opt) {
218 pr_err("Failed: extra option specified '%s'", opt);
219 return -EINVAL;
220 }
221
222 return 0;
223}
224
225static int setup_compute(const struct option *opt, const char *str,
226 int unset __maybe_unused)
227{
228 int *cp = (int *) opt->value;
229 char *cstr = (char *) str;
230 char buf[50];
231 unsigned i;
232 char *option;
233
234 if (!str) {
235 *cp = COMPUTE_DELTA;
236 return 0;
237 }
238
239 option = strchr(str, ':');
240 if (option) {
241 unsigned len = option++ - str;
242
243 /*
244 * The str data are not writeable, so we need
245 * to use another buffer.
246 */
247
248 /* No option value is longer. */
249 if (len >= sizeof(buf))
250 return -EINVAL;
251
252 strncpy(buf, str, len);
253 buf[len] = 0x0;
254 cstr = buf;
255 }
256
257 for (i = 0; i < COMPUTE_MAX; i++)
258 if (!strcmp(cstr, compute_names[i])) {
259 *cp = i;
260 return setup_compute_opt(option);
261 }
262
263 pr_err("Failed: '%s' is not computation method "
264 "(use 'delta','ratio' or 'wdiff')\n", str);
265 return -EINVAL;
266}
267
268static double period_percent(struct hist_entry *he, u64 period)
269{
270 u64 total = hists__total_period(he->hists);
271
272 return (period * 100.0) / total;
273}
274
275static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
276{
277 double old_percent = period_percent(he, he->stat.period);
278 double new_percent = period_percent(pair, pair->stat.period);
279
280 pair->diff.period_ratio_delta = new_percent - old_percent;
281 pair->diff.computed = true;
282 return pair->diff.period_ratio_delta;
283}
284
285static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
286{
287 double old_period = he->stat.period ?: 1;
288 double new_period = pair->stat.period;
289
290 pair->diff.computed = true;
291 pair->diff.period_ratio = new_period / old_period;
292 return pair->diff.period_ratio;
293}
294
295static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
296{
297 u64 old_period = he->stat.period;
298 u64 new_period = pair->stat.period;
299
300 pair->diff.computed = true;
301 pair->diff.wdiff = new_period * compute_wdiff_w2 -
302 old_period * compute_wdiff_w1;
303
304 return pair->diff.wdiff;
305}
306
307static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
308 char *buf, size_t size)
309{
310 u64 he_total = he->hists->stats.total_period;
311 u64 pair_total = pair->hists->stats.total_period;
312
313 if (symbol_conf.filter_relative) {
314 he_total = he->hists->stats.total_non_filtered_period;
315 pair_total = pair->hists->stats.total_non_filtered_period;
316 }
317 return scnprintf(buf, size,
318 "(%" PRIu64 " * 100 / %" PRIu64 ") - "
319 "(%" PRIu64 " * 100 / %" PRIu64 ")",
320 pair->stat.period, pair_total,
321 he->stat.period, he_total);
322}
323
324static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
325 char *buf, size_t size)
326{
327 double old_period = he->stat.period;
328 double new_period = pair->stat.period;
329
330 return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
331}
332
333static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
334 char *buf, size_t size)
335{
336 u64 old_period = he->stat.period;
337 u64 new_period = pair->stat.period;
338
339 return scnprintf(buf, size,
340 "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
341 new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
342}
343
344static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
345 char *buf, size_t size)
346{
347 switch (compute) {
348 case COMPUTE_DELTA:
349 case COMPUTE_DELTA_ABS:
350 return formula_delta(he, pair, buf, size);
351 case COMPUTE_RATIO:
352 return formula_ratio(he, pair, buf, size);
353 case COMPUTE_WEIGHTED_DIFF:
354 return formula_wdiff(he, pair, buf, size);
355 default:
356 BUG_ON(1);
357 }
358
359 return -1;
360}
361
362static void *block_hist_zalloc(size_t size)
363{
364 struct block_hist *bh;
365
366 bh = zalloc(size + sizeof(*bh));
367 if (!bh)
368 return NULL;
369
370 return &bh->he;
371}
372
373static void block_hist_free(void *he)
374{
375 struct block_hist *bh;
376
377 bh = container_of(he, struct block_hist, he);
378 hists__delete_entries(&bh->block_hists);
379 free(bh);
380}
381
382struct hist_entry_ops block_hist_ops = {
383 .new = block_hist_zalloc,
384 .free = block_hist_free,
385};
386
387static int diff__process_sample_event(struct perf_tool *tool,
388 union perf_event *event,
389 struct perf_sample *sample,
390 struct evsel *evsel,
391 struct machine *machine)
392{
393 struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
394 struct addr_location al;
395 struct hists *hists = evsel__hists(evsel);
396 int ret = -1;
397
398 if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
399 sample->time)) {
400 return 0;
401 }
402
403 if (machine__resolve(machine, &al, sample) < 0) {
404 pr_warning("problem processing %d event, skipping it.\n",
405 event->header.type);
406 return -1;
407 }
408
409 if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
410 ret = 0;
411 goto out_put;
412 }
413
414 if (compute != COMPUTE_CYCLES) {
415 if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
416 true)) {
417 pr_warning("problem incrementing symbol period, "
418 "skipping event\n");
419 goto out_put;
420 }
421 } else {
422 if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
423 NULL, NULL, sample, true)) {
424 pr_warning("problem incrementing symbol period, "
425 "skipping event\n");
426 goto out_put;
427 }
428
429 hist__account_cycles(sample->branch_stack, &al, sample, false,
430 NULL);
431 }
432
433 /*
434 * The total_period is updated here before going to the output
435 * tree since normally only the baseline hists will call
436 * hists__output_resort() and precompute needs the total
437 * period in order to sort entries by percentage delta.
