0822149dc7683c590bc3aaadfb231421513fb840
[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(event_t *event,
34                                       struct perf_sample *sample,
35                                       struct perf_session *session)
36 {
37         struct addr_location al;
38
39         if (event__preprocess_sample(event, session, &al, sample, NULL) < 0) {
40                 pr_warning("problem processing %d event, skipping it.\n",
41                            event->header.type);
42                 return -1;
43         }
44
45         if (al.filtered || al.sym == NULL)
46                 return 0;
47
48         if (hists__add_entry(&session->hists, &al, sample->period)) {
49                 pr_warning("problem incrementing symbol period, skipping event\n");
50                 return -1;
51         }
52
53         session->hists.stats.total_period += sample->period;
54         return 0;
55 }
56
57 static struct perf_event_ops event_ops = {
58         .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,
64         .ordered_samples = true,
65         .ordering_requires_timestamps = true,
66 };
67
68 static 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) {
76                 parent = *p;
77                 iter = rb_entry(parent, struct hist_entry, rb_node);
78                 if (hist_entry__cmp(he, iter) < 0)
79                         p = &(*p)->rb_left;
80                 else
81                         p = &(*p)->rb_right;
82         }
83
84         rb_link_node(&he->rb_node, parent, p);
85         rb_insert_color(&he->rb_node, root);
86 }
87
88 static void hists__resort_entries(struct hists *self)
89 {
90         unsigned long position = 1;
91         struct rb_root tmp = RB_ROOT;
92         struct rb_node *next = rb_first(&self->entries);
93
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);
98                 rb_erase(&n->rb_node, &self->entries);
99                 n->position = position++;
100                 perf_session__insert_hist_entry_by_name(&tmp, n);
101         }
102
103         self->entries = tmp;
104 }
105
106 static void hists__set_positions(struct hists *self)
107 {
108         hists__output_resort(self);
109         hists__resort_entries(self);
110 }
111
112 static struct hist_entry *hists__find_entry(struct hists *self,
113                                             struct hist_entry *he)
114 {
115         struct rb_node *n = self->entries.rb_node;
116
117         while (n) {
118                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
119                 int64_t cmp = hist_entry__cmp(he, iter);
120
121                 if (cmp < 0)
122                         n = n->rb_left;
123                 else if (cmp > 0)
124                         n = n->rb_right;
125                 else 
126                         return iter;
127         }
128
129         return NULL;
130 }
131
132 static void hists__match(struct hists *older, struct hists *newer)
133 {
134         struct rb_node *nd;
135
136         for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
137                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
138                 pos->pair = hists__find_entry(older, pos);
139         }
140 }
141
142 static int __cmd_diff(void)
143 {
144         int ret, i;
145         struct perf_session *session[2];
146
147         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);
149         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;
156         }
157
158         hists__output_resort(&session[1]->hists);
159         if (show_displacement)
160                 hists__set_positions(&session[0]->hists);
161
162         hists__match(&session[0]->hists, &session[1]->hists);
163         hists__fprintf(&session[1]->hists, &session[0]->hists,
164                        show_displacement, stdout);
165 out_delete:
166         for (i = 0; i < 2; ++i)
167                 perf_session__delete(session[i]);
168         return ret;
169 }
170
171 static const char * const diff_usage[] = {
172         "perf diff [<options>] [old_file] [new_file]",
173         NULL,
174 };
175
176 static const struct option options[] = {
177         OPT_INCR('v', "verbose", &verbose,
178                     "be more verbose (show symbol address, etc)"),
179         OPT_BOOLEAN('M', "displacement", &show_displacement,
180                     "Show position displacement relative to baseline"),
181         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"),
186         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"),
192         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."),
197         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
198                     "Look for files with symbols relative to this directory"),
199         OPT_END()
200 };
201
202 int cmd_diff(int argc, const char **argv, const char *prefix __used)
203 {
204         sort_order = diff__default_sort_order;
205         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];
214         } 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";
218         }
219
220         symbol_conf.exclude_other = false;
221         if (symbol__init() < 0)
222                 return -1;
223
224         setup_sorting(diff_usage, options);
225         setup_pager();
226
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
231         return __cmd_diff();
232 }