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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
Arnaldo Carvalho de Melo8115d602011-01-29 14:01:45 -020033static int diff__process_sample_event(union perf_event *event,
Arnaldo Carvalho de Melo8d50e5b2011-01-29 13:02:00 -020034 struct perf_sample *sample,
Arnaldo Carvalho de Melo9e69c212011-03-15 15:44:01 -030035 struct perf_evsel *evsel __used,
Arnaldo Carvalho de Melo640c03c2010-12-02 14:10:21 -020036 struct perf_session *session)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020037{
38 struct addr_location al;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020039
Arnaldo Carvalho de Melo8115d602011-01-29 14:01:45 -020040 if (perf_event__preprocess_sample(event, session, &al, sample, NULL) < 0) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020041 pr_warning("problem processing %d event, skipping it.\n",
42 event->header.type);
43 return -1;
44 }
45
Arnaldo Carvalho de Melocdbae312009-12-28 22:48:35 -020046 if (al.filtered || al.sym == NULL)
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -020047 return 0;
48
Arnaldo Carvalho de Melo640c03c2010-12-02 14:10:21 -020049 if (hists__add_entry(&session->hists, &al, sample->period)) {
Arnaldo Carvalho de Meloc82ee822010-05-14 14:19:35 -030050 pr_warning("problem incrementing symbol period, skipping event\n");
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020051 return -1;
52 }
53
Arnaldo Carvalho de Melo640c03c2010-12-02 14:10:21 -020054 session->hists.stats.total_period += sample->period;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020055 return 0;
56}
57
58static struct perf_event_ops event_ops = {
Arnaldo Carvalho de Melo55aa6402009-12-27 21:37:05 -020059 .sample = diff__process_sample_event,
Arnaldo Carvalho de Melo8115d602011-01-29 14:01:45 -020060 .mmap = perf_event__process_mmap,
61 .comm = perf_event__process_comm,
62 .exit = perf_event__process_task,
63 .fork = perf_event__process_task,
64 .lost = perf_event__process_lost,
Ian Munsieeac23d12010-12-09 16:33:53 +110065 .ordered_samples = true,
66 .ordering_requires_timestamps = true,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020067};
68
69static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
70 struct hist_entry *he)
71{
72 struct rb_node **p = &root->rb_node;
73 struct rb_node *parent = NULL;
74 struct hist_entry *iter;
75
76 while (*p != NULL) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020077 parent = *p;
78 iter = rb_entry(parent, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020079 if (hist_entry__cmp(he, iter) < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020080 p = &(*p)->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020081 else
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020082 p = &(*p)->rb_right;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020083 }
84
85 rb_link_node(&he->rb_node, parent, p);
86 rb_insert_color(&he->rb_node, root);
87}
88
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030089static void hists__resort_entries(struct hists *self)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020090{
91 unsigned long position = 1;
92 struct rb_root tmp = RB_ROOT;
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030093 struct rb_node *next = rb_first(&self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020094
95 while (next != NULL) {
96 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
97
98 next = rb_next(&n->rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030099 rb_erase(&n->rb_node, &self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200100 n->position = position++;
101 perf_session__insert_hist_entry_by_name(&tmp, n);
102 }
103
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300104 self->entries = tmp;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200105}
106
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300107static void hists__set_positions(struct hists *self)
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200108{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300109 hists__output_resort(self);
110 hists__resort_entries(self);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200111}
112
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300113static struct hist_entry *hists__find_entry(struct hists *self,
114 struct hist_entry *he)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200115{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300116 struct rb_node *n = self->entries.rb_node;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200117
118 while (n) {
119 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200120 int64_t cmp = hist_entry__cmp(he, iter);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200121
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200122 if (cmp < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200123 n = n->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200124 else if (cmp > 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200125 n = n->rb_right;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200126 else
127 return iter;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200128 }
129
130 return NULL;
131}
132
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300133static void hists__match(struct hists *older, struct hists *newer)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200134{
135 struct rb_node *nd;
136
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300137 for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200138 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300139 pos->pair = hists__find_entry(older, pos);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200140 }
141}
142
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200143static int __cmd_diff(void)
144{
145 int ret, i;
146 struct perf_session *session[2];
147
Ian Munsie21ef97f2010-12-10 14:09:16 +1100148 session[0] = perf_session__new(input_old, O_RDONLY, force, false, &event_ops);
149 session[1] = perf_session__new(input_new, O_RDONLY, force, false, &event_ops);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200150 if (session[0] == NULL || session[1] == NULL)
151 return -ENOMEM;
152
153 for (i = 0; i < 2; ++i) {
154 ret = perf_session__process_events(session[i], &event_ops);
155 if (ret)
156 goto out_delete;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200157 }
158
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300159 hists__output_resort(&session[1]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200160 if (show_displacement)
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300161 hists__set_positions(&session[0]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200162
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300163 hists__match(&session[0]->hists, &session[1]->hists);
164 hists__fprintf(&session[1]->hists, &session[0]->hists,
165 show_displacement, stdout);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200166out_delete:
167 for (i = 0; i < 2; ++i)
168 perf_session__delete(session[i]);
169 return ret;
170}
171
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200172static const char * const diff_usage[] = {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200173 "perf diff [<options>] [old_file] [new_file]",
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200174 NULL,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200175};
176
177static const struct option options[] = {
Ian Munsiec0555642010-04-13 18:37:33 +1000178 OPT_INCR('v', "verbose", &verbose,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200179 "be more verbose (show symbol address, etc)"),
Shawn Bohrer34295552010-11-30 19:57:11 -0600180 OPT_BOOLEAN('M', "displacement", &show_displacement,
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200181 "Show position displacement relative to baseline"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200182 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
183 "dump raw trace in ASCII"),
184 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
185 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
186 "load module symbols - WARNING: use only with -k and LIVE kernel"),
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -0200187 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
188 "only consider symbols in these dsos"),
189 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
190 "only consider symbols in these comms"),
191 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
192 "only consider these symbols"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200193 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
194 "sort by key(s): pid, comm, dso, symbol, parent"),
195 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
196 "separator for columns, no spaces will be added between "
197 "columns '.' is reserved."),
David Ahernec5761e2010-12-09 13:27:07 -0700198 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
199 "Look for files with symbols relative to this directory"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200200 OPT_END()
201};
202
203int cmd_diff(int argc, const char **argv, const char *prefix __used)
204{
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -0200205 sort_order = diff__default_sort_order;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200206 argc = parse_options(argc, argv, options, diff_usage, 0);
207 if (argc) {
208 if (argc > 2)
209 usage_with_options(diff_usage, options);
210 if (argc == 2) {
211 input_old = argv[0];
212 input_new = argv[1];
213 } else
214 input_new = argv[0];
Zhang, Yanmina1645ce2010-04-19 13:32:50 +0800215 } else if (symbol_conf.default_guest_vmlinux_name ||
216 symbol_conf.default_guest_kallsyms) {
217 input_old = "perf.data.host";
218 input_new = "perf.data.guest";
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200219 }
220
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200221 symbol_conf.exclude_other = false;
Arnaldo Carvalho de Melo655000e2009-12-15 20:04:40 -0200222 if (symbol__init() < 0)
223 return -1;
224
225 setup_sorting(diff_usage, options);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200226 setup_pager();
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200227
228 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
229 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
230 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
231
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200232 return __cmd_diff();
233}