438 */
439 hists->stats.total_period += sample->period;
440 if (!al.filtered)
441 hists->stats.total_non_filtered_period += sample->period;
442 ret = 0;
443out_put:
444 addr_location__put(&al);
445 return ret;
446}
447
448static struct perf_diff pdiff = {
449 .tool = {
450 .sample = diff__process_sample_event,
451 .mmap = perf_event__process_mmap,
452 .mmap2 = perf_event__process_mmap2,
453 .comm = perf_event__process_comm,
454 .exit = perf_event__process_exit,
455 .fork = perf_event__process_fork,
456 .lost = perf_event__process_lost,
457 .namespaces = perf_event__process_namespaces,
458 .cgroup = perf_event__process_cgroup,
459 .ordered_events = true,
460 .ordering_requires_timestamps = true,
461 },
462};
463
464static struct evsel *evsel_match(struct evsel *evsel,
465 struct evlist *evlist)
466{
467 struct evsel *e;
468
469 evlist__for_each_entry(evlist, e) {
470 if (evsel__match2(evsel, e))
471 return e;
472 }
473
474 return NULL;
475}
476
477static void perf_evlist__collapse_resort(struct evlist *evlist)
478{
479 struct evsel *evsel;
480
481 evlist__for_each_entry(evlist, evsel) {
482 struct hists *hists = evsel__hists(evsel);
483
484 hists__collapse_resort(hists, NULL);
485 }
486}
487
488static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
489{
490 struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
491 void *ptr = dfmt - dfmt->idx;
492 struct data__file *d = container_of(ptr, struct data__file, fmt);
493
494 return d;
495}
496
497static struct hist_entry*
498get_pair_data(struct hist_entry *he, struct data__file *d)
499{
500 if (hist_entry__has_pairs(he)) {
501 struct hist_entry *pair;
502
503 list_for_each_entry(pair, &he->pairs.head, pairs.node)
504 if (pair->hists == d->hists)
505 return pair;
506 }
507
508 return NULL;
509}
510
511static struct hist_entry*
512get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
513{
514 struct data__file *d = fmt_to_data_file(&dfmt->fmt);
515
516 return get_pair_data(he, d);
517}
518
519static void hists__baseline_only(struct hists *hists)
520{
521 struct rb_root_cached *root;
522 struct rb_node *next;
523
524 if (hists__has(hists, need_collapse))
525 root = &hists->entries_collapsed;
526 else
527 root = hists->entries_in;
528
529 next = rb_first_cached(root);
530 while (next != NULL) {
531 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
532
533 next = rb_next(&he->rb_node_in);
534 if (!hist_entry__next_pair(he)) {
535 rb_erase_cached(&he->rb_node_in, root);
536 hist_entry__delete(he);
537 }
538 }
539}
540
541static int64_t block_cycles_diff_cmp(struct hist_entry *left,
542 struct hist_entry *right)
543{
544 bool pairs_left = hist_entry__has_pairs(left);
545 bool pairs_right = hist_entry__has_pairs(right);
546 s64 l, r;
547
548 if (!pairs_left && !pairs_right)
549 return 0;
550
551 l = llabs(left->diff.cycles);
552 r = llabs(right->diff.cycles);
553 return r - l;
554}
555
556static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
557 struct hist_entry *left, struct hist_entry *right)
558{
559 return block_cycles_diff_cmp(right, left);
560}
561
562static void init_block_hist(struct block_hist *bh)
563{
564 __hists__init(&bh->block_hists, &bh->block_list);
565 perf_hpp_list__init(&bh->block_list);
566
567 INIT_LIST_HEAD(&bh->block_fmt.list);
568 INIT_LIST_HEAD(&bh->block_fmt.sort_list);
569 bh->block_fmt.cmp = block_info__cmp;
570 bh->block_fmt.sort = block_sort;
571 perf_hpp_list__register_sort_field(&bh->block_list,
572 &bh->block_fmt);
573 bh->valid = true;
574}
575
576static struct hist_entry *get_block_pair(struct hist_entry *he,
577 struct hists *hists_pair)
578{
579 struct rb_root_cached *root = hists_pair->entries_in;
580 struct rb_node *next = rb_first_cached(root);
581 int64_t cmp;
582
583 while (next != NULL) {
584 struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
585 rb_node_in);
586
587 next = rb_next(&he_pair->rb_node_in);
588
589 cmp = __block_info__cmp(he_pair, he);
590 if (!cmp)
591 return he_pair;
592 }
593
594 return NULL;
595}
596
597static void init_spark_values(unsigned long *svals, int num)
598{
599 for (int i = 0; i < num; i++)
600 svals[i] = 0;
601}
602
603static void update_spark_value(unsigned long *svals, int num,
604 struct stats *stats, u64 val)
605{
606 int n = stats->n;
607
608 if (n < num)
609 svals[n] = val;
610}
611
612static void compute_cycles_diff(struct hist_entry *he,
613 struct hist_entry *pair)
614{
615 pair->diff.computed = true;
616 if (pair->block_info->num && he->block_info->num) {
617 pair->diff.cycles =
618 pair->block_info->cycles_aggr / pair->block_info->num_aggr -
619 he->block_info->cycles_aggr / he->block_info->num_aggr;
620
621 if (!cycles_hist)
622 return;
623
624 init_stats(&pair->diff.stats);
