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86a9eee0 ACM |
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/session.h" | |
13 | #include "util/sort.h" | |
14 | #include "util/symbol.h" | |
15 | #include "util/util.h" | |
16 | ||
17 | #include <stdlib.h> | |
18 | ||
19 | static char const *input_old = "perf.data.old", | |
20 | *input_new = "perf.data"; | |
21 | static int force; | |
22 | static bool show_percent; | |
23 | ||
86a9eee0 ACM |
24 | static int perf_session__add_hist_entry(struct perf_session *self, |
25 | struct addr_location *al, u64 count) | |
26 | { | |
27 | bool hit; | |
28 | struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL, | |
29 | count, &hit); | |
30 | if (he == NULL) | |
31 | return -ENOMEM; | |
32 | ||
33 | if (hit) | |
34 | he->count += count; | |
35 | ||
36 | return 0; | |
37 | } | |
38 | ||
39 | static int diff__process_sample_event(event_t *event, struct perf_session *session) | |
40 | { | |
41 | struct addr_location al; | |
42 | struct sample_data data = { .period = 1, }; | |
43 | ||
44 | dump_printf("(IP, %d): %d: %p\n", event->header.misc, | |
45 | event->ip.pid, (void *)(long)event->ip.ip); | |
46 | ||
47 | if (event__preprocess_sample(event, session, &al, NULL) < 0) { | |
48 | pr_warning("problem processing %d event, skipping it.\n", | |
49 | event->header.type); | |
50 | return -1; | |
51 | } | |
52 | ||
c410a338 ACM |
53 | if (al.filtered) |
54 | return 0; | |
55 | ||
86a9eee0 ACM |
56 | event__parse_sample(event, session->sample_type, &data); |
57 | ||
58 | if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) { | |
59 | pr_warning("problem incrementing symbol count, skipping event\n"); | |
60 | return -1; | |
61 | } | |
62 | ||
63 | session->events_stats.total += data.period; | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static struct perf_event_ops event_ops = { | |
68 | .process_sample_event = diff__process_sample_event, | |
69 | .process_mmap_event = event__process_mmap, | |
70 | .process_comm_event = event__process_comm, | |
71 | .process_exit_event = event__process_task, | |
72 | .process_fork_event = event__process_task, | |
73 | .process_lost_event = event__process_lost, | |
74 | }; | |
75 | ||
76 | static void perf_session__insert_hist_entry_by_name(struct rb_root *root, | |
77 | struct hist_entry *he) | |
78 | { | |
79 | struct rb_node **p = &root->rb_node; | |
80 | struct rb_node *parent = NULL; | |
81 | struct hist_entry *iter; | |
82 | ||
83 | while (*p != NULL) { | |
84 | int cmp; | |
85 | parent = *p; | |
86 | iter = rb_entry(parent, struct hist_entry, rb_node); | |
87 | ||
88 | cmp = strcmp(he->map->dso->name, iter->map->dso->name); | |
89 | if (cmp > 0) | |
90 | p = &(*p)->rb_left; | |
91 | else if (cmp < 0) | |
92 | p = &(*p)->rb_right; | |
93 | else { | |
94 | cmp = strcmp(he->sym->name, iter->sym->name); | |
95 | if (cmp > 0) | |
96 | p = &(*p)->rb_left; | |
97 | else | |
98 | p = &(*p)->rb_right; | |
99 | } | |
100 | } | |
101 | ||
102 | rb_link_node(&he->rb_node, parent, p); | |
103 | rb_insert_color(&he->rb_node, root); | |
104 | } | |
105 | ||
106 | static void perf_session__resort_by_name(struct perf_session *self) | |
107 | { | |
108 | unsigned long position = 1; | |
109 | struct rb_root tmp = RB_ROOT; | |
110 | struct rb_node *next = rb_first(&self->hists); | |
111 | ||
112 | while (next != NULL) { | |
113 | struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node); | |
114 | ||
115 | next = rb_next(&n->rb_node); | |
116 | rb_erase(&n->rb_node, &self->hists); | |
117 | n->position = position++; | |
118 | perf_session__insert_hist_entry_by_name(&tmp, n); | |
119 | } | |
120 | ||
121 | self->hists = tmp; | |
122 | } | |
123 | ||
124 | static struct hist_entry * | |
125 | perf_session__find_hist_entry_by_name(struct perf_session *self, | |
126 | struct hist_entry *he) | |
127 | { | |
128 | struct rb_node *n = self->hists.rb_node; | |
129 | ||
130 | while (n) { | |
131 | struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node); | |
132 | int cmp = strcmp(he->map->dso->name, iter->map->dso->name); | |
133 | ||
134 | if (cmp > 0) | |
135 | n = n->rb_left; | |
136 | else if (cmp < 0) | |
137 | n = n->rb_right; | |
138 | else { | |
139 | cmp = strcmp(he->sym->name, iter->sym->name); | |
140 | if (cmp > 0) | |
141 | n = n->rb_left; | |
142 | else if (cmp < 0) | |
143 | n = n->rb_right; | |
144 | else | |
145 | return iter; | |
146 | } | |
147 | } | |
148 | ||
149 | return NULL; | |
150 | } | |
151 | ||
152 | static void perf_session__match_hists(struct perf_session *old_session, | |
153 | struct perf_session *new_session) | |
154 | { | |
155 | struct rb_node *nd; | |
156 | ||
157 | perf_session__resort_by_name(old_session); | |
158 | ||
159 | for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) { | |
160 | struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node); | |
161 | pos->pair = perf_session__find_hist_entry_by_name(old_session, pos); | |
162 | } | |
163 | } | |
164 | ||
165 | static size_t hist_entry__fprintf_matched(struct hist_entry *self, | |
166 | unsigned long pos, | |
