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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;
29 struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL,
30 count, &hit);
31 if (he == NULL)
32 return -ENOMEM;
33
34 if (hit)
35 he->count += count;
36
37 return 0;
38}
39
40static int diff__process_sample_event(event_t *event, struct perf_session *session)
41{
42 struct addr_location al;
43 struct sample_data data = { .period = 1, };
44
45 dump_printf("(IP, %d): %d: %p\n", event->header.misc,
46 event->ip.pid, (void *)(long)event->ip.ip);
47
48 if (event__preprocess_sample(event, session, &al, NULL) < 0) {
49 pr_warning("problem processing %d event, skipping it.\n",
50 event->header.type);
51 return -1;
52 }
53
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -020054 if (al.filtered)
55 return 0;
56
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020057 event__parse_sample(event, session->sample_type, &data);
58
59 if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) {
60 pr_warning("problem incrementing symbol count, skipping event\n");
61 return -1;
62 }
63
64 session->events_stats.total += data.period;
65 return 0;
66}
67
68static struct perf_event_ops event_ops = {
69 .process_sample_event = diff__process_sample_event,
70 .process_mmap_event = event__process_mmap,
71 .process_comm_event = event__process_comm,
72 .process_exit_event = event__process_task,
73 .process_fork_event = event__process_task,
74 .process_lost_event = event__process_lost,
75};
76
77static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
78 struct hist_entry *he)
79{
80 struct rb_node **p = &root->rb_node;
81 struct rb_node *parent = NULL;
82 struct hist_entry *iter;
83
84 while (*p != NULL) {
85 int cmp;
86 parent = *p;
87 iter = rb_entry(parent, struct hist_entry, rb_node);
88
89 cmp = strcmp(he->map->dso->name, iter->map->dso->name);
90 if (cmp > 0)
91 p = &(*p)->rb_left;
92 else if (cmp < 0)
93 p = &(*p)->rb_right;
94 else {
95 cmp = strcmp(he->sym->name, iter->sym->name);
96 if (cmp > 0)
97 p = &(*p)->rb_left;
98 else
99 p = &(*p)->rb_right;
100 }
101 }
102
103 rb_link_node(&he->rb_node, parent, p);
104 rb_insert_color(&he->rb_node, root);
105}
106
107static void perf_session__resort_by_name(struct perf_session *self)
108{
109 unsigned long position = 1;
110 struct rb_root tmp = RB_ROOT;
111 struct rb_node *next = rb_first(&self->hists);
112
113 while (next != NULL) {
114 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
115
116 next = rb_next(&n->rb_node);
117 rb_erase(&n->rb_node, &self->hists);
118 n->position = position++;
119 perf_session__insert_hist_entry_by_name(&tmp, n);
120 }
121
122 self->hists = tmp;
123}
124
125static struct hist_entry *
126perf_session__find_hist_entry_by_name(struct perf_session *self,
127 struct hist_entry *he)
128{
129 struct rb_node *n = self->hists.rb_node;
130
131 while (n) {
132 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
133 int cmp = strcmp(he->map->dso->name, iter->map->dso->name);
134
135 if (cmp > 0)
136 n = n->rb_left;
137 else if (cmp < 0)
138 n = n->rb_right;
139 else {
140 cmp = strcmp(he->sym->name, iter->sym->name);
141 if (cmp > 0)
142 n = n->rb_left;
143 else if (cmp < 0)
144 n = n->rb_right;
145 else
146 return iter;
147 }
148 }
149
150 return NULL;
151}
152
153static void perf_session__match_hists(struct perf_session *old_session,
154 struct perf_session *new_session)
155{
156 struct rb_node *nd;
157
158 perf_session__resort_by_name(old_session);
159
160 for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
161 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
162 pos->pair = perf_session__find_hist_entry_by_name(old_session, pos);
163 }
164}
165
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200166static int __cmd_diff(void)
167{
168 int ret, i;
169 struct perf_session *session[2];
170
Arnaldo Carvalho de Melo75be6cf2009-12-15 20:04:39 -0200171 session[0] = perf_session__new(input_old, O_RDONLY, force);
172 session[1] = perf_session__new(input_new, O_RDONLY, force);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200173 if (session[0] == NULL || session[1] == NULL)
174 return -ENOMEM;
175
176 for (i = 0; i < 2; ++i) {
177 ret = perf_session__process_events(session[i], &event_ops);
178 if (ret)
179 goto out_delete;
180 perf_session__output_resort(session[i], session[i]->events_stats.total);
181 }
182
183 perf_session__match_hists(session[0], session[1]);
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200184 perf_session__fprintf_hists(session[1], session[0],
185 show_displacement, stdout);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200186out_delete:
187 for (i = 0; i < 2; ++i)
188 perf_session__delete(session[i]);
189 return ret;
190}
191
192static const char *const diff_usage[] = {
193 "perf diff [<options>] [old_file] [new_file]",
194};
195
196static const struct option options[] = {
197 OPT_BOOLEAN('v', "verbose", &verbose,
198 "be more verbose (show symbol address, etc)"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200199 OPT_BOOLEAN('m', "displacement", &show_displacement,
200 "Show position displacement relative to baseline"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200201 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
202 "dump raw trace in ASCII"),
203 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
204 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
205 "load module symbols - WARNING: use only with -k and LIVE kernel"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200206 OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths,
207 "Don't shorten the pathnames taking into account the cwd"),
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -0200208 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
209 "only consider symbols in these dsos"),
210 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
211 "only consider symbols in these comms"),
212 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
213 "only consider these symbols"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200214 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
215 "sort by key(s): pid, comm, dso, symbol, parent"),
216 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
217 "separator for columns, no spaces will be added between "
218 "columns '.' is reserved."),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200219 OPT_END()
220};
221
222int cmd_diff(int argc, const char **argv, const char *prefix __used)
223{
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -0200224 sort_order = diff__default_sort_order;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200225 argc = parse_options(argc, argv, options, diff_usage, 0);
226 if (argc) {
227 if (argc > 2)
228 usage_with_options(diff_usage, options);
229 if (argc == 2) {
230 input_old = argv[0];
231 input_new = argv[1];
232 } else
233 input_new = argv[0];
234 }
235
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200236 symbol_conf.exclude_other = false;
Arnaldo Carvalho de Melo655000e2009-12-15 20:04:40 -0200237 if (symbol__init() < 0)
238 return -1;
239
240 setup_sorting(diff_usage, options);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200241 setup_pager();
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200242
243 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
244 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
245 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
246
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200247 return __cmd_diff();
248}