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.
9 #include "util/debug.h"
10 #include "util/event.h"
11 #include "util/hist.h"
12 #include "util/evsel.h"
13 #include "util/evlist.h"
14 #include "util/session.h"
15 #include "util/tool.h"
16 #include "util/sort.h"
17 #include "util/symbol.h"
18 #include "util/util.h"
22 static char const *input_old
= "perf.data.old",
23 *input_new
= "perf.data";
24 static char diff__default_sort_order
[] = "dso,symbol";
26 static bool show_displacement
;
28 static int hists__add_entry(struct hists
*self
,
29 struct addr_location
*al
, u64 period
)
31 if (__hists__add_entry(self
, al
, NULL
, period
) != NULL
)
36 static int diff__process_sample_event(struct perf_tool
*tool __maybe_unused
,
37 union perf_event
*event
,
38 struct perf_sample
*sample
,
39 struct perf_evsel
*evsel
,
40 struct machine
*machine
)
42 struct addr_location al
;
44 if (perf_event__preprocess_sample(event
, machine
, &al
, sample
, NULL
) < 0) {
45 pr_warning("problem processing %d event, skipping it.\n",
50 if (al
.filtered
|| al
.sym
== NULL
)
53 if (hists__add_entry(&evsel
->hists
, &al
, sample
->period
)) {
54 pr_warning("problem incrementing symbol period, skipping event\n");
58 evsel
->hists
.stats
.total_period
+= sample
->period
;
62 static struct perf_tool tool
= {
63 .sample
= diff__process_sample_event
,
64 .mmap
= perf_event__process_mmap
,
65 .comm
= perf_event__process_comm
,
66 .exit
= perf_event__process_task
,
67 .fork
= perf_event__process_task
,
68 .lost
= perf_event__process_lost
,
69 .ordered_samples
= true,
70 .ordering_requires_timestamps
= true,
73 static void insert_hist_entry_by_name(struct rb_root
*root
,
74 struct hist_entry
*he
)
76 struct rb_node
**p
= &root
->rb_node
;
77 struct rb_node
*parent
= NULL
;
78 struct hist_entry
*iter
;
82 iter
= rb_entry(parent
, struct hist_entry
, rb_node
);
83 if (hist_entry__cmp(he
, iter
) < 0)
89 rb_link_node(&he
->rb_node
, parent
, p
);
90 rb_insert_color(&he
->rb_node
, root
);
93 static void hists__name_resort(struct hists
*self
, bool sort
)
95 unsigned long position
= 1;
96 struct rb_root tmp
= RB_ROOT
;
97 struct rb_node
*next
= rb_first(&self
->entries
);
99 while (next
!= NULL
) {
100 struct hist_entry
*n
= rb_entry(next
, struct hist_entry
, rb_node
);
102 next
= rb_next(&n
->rb_node
);
103 n
->position
= position
++;
106 rb_erase(&n
->rb_node
, &self
->entries
);
107 insert_hist_entry_by_name(&tmp
, n
);
115 static struct hist_entry
*hists__find_entry(struct hists
*self
,
116 struct hist_entry
*he
)
118 struct rb_node
*n
= self
->entries
.rb_node
;
121 struct hist_entry
*iter
= rb_entry(n
, struct hist_entry
, rb_node
);
122 int64_t cmp
= hist_entry__cmp(he
, iter
);
135 static void hists__match(struct hists
*older
, struct hists
*newer
)
139 for (nd
= rb_first(&newer
->entries
); nd
; nd
= rb_next(nd
)) {
140 struct hist_entry
*pos
= rb_entry(nd
, struct hist_entry
, rb_node
);
141 pos
->pair
= hists__find_entry(older
, pos
);
145 static struct perf_evsel
*evsel_match(struct perf_evsel
*evsel
,
146 struct perf_evlist
*evlist
)
148 struct perf_evsel
*e
;
150 list_for_each_entry(e
, &evlist
->entries
, node
)
151 if (perf_evsel__match2(evsel
, e
))
157 static void perf_evlist__resort_hists(struct perf_evlist
*evlist
, bool name
)
159 struct perf_evsel
*evsel
;
161 list_for_each_entry(evsel
, &evlist
->entries
, node
) {
162 struct hists
*hists
= &evsel
->hists
;
164 hists__output_resort(hists
);
167 * The hists__name_resort only sets possition
170 if (name
|| ((!name
) && show_displacement
))
171 hists__name_resort(hists
, name
);
175 static int __cmd_diff(void)
