blob: 3153e492dbcc29e1593b6df29357424dd012da99 [file] [log] [blame]
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";
Ian Munsiec0555642010-04-13 18:37:33 +100022static bool force;
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -020023static bool show_displacement;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020024
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030025static int hists__add_entry(struct hists *self,
Arnaldo Carvalho de Meloc82ee822010-05-14 14:19:35 -030026 struct addr_location *al, u64 period)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020027{
Arnaldo Carvalho de Meloc82ee822010-05-14 14:19:35 -030028 if (__hists__add_entry(self, al, NULL, period) != NULL)
Arnaldo Carvalho de Melo28e2a102010-05-09 13:02:23 -030029 return 0;
30 return -ENOMEM;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020031}
32
Arnaldo Carvalho de Melo640c03c2010-12-02 14:10:21 -020033static int diff__process_sample_event(event_t *event,
34 struct sample_data *sample,
35 struct perf_session *session)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020036{
37 struct addr_location al;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020038
Arnaldo Carvalho de Melo640c03c2010-12-02 14:10:21 -020039 if (event__preprocess_sample(event, session, &al, sample, NULL) < 0) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020040 pr_warning("problem processing %d event, skipping it.\n",
41 event->header.type);
42 return -1;
43 }
44
Arnaldo Carvalho de Melocdbae312009-12-28 22:48:35 -020045 if (al.filtered || al.sym == NULL)
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -020046 return 0;
47
Arnaldo Carvalho de Melo640c03c2010-12-02 14:10:21 -020048 if (hists__add_entry(&session->hists, &al, sample->period)) {
Arnaldo Carvalho de Meloc82ee822010-05-14 14:19:35 -030049 pr_warning("problem incrementing symbol period, skipping event\n");
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020050 return -1;
51 }
52
Arnaldo Carvalho de Melo640c03c2010-12-02 14:10:21 -020053 session->hists.stats.total_period += sample->period;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020054 return 0;
55}
56
57static struct perf_event_ops event_ops = {
Arnaldo Carvalho de Melo55aa6402009-12-27 21:37:05 -020058 .sample = diff__process_sample_event,
59 .mmap = event__process_mmap,
60 .comm = event__process_comm,
61 .exit = event__process_task,
62 .fork = event__process_task,
63 .lost = event__process_lost,
Ian Munsieeac23d12010-12-09 16:33:53 +110064 .ordered_samples = true,
65 .ordering_requires_timestamps = true,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020066};
67
68static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
69 struct hist_entry *he)
70{
71 struct rb_node **p = &root->rb_node;
72 struct rb_node *parent = NULL;
73 struct hist_entry *iter;
74
75 while (*p != NULL) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020076 parent = *p;
77 iter = rb_entry(parent, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020078 if (hist_entry__cmp(he, iter) < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020079 p = &(*p)->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020080 else
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020081 p = &(*p)->rb_right;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020082 }
83
84 rb_link_node(&he->rb_node, parent, p);
85 rb_insert_color(&he->rb_node, root);
86}
87
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030088static void hists__resort_entries(struct hists *self)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020089{
90 unsigned long position = 1;
91 struct rb_root tmp = RB_ROOT;
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030092 struct rb_node *next = rb_first(&self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020093
94 while (next != NULL) {
95 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
96
97 next = rb_next(&n->rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030098 rb_erase(&n->rb_node, &self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020099 n->position = position++;
100 perf_session__insert_hist_entry_by_name(&tmp, n);
101 }
102
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300103 self->entries = tmp;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200104}
105
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300106static void hists__set_positions(struct hists *self)
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200107{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300108 hists__output_resort(self);
109 hists__resort_entries(self);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200110}
111
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300112static struct hist_entry *hists__find_entry(struct hists *self,
113 struct hist_entry *he)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200114{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300115 struct rb_node *n = self->entries.rb_node;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200116
117 while (n) {
118 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200119 int64_t cmp = hist_entry__cmp(he, iter);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200120
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200121 if (cmp < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200122 n = n->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200123 else if (cmp > 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200124 n = n->rb_right;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200125 else
126 return iter;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200127 }
128
129 return NULL;
130}
131
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300132static void hists__match(struct hists *older, struct hists *newer)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200133{
134 struct rb_node *nd;
135
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300136 for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200137 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300138 pos->pair = hists__find_entry(older, pos);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200139 }
140}
141
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200142static int __cmd_diff(void)
143{
144 int ret, i;
145 struct perf_session *session[2];
146
Ian Munsie21ef97f2010-12-10 14:09:16 +1100147 session[0] = perf_session__new(input_old, O_RDONLY, force, false, &event_ops);
148 session[1] = perf_session__new(input_new, O_RDONLY, force, false, &event_ops);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200149 if (session[0] == NULL || session[1] == NULL)
150 return -ENOMEM;
151
152 for (i = 0; i < 2; ++i) {
153 ret = perf_session__process_events(session[i], &event_ops);
154 if (ret)
155 goto out_delete;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200156 }
157
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300158 hists__output_resort(&session[1]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200159 if (show_displacement)
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300160 hists__set_positions(&session[0]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200161
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300162 hists__match(&session[0]->hists, &session[1]->hists);
163 hists__fprintf(&session[1]->hists, &session[0]->hists,
164 show_displacement, stdout);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200165out_delete:
166 for (i = 0; i < 2; ++i)
167 perf_session__delete(session[i]);
168 return ret;
169}
170
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200171static const char * const diff_usage[] = {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200172 "perf diff [<options>] [old_file] [new_file]",
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200173 NULL,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200174};
175
176static const struct option options[] = {
Ian Munsiec0555642010-04-13 18:37:33 +1000177 OPT_INCR('v', "verbose", &verbose,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200178 "be more verbose (show symbol address, etc)"),
Shawn Bohrer34295552010-11-30 19:57:11 -0600179 OPT_BOOLEAN('M', "displacement", &show_displacement,
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200180 "Show position displacement relative to baseline"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200181 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
182 "dump raw trace in ASCII"),
183 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
184 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
185 "load module symbols - WARNING: use only with -k and LIVE kernel"),
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -0200186 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
187 "only consider symbols in these dsos"),
188 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
189 "only consider symbols in these comms"),
190 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
191 "only consider these symbols"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200192 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
193 "sort by key(s): pid, comm, dso, symbol, parent"),
194 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
195 "separator for columns, no spaces will be added between "
196 "columns '.' is reserved."),
David Ahernec5761e2010-12-09 13:27:07 -0700197 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
198 "Look for files with symbols relative to this directory"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200199 OPT_END()
200};
201
202int cmd_diff(int argc, const char **argv, const char *prefix __used)
203{
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -0200204 sort_order = diff__default_sort_order;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200205 argc = parse_options(argc, argv, options, diff_usage, 0);
206 if (argc) {
207 if (argc > 2)
208 usage_with_options(diff_usage, options);
209 if (argc == 2) {
210 input_old = argv[0];
211 input_new = argv[1];
212 } else
213 input_new = argv[0];
Zhang, Yanmina1645ce2010-04-19 13:32:50 +0800214 } else if (symbol_conf.default_guest_vmlinux_name ||
215 symbol_conf.default_guest_kallsyms) {
216 input_old = "perf.data.host";
217 input_new = "perf.data.guest";
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200218 }
219
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200220 symbol_conf.exclude_other = false;
Arnaldo Carvalho de Melo655000e2009-12-15 20:04:40 -0200221 if (symbol__init() < 0)
222 return -1;
223
224 setup_sorting(diff_usage, options);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200225 setup_pager();
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200226
227 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
228 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
229 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
230
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200231 return __cmd_diff();
232}