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Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -02001/*
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"
Arnaldo Carvalho de Melo743eb862011-11-28 07:56:39 -020012#include "util/evsel.h"
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020013#include "util/session.h"
Arnaldo Carvalho de Melo45694aa2011-11-28 08:30:20 -020014#include "util/tool.h"
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020015#include "util/sort.h"
16#include "util/symbol.h"
17#include "util/util.h"
18
19#include <stdlib.h>
20
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -020021static char const *input_old = "perf.data.old",
22 *input_new = "perf.data";
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -020023static char diff__default_sort_order[] = "dso,symbol";
Ian Munsiec0555642010-04-13 18:37:33 +100024static bool force;
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -020025static bool show_displacement;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020026
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030027static int hists__add_entry(struct hists *self,
Arnaldo Carvalho de Meloc82ee822010-05-14 14:19:35 -030028 struct addr_location *al, u64 period)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020029{
Arnaldo Carvalho de Meloc82ee822010-05-14 14:19:35 -030030 if (__hists__add_entry(self, al, NULL, period) != NULL)
Arnaldo Carvalho de Melo28e2a102010-05-09 13:02:23 -030031 return 0;
32 return -ENOMEM;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020033}
34
Arnaldo Carvalho de Melo45694aa2011-11-28 08:30:20 -020035static int diff__process_sample_event(struct perf_tool *tool __used,
Arnaldo Carvalho de Melod20deb62011-11-25 08:19:45 -020036 union perf_event *event,
Arnaldo Carvalho de Melo8d50e5b2011-01-29 13:02:00 -020037 struct perf_sample *sample,
Arnaldo Carvalho de Melo9e69c212011-03-15 15:44:01 -030038 struct perf_evsel *evsel __used,
Arnaldo Carvalho de Melo743eb862011-11-28 07:56:39 -020039 struct machine *machine)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020040{
41 struct addr_location al;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020042
Arnaldo Carvalho de Melo743eb862011-11-28 07:56:39 -020043 if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020044 pr_warning("problem processing %d event, skipping it.\n",
45 event->header.type);
46 return -1;
47 }
48
Arnaldo Carvalho de Melocdbae312009-12-28 22:48:35 -020049 if (al.filtered || al.sym == NULL)
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -020050 return 0;
51
Arnaldo Carvalho de Melo743eb862011-11-28 07:56:39 -020052 if (hists__add_entry(&evsel->hists, &al, sample->period)) {
Arnaldo Carvalho de Meloc82ee822010-05-14 14:19:35 -030053 pr_warning("problem incrementing symbol period, skipping event\n");
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020054 return -1;
55 }
56
Arnaldo Carvalho de Melo743eb862011-11-28 07:56:39 -020057 evsel->hists.stats.total_period += sample->period;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020058 return 0;
59}
60
Arnaldo Carvalho de Melo45694aa2011-11-28 08:30:20 -020061static struct perf_tool perf_diff = {
Arnaldo Carvalho de Melo55aa6402009-12-27 21:37:05 -020062 .sample = diff__process_sample_event,
Arnaldo Carvalho de Melo8115d602011-01-29 14:01:45 -020063 .mmap = perf_event__process_mmap,
64 .comm = perf_event__process_comm,
65 .exit = perf_event__process_task,
66 .fork = perf_event__process_task,
67 .lost = perf_event__process_lost,
Ian Munsieeac23d12010-12-09 16:33:53 +110068 .ordered_samples = true,
69 .ordering_requires_timestamps = true,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020070};
71
72static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
73 struct hist_entry *he)
74{
75 struct rb_node **p = &root->rb_node;
76 struct rb_node *parent = NULL;
77 struct hist_entry *iter;
78
79 while (*p != NULL) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020080 parent = *p;
81 iter = rb_entry(parent, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020082 if (hist_entry__cmp(he, iter) < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020083 p = &(*p)->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020084 else
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020085 p = &(*p)->rb_right;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020086 }
87
88 rb_link_node(&he->rb_node, parent, p);
89 rb_insert_color(&he->rb_node, root);
90}
91
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030092static void hists__resort_entries(struct hists *self)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020093{
94 unsigned long position = 1;
95 struct rb_root tmp = RB_ROOT;
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030096 struct rb_node *next = rb_first(&self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020097
98 while (next != NULL) {
99 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
100
101 next = rb_next(&n->rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300102 rb_erase(&n->rb_node, &self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200103 n->position = position++;
104 perf_session__insert_hist_entry_by_name(&tmp, n);
105 }
106
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300107 self->entries = tmp;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200108}
109
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300110static void hists__set_positions(struct hists *self)
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200111{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300112 hists__output_resort(self);
113 hists__resort_entries(self);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200114}
115
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300116static struct hist_entry *hists__find_entry(struct hists *self,
117 struct hist_entry *he)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200118{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300119 struct rb_node *n = self->entries.rb_node;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200120
121 while (n) {
