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: %#Lx\n", event->header.misc,
46 event->ip.pid, event->ip.ip);
48 if (event__preprocess_sample(event, session, &al, NULL) < 0) {
49 pr_warning("problem processing %d event, skipping it.\n",
54 if (al.filtered || al.sym == NULL)
57 event__parse_sample(event, session->sample_type, &data);
59 if (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 .sample = diff__process_sample_event,
70 .mmap = event__process_mmap,
71 .comm = event__process_comm,
72 .exit = event__process_task,
73 .fork = event__process_task,
74 .lost = 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;
86 iter = rb_entry(parent, struct hist_entry, rb_node);
87 if (hist_entry__cmp(he, iter) < 0)
93 rb_link_node(&he->rb_node, parent, p);
94 rb_insert_color(&he->rb_node, root);
97 static void perf_session__resort_hist_entries(struct perf_session *self)
99 unsigned long position = 1;
100 struct rb_root tmp = RB_ROOT;
101 struct rb_node *next = rb_first(&self->hists);
103 while (next != NULL) {
104 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
106 next = rb_next(&n->rb_node);
107 rb_erase(&n->rb_node, &self->hists);
108 n->position = position++;
109 perf_session__insert_hist_entry_by_name(&tmp, n);
115 static void perf_session__set_hist_entries_positions(struct perf_session *self)
117 perf_session__output_resort(self, self->events_stats.total);
118 perf_session__resort_hist_entries(self);
121 static struct hist_entry *
122 perf_session__find_hist_entry(struct perf_session *self,
123 struct hist_entry *he)
125 struct rb_node *n = self->hists.rb_node;
128 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
129 int64_t cmp = hist_entry__cmp(he, iter);
142 static void perf_session__match_hists(struct perf_session *old_session,
143 struct perf_session *new_session)
147 for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
148 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
149 pos->pair = perf_session__find_hist_entry(old_session, pos);
153 static int __cmd_diff(void)
156 struct perf_session *session[2];
158 session[0] = perf_session__new(input_old, O_RDONLY, force);
159 session[1] = perf_session__new(input_new, O_RDONLY, force);
160 if (session[0] == NULL || session[1] == NULL)
163 for (i = 0; i < 2; ++i) {
164 ret = perf_session__process_events(session[i], &event_ops);
169 perf_session__output_resort(session[1], session[1]->events_stats.total);
170 if (show_displacement)
171 perf_session__set_hist_entries_positions(session[0]);
173 perf_session__match_hists(session[0], session[1]);
174 perf_session__fprintf_hists(session[1], session[0],
175 show_displacement, stdout);
177 for (i = 0; i < 2; ++i)
178 perf_session__delete(session[i]);
182 static const char * const diff_usage[] = {
183 "perf diff [<options>] [old_file] [new_file]",
187 static const struct option options[] = {
188 OPT_BOOLEAN('v', "verbose", &verbose,
189 "be more verbose (show symbol address, etc)"),
190 OPT_BOOLEAN('m', "displacement", &show_displacement,
191 "Show position displacement relative to baseline"),
192 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
193 "dump raw trace in ASCII"),
194 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
195 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
196 "load module symbols - WARNING: use only with -k and LIVE kernel"),
197 OPT_BOOLEAN('P', "full-paths", &symbol_conf.full_paths,
198 "Don't shorten the pathnames taking into account the cwd"),
199 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
200 "only consider symbols in these dsos"),
201 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
202 "only consider symbols in these comms"),
203 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
204 "only consider these symbols"),
205 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
206 "sort by key(s): pid, comm, dso, symbol, parent"),
207 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
208 "separator for columns, no spaces will be added between "
209 "columns '.' is reserved."),
213 int cmd_diff(int argc, const char **argv, const char *prefix __used)
215 sort_order = diff__default_sort_order;
216 argc = parse_options(argc, argv, options, diff_usage, 0);
219 usage_with_options(diff_usage, options);
227 symbol_conf.exclude_other = false;
228 if (symbol__init() < 0)
231 setup_sorting(diff_usage, options);
234 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
235 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
236 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);