625 init_spark_values(pair->diff.svals, NUM_SPARKS);
626
627 for (int i = 0; i < pair->block_info->num; i++) {
628 u64 val;
629
630 if (i >= he->block_info->num || i >= NUM_SPARKS)
631 break;
632
633 val = llabs(pair->block_info->cycles_spark[i] -
634 he->block_info->cycles_spark[i]);
635
636 update_spark_value(pair->diff.svals, NUM_SPARKS,
637 &pair->diff.stats, val);
638 update_stats(&pair->diff.stats, val);
639 }
640 }
641}
642
643static void block_hists_match(struct hists *hists_base,
644 struct hists *hists_pair)
645{
646 struct rb_root_cached *root = hists_base->entries_in;
647 struct rb_node *next = rb_first_cached(root);
648
649 while (next != NULL) {
650 struct hist_entry *he = rb_entry(next, struct hist_entry,
651 rb_node_in);
652 struct hist_entry *pair = get_block_pair(he, hists_pair);
653
654 next = rb_next(&he->rb_node_in);
655
656 if (pair) {
657 hist_entry__add_pair(pair, he);
658 compute_cycles_diff(he, pair);
659 }
660 }
661}
662
663static void hists__precompute(struct hists *hists)
664{
665 struct rb_root_cached *root;
666 struct rb_node *next;
667
668 if (hists__has(hists, need_collapse))
669 root = &hists->entries_collapsed;
670 else
671 root = hists->entries_in;
672
673 next = rb_first_cached(root);
674 while (next != NULL) {
675 struct block_hist *bh, *pair_bh;
676 struct hist_entry *he, *pair;
677 struct data__file *d;
678 int i;
679
680 he = rb_entry(next, struct hist_entry, rb_node_in);
681 next = rb_next(&he->rb_node_in);
682
683 if (compute == COMPUTE_CYCLES) {
684 bh = container_of(he, struct block_hist, he);
685 init_block_hist(bh);
686 block_info__process_sym(he, bh, NULL, 0);
687 }
688
689 data__for_each_file_new(i, d) {
690 pair = get_pair_data(he, d);
691 if (!pair)
692 continue;
693
694 switch (compute) {
695 case COMPUTE_DELTA:
696 case COMPUTE_DELTA_ABS:
697 compute_delta(he, pair);
698 break;
699 case COMPUTE_RATIO:
700 compute_ratio(he, pair);
701 break;
702 case COMPUTE_WEIGHTED_DIFF:
703 compute_wdiff(he, pair);
704 break;
705 case COMPUTE_CYCLES:
706 pair_bh = container_of(pair, struct block_hist,
707 he);
708 init_block_hist(pair_bh);
709 block_info__process_sym(pair, pair_bh, NULL, 0);
710
711 bh = container_of(he, struct block_hist, he);
712
713 if (bh->valid && pair_bh->valid) {
714 block_hists_match(&bh->block_hists,
715 &pair_bh->block_hists);
716 hists__output_resort(&pair_bh->block_hists,
717 NULL);
718 }
719 break;
720 default:
721 BUG_ON(1);
722 }
723 }
724 }
725}
726
727static int64_t cmp_doubles(double l, double r)
728{
729 if (l > r)
730 return -1;
731 else if (l < r)
732 return 1;
733 else
734 return 0;
735}
736
737static int64_t
738__hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
739 int c)
740{
741 switch (c) {
742 case COMPUTE_DELTA:
743 {
744 double l = left->diff.period_ratio_delta;
745 double r = right->diff.period_ratio_delta;
746
747 return cmp_doubles(l, r);
748 }
749 case COMPUTE_DELTA_ABS:
750 {
751 double l = fabs(left->diff.period_ratio_delta);
752 double r = fabs(right->diff.period_ratio_delta);
753
754 return cmp_doubles(l, r);
755 }
756 case COMPUTE_RATIO:
757 {
758 double l = left->diff.period_ratio;
759 double r = right->diff.period_ratio;
760
761 return cmp_doubles(l, r);
762 }
763 case COMPUTE_WEIGHTED_DIFF:
764 {
765 s64 l = left->diff.wdiff;
766 s64 r = right->diff.wdiff;
767
768 return r - l;
769 }
770 default:
771 BUG_ON(1);
772 }
773
774 return 0;
775}
776
777static int64_t
778hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
779 int c, int sort_idx)
780{
781 bool pairs_left = hist_entry__has_pairs(left);
782 bool pairs_right = hist_entry__has_pairs(right);
783 struct hist_entry *p_right, *p_left;
784
785 if (!pairs_left && !pairs_right)
786 return 0;
787
788 if (!pairs_left || !pairs_right)
789 return pairs_left ? -1 : 1;
790
791 p_left = get_pair_data(left, &data__files[sort_idx]);
792 p_right = get_pair_data(right, &data__files[sort_idx]);
793
794 if (!p_left && !p_right)
795 return 0;
796
797 if (!p_left || !p_right)
798 return p_left ? -1 : 1;
799
800 /*
801 * We have 2 entries of same kind, let's
802 * make the data comparison.
803 */
804 return __hist_entry__cmp_compute(p_left, p_right, c);
805}
806
807static int64_t
808hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
809 int c, int sort_idx)
810{
811 struct hist_entry *p_right, *p_left;
812
813 p_left = get_pair_data(left, &data__files[sort_idx]);
814 p_right = get_pair_data(right, &data__files[sort_idx]);
815
816 if (!p_left && !p_right)
817 return 0;
818
819 if (!p_left || !p_right)
820 return p_left ? -1 : 1;
821
822 if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
823 /*
824 * The delta can be computed without the baseline, but
825 * others are not. Put those entries which have no
826 * values below.
