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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"
12#include "util/session.h"
13#include "util/sort.h"
14#include "util/symbol.h"
15#include "util/util.h"
16
17#include <stdlib.h>
18
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -020019static char const *input_old = "perf.data.old",
20 *input_new = "perf.data";
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -020021static char diff__default_sort_order[] = "dso,symbol";
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -020022static int force;
23static bool show_displacement;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020024
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020025static int perf_session__add_hist_entry(struct perf_session *self,
26 struct addr_location *al, u64 count)
27{
28 bool hit;
Eric B Munsond403d0a2010-03-05 12:51:06 -030029 struct hist_entry *he = __perf_session__add_hist_entry(&self->hists,
30 al, NULL,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020031 count, &hit);
32 if (he == NULL)
33 return -ENOMEM;
34
35 if (hit)
36 he->count += count;
37
38 return 0;
39}
40
41static int diff__process_sample_event(event_t *event, struct perf_session *session)
42{
43 struct addr_location al;
44 struct sample_data data = { .period = 1, };
45
Arnaldo Carvalho de Melo0d755032010-01-14 12:23:09 -020046 dump_printf("(IP, %d): %d: %#Lx\n", event->header.misc,
47 event->ip.pid, event->ip.ip);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020048
49 if (event__preprocess_sample(event, session, &al, NULL) < 0) {
50 pr_warning("problem processing %d event, skipping it.\n",
51 event->header.type);
52 return -1;
53 }
54
Arnaldo Carvalho de Melocdbae312009-12-28 22:48:35 -020055 if (al.filtered || al.sym == NULL)
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -020056 return 0;
57
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020058 event__parse_sample(event, session->sample_type, &data);
59
Arnaldo Carvalho de Melocdbae312009-12-28 22:48:35 -020060 if (perf_session__add_hist_entry(session, &al, data.period)) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020061 pr_warning("problem incrementing symbol count, skipping event\n");
62 return -1;
63 }
64
65 session->events_stats.total += data.period;
66 return 0;
67}
68
69static struct perf_event_ops event_ops = {
Arnaldo Carvalho de Melo55aa6402009-12-27 21:37:05 -020070 .sample = diff__process_sample_event,
71 .mmap = event__process_mmap,
72 .comm = event__process_comm,
73 .exit = event__process_task,
74 .fork = event__process_task,
75 .lost = event__process_lost,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020076};
77
78static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
79 struct hist_entry *he)
80{
81 struct rb_node **p = &root->rb_node;
82 struct rb_node *parent = NULL;
83 struct hist_entry *iter;
84
85 while (*p != NULL) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020086 parent = *p;
87 iter = rb_entry(parent, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020088 if (hist_entry__cmp(he, iter) < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020089 p = &(*p)->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020090 else
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020091 p = &(*p)->rb_right;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020092 }
93
94 rb_link_node(&he->rb_node, parent, p);
95 rb_insert_color(&he->rb_node, root);
96}
97
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020098static void perf_session__resort_hist_entries(struct perf_session *self)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020099{
100 unsigned long position = 1;
101 struct rb_root tmp = RB_ROOT;
102 struct rb_node *next = rb_first(&self->hists);
103
104 while (next != NULL) {
105 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
106
107 next = rb_next(&n->rb_node);
108 rb_erase(&n->rb_node, &self->hists);
109 n->position = position++;
110 perf_session__insert_hist_entry_by_name(&tmp, n);
111 }
112
113 self->hists = tmp;
114}
115
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200116static void perf_session__set_hist_entries_positions(struct perf_session *self)
117{
Eric B Munsoneefc4652010-03-05 12:51:08 -0300118 perf_session__output_resort(&self->hists, self->events_stats.total);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200119 perf_session__resort_hist_entries(self);
120}
121
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200122static struct hist_entry *
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200123perf_session__find_hist_entry(struct perf_session *self,
124 struct hist_entry *he)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200125{
126 struct rb_node *n = self->hists.rb_node;
127
128 while (n) {
129 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200130 int64_t cmp = hist_entry__cmp(he, iter);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200131
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200132 if (cmp < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200133 n = n->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200134 else if (cmp > 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200135 n = n->rb_right;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200136 else
