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";
21 static char diff__default_sort_order
[] = "dso,symbol";
23 static bool show_displacement
;
25 static int perf_session__add_hist_entry(struct perf_session
*self
,
26 struct addr_location
*al
, u64 count
)
29 struct hist_entry
*he
= __perf_session__add_hist_entry(self
, al
, NULL
,
40 static int diff__process_sample_event(event_t
*event
, struct perf_session
*session
)
42 struct addr_location al
;
43 struct sample_data data
= { .period
= 1, };
45 dump_printf("(IP, %d): %d: %#Lx\n", event
->header
.misc
,
46 event
->ip
.pid
, event
->ip
.ip
);
48 if (event__preprocess_sample(event
, session
, &al
, NULL
) < 0) {
49 pr_warning("problem processing %d event, skipping it.\n",
54 if (al
.filtered
|| al
.sym
== NULL
)
57 event__parse_sample(event
, session
->sample_type
, &data
);
59 if (perf_session__add_hist_entry(session
, &al
, data
.period
)) {
60 pr_warning("problem incrementing symbol count, skipping event\n");
64 session
->events_stats
.total
+= data
.period
;
68 static struct perf_event_ops event_ops
= {
69 .sample
= diff__process_sample_event
,
70 .mmap
= event__process_mmap
,
71 .comm
= event__process_comm
,
72 .exit
= event__process_task
,
73 .fork
= event__process_task
,
74 .lost
= event__process_lost
,
77 static void perf_session__insert_hist_entry_by_name(struct rb_root
*root
,
78 struct hist_entry
*he
)
80 struct rb_node
**p
= &root
->rb_node
;
81 struct rb_node
*parent
= NULL
;
82 struct hist_entry
*iter
;
86 iter
= rb_entry(parent
, struct hist_entry
, rb_node
);
87 if (hist_entry__cmp(he
, iter
) < 0)
93 rb_link_node(&he
->rb_node
, parent
, p
);
94 rb_insert_color(&he
->rb_node
, root
);
97 static void perf_session__resort_hist_entries(struct perf_session
*self
)
99 unsigned long position
= 1;
100 struct rb_root tmp
= RB_ROOT
;
101 struct rb_node
*next
= rb_first(&self
->hists
);
103 while (next
!= NULL
) {
104 struct hist_entry
*n
= rb_entry(next
, struct hist_entry
, rb_node
);
106 next
= rb_next(&n
->rb_node
);
107 rb_erase(&n
->rb_node
, &self
->hists
);
108 n
->position
= position
++;
109 perf_session__insert_hist_entry_by_name(&tmp
, n
);
115 static void perf_session__set_hist_entries_positions(struct perf_session
*self
)
117 perf_session__output_resort(self
, self
->events_stats
.total
);
118 perf_session__resort_hist_entries(self
);
121 static struct hist_entry
*
122 perf_session__find_hist_entry(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 int64_t cmp
= hist_entry__cmp(he
, iter
);
142 static void perf_session__match_hists(struct perf_session
*old_session
,
143 struct perf_session
*new_session
)
147 for (nd
= rb_first(&new_session
->hists
); nd
; nd
= rb_next(nd
)) {
148 struct hist_entry
*pos
= rb_entry(nd
, struct hist_entry
, rb_node
);
149 pos
->pair
= perf_session__find_hist_entry(old_session
, pos
);
153 static int __cmd_diff(void)
156 struct perf_session
*session
[2];
158 session
[0] = perf_session__new(input_old
, O_RDONLY
, force
);
159 session
[1] = perf_session__new(input_new
, O_RDONLY
, force
);
160 if (session
[0] == NULL
|| session
[1] == NULL
)
163 for (i
= 0; i
< 2; ++i
) {
164 ret
= perf_session__process_events(session
[i
], &event_ops
);
169 perf_session__output_resort(session
[1], session
[1]->events_stats
.total
);
170 if (show_displacement
)
171 perf_session__set_hist_entries_positions(session
[0]);
173 perf_session__match_hists(session
[0], session
[1]);
174 perf_session__fprintf_hists(session
[1], session
[0],
175 show_displacement
, stdout
);
177 for (i
= 0; i
< 2; ++i
)
178 perf_session__delete(session
[i
]);
182 static const char * const diff_usage
[] = {
183 "perf diff [<options>] [old_file] [new_file]",
187 static const struct option options
[] = {
188 OPT_BOOLEAN('v', "verbose", &verbose
,
189 "be more verbose (show symbol address, etc)"),
190 OPT_BOOLEAN('m', "displacement", &show_displacement
,
191 "Show position displacement relative to baseline"),
192 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace
,
193 "dump raw trace in ASCII"),
194 OPT_BOOLEAN('f', "force", &force
, "don't complain, do it"),
195 OPT_BOOLEAN('m', "modules", &symbol_conf
.use_modules
,
196 "load module symbols - WARNING: use only with -k and LIVE kernel"),
197 OPT_BOOLEAN('P', "full-paths", &symbol_conf
.full_paths
,
198 "Don't shorten the pathnames taking into account the cwd"),
199 OPT_STRING('d', "dsos", &symbol_conf
.dso_list_str
, "dso[,dso...]",
200 "only consider symbols in these dsos"),
201 OPT_STRING('C', "comms", &symbol_conf
.comm_list_str
, "comm[,comm...]",
202 "only consider symbols in these comms"),
203 OPT_STRING('S', "symbols", &symbol_conf
.sym_list_str
, "symbol[,symbol...]",
204 "only consider these symbols"),
205 OPT_STRING('s', "sort", &sort_order
, "key[,key2...]",
206 "sort by key(s): pid, comm, dso, symbol, parent"),
207 OPT_STRING('t', "field-separator", &symbol_conf
.field_sep
, "separator",
208 "separator for columns, no spaces will be added between "
209 "columns '.' is reserved."),
213 int cmd_diff(int argc
, const char **argv
, const char *prefix __used
)
215 sort_order
= diff__default_sort_order
;
216 argc
= parse_options(argc
, argv
, options
, diff_usage
, 0);
219 usage_with_options(diff_usage
, options
);
227 symbol_conf
.exclude_other
= false;
228 if (symbol__init() < 0)
231 setup_sorting(diff_usage
, options
);
234 sort_entry__setup_elide(&sort_dso
, symbol_conf
.dso_list
, "dso", NULL
);
235 sort_entry__setup_elide(&sort_comm
, symbol_conf
.comm_list
, "comm", NULL
);
236 sort_entry__setup_elide(&sort_sym
, symbol_conf
.sym_list
, "symbol", NULL
);