827 */
828 if (left->dummy && right->dummy)
829 return 0;
830
831 if (left->dummy || right->dummy)
832 return left->dummy ? 1 : -1;
833 }
834
835 return __hist_entry__cmp_compute(p_left, p_right, c);
836}
837
838static int64_t
839hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
840 struct hist_entry *left __maybe_unused,
841 struct hist_entry *right __maybe_unused)
842{
843 return 0;
844}
845
846static int64_t
847hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
848 struct hist_entry *left, struct hist_entry *right)
849{
850 if (left->stat.period == right->stat.period)
851 return 0;
852 return left->stat.period > right->stat.period ? 1 : -1;
853}
854
855static int64_t
856hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
857 struct hist_entry *left, struct hist_entry *right)
858{
859 struct data__file *d = fmt_to_data_file(fmt);
860
861 return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
862}
863
864static int64_t
865hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
866 struct hist_entry *left, struct hist_entry *right)
867{
868 struct data__file *d = fmt_to_data_file(fmt);
869
870 return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
871}
872
873static int64_t
874hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
875 struct hist_entry *left, struct hist_entry *right)
876{
877 struct data__file *d = fmt_to_data_file(fmt);
878
879 return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
880}
881
882static int64_t
883hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
884 struct hist_entry *left, struct hist_entry *right)
885{
886 struct data__file *d = fmt_to_data_file(fmt);
887
888 return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
889}
890
891static int64_t
892hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
893 struct hist_entry *left, struct hist_entry *right)
894{
895 return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
896 sort_compute);
897}
898
899static int64_t
900hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
901 struct hist_entry *left, struct hist_entry *right)
902{
903 return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
904 sort_compute);
905}
906
907static int64_t
908hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
909 struct hist_entry *left, struct hist_entry *right)
910{
911 return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
912 sort_compute);
913}
914
915static int64_t
916hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
917 struct hist_entry *left, struct hist_entry *right)
918{
919 return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
920 sort_compute);
921}
922
923static void hists__process(struct hists *hists)
924{
925 if (show_baseline_only)
926 hists__baseline_only(hists);
927
928 hists__precompute(hists);
929 hists__output_resort(hists, NULL);
930
931 if (compute == COMPUTE_CYCLES)
932 symbol_conf.report_block = true;
933
934 hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
935 !symbol_conf.use_callchain);
936}
937
938static void data__fprintf(void)
939{
940 struct data__file *d;
941 int i;
942
943 fprintf(stdout, "# Data files:\n");
944
945 data__for_each_file(i, d)
946 fprintf(stdout, "# [%d] %s %s\n",
947 d->idx, d->data.path,
948 !d->idx ? "(Baseline)" : "");
949
950 fprintf(stdout, "#\n");
951}
952
953static void data_process(void)
954{
955 struct evlist *evlist_base = data__files[0].session->evlist;
956 struct evsel *evsel_base;
957 bool first = true;
958
959 evlist__for_each_entry(evlist_base, evsel_base) {
960 struct hists *hists_base = evsel__hists(evsel_base);
961 struct data__file *d;
962 int i;
963
964 data__for_each_file_new(i, d) {
965 struct evlist *evlist = d->session->evlist;
966 struct evsel *evsel;
967 struct hists *hists;
968
969 evsel = evsel_match(evsel_base, evlist);
970 if (!evsel)
971 continue;
972
973 hists = evsel__hists(evsel);
974 d->hists = hists;
975
976 hists__match(hists_base, hists);
977
978 if (!show_baseline_only)
979 hists__link(hists_base, hists);
980 }
981
982 if (!quiet) {
983 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
984 evsel__name(evsel_base));
985 }
986
987 first = false;
988
989 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
990 data__fprintf();
991
992 /* Don't sort callchain for perf diff */
993 evsel__reset_sample_bit(evsel_base, CALLCHAIN);
994
995 hists__process(hists_base);
996 }
997}
998
999static void data__free(struct data__file *d)
1000{
1001 int col;
1002
1003 for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1004 struct diff_hpp_fmt *fmt = &d->fmt[col];
1005
1006 zfree(&fmt->header);
1007 }
1008}
1009
1010static int abstime_str_dup(char **pstr)
1011{
1012 char *str = NULL;
1013
1014 if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1015 str = strdup(pdiff.time_str);
1016 if (!str)
1017 return -ENOMEM;
1018 }
1019
1020 *pstr = str;
1021 return 0;
1022}
1023
1024static int parse_absolute_time(struct data__file *d, char **pstr)
1025{
1026 char *p = *pstr;
1027 int ret;
1028
1029 /*
1030 * Absolute timestamp for one file has the format: a.b,c.d
1031 * For multiple files, the format is: a.b,c.d:a.b,c.d
1032 */
1033 p = strchr(*pstr, ':');
1034 if (p) {
1035 if (p == *pstr) {
1036 pr_err("Invalid time string\n");
1037 return -EINVAL;
1038 }
1039
1040 *p = 0;
1041 p++;
1042 if (*p == 0) {
1043 pr_err("Invalid time string\n");
1044 return -EINVAL;
1045 }
1046 }
1047
1048 ret = perf_time__parse_for_ranges(*pstr, d->session,
1049 &pdiff.ptime_range,
1050 &pdiff.range_size,
1051 &pdiff.range_num);
1052 if (ret < 0)
1053 return ret;
1054
1055 if (!p || *p == 0)
1056 *pstr = NULL;
1057 else
1058 *pstr = p;
1059
1060 return ret;
1061}
1062
1063static int parse_percent_time(struct data__file *d)
1064{
1065 int ret;
1066
1067 ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1068 &pdiff.ptime_range,
1069 &pdiff.range_size,
1070 &pdiff.range_num);
1071 return ret;
1072}
1073
1074static int parse_time_str(struct data__file *d, char *abstime_ostr,
1075 char **pabstime_tmp)
1076{
1077 int ret = 0;
1078
1079 if (abstime_ostr)
1080 ret = parse_absolute_time(d, pabstime_tmp);
1081 else if (pdiff.time_str)
1082 ret = parse_percent_time(d);
1083
1084 return ret;
1085}
1086
1087static int check_file_brstack(void)