178 #define older (session[0])
179 #define newer (session[1])
180 struct perf_session
*session
[2];
181 struct perf_evlist
*evlist_new
, *evlist_old
;
182 struct perf_evsel
*evsel
;
185 older
= perf_session__new(input_old
, O_RDONLY
, force
, false,
187 newer
= perf_session__new(input_new
, O_RDONLY
, force
, false,
189 if (session
[0] == NULL
|| session
[1] == NULL
)
192 for (i
= 0; i
< 2; ++i
) {
193 ret
= perf_session__process_events(session
[i
], &tool
);
198 evlist_old
= older
->evlist
;
199 evlist_new
= newer
->evlist
;
201 perf_evlist__resort_hists(evlist_old
, true);
202 perf_evlist__resort_hists(evlist_new
, false);
204 list_for_each_entry(evsel
, &evlist_new
->entries
, node
) {
205 struct perf_evsel
*evsel_old
;
207 evsel_old
= evsel_match(evsel
, evlist_old
);
211 fprintf(stdout
, "%s# Event '%s'\n#\n", first
? "" : "\n",
212 perf_evsel__name(evsel
));
216 hists__match(&evsel_old
->hists
, &evsel
->hists
);
217 hists__fprintf(&evsel
->hists
, true, 0, 0, stdout
);
221 for (i
= 0; i
< 2; ++i
)
222 perf_session__delete(session
[i
]);
228 static const char * const diff_usage
[] = {
229 "perf diff [<options>] [old_file] [new_file]",
233 static const struct option options
[] = {
234 OPT_INCR('v', "verbose", &verbose
,
235 "be more verbose (show symbol address, etc)"),
236 OPT_BOOLEAN('M', "displacement", &show_displacement
,
237 "Show position displacement relative to baseline"),
238 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace
,
239 "dump raw trace in ASCII"),
240 OPT_BOOLEAN('f', "force", &force
, "don't complain, do it"),
241 OPT_BOOLEAN('m', "modules", &symbol_conf
.use_modules
,
242 "load module symbols - WARNING: use only with -k and LIVE kernel"),
243 OPT_STRING('d', "dsos", &symbol_conf
.dso_list_str
, "dso[,dso...]",
244 "only consider symbols in these dsos"),
245 OPT_STRING('C', "comms", &symbol_conf
.comm_list_str
, "comm[,comm...]",
246 "only consider symbols in these comms"),
247 OPT_STRING('S', "symbols", &symbol_conf
.sym_list_str
, "symbol[,symbol...]",
248 "only consider these symbols"),
249 OPT_STRING('s', "sort", &sort_order
, "key[,key2...]",
250 "sort by key(s): pid, comm, dso, symbol, parent"),
251 OPT_STRING('t', "field-separator", &symbol_conf
.field_sep
, "separator",
252 "separator for columns, no spaces will be added between "
253 "columns '.' is reserved."),
254 OPT_STRING(0, "symfs", &symbol_conf
.symfs
, "directory",
255 "Look for files with symbols relative to this directory"),
259 static void ui_init(void)
263 /* No overhead column. */
264 perf_hpp__column_enable(PERF_HPP__OVERHEAD
, false);
266 /* Display baseline/delta/displacement columns. */
267 perf_hpp__column_enable(PERF_HPP__BASELINE
, true);
268 perf_hpp__column_enable(PERF_HPP__DELTA
, true);
270 if (show_displacement
)
271 perf_hpp__column_enable(PERF_HPP__DISPL
, true);
274 int cmd_diff(int argc
, const char **argv
, const char *prefix __maybe_unused
)
276 sort_order
= diff__default_sort_order
;
277 argc
= parse_options(argc
, argv
, options
, diff_usage
, 0);
280 usage_with_options(diff_usage
, options
);
286 } else if (symbol_conf
.default_guest_vmlinux_name
||
287 symbol_conf
.default_guest_kallsyms
) {
288 input_old
= "perf.data.host";
289 input_new
= "perf.data.guest";
292 symbol_conf
.exclude_other
= false;
293 if (symbol__init() < 0)
298 setup_sorting(diff_usage
, options
);
301 sort_entry__setup_elide(&sort_dso
, symbol_conf
.dso_list
, "dso", NULL
);
302 sort_entry__setup_elide(&sort_comm
, symbol_conf
.comm_list
, "comm", NULL
);
303 sort_entry__setup_elide(&sort_sym
, symbol_conf
.sym_list
, "symbol", NULL
);