blob: 5e1a043aae038154c5c27a1199d753a8f1f019c0 [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,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020064};
65
66static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
67 struct hist_entry *he)
68{
69 struct rb_node **p = &root->rb_node;
70 struct rb_node *parent = NULL;
71 struct hist_entry *iter;
72
73 while (*p != NULL) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020074 parent = *p;
75 iter = rb_entry(parent, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020076 if (hist_entry__cmp(he, iter) < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020077 p = &(*p)->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -020078 else
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020079 p = &(*p)->rb_right;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020080 }
81
82 rb_link_node(&he->rb_node, parent, p);
83 rb_insert_color(&he->rb_node, root);
84}
85
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030086static void hists__resort_entries(struct hists *self)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020087{
88 unsigned long position = 1;
89 struct rb_root tmp = RB_ROOT;
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030090 struct rb_node *next = rb_first(&self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020091
92 while (next != NULL) {
93 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
94
95 next = rb_next(&n->rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -030096 rb_erase(&n->rb_node, &self->entries);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -020097 n->position = position++;
98 perf_session__insert_hist_entry_by_name(&tmp, n);
99 }
100
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300101 self->entries = tmp;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200102}
103
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300104static void hists__set_positions(struct hists *self)
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200105{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300106 hists__output_resort(self);
107 hists__resort_entries(self);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200108}
109
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300110static struct hist_entry *hists__find_entry(struct hists *self,
111 struct hist_entry *he)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200112{
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300113 struct rb_node *n = self->entries.rb_node;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200114
115 while (n) {
116 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200117 int64_t cmp = hist_entry__cmp(he, iter);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200118
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200119 if (cmp < 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200120 n = n->rb_left;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200121 else if (cmp > 0)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200122 n = n->rb_right;
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200123 else
124 return iter;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200125 }
126
127 return NULL;
128}
129
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300130static void hists__match(struct hists *older, struct hists *newer)
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200131{
132 struct rb_node *nd;
133
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300134 for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200135 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300136 pos->pair = hists__find_entry(older, pos);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200137 }
138}
139
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200140static int __cmd_diff(void)
141{
142 int ret, i;
143 struct perf_session *session[2];
144
Tom Zanussi454c4072010-05-01 01:41:20 -0500145 session[0] = perf_session__new(input_old, O_RDONLY, force, false);
146 session[1] = perf_session__new(input_new, O_RDONLY, force, false);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200147 if (session[0] == NULL || session[1] == NULL)
148 return -ENOMEM;
149
150 for (i = 0; i < 2; ++i) {
151 ret = perf_session__process_events(session[i], &event_ops);
152 if (ret)
153 goto out_delete;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200154 }
155
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300156 hists__output_resort(&session[1]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200157 if (show_displacement)
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300158 hists__set_positions(&session[0]->hists);
Arnaldo Carvalho de Melo9c443df2009-12-28 22:48:36 -0200159
Arnaldo Carvalho de Melo1c02c4d2010-05-10 13:04:11 -0300160 hists__match(&session[0]->hists, &session[1]->hists);
161 hists__fprintf(&session[1]->hists, &session[0]->hists,
162 show_displacement, stdout);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200163out_delete:
164 for (i = 0; i < 2; ++i)
165 perf_session__delete(session[i]);
166 return ret;
167}
168
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200169static const char * const diff_usage[] = {
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200170 "perf diff [<options>] [old_file] [new_file]",
Arnaldo Carvalho de Melo0422a4f2009-12-18 16:35:58 -0200171 NULL,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200172};
173
174static const struct option options[] = {
Ian Munsiec0555642010-04-13 18:37:33 +1000175 OPT_INCR('v', "verbose", &verbose,
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200176 "be more verbose (show symbol address, etc)"),
Shawn Bohrer34295552010-11-30 19:57:11 -0600177 OPT_BOOLEAN('M', "displacement", &show_displacement,
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200178 "Show position displacement relative to baseline"),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200179 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
180 "dump raw trace in ASCII"),
181 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
182 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
183 "load module symbols - WARNING: use only with -k and LIVE kernel"),
Arnaldo Carvalho de Meloc410a332009-12-15 20:04:41 -0200184 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
185 "only consider symbols in these dsos"),
186 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
187 "only consider symbols in these comms"),
188 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
189 "only consider these symbols"),
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200190 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
191 "sort by key(s): pid, comm, dso, symbol, parent"),
192 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
193 "separator for columns, no spaces will be added between "
194 "columns '.' is reserved."),
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200195 OPT_END()
196};
197
198int cmd_diff(int argc, const char **argv, const char *prefix __used)
199{
Arnaldo Carvalho de Melo604c5c92009-12-16 14:09:53 -0200200 sort_order = diff__default_sort_order;
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200201 argc = parse_options(argc, argv, options, diff_usage, 0);
202 if (argc) {
203 if (argc > 2)
204 usage_with_options(diff_usage, options);
205 if (argc == 2) {
206 input_old = argv[0];
207 input_new = argv[1];
208 } else
209 input_new = argv[0];
Zhang, Yanmina1645ce2010-04-19 13:32:50 +0800210 } else if (symbol_conf.default_guest_vmlinux_name ||
211 symbol_conf.default_guest_kallsyms) {
212 input_old = "perf.data.host";
213 input_new = "perf.data.guest";
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200214 }
215
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200216 symbol_conf.exclude_other = false;
Arnaldo Carvalho de Melo655000e2009-12-15 20:04:40 -0200217 if (symbol__init() < 0)
218 return -1;
219
220 setup_sorting(diff_usage, options);
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200221 setup_pager();
Arnaldo Carvalho de Meloc351c282009-12-16 13:49:27 -0200222
223 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
224 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
225 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
226
Arnaldo Carvalho de Melo86a9eee2009-12-14 20:09:31 -0200227 return __cmd_diff();
228}