167 | struct perf_session *session, | |
168 | struct perf_session *pair_session, | |
169 | FILE *fp) | |
170 | { | |
171 | u64 old_count = 0; | |
172 | char displacement[16]; | |
173 | size_t printed; | |
174 | ||
175 | if (self->pair != NULL) { | |
176 | long pdiff = (long)self->pair->position - (long)pos; | |
177 | old_count = self->pair->count; | |
178 | if (pdiff == 0) | |
179 | goto blank; | |
180 | snprintf(displacement, sizeof(displacement), "%+4ld", pdiff); | |
181 | } else { | |
182 | blank: memset(displacement, ' ', sizeof(displacement)); | |
183 | } | |
184 | ||
185 | printed = fprintf(fp, "%4lu %5.5s ", pos, displacement); | |
186 | ||
187 | if (show_percent) { | |
c410a338 ACM |
188 | double old_percent = 0, new_percent = 0, diff; |
189 | ||
190 | if (pair_session->events_stats.total > 0) | |
191 | old_percent = (old_count * 100) / pair_session->events_stats.total; | |
192 | if (session->events_stats.total > 0) | |
193 | new_percent = (self->count * 100) / session->events_stats.total; | |
86a9eee0 | 194 | |
c410a338 | 195 | diff = old_percent - new_percent; |
86a9eee0 ACM |
196 | if (verbose) |
197 | printed += fprintf(fp, " %3.2f%% %3.2f%%", old_percent, new_percent); | |
198 | ||
199 | if ((u64)diff != 0) | |
200 | printed += fprintf(fp, " %+4.2F%%", diff); | |
201 | else | |
202 | printed += fprintf(fp, " "); | |
203 | } else { | |
204 | if (verbose) | |
205 | printed += fprintf(fp, " %9Lu %9Lu", old_count, self->count); | |
206 | printed += fprintf(fp, " %+9Ld", (s64)self->count - (s64)old_count); | |
207 | } | |
208 | ||
209 | return printed + fprintf(fp, " %25.25s %s\n", | |
210 | self->map->dso->name, self->sym->name); | |
211 | } | |
212 | ||
213 | static size_t perf_session__fprintf_matched_hists(struct perf_session *self, | |
214 | struct perf_session *pair, | |
215 | FILE *fp) | |
216 | { | |
217 | struct rb_node *nd; | |
218 | size_t printed = 0; | |
219 | unsigned long pos = 1; | |
220 | ||
221 | for (nd = rb_first(&self->hists); nd; nd = rb_next(nd)) { | |
222 | struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node); | |
223 | printed += hist_entry__fprintf_matched(he, pos++, self, pair, fp); | |
224 | } | |
225 | ||
226 | return printed; | |
227 | } | |
228 | ||
229 | static int __cmd_diff(void) | |
230 | { | |
231 | int ret, i; | |
232 | struct perf_session *session[2]; | |
233 | ||
75be6cf4 ACM |
234 | session[0] = perf_session__new(input_old, O_RDONLY, force); |
235 | session[1] = perf_session__new(input_new, O_RDONLY, force); | |
86a9eee0 ACM |
236 | if (session[0] == NULL || session[1] == NULL) |
237 | return -ENOMEM; | |
238 | ||
239 | for (i = 0; i < 2; ++i) { | |
240 | ret = perf_session__process_events(session[i], &event_ops); | |
241 | if (ret) | |
242 | goto out_delete; | |
243 | perf_session__output_resort(session[i], session[i]->events_stats.total); | |
244 | } | |
245 | ||
246 | perf_session__match_hists(session[0], session[1]); | |
247 | perf_session__fprintf_matched_hists(session[1], session[0], stdout); | |
248 | out_delete: | |
249 | for (i = 0; i < 2; ++i) | |
250 | perf_session__delete(session[i]); | |
251 | return ret; | |
252 | } | |
253 | ||
254 | static const char *const diff_usage[] = { | |
255 | "perf diff [<options>] [old_file] [new_file]", | |
256 | }; | |
257 | ||
258 | static const struct option options[] = { | |
259 | OPT_BOOLEAN('v', "verbose", &verbose, | |
260 | "be more verbose (show symbol address, etc)"), | |
261 | OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, | |
262 | "dump raw trace in ASCII"), | |
263 | OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), | |
264 | OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules, | |
265 | "load module symbols - WARNING: use only with -k and LIVE kernel"), | |
266 | OPT_BOOLEAN('p', "percentages", &show_percent, | |
267 | "Don't shorten the pathnames taking into account the cwd"), | |
268 | OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths, | |
269 | "Don't shorten the pathnames taking into account the cwd"), | |
c410a338 ACM |
270 | OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]", |
271 | "only consider symbols in these dsos"), | |
272 | OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]", | |
273 | "only consider symbols in these comms"), | |
274 | OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]", | |
275 | "only consider these symbols"), | |
86a9eee0 ACM |
276 | OPT_END() |
277 | }; | |
278 | ||
279 | int cmd_diff(int argc, const char **argv, const char *prefix __used) | |
280 | { | |
86a9eee0 ACM |
281 | argc = parse_options(argc, argv, options, diff_usage, 0); |
282 | if (argc) { | |
283 | if (argc > 2) | |
284 | usage_with_options(diff_usage, options); | |
285 | if (argc == 2) { | |
286 | input_old = argv[0]; | |
287 | input_new = argv[1]; | |
288 | } else | |
289 | input_new = argv[0]; | |
290 | } | |
291 | ||
655000e7 ACM |
292 | if (symbol__init() < 0) |
293 | return -1; | |
294 | ||
295 | setup_sorting(diff_usage, options); | |
86a9eee0 ACM |
296 | setup_pager(); |
297 | return __cmd_diff(); | |
298 | } |