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 hists__add_entry(struct hists
*self
,
26 struct addr_location
*al
, u64 period
)
28 if (__hists__add_entry(self
, al
, NULL
, period
) != NULL
)
33 static int diff__process_sample_event(event_t
*event
, struct perf_session
*session
)
35 struct addr_location al
;
36 struct sample_data data
= { .period
= 1, };
38 dump_printf("(IP, %d): %d: %#Lx\n", event
->header
.misc
,
39 event
->ip
.pid
, event
->ip
.ip
);
41 if (event__preprocess_sample(event
, session
, &al
, NULL
) < 0) {
42 pr_warning("problem processing %d event, skipping it.\n",
47 if (al
.filtered
|| al
.sym
== NULL
)
50 event__parse_sample(event
, session
->sample_type
, &data
);
52 if (hists__add_entry(&session
->hists
, &al
, data
.period
)) {
53 pr_warning("problem incrementing symbol period, skipping event\n");
57 session
->hists
.stats
.total_period
+= data
.period
;
61 static struct perf_event_ops event_ops
= {
62 .sample
= diff__process_sample_event
,
63 .mmap
= event__process_mmap
,
64 .comm
= event__process_comm
,
65 .exit
= event__process_task
,
66 .fork
= event__process_task
,
67 .lost
= event__process_lost
,
70 static void perf_session__insert_hist_entry_by_name(struct rb_root
*root
,
71 struct hist_entry
*he
)
73 struct rb_node
**p
= &root
->rb_node
;
74 struct rb_node
*parent
= NULL
;
75 struct hist_entry
*iter
;
79 iter
= rb_entry(parent
, struct hist_entry
, rb_node
);
80 if (hist_entry__cmp(he
, iter
) < 0)
86 rb_link_node(&he
->rb_node
, parent
, p
);
87 rb_insert_color(&he
->rb_node
, root
);
90 static void hists__resort_entries(struct hists
*self
)
92 unsigned long position
= 1;
93 struct rb_root tmp
= RB_ROOT
;
94 struct rb_node
*next
= rb_first(&self
->entries
);
96 while (next
!= NULL
) {
97 struct hist_entry
*n
= rb_entry(next
, struct hist_entry
, rb_node
);
99 next
= rb_next(&n
->rb_node
);
100 rb_erase(&n
->rb_node
, &self
->entries
);
101 n
->position
= position
++;
102 perf_session__insert_hist_entry_by_name(&tmp
, n
);
108 static void hists__set_positions(struct hists
*self
)
110 hists__output_resort(self
);
111 hists__resort_entries(self
);
114 static struct hist_entry
*hists__find_entry(struct hists
*self
,
115 struct hist_entry
*he
)
117 struct rb_node
*n
= self
->entries
.rb_node
;
120 struct hist_entry
*iter
= rb_entry(n
, struct hist_entry
, rb_node
);
121 int64_t cmp
= hist_entry__cmp(he
, iter
);
134 static void hists__match(struct hists
*older
, struct hists
*newer
)
138 for (nd
= rb_first(&newer
->entries
); nd
; nd
= rb_next(nd
)) {
139 struct hist_entry
*pos
= rb_entry(nd
, struct hist_entry
, rb_node
);
140 pos
->pair
= hists__find_entry(older
, pos
);
144 static int __cmd_diff(void)
147 struct perf_session
*session
[2];
149 session
[0] = perf_session__new(input_old
, O_RDONLY
, force
, false);
150 session
[1] = perf_session__new(input_new
, O_RDONLY
, force
, false);
151 if (session
[0] == NULL
|| session
[1] == NULL
)
154 for (i
= 0; i
< 2; ++i
) {
155 ret
= perf_session__process_events(session
[i
], &event_ops
);
160 hists__output_resort(&session
[1]->hists
);
161 if (show_displacement
)
162 hists__set_positions(&session
[0]->hists
);
164 hists__match(&session
[0]->hists
, &session
[1]->hists
);
165 hists__fprintf(&session
[1]->hists
, &session
[0]->hists
,
166 show_displacement
, stdout
);
168 for (i
= 0; i
< 2; ++i
)
169 perf_session__delete(session
[i
]);
173 static const char * const diff_usage
[] = {
174 "perf diff [<options>] [old_file] [new_file]",
178 static const struct option options
[] = {
179 OPT_INCR('v', "verbose", &verbose
,
180 "be more verbose (show symbol address, etc)"),
181 OPT_BOOLEAN('m', "displacement", &show_displacement
,
182 "Show position displacement relative to baseline"),
183 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace
,
184 "dump raw trace in ASCII"),
185 OPT_BOOLEAN('f', "force", &force
, "don't complain, do it"),
186 OPT_BOOLEAN('m', "modules", &symbol_conf
.use_modules
,
187 "load module symbols - WARNING: use only with -k and LIVE kernel"),
188 OPT_BOOLEAN('P', "full-paths", &symbol_conf
.full_paths
,
189 "Don't shorten the pathnames taking into account the cwd"),
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."),
204 int cmd_diff(int argc
, const char **argv
, const char *prefix __used
)
206 sort_order
= diff__default_sort_order
;
207 argc
= parse_options(argc
, argv
, options
, diff_usage
, 0);
210 usage_with_options(diff_usage
, options
);
216 } else if (symbol_conf
.default_guest_vmlinux_name
||
217 symbol_conf
.default_guest_kallsyms
) {
218 input_old
= "perf.data.host";
219 input_new
= "perf.data.guest";
222 symbol_conf
.exclude_other
= false;
223 if (symbol__init() < 0)
226 setup_sorting(diff_usage
, options
);
229 sort_entry__setup_elide(&sort_dso
, symbol_conf
.dso_list
, "dso", NULL
);
230 sort_entry__setup_elide(&sort_comm
, symbol_conf
.comm_list
, "comm", NULL
);
231 sort_entry__setup_elide(&sort_sym
, symbol_conf
.sym_list
, "symbol", NULL
);