1088{
1089 struct data__file *d;
1090 bool has_br_stack;
1091 int i;
1092
1093 data__for_each_file(i, d) {
1094 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1095 if (IS_ERR(d->session)) {
1096 pr_err("Failed to open %s\n", d->data.path);
1097 return PTR_ERR(d->session);
1098 }
1099
1100 has_br_stack = perf_header__has_feat(&d->session->header,
1101 HEADER_BRANCH_STACK);
1102 perf_session__delete(d->session);
1103 if (!has_br_stack)
1104 return 0;
1105 }
1106
1107 /* Set only all files having branch stacks */
1108 pdiff.has_br_stack = true;
1109 return 0;
1110}
1111
1112static int __cmd_diff(void)
1113{
1114 struct data__file *d;
1115 int ret, i;
1116 char *abstime_ostr, *abstime_tmp;
1117
1118 ret = abstime_str_dup(&abstime_ostr);
1119 if (ret)
1120 return ret;
1121
1122 abstime_tmp = abstime_ostr;
1123 ret = -EINVAL;
1124
1125 data__for_each_file(i, d) {
1126 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1127 if (IS_ERR(d->session)) {
1128 ret = PTR_ERR(d->session);
1129 pr_err("Failed to open %s\n", d->data.path);
1130 goto out_delete;
1131 }
1132
1133 if (pdiff.time_str) {
1134 ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1135 if (ret < 0)
1136 goto out_delete;
1137 }
1138
1139 if (cpu_list) {
1140 ret = perf_session__cpu_bitmap(d->session, cpu_list,
1141 cpu_bitmap);
1142 if (ret < 0)
1143 goto out_delete;
1144 }
1145
1146 ret = perf_session__process_events(d->session);
1147 if (ret) {
1148 pr_err("Failed to process %s\n", d->data.path);
1149 goto out_delete;
1150 }
1151
1152 perf_evlist__collapse_resort(d->session->evlist);
1153
1154 if (pdiff.ptime_range)
1155 zfree(&pdiff.ptime_range);
1156 }
1157
1158 data_process();
1159
1160 out_delete:
1161 data__for_each_file(i, d) {
1162 perf_session__delete(d->session);
1163 data__free(d);
1164 }
1165
1166 free(data__files);
1167
1168 if (pdiff.ptime_range)
1169 zfree(&pdiff.ptime_range);
1170
1171 if (abstime_ostr)
1172 free(abstime_ostr);
1173
1174 return ret;
1175}
1176
1177static const char * const diff_usage[] = {
1178 "perf diff [<options>] [old_file] [new_file]",
1179 NULL,
1180};
1181
1182static const struct option options[] = {
1183 OPT_INCR('v', "verbose", &verbose,
1184 "be more verbose (show symbol address, etc)"),
1185 OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
1186 OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1187 "Show only items with match in baseline"),
1188 OPT_CALLBACK('c', "compute", &compute,
1189 "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1190 "Entries differential computation selection",
1191 setup_compute),
1192 OPT_BOOLEAN('p', "period", &show_period,
1193 "Show period values."),
1194 OPT_BOOLEAN('F', "formula", &show_formula,
1195 "Show formula."),
1196 OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1197 "Show cycles histogram and standard deviation "
1198 "- WARNING: use only with -c cycles."),
1199 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1200 "dump raw trace in ASCII"),
1201 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1202 OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1203 "file", "kallsyms pathname"),
1204 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1205 "load module symbols - WARNING: use only with -k and LIVE kernel"),
1206 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1207 "only consider symbols in these dsos"),
1208 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1209 "only consider symbols in these comms"),
1210 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1211 "only consider these symbols"),
1212 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1213 "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1214 " Please refer the man page for the complete list."),
1215 OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1216 "separator for columns, no spaces will be added between "
1217 "columns '.' is reserved."),
1218 OPT_CALLBACK(0, "symfs", NULL, "directory",
1219 "Look for files with symbols relative to this directory",
1220 symbol__config_symfs),
1221 OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1222 OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1223 "How to display percentage of filtered entries", parse_filter_percentage),
1224 OPT_STRING(0, "time", &pdiff.time_str, "str",
1225 "Time span (time percent or absolute timestamp)"),
1226 OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1227 OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1228 "only consider symbols in these pids"),
1229 OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1230 "only consider symbols in these tids"),
1231 OPT_END()
1232};
1233
1234static double baseline_percent(struct hist_entry *he)
1235{
1236 u64 total = hists__total_period(he->hists);
1237
1238 return 100.0 * he->stat.period / total;
1239}
1240
1241static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1242 struct perf_hpp *hpp, struct hist_entry *he)
1243{
1244 struct diff_hpp_fmt *dfmt =
1245 container_of(fmt, struct diff_hpp_fmt, fmt);
1246 double percent = baseline_percent(he);
1247 char pfmt[20] = " ";
1248
1249 if (!he->dummy) {
1250 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1251 return percent_color_snprintf(hpp->buf, hpp->size,
1252 pfmt, percent);
1253 } else
1254 return scnprintf(hpp->buf, hpp->size, "%*s",
1255 dfmt->header_width, pfmt);
1256}
1257
1258static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1259{
1260 double percent = baseline_percent(he);
1261 const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1262 int ret = 0;
1263
1264 if (!he->dummy)
1265 ret = scnprintf(buf, size, fmt, percent);
1266
1267 return ret;
1268}
1269
1270static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1271 struct perf_hpp *hpp, int width)
1272{
1273 struct block_hist *bh = container_of(he, struct block_hist, he);
1274 struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1275 struct hist_entry *block_he;
1276 struct block_info *bi;
1277 char buf[128];
1278 char *start_line, *end_line;
1279
1280 block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1281 if (!block_he) {
1282 hpp->skip = true;
1283 return 0;
1284 }
1285
1286 /*
1287 * Avoid printing the warning "addr2line_init failed for ..."
