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7#include "builtin.h"
8
9#include "util/debug.h"
10#include "util/event.h"
11#include "util/hist.h"
12#include "util/evsel.h"
13#include "util/session.h"
14#include "util/tool.h"
15#include "util/sort.h"
16#include "util/symbol.h"
17#include "util/util.h"
18
19#include <stdlib.h>
20
21static char const *input_old = "perf.data.old",
22 *input_new = "perf.data";
23static char diff__default_sort_order[] = "dso,symbol";
24static bool force;
25static bool show_displacement;
26
27static int hists__add_entry(struct hists *self,
28 struct addr_location *al, u64 period)
29{
30 if (__hists__add_entry(self, al, NULL, period) != NULL)
31 return 0;
32 return -ENOMEM;
33}
34
35static int diff__process_sample_event(struct perf_tool *tool __used,
36 union perf_event *event,
37 struct perf_sample *sample,
38 struct perf_evsel *evsel __used,
39 struct machine *machine)
40{
41 struct addr_location al;
42
43 if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
44 pr_warning("problem processing %d event, skipping it.\n",
45 event->header.type);
46 return -1;
47 }
48
49 if (al.filtered || al.sym == NULL)
50 return 0;
51
52 if (hists__add_entry(&evsel->hists, &al, sample->period)) {
53 pr_warning("problem incrementing symbol period, skipping event\n");
54 return -1;
55 }
56
57 evsel->hists.stats.total_period += sample->period;
58 return 0;
59}
60
61static struct perf_tool perf_diff = {
62 .sample = diff__process_sample_event,
63 .mmap = perf_event__process_mmap,
64 .comm = perf_event__process_comm,
65 .exit = perf_event__process_task,
66 .fork = perf_event__process_task,
67 .lost = perf_event__process_lost,
68 .ordered_samples = true,
69 .ordering_requires_timestamps = true,
70};
71
72static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
73 struct hist_entry *he)
74{
75 struct rb_node **p = &root->rb_node;
76 struct rb_node *parent = NULL;
77 struct hist_entry *iter;
78
79 while (*p != NULL) {
80 parent = *p;
81 iter = rb_entry(parent, struct hist_entry, rb_node);
82 if (hist_entry__cmp(he, iter) < 0)
83 p = &(*p)->rb_left;
84 else
85 p = &(*p)->rb_right;
86 }
87
88 rb_link_node(&he->rb_node, parent, p);
89 rb_insert_color(&he->rb_node, root);
90}
91
92static void hists__resort_entries(struct hists *self)
93{
94 unsigned long position = 1;
95 struct rb_root tmp = RB_ROOT;
96 struct rb_node *next = rb_first(&self->entries);
97
98 while (next != NULL) {
99 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
100
101 next = rb_next(&n->rb_node);
102 rb_erase(&n->rb_node, &self->entries);
103 n->position = position++;
104 perf_session__insert_hist_entry_by_name(&tmp, n);
105 }
106
107 self->entries = tmp;
108}
109
110static void hists__set_positions(struct hists *self)
111{
112 hists__output_resort(self);
113 hists__resort_entries(self);
114}
115
116static struct hist_entry *hists__find_entry(struct hists *self,
117 struct hist_entry *he)
118{
119 struct rb_node *n = self->entries.rb_node;
120
121 while (n) {
122 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
123 int64_t cmp = hist_entry__cmp(he, iter);
124
125 if (cmp < 0)
126 n = n->rb_left;
127 else if (cmp > 0)
128 n = n->rb_right;
129 else
130 return iter;
131 }
132
133 return NULL;
134}
135
136static void hists__match(struct hists *older, struct hists *newer)
137{
138 struct rb_node *nd;
139
140 for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
141 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
142 pos->pair = hists__find_entry(older, pos);
143 }
144}
145
146static int __cmd_diff(void)
147{
148 int ret, i;
149 struct perf_session *session[2];
150
151 session[0] = perf_session__new(input_old, O_RDONLY, force, false, &perf_diff);
152 session[1] = perf_session__new(input_new, O_RDONLY, force, false, &perf_diff);
153 if (session[0] == NULL || session[1] == NULL)
154 return -ENOMEM;
155
156 for (i = 0; i < 2; ++i) {
157 ret = perf_session__process_events(session[i], &perf_diff);
158 if (ret)
159 goto out_delete;
160 }
161
162 hists__output_resort(&session[1]->hists);
163 if (show_displacement)
164 hists__set_positions(&session[0]->hists);
165
166 hists__match(&session[0]->hists, &session[1]->hists);
167 hists__fprintf(&session[1]->hists, &session[0]->hists,
168 show_displacement, true, 0, 0, stdout);
169out_delete:
170 for (i = 0; i < 2; ++i)
171 perf_session__delete(session[i]);
172 return ret;
173}
174
175static const char * const diff_usage[] = {
176 "perf diff [<options>] [old_file] [new_file]",
177 NULL,
178};
179
180static const struct option options[] = {
181 OPT_INCR('v', "verbose", &verbose,
182 "be more verbose (show symbol address, etc)"),
183 OPT_BOOLEAN('M', "displacement", &show_displacement,
184 "Show position displacement relative to baseline"),
185 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
186 "dump raw trace in ASCII"),
187 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
188 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
189 "load module symbols - WARNING: use only with -k and LIVE kernel"),
190 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
191 "only consider symbols in these dsos"),
192 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
193 "only consider symbols in these comms"),
194 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
195 "only consider these symbols"),
196 OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
197 "sort by key(s): pid, comm, dso, symbol, parent"),
198 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
199 "separator for columns, no spaces will be added between "
200 "columns '.' is reserved."),
201 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
202 "Look for files with symbols relative to this directory"),
203 OPT_END()
204};
205
206int cmd_diff(int argc, const char **argv, const char *prefix __used)
207{
208 sort_order = diff__default_sort_order;
209 argc = parse_options(argc, argv, options, diff_usage, 0);
210 if (argc) {
211 if (argc > 2)
212 usage_with_options(diff_usage, options);
213 if (argc == 2) {
214 input_old = argv[0];
215 input_new = argv[1];
216 } else
217 input_new = argv[0];
218 } else if (symbol_conf.default_guest_vmlinux_name ||
219 symbol_conf.default_guest_kallsyms) {
220 input_old = "perf.data.host";
221 input_new = "perf.data.guest";
222 }
223
224 symbol_conf.exclude_other = false;
225 if (symbol__init() < 0)
226 return -1;
227
228 setup_sorting(diff_usage, options);
229 setup_pager();
230
231 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
232 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
233 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
234
235 return __cmd_diff();
236}
237
