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.
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"
19 static char const *input_old = "perf.data.old",
20 *input_new = "perf.data";
21 static char diff__default_sort_order[] = "dso,symbol";
23 static bool show_displacement;
25 static int perf_session__add_hist_entry(struct perf_session *self,
26 struct addr_location *al, u64 count)
29 struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL,
40 static int diff__process_sample_event(event_t *event, struct perf_session *session)
42 struct addr_location al;
43 struct sample_data data = { .period = 1, };
45 dump_printf("(IP, %d): %d: %p\n", event->header.misc,
46 event->ip.pid, (void *)(long)event->ip.ip);
48 if (event__preprocess_sample(event, session, &al, NULL) < 0) {
49 pr_warning("problem processing %d event, skipping it.\n",
57 event__parse_sample(event, session->sample_type, &data);
59 if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) {
60 pr_warning("problem incrementing symbol count, skipping event\n");
64 session->events_stats.total += data.period;
68 static 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,
77 static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
78 struct hist_entry *he)
80 struct rb_node **p = &root->rb_node;
81 struct rb_node *parent = NULL;
82 struct hist_entry *iter;
87 iter = rb_entry(parent, struct hist_entry, rb_node);
89 cmp = strcmp(he->map->dso->name, iter->map->dso->name);
95 cmp = strcmp(he->sym->name, iter->sym->name);
103 rb_link_node(&he->rb_node, parent, p);
104 rb_insert_color(&he->rb_node, root);
107 static void perf_session__resort_by_name(struct perf_session *self)
109 unsigned long position = 1;
110 struct rb_root tmp = RB_ROOT;
111 struct rb_node *next = rb_first(&self->hists);
113 while (next != NULL) {
114 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
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);
125 static struct hist_entry *
126 perf_session__find_hist_entry_by_name(struct perf_session *self,
127 struct hist_entry *he)
129 struct rb_node *n = self->hists.rb_node;
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);
140 cmp = strcmp(he->sym->name, iter->sym->name);
153 static void perf_session__match_hists(struct perf_session *old_session,
154 struct perf_session *new_session)
158 perf_session__resort_by_name(old_session);
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);
166 static int __cmd_diff(void)
169 struct perf_session *session[2];
171 session[0] = perf_session__new(input_old, O_RDONLY, force);
172 session[1] = perf_session__new(input_new, O_RDONLY, force);
173 if (session[0] == NULL || session[1] == NULL)
176 for (i = 0; i < 2; ++i) {
177 ret = perf_session__process_events(session[i], &event_ops);
180 perf_session__output_resort(session[i], session[i]->events_stats.total);
183 perf_session__match_hists(session[0], session[1]);
184 perf_session__fprintf_hists(session[1], session[0],
185 show_displacement, stdout);
187 for (i = 0; i < 2; ++i)
188 perf_session__delete(session[i]);
192 static const char * const diff_usage[] = {
193 "perf diff [<options>] [old_file] [new_file]",
197 static const struct option options[] = {
198 OPT_BOOLEAN('v', "verbose", &verbose,
199 "be more verbose (show symbol address, etc)"),
200 OPT_BOOLEAN('m', "displacement", &show_displacement,
201 "Show position displacement relative to baseline"),
202 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
203 "dump raw trace in ASCII"),
204 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
205 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
206 "load module symbols - WARNING: use only with -k and LIVE kernel"),
207 OPT_BOOLEAN('P', "full-paths", &symbol_conf.full_paths,
208 "Don't shorten the pathnames taking into account the cwd"),
209 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
210 "only consider symbols in these dsos"),
211 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
212 "only consider symbols in these comms"),
213 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
214 "only consider these symbols"),
215 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
216 "sort by key(s): pid, comm, dso, symbol, parent"),
217 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
218 "separator for columns, no spaces will be added between "
219 "columns '.' is reserved."),
223 int cmd_diff(int argc, const char **argv, const char *prefix __used)
225 sort_order = diff__default_sort_order;
226 argc = parse_options(argc, argv, options, diff_usage, 0);
229 usage_with_options(diff_usage, options);
237 symbol_conf.exclude_other = false;
238 if (symbol__init() < 0)
241 setup_sorting(diff_usage, options);
244 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
245 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
246 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);