1288 */
1289 symbol_conf.disable_add2line_warn = true;
1290
1291 bi = block_he->block_info;
1292
1293 start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1294 he->ms.sym);
1295
1296 end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1297 he->ms.sym);
1298
1299 if ((strncmp(start_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0) &&
1300 (strncmp(end_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)) {
1301 scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1302 start_line, end_line, block_he->diff.cycles);
1303 } else {
1304 scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1305 bi->start, bi->end, block_he->diff.cycles);
1306 }
1307
1308 free_srcline(start_line);
1309 free_srcline(end_line);
1310
1311 return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1312}
1313
1314static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1315 struct perf_hpp *hpp, struct hist_entry *he,
1316 int comparison_method)
1317{
1318 struct diff_hpp_fmt *dfmt =
1319 container_of(fmt, struct diff_hpp_fmt, fmt);
1320 struct hist_entry *pair = get_pair_fmt(he, dfmt);
1321 double diff;
1322 s64 wdiff;
1323 char pfmt[20] = " ";
1324
1325 if (!pair) {
1326 if (comparison_method == COMPUTE_CYCLES) {
1327 struct block_hist *bh;
1328
1329 bh = container_of(he, struct block_hist, he);
1330 if (bh->block_idx)
1331 hpp->skip = true;
1332 }
1333
1334 goto no_print;
1335 }
1336
1337 switch (comparison_method) {
1338 case COMPUTE_DELTA:
1339 if (pair->diff.computed)
1340 diff = pair->diff.period_ratio_delta;
1341 else
1342 diff = compute_delta(he, pair);
1343
1344 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1345 return percent_color_snprintf(hpp->buf, hpp->size,
1346 pfmt, diff);
1347 case COMPUTE_RATIO:
1348 if (he->dummy)
1349 goto dummy_print;
1350 if (pair->diff.computed)
1351 diff = pair->diff.period_ratio;
1352 else
1353 diff = compute_ratio(he, pair);
1354
1355 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1356 return value_color_snprintf(hpp->buf, hpp->size,
1357 pfmt, diff);
1358 case COMPUTE_WEIGHTED_DIFF:
1359 if (he->dummy)
1360 goto dummy_print;
1361 if (pair->diff.computed)
1362 wdiff = pair->diff.wdiff;
1363 else
1364 wdiff = compute_wdiff(he, pair);
1365
1366 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1367 return color_snprintf(hpp->buf, hpp->size,
1368 get_percent_color(wdiff),
1369 pfmt, wdiff);
1370 case COMPUTE_CYCLES:
1371 return cycles_printf(he, pair, hpp, dfmt->header_width);
1372 default:
1373 BUG_ON(1);
1374 }
1375dummy_print:
1376 return scnprintf(hpp->buf, hpp->size, "%*s",
1377 dfmt->header_width, "N/A");
1378no_print:
1379 return scnprintf(hpp->buf, hpp->size, "%*s",
1380 dfmt->header_width, pfmt);
1381}
1382
1383static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1384 struct perf_hpp *hpp, struct hist_entry *he)
1385{
1386 return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1387}
1388
1389static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1390 struct perf_hpp *hpp, struct hist_entry *he)
1391{
1392 return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1393}
1394
1395static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1396 struct perf_hpp *hpp, struct hist_entry *he)
1397{
1398 return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1399}
1400
1401static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1402 struct perf_hpp *hpp, struct hist_entry *he)
1403{
1404 return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1405}
1406
1407static int all_zero(unsigned long *vals, int len)
1408{
1409 int i;
1410
1411 for (i = 0; i < len; i++)
1412 if (vals[i] != 0)
1413 return 0;
1414 return 1;
1415}
1416
1417static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1418{
1419 int printed;
1420
1421 if (n <= 1)
1422 return 0;
1423
1424 if (n > NUM_SPARKS)
1425 n = NUM_SPARKS;
1426 if (all_zero(svals, n))
1427 return 0;
1428
1429 printed = print_spark(bf, size, svals, n);
1430 printed += scnprintf(bf + printed, size - printed, " ");
1431 return printed;
1432}
1433
1434static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1435 struct perf_hpp *hpp, struct hist_entry *he)
1436{
1437 struct diff_hpp_fmt *dfmt =
1438 container_of(fmt, struct diff_hpp_fmt, fmt);
1439 struct hist_entry *pair = get_pair_fmt(he, dfmt);
1440 struct block_hist *bh = container_of(he, struct block_hist, he);
1441 struct block_hist *bh_pair;
1442 struct hist_entry *block_he;
1443 char spark[32], buf[128];
1444 double r;
1445 int ret, pad;
1446
1447 if (!pair) {
1448 if (bh->block_idx)
1449 hpp->skip = true;
1450
1451 goto no_print;
1452 }
1453
1454 bh_pair = container_of(pair, struct block_hist, he);
1455
1456 block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1457 if (!block_he) {
1458 hpp->skip = true;
1459 goto no_print;
1460 }
1461
1462 ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1463 block_he->diff.stats.n);
1464
1465 r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1466 avg_stats(&block_he->diff.stats));
1467
1468 if (ret) {
1469 /*
1470 * Padding spaces if number of sparks less than NUM_SPARKS
1471 * otherwise the output is not aligned.
1472 */
1473 pad = NUM_SPARKS - ((ret - 1) / 3);
1474 scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1475 ret = scnprintf(hpp->buf, hpp->size, "%*s",
1476 dfmt->header_width, buf);
1477
1478 if (pad) {
1479 ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1480 "%-*s", pad, " ");
1481 }
1482
1483 return ret;
1484 }
1485
1486no_print:
1487 return scnprintf(hpp->buf, hpp->size, "%*s",
1488 dfmt->header_width, " ");
1489}
1490
1491static void
1492hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1493{
1494 switch (idx) {
1495 case PERF_HPP_DIFF__PERIOD_BASELINE:
1496 scnprintf(buf, size, "%" PRIu64, he->stat.period);
1497 break;
1498
1499 default:
1500 break;
1501 }
1502}
1503
1504static void
1505hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1506 int idx, char *buf, size_t size)
1507{
1508 double diff;
1509 double ratio;
1510 s64 wdiff;
1511
1512 switch (idx) {
1513 case PERF_HPP_DIFF__DELTA:
1514 case PERF_HPP_DIFF__DELTA_ABS:
1515 if (pair->diff.computed)
1516 diff = pair->diff.period_ratio_delta;
1517 else