137 return iter;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200138 }
139
140 return NULL;
141}
142
143static void perf_session__match_hists(struct perf_session *old_session,
144 struct perf_session *new_session)
145{
146 struct rb_node *nd;
147
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200148 for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
149 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200150 pos->pair = perf_session__find_hist_entry(old_session, pos);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200151 }
152}
153
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200154static int __cmd_diff(void)
155{
156 int ret, i;
157 struct perf_session *session[2];
158
Arnaldo Carvalho de Melo75be6cf2009-12-15 20:04:39 -0200159 session[0] = perf_session__new(input_old, O_RDONLY, force);
160 session[1] = perf_session__new(input_new, O_RDONLY, force);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200161 if (session[0] == NULL || session[1] == NULL)
162 return -ENOMEM;
163
164 for (i = 0; i < 2; ++i) {
165 ret = perf_session__process_events(session[i], &event_ops);
166 if (ret)
167 goto out_delete;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200168 }
169
Eric B Munsoneefc4652010-03-05 12:51:08 -0300170 perf_session__output_resort(&session[1]->hists,
171 session[1]->events_stats.total);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200172 if (show_displacement)
173 perf_session__set_hist_entries_positions(session[0]);
174
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200175 perf_session__match_hists(session[0], session[1]);
Eric B Munsoneefc4652010-03-05 12:51:08 -0300176 perf_session__fprintf_hists(&session[1]->hists, session[0],
177 show_displacement, stdout,
178 session[1]->events_stats.total);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200179out_delete:
180 for (i = 0; i < 2; ++i)
181 perf_session__delete(session[i]);
182 return ret;
183}
184
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200185static const char * const diff_usage[] = {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200186 "perf diff [<options>] [old_file] [new_file]",
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200187 NULL,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200188};
189
190static const struct option options[] = {
191 OPT_BOOLEAN('v', "verbose", &verbose,
192 "be more verbose (show symbol address, etc)"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200193 OPT_BOOLEAN('m', "displacement", &show_displacement,
194 "Show position displacement relative to baseline"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200195 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
196 "dump raw trace in ASCII"),
197 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
198 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
199 "load module symbols - WARNING: use only with -k and LIVE kernel"),
Arnaldo Carvalho de Melof7d87442009-12-27 21:37:04 -0200200 OPT_BOOLEAN('P', "full-paths", &symbol_conf.full_paths,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200201 "Don't shorten the pathnames taking into account the cwd"),
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -0200202 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
203 "only consider symbols in these dsos"),
204 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
205 "only consider symbols in these comms"),
206 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
207 "only consider these symbols"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200208 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
209 "sort by key(s): pid, comm, dso, symbol, parent"),
210 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
211 "separator for columns, no spaces will be added between "
212 "columns '.' is reserved."),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200213 OPT_END()
214};
215
216int cmd_diff(int argc, const char **argv, const char *prefix __used)
217{
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -0200218 sort_order = diff__default_sort_order;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200219 argc = parse_options(argc, argv, options, diff_usage, 0);
220 if (argc) {
221 if (argc > 2)
222 usage_with_options(diff_usage, options);
223 if (argc == 2) {
224 input_old = argv[0];
225 input_new = argv[1];
226 } else
227 input_new = argv[0];
228 }
229
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200230 symbol_conf.exclude_other = false;
Arnaldo Carvalho de Melo655000e2009-12-15 20:04:40 -0200231 if (symbol__init() < 0)
232 return -1;
233
234 setup_sorting(diff_usage, options);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200235 setup_pager();
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200236
237 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
238 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
239 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
240
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200241 return __cmd_diff();
242}