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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";
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
33static int diff__process_sample_event(event_t *event, struct perf_session *session)
34{
35 struct addr_location al;
36 struct sample_data data = { .period = 1, };
37
Arnaldo Carvalho de Melo41a37e22010-06-04 08:02:07 -030038 if (event__preprocess_sample(event, session, &al, &data, NULL) < 0) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020039 pr_warning("problem processing %d event, skipping it.\n",
40 event->header.type);
41 return -1;
42 }
43
Arnaldo Carvalho de Melocdbae312009-12-28 22:48:35 -020044 if (al.filtered || al.sym == NULL)
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -020045 return 0;
46
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030047 if (hists__add_entry(&session->hists, &al, data.period)) {
Arnaldo Carvalho de Meloc82ee822010-05-14 14:19:35 -030048 pr_warning("problem incrementing symbol period, skipping event\n");
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020049 return -1;
50 }
51
Arnaldo Carvalho de Melocee75ac2010-05-14 13:16:55 -030052 session->hists.stats.total_period += data.period;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020053 return 0;
54}
55
56static struct perf_event_ops event_ops = {
Arnaldo Carvalho de Melo55aa6402009-12-27 21:37:05 -020057 .sample = diff__process_sample_event,
58 .mmap = event__process_mmap,
59 .comm = event__process_comm,
60 .exit = event__process_task,
61 .fork = event__process_task,
62 .lost = event__process_lost,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020063};
64
65static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
66 struct hist_entry *he)
67{
68 struct rb_node **p = &root->rb_node;
69 struct rb_node *parent = NULL;
70 struct hist_entry *iter;
71
72 while (*p != NULL) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020073 parent = *p;
74 iter = rb_entry(parent, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020075 if (hist_entry__cmp(he, iter) < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020076 p = &(*p)->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020077 else
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020078 p = &(*p)->rb_right;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020079 }
80
81 rb_link_node(&he->rb_node, parent, p);
82 rb_insert_color(&he->rb_node, root);
83}
84
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030085static void hists__resort_entries(struct hists *self)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020086{
87 unsigned long position = 1;
88 struct rb_root tmp = RB_ROOT;
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030089 struct rb_node *next = rb_first(&self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020090
91 while (next != NULL) {
92 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
93
94 next = rb_next(&n->rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030095 rb_erase(&n->rb_node, &self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020096 n->position = position++;
97 perf_session__insert_hist_entry_by_name(&tmp, n);
98 }
99
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300100 self->entries = tmp;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200101}
102
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300103static void hists__set_positions(struct hists *self)
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200104{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300105 hists__output_resort(self);
106 hists__resort_entries(self);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200107}
108
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300109static struct hist_entry *hists__find_entry(struct hists *self,
110 struct hist_entry *he)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200111{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300112 struct rb_node *n = self->entries.rb_node;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200113
114 while (n) {
115 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200116 int64_t cmp = hist_entry__cmp(he, iter);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200117
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200118 if (cmp < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200119 n = n->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200120 else if (cmp > 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200121 n = n->rb_right;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200122 else
123 return iter;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200124 }
125
126 return NULL;
127}
128
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300129static void hists__match(struct hists *older, struct hists *newer)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200130{
131 struct rb_node *nd;
132
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300133 for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200134 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300135 pos->pair = hists__find_entry(older, pos);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200136 }
137}
138
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200139static int __cmd_diff(void)
140{
141 int ret, i;
142 struct perf_session *session[2];
143
Tom Zanussi454c4072010-05-01 01:41:20 -0500144 session[0] = perf_session__new(input_old, O_RDONLY, force, false);
145 session[1] = perf_session__new(input_new, O_RDONLY, force, false);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200146 if (session[0] == NULL || session[1] == NULL)
147 return -ENOMEM;
148
149 for (i = 0; i < 2; ++i) {
150 ret = perf_session__process_events(session[i], &event_ops);
151 if (ret)
152 goto out_delete;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200153 }
154
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300155 hists__output_resort(&session[1]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200156 if (show_displacement)
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300157 hists__set_positions(&session[0]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200158
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300159 hists__match(&session[0]->hists, &session[1]->hists);
160 hists__fprintf(&session[1]->hists, &session[0]->hists,
161 show_displacement, stdout);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200162out_delete:
163 for (i = 0; i < 2; ++i)
164 perf_session__delete(session[i]);
165 return ret;
166}
167
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200168static const char * const diff_usage[] = {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200169 "perf diff [<options>] [old_file] [new_file]",
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200170 NULL,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200171};
172
173static const struct option options[] = {
Ian Munsiec0555642010-04-13 18:37:33 +1000174 OPT_INCR('v', "verbose", &verbose,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200175 "be more verbose (show symbol address, etc)"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200176 OPT_BOOLEAN('m', "displacement", &show_displacement,
177 "Show position displacement relative to baseline"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200178 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
179 "dump raw trace in ASCII"),
180 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
181 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
182 "load module symbols - WARNING: use only with -k and LIVE kernel"),
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -0200183 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
184 "only consider symbols in these dsos"),
185 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
186 "only consider symbols in these comms"),
187 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
188 "only consider these symbols"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200189 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
190 "sort by key(s): pid, comm, dso, symbol, parent"),
191 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
192 "separator for columns, no spaces will be added between "
193 "columns '.' is reserved."),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200194 OPT_END()
195};
196
197int cmd_diff(int argc, const char **argv, const char *prefix __used)
198{
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -0200199 sort_order = diff__default_sort_order;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200200 argc = parse_options(argc, argv, options, diff_usage, 0);
201 if (argc) {
202 if (argc > 2)
203 usage_with_options(diff_usage, options);
204 if (argc == 2) {
205 input_old = argv[0];
206 input_new = argv[1];
207 } else
208 input_new = argv[0];
Zhang, Yanmina1645ce2010-04-19 13:32:50 +0800209 } else if (symbol_conf.default_guest_vmlinux_name ||
210 symbol_conf.default_guest_kallsyms) {
211 input_old = "perf.data.host";
212 input_new = "perf.data.guest";
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200213 }
214
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200215 symbol_conf.exclude_other = false;
Arnaldo Carvalho de Melo655000e2009-12-15 20:04:40 -0200216 if (symbol__init() < 0)
217 return -1;
218
219 setup_sorting(diff_usage, options);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200220 setup_pager();
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200221
222 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
223 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
224 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
225
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200226 return __cmd_diff();
227}