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/session.h"
13 #include "util/sort.h"
14 #include "util/symbol.h"
15 #include "util/util.h"
19 static char const *input_old
= "perf.data.old",
20 *input_new
= "perf.data";
22 static bool show_percent
;
24 static int perf_session__add_hist_entry(struct perf_session
*self
,
25 struct addr_location
*al
, u64 count
)
28 struct hist_entry
*he
= __perf_session__add_hist_entry(self
, al
, NULL
,
39 static int diff__process_sample_event(event_t
*event
, struct perf_session
*session
)
41 struct addr_location al
;
42 struct sample_data data
= { .period
= 1, };
44 dump_printf("(IP, %d): %d: %p\n", event
->header
.misc
,
45 event
->ip
.pid
, (void *)(long)event
->ip
.ip
);
47 if (event__preprocess_sample(event
, session
, &al
, NULL
) < 0) {
48 pr_warning("problem processing %d event, skipping it.\n",
53 event__parse_sample(event
, session
->sample_type
, &data
);
55 if (al
.sym
&& perf_session__add_hist_entry(session
, &al
, data
.period
)) {
56 pr_warning("problem incrementing symbol count, skipping event\n");
60 session
->events_stats
.total
+= data
.period
;
64 static struct perf_event_ops event_ops
= {
65 .process_sample_event
= diff__process_sample_event
,
66 .process_mmap_event
= event__process_mmap
,
67 .process_comm_event
= event__process_comm
,
68 .process_exit_event
= event__process_task
,
69 .process_fork_event
= event__process_task
,
70 .process_lost_event
= event__process_lost
,
73 static void perf_session__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
;
83 iter
= rb_entry(parent
, struct hist_entry
, rb_node
);
85 cmp
= strcmp(he
->map
->dso
->name
, iter
->map
->dso
->name
);
91 cmp
= strcmp(he
->sym
->name
, iter
->sym
->name
);
99 rb_link_node(&he
->rb_node
, parent
, p
);
100 rb_insert_color(&he
->rb_node
, root
);
103 static void perf_session__resort_by_name(struct perf_session
*self
)
105 unsigned long position
= 1;
106 struct rb_root tmp
= RB_ROOT
;
107 struct rb_node
*next
= rb_first(&self
->hists
);
109 while (next
!= NULL
) {
110 struct hist_entry
*n
= rb_entry(next
, struct hist_entry
, rb_node
);
112 next
= rb_next(&n
->rb_node
);
113 rb_erase(&n
->rb_node
, &self
->hists
);
114 n
->position
= position
++;
115 perf_session__insert_hist_entry_by_name(&tmp
, n
);
121 static struct hist_entry
*
122 perf_session__find_hist_entry_by_name(struct perf_session
*self
,
123 struct hist_entry
*he
)
125 struct rb_node
*n
= self
->hists
.rb_node
;
128 struct hist_entry
*iter
= rb_entry(n
, struct hist_entry
, rb_node
);
129 int cmp
= strcmp(he
->map
->dso
->name
, iter
->map
->dso
->name
);
136 cmp
= strcmp(he
->sym
->name
, iter
->sym
->name
);
149 static void perf_session__match_hists(struct perf_session
*old_session
,
150 struct perf_session
*new_session
)
154 perf_session__resort_by_name(old_session
);
156 for (nd
= rb_first(&new_session
->hists
); nd
; nd
= rb_next(nd
)) {
157 struct hist_entry
*pos
= rb_entry(nd
, struct hist_entry
, rb_node
);
158 pos
->pair
= perf_session__find_hist_entry_by_name(old_session
, pos
);
162 static size_t hist_entry__fprintf_matched(struct hist_entry
*self
,
164 struct perf_session
*session
,
165 struct perf_session
*pair_session
,
169 char displacement
[16];
172 if (self
->pair
!= NULL
) {
173 long pdiff
= (long)self
->pair
->position
- (long)pos
;
174 old_count
= self
->pair
->count
;
177 snprintf(displacement
, sizeof(displacement
), "%+4ld", pdiff
);
179 blank
: memset(displacement
, ' ', sizeof(displacement
));
182 printed
= fprintf(fp
, "%4lu %5.5s ", pos
, displacement
);
185 double old_percent
= (old_count
* 100) / pair_session
->events_stats
.total
,
186 new_percent
= (self
->count
* 100) / session
->events_stats
.total
;
187 double diff
= old_percent
- new_percent
;
190 printed
+= fprintf(fp
, " %3.2f%% %3.2f%%", old_percent
, new_percent
);
193 printed
+= fprintf(fp
, " %+4.2F%%", diff
);
195 printed
+= fprintf(fp
, " ");
198 printed
+= fprintf(fp
, " %9Lu %9Lu", old_count
, self
->count
);
199 printed
+= fprintf(fp
, " %+9Ld", (s64
)self
->count
- (s64
)old_count
);
202 return printed
+ fprintf(fp
, " %25.25s %s\n",
203 self
->map
->dso
->name
, self
->sym
->name
);
206 static size_t perf_session__fprintf_matched_hists(struct perf_session
*self
,
207 struct perf_session
*pair
,
212 unsigned long pos
= 1;
214 for (nd
= rb_first(&self
->hists
); nd
; nd
= rb_next(nd
)) {
215 struct hist_entry
*he
= rb_entry(nd
, struct hist_entry
, rb_node
);
216 printed
+= hist_entry__fprintf_matched(he
, pos
++, self
, pair
, fp
);
222 static int __cmd_diff(void)
225 struct perf_session
*session
[2];
227 session
[0] = perf_session__new(input_old
, O_RDONLY
, force
);
228 session
[1] = perf_session__new(input_new
, O_RDONLY
, force
);
229 if (session
[0] == NULL
|| session
[1] == NULL
)
232 for (i
= 0; i
< 2; ++i
) {
233 ret
= perf_session__process_events(session
[i
], &event_ops
);
236 perf_session__output_resort(session
[i
], session
[i
]->events_stats
.total
);
239 perf_session__match_hists(session
[0], session
[1]);
240 perf_session__fprintf_matched_hists(session
[1], session
[0], stdout
);
242 for (i
= 0; i
< 2; ++i
)
243 perf_session__delete(session
[i
]);
247 static const char *const diff_usage
[] = {
248 "perf diff [<options>] [old_file] [new_file]",
251 static const struct option options
[] = {
252 OPT_BOOLEAN('v', "verbose", &verbose
,
253 "be more verbose (show symbol address, etc)"),
254 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace
,
255 "dump raw trace in ASCII"),
256 OPT_BOOLEAN('f', "force", &force
, "don't complain, do it"),
257 OPT_BOOLEAN('m', "modules", &symbol_conf
.use_modules
,
258 "load module symbols - WARNING: use only with -k and LIVE kernel"),
259 OPT_BOOLEAN('p', "percentages", &show_percent
,
260 "Don't shorten the pathnames taking into account the cwd"),
261 OPT_BOOLEAN('P', "full-paths", &event_ops
.full_paths
,
262 "Don't shorten the pathnames taking into account the cwd"),
266 int cmd_diff(int argc
, const char **argv
, const char *prefix __used
)
268 if (symbol__init() < 0)
271 setup_sorting(diff_usage
, options
);
273 argc
= parse_options(argc
, argv
, options
, diff_usage
, 0);
276 usage_with_options(diff_usage
, options
);