perf probe: Warn when more than one line are given
[linux-2.6.git] / tools / perf / builtin-diff.c
1 /*
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
19 static char const *input_old = "perf.data.old",
20                   *input_new = "perf.data";
21 static char       diff__default_sort_order[] = "dso,symbol";
22 static bool  force;
23 static bool show_displacement;
24
25 static int hists__add_entry(struct hists *self,
26                             struct addr_location *al, u64 period)
27 {
28         if (__hists__add_entry(self, al, NULL, period) != NULL)
29                 return 0;
30         return -ENOMEM;
31 }
32
33 static int diff__process_sample_event(union perf_event *event,
34                                       struct perf_sample *sample,
35                                       struct perf_evsel *evsel __used,
36                                       struct perf_session *session)
37 {
38         struct addr_location al;
39
40         if (perf_event__preprocess_sample(event, session, &al, sample, NULL) < 0) {
41                 pr_warning("problem processing %d event, skipping it.\n",
42                            event->header.type);
43                 return -1;
44         }
45
46         if (al.filtered || al.sym == NULL)
47                 return 0;
48
49         if (hists__add_entry(&session->hists, &al, sample->period)) {
50                 pr_warning("problem incrementing symbol period, skipping event\n");
51                 return -1;
52         }
53
54         session->hists.stats.total_period += sample->period;
55         return 0;
56 }
57
58 static struct perf_event_ops event_ops = {
59         .sample = diff__process_sample_event,
60         .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,
65         .ordered_samples = true,
66         .ordering_requires_timestamps = true,
67 };
68
69 static 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) {
77                 parent = *p;
78                 iter = rb_entry(parent, struct hist_entry, rb_node);
79                 if (hist_entry__cmp(he, iter) < 0)
80                         p = &(*p)->rb_left;
81                 else
82                         p = &(*p)->rb_right;
83         }
84
85         rb_link_node(&he->rb_node, parent, p);
86         rb_insert_color(&he->rb_node, root);
87 }
88
89 static void hists__resort_entries(struct hists *self)
90 {
91         unsigned long position = 1;
92         struct rb_root tmp = RB_ROOT;
93         struct rb_node *next = rb_first(&self->entries);
94
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);
99                 rb_erase(&n->rb_node, &self->entries);
100                 n->position = position++;
101                 perf_session__insert_hist_entry_by_name(&tmp, n);
102         }
103
104         self->entries = tmp;
105 }
106
107 static void hists__set_positions(struct hists *self)
108 {
109         hists__output_resort(self);
110         hists__resort_entries(self);
111 }
112
113 static struct hist_entry *hists__find_entry(struct hists *self,
114                                             struct hist_entry *he)
115 {
116         struct rb_node *n = self->entries.rb_node;
117
118         while (n) {
119                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
120                 int64_t cmp = hist_entry__cmp(he, iter);
121
122                 if (cmp < 0)
123                         n = n->rb_left;
124                 else if (cmp > 0)
125                         n = n->rb_right;
126                 else 
127                         return iter;
128         }
129
130         return NULL;
131 }
132
133 static void hists__match(struct hists *older, struct hists *newer)
134 {
135         struct rb_node *nd;
136
137         for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
138                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
139                 pos->pair = hists__find_entry(older, pos);
140         }
141 }
142
143 static int __cmd_diff(void)
144 {
145         int ret, i;
146         struct perf_session *session[2];
147
148         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);
150         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;
157         }
158
159         hists__output_resort(&session[1]->hists);
160         if (show_displacement)
161                 hists__set_positions(&session[0]->hists);
162
163         hists__match(&session[0]->hists, &session[1]->hists);
164         hists__fprintf(&session[1]->hists, &session[0]->hists,
165                        show_displacement, stdout);
166 out_delete:
167         for (i = 0; i < 2; ++i)
168                 perf_session__delete(session[i]);
169         return ret;
170 }
171
172 static const char * const diff_usage[] = {
173         "perf diff [<options>] [old_file] [new_file]",
174         NULL,
175 };
176
177 static const struct option options[] = {
178         OPT_INCR('v', "verbose", &verbose,
179                     "be more verbose (show symbol address, etc)"),
180         OPT_BOOLEAN('M', "displacement", &show_displacement,
181                     "Show position displacement relative to baseline"),
182         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"),
187         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"),
193         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."),
198         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
199                     "Look for files with symbols relative to this directory"),
200         OPT_END()
201 };
202
203 int cmd_diff(int argc, const char **argv, const char *prefix __used)
204 {
205         sort_order = diff__default_sort_order;
206         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];
215         } 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";
219         }
220
221         symbol_conf.exclude_other = false;
222         if (symbol__init() < 0)
223                 return -1;
224
225         setup_sorting(diff_usage, options);
226         setup_pager();
227
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
232         return __cmd_diff();
233 }