1518 diff = compute_delta(he, pair);
1519
1520 scnprintf(buf, size, "%+4.2F%%", diff);
1521 break;
1522
1523 case PERF_HPP_DIFF__RATIO:
1524 /* No point for ratio number if we are dummy.. */
1525 if (he->dummy) {
1526 scnprintf(buf, size, "N/A");
1527 break;
1528 }
1529
1530 if (pair->diff.computed)
1531 ratio = pair->diff.period_ratio;
1532 else
1533 ratio = compute_ratio(he, pair);
1534
1535 if (ratio > 0.0)
1536 scnprintf(buf, size, "%14.6F", ratio);
1537 break;
1538
1539 case PERF_HPP_DIFF__WEIGHTED_DIFF:
1540 /* No point for wdiff number if we are dummy.. */
1541 if (he->dummy) {
1542 scnprintf(buf, size, "N/A");
1543 break;
1544 }
1545
1546 if (pair->diff.computed)
1547 wdiff = pair->diff.wdiff;
1548 else
1549 wdiff = compute_wdiff(he, pair);
1550
1551 if (wdiff != 0)
1552 scnprintf(buf, size, "%14ld", wdiff);
1553 break;
1554
1555 case PERF_HPP_DIFF__FORMULA:
1556 formula_fprintf(he, pair, buf, size);
1557 break;
1558
1559 case PERF_HPP_DIFF__PERIOD:
1560 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1561 break;
1562
1563 default:
1564 BUG_ON(1);
1565 }
1566}
1567
1568static void
1569__hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1570 char *buf, size_t size)
1571{
1572 struct hist_entry *pair = get_pair_fmt(he, dfmt);
1573 int idx = dfmt->idx;
1574
1575 /* baseline is special */
1576 if (idx == PERF_HPP_DIFF__BASELINE)
1577 hpp__entry_baseline(he, buf, size);
1578 else {
1579 if (pair)
1580 hpp__entry_pair(he, pair, idx, buf, size);
1581 else
1582 hpp__entry_unpair(he, idx, buf, size);
1583 }
1584}
1585
1586static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1587 struct hist_entry *he)
1588{
1589 struct diff_hpp_fmt *dfmt =
1590 container_of(_fmt, struct diff_hpp_fmt, fmt);
1591 char buf[MAX_COL_WIDTH] = " ";
1592
1593 __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1594
1595 if (symbol_conf.field_sep)
1596 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1597 else
1598 return scnprintf(hpp->buf, hpp->size, "%*s",
1599 dfmt->header_width, buf);
1600}
1601
1602static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1603 struct hists *hists __maybe_unused,
1604 int line __maybe_unused,
1605 int *span __maybe_unused)
1606{
1607 struct diff_hpp_fmt *dfmt =
1608 container_of(fmt, struct diff_hpp_fmt, fmt);
1609
1610 BUG_ON(!dfmt->header);
1611 return scnprintf(hpp->buf, hpp->size, dfmt->header);
1612}
1613
1614static int hpp__width(struct perf_hpp_fmt *fmt,
1615 struct perf_hpp *hpp __maybe_unused,
1616 struct hists *hists __maybe_unused)
1617{
1618 struct diff_hpp_fmt *dfmt =
1619 container_of(fmt, struct diff_hpp_fmt, fmt);
1620
1621 BUG_ON(dfmt->header_width <= 0);
1622 return dfmt->header_width;
1623}
1624
1625static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1626{
1627#define MAX_HEADER_NAME 100
1628 char buf_indent[MAX_HEADER_NAME];
1629 char buf[MAX_HEADER_NAME];
1630 const char *header = NULL;
1631 int width = 0;
1632
1633 BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1634 header = columns[dfmt->idx].name;
1635 width = columns[dfmt->idx].width;
1636
1637 /* Only our defined HPP fmts should appear here. */
1638 BUG_ON(!header);
1639
1640 if (data__files_cnt > 2)
1641 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1642
1643#define NAME (data__files_cnt > 2 ? buf : header)
1644 dfmt->header_width = width;
1645 width = (int) strlen(NAME);
1646 if (dfmt->header_width < width)
1647 dfmt->header_width = width;
1648
1649 scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1650 dfmt->header_width, NAME);
1651
1652 dfmt->header = strdup(buf_indent);
1653#undef MAX_HEADER_NAME
1654#undef NAME
1655}
1656
1657static void data__hpp_register(struct data__file *d, int idx)
1658{
1659 struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1660 struct perf_hpp_fmt *fmt = &dfmt->fmt;
1661
1662 dfmt->idx = idx;
1663
1664 fmt->header = hpp__header;
1665 fmt->width = hpp__width;
1666 fmt->entry = hpp__entry_global;
1667 fmt->cmp = hist_entry__cmp_nop;
1668 fmt->collapse = hist_entry__cmp_nop;
1669
1670 /* TODO more colors */
1671 switch (idx) {
1672 case PERF_HPP_DIFF__BASELINE:
1673 fmt->color = hpp__color_baseline;
1674 fmt->sort = hist_entry__cmp_baseline;
1675 break;
1676 case PERF_HPP_DIFF__DELTA:
1677 fmt->color = hpp__color_delta;
1678 fmt->sort = hist_entry__cmp_delta;
1679 break;
1680 case PERF_HPP_DIFF__RATIO:
1681 fmt->color = hpp__color_ratio;
1682 fmt->sort = hist_entry__cmp_ratio;
1683 break;
1684 case PERF_HPP_DIFF__WEIGHTED_DIFF:
1685 fmt->color = hpp__color_wdiff;
1686 fmt->sort = hist_entry__cmp_wdiff;
1687 break;
1688 case PERF_HPP_DIFF__DELTA_ABS:
1689 fmt->color = hpp__color_delta;
1690 fmt->sort = hist_entry__cmp_delta_abs;
1691 break;
1692 case PERF_HPP_DIFF__CYCLES:
1693 fmt->color = hpp__color_cycles;
1694 fmt->sort = hist_entry__cmp_nop;
1695 break;
1696 case PERF_HPP_DIFF__CYCLES_HIST:
1697 fmt->color = hpp__color_cycles_hist;
1698 fmt->sort = hist_entry__cmp_nop;
1699 break;
1700 default:
1701 fmt->sort = hist_entry__cmp_nop;
1702 break;
1703 }
1704
1705 init_header(d, dfmt);
1706 perf_hpp__column_register(fmt);
1707 perf_hpp__register_sort_field(fmt);
1708}
1709
1710static int ui_init(void)
1711{
1712 struct data__file *d;
1713 struct perf_hpp_fmt *fmt;
1714 int i;
1715
1716 data__for_each_file(i, d) {
1717
1718 /*
1719 * Baseline or compute realted columns:
1720 *
1721 * PERF_HPP_DIFF__BASELINE
1722 * PERF_HPP_DIFF__DELTA
1723 * PERF_HPP_DIFF__RATIO
1724 * PERF_HPP_DIFF__WEIGHTED_DIFF
1725 * PERF_HPP_DIFF__CYCLES
1726 */
1727 data__hpp_register(d, i ? compute_2_hpp[compute] :
1728 PERF_HPP_DIFF__BASELINE);
1729
1730 if (cycles_hist && i)
1731 data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1732
1733 /*
1734 * And the rest:
1735 *
1736 * PERF_HPP_DIFF__FORMULA
1737 * PERF_HPP_DIFF__PERIOD
1738 * PERF_HPP_DIFF__PERIOD_BASELINE
1739 */
1740 if (show_formula && i)
1741 data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1742
1743 if (show_period)
1744 data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1745 PERF_HPP_DIFF__PERIOD_BASELINE);
1746 }
1747
1748 if (!sort_compute)
1749 return 0;
1750
1751 /*
1752 * Prepend an fmt to sort on columns at 'sort_compute' first.