122 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200123 int64_t cmp = hist_entry__cmp(he, iter);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200124
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200125 if (cmp < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200126 n = n->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200127 else if (cmp > 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200128 n = n->rb_right;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200129 else
130 return iter;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200131 }
132
133 return NULL;
134}
135
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300136static void hists__match(struct hists *older, struct hists *newer)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200137{
138 struct rb_node *nd;
139
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300140 for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200141 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300142 pos->pair = hists__find_entry(older, pos);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200143 }
144}
145
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200146static int __cmd_diff(void)
147{
148 int ret, i;
149 struct perf_session *session[2];
150
Arnaldo Carvalho de Melo45694aa2011-11-28 08:30:20 -0200151 session[0] = perf_session__new(input_old, O_RDONLY, force, false, &perf_diff);
152 session[1] = perf_session__new(input_new, O_RDONLY, force, false, &perf_diff);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200153 if (session[0] == NULL || session[1] == NULL)
154 return -ENOMEM;
155
156 for (i = 0; i < 2; ++i) {
Arnaldo Carvalho de Melo45694aa2011-11-28 08:30:20 -0200157 ret = perf_session__process_events(session[i], &perf_diff);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200158 if (ret)
159 goto out_delete;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200160 }
161
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300162 hists__output_resort(&session[1]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200163 if (show_displacement)
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300164 hists__set_positions(&session[0]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200165
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300166 hists__match(&session[0]->hists, &session[1]->hists);
167 hists__fprintf(&session[1]->hists, &session[0]->hists,
Arnaldo Carvalho de Meloef9dfe62011-09-26 12:46:11 -0300168 show_displacement, true, 0, 0, stdout);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200169out_delete:
170 for (i = 0; i < 2; ++i)
171 perf_session__delete(session[i]);
172 return ret;
173}
174
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200175static const char * const diff_usage[] = {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200176 "perf diff [<options>] [old_file] [new_file]",
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200177 NULL,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200178};
179
180static const struct option options[] = {
Ian Munsiec0555642010-04-13 18:37:33 +1000181 OPT_INCR('v', "verbose", &verbose,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200182 "be more verbose (show symbol address, etc)"),
Shawn Bohrer34295552010-11-30 19:57:11 -0600183 OPT_BOOLEAN('M', "displacement", &show_displacement,
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200184 "Show position displacement relative to baseline"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200185 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
186 "dump raw trace in ASCII"),
187 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
188 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
189 "load module symbols - WARNING: use only with -k and LIVE kernel"),
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -0200190 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
191 "only consider symbols in these dsos"),
192 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
193 "only consider symbols in these comms"),
194 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
195 "only consider these symbols"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200196 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
197 "sort by key(s): pid, comm, dso, symbol, parent"),
198 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
199 "separator for columns, no spaces will be added between "
200 "columns '.' is reserved."),
David Ahernec5761e2010-12-09 13:27:07 -0700201 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
202 "Look for files with symbols relative to this directory"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200203 OPT_END()
204};
205
206int cmd_diff(int argc, const char **argv, const char *prefix __used)
207{
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -0200208 sort_order = diff__default_sort_order;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200209 argc = parse_options(argc, argv, options, diff_usage, 0);
210 if (argc) {
211 if (argc > 2)
212 usage_with_options(diff_usage, options);
213 if (argc == 2) {
214 input_old = argv[0];
215 input_new = argv[1];
216 } else
217 input_new = argv[0];
Zhang, Yanmina1645ce2010-04-19 13:32:50 +0800218 } else if (symbol_conf.default_guest_vmlinux_name ||
219 symbol_conf.default_guest_kallsyms) {
220 input_old = "perf.data.host";
221 input_new = "perf.data.guest";
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200222 }
223
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200224 symbol_conf.exclude_other = false;
Arnaldo Carvalho de Melo655000e2009-12-15 20:04:40 -0200225 if (symbol__init() < 0)
226 return -1;
227
228 setup_sorting(diff_usage, options);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200229 setup_pager();
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200230
231 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
232 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
233 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
234
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200235 return __cmd_diff();
236}