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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 | } |
234 |
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