1753 * This fmt is added only to the sort list but not to the
1754 * output fields list.
1755 *
1756 * Note that this column (data) can be compared twice - one
1757 * for this 'sort_compute' fmt and another for the normal
1758 * diff_hpp_fmt. But it shouldn't a problem as most entries
1759 * will be sorted out by first try or baseline and comparing
1760 * is not a costly operation.
1761 */
1762 fmt = zalloc(sizeof(*fmt));
1763 if (fmt == NULL) {
1764 pr_err("Memory allocation failed\n");
1765 return -1;
1766 }
1767
1768 fmt->cmp = hist_entry__cmp_nop;
1769 fmt->collapse = hist_entry__cmp_nop;
1770
1771 switch (compute) {
1772 case COMPUTE_DELTA:
1773 fmt->sort = hist_entry__cmp_delta_idx;
1774 break;
1775 case COMPUTE_RATIO:
1776 fmt->sort = hist_entry__cmp_ratio_idx;
1777 break;
1778 case COMPUTE_WEIGHTED_DIFF:
1779 fmt->sort = hist_entry__cmp_wdiff_idx;
1780 break;
1781 case COMPUTE_DELTA_ABS:
1782 fmt->sort = hist_entry__cmp_delta_abs_idx;
1783 break;
1784 case COMPUTE_CYCLES:
1785 /*
1786 * Should set since 'fmt->sort' is called without
1787 * checking valid during sorting
1788 */
1789 fmt->sort = hist_entry__cmp_nop;
1790 break;
1791 default:
1792 BUG_ON(1);
1793 }
1794
1795 perf_hpp__prepend_sort_field(fmt);
1796 return 0;
1797}
1798
1799static int data_init(int argc, const char **argv)
1800{
1801 struct data__file *d;
1802 static const char *defaults[] = {
1803 "perf.data.old",
1804 "perf.data",
1805 };
1806 bool use_default = true;
1807 int i;
1808
1809 data__files_cnt = 2;
1810
1811 if (argc) {
1812 if (argc == 1)
1813 defaults[1] = argv[0];
1814 else {
1815 data__files_cnt = argc;
1816 use_default = false;
1817 }
1818 } else if (perf_guest) {
1819 defaults[0] = "perf.data.host";
1820 defaults[1] = "perf.data.guest";
1821 }
1822
1823 if (sort_compute >= (unsigned int) data__files_cnt) {
1824 pr_err("Order option out of limit.\n");
1825 return -EINVAL;
1826 }
1827
1828 data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1829 if (!data__files)
1830 return -ENOMEM;
1831
1832 data__for_each_file(i, d) {
1833 struct perf_data *data = &d->data;
1834
1835 data->path = use_default ? defaults[i] : argv[i];
1836 data->mode = PERF_DATA_MODE_READ,
1837 data->force = force,
1838
1839 d->idx = i;
1840 }
1841
1842 return 0;
1843}
1844
1845static int diff__config(const char *var, const char *value,
1846 void *cb __maybe_unused)
1847{
1848 if (!strcmp(var, "diff.order")) {
1849 int ret;
1850 if (perf_config_int(&ret, var, value) < 0)
1851 return -1;
1852 sort_compute = ret;
1853 return 0;
1854 }
1855 if (!strcmp(var, "diff.compute")) {
1856 if (!strcmp(value, "delta")) {
1857 compute = COMPUTE_DELTA;
1858 } else if (!strcmp(value, "delta-abs")) {
1859 compute = COMPUTE_DELTA_ABS;
1860 } else if (!strcmp(value, "ratio")) {
1861 compute = COMPUTE_RATIO;
1862 } else if (!strcmp(value, "wdiff")) {
1863 compute = COMPUTE_WEIGHTED_DIFF;
1864 } else {
1865 pr_err("Invalid compute method: %s\n", value);
1866 return -1;
1867 }
1868 }
1869
1870 return 0;
1871}
1872
1873int cmd_diff(int argc, const char **argv)
1874{
1875 int ret = hists__init();
1876
1877 if (ret < 0)
1878 return ret;
1879
1880 perf_config(diff__config, NULL);
1881
1882 argc = parse_options(argc, argv, options, diff_usage, 0);
1883
1884 if (quiet)
1885 perf_quiet_option();
1886
1887 if (cycles_hist && (compute != COMPUTE_CYCLES))
1888 usage_with_options(diff_usage, options);
1889
1890 symbol__annotation_init();
1891
1892 if (symbol__init(NULL) < 0)
1893 return -1;
1894
1895 if (data_init(argc, argv) < 0)
1896 return -1;
1897
1898 if (check_file_brstack() < 0)
1899 return -1;
1900
1901 if (compute == COMPUTE_CYCLES && !pdiff.has_br_stack)
1902 return -1;
1903
1904 if (ui_init() < 0)
1905 return -1;
1906
1907 sort__mode = SORT_MODE__DIFF;
1908
1909 if (setup_sorting(NULL) < 0)
1910 usage_with_options(diff_usage, options);
1911
1912 setup_pager();
1913
1914 sort__setup_elide(NULL);
1915
1916 return __cmd_diff();
1917}