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/session.h"
14 #include "util/tool.h"
15 #include "util/sort.h"
16 #include "util/symbol.h"
17 #include "util/util.h"
21 static char const *input_old
= "perf.data.old",
22 *input_new
= "perf.data";
23 static char diff__default_sort_order
[] = "dso,symbol";
25 static bool show_displacement
;
28 struct perf_tool tool
;
29 struct perf_session
*session
;
32 static int hists__add_entry(struct hists
*self
,
33 struct addr_location
*al
, u64 period
)
35 if (__hists__add_entry(self
, al
, NULL
, period
) != NULL
)
40 static int diff__process_sample_event(struct perf_tool
*tool
,
41 union perf_event
*event
,
42 struct perf_sample
*sample
,
43 struct perf_evsel
*evsel __used
,
44 struct machine
*machine
)
46 struct perf_diff
*_diff
= container_of(tool
, struct perf_diff
, tool
);
47 struct perf_session
*session
= _diff
->session
;
48 struct addr_location al
;
50 if (perf_event__preprocess_sample(event
, machine
, &al
, sample
, NULL
) < 0) {
51 pr_warning("problem processing %d event, skipping it.\n",
56 if (al
.filtered
|| al
.sym
== NULL
)
59 if (hists__add_entry(&session
->hists
, &al
, sample
->period
)) {
60 pr_warning("problem incrementing symbol period, skipping event\n");
64 session
->hists
.stats
.total_period
+= sample
->period
;
68 static struct perf_diff diff
= {
70 .sample
= diff__process_sample_event
,
71 .mmap
= perf_event__process_mmap
,
72 .comm
= perf_event__process_comm
,
73 .exit
= perf_event__process_task
,
74 .fork
= perf_event__process_task
,
75 .lost
= perf_event__process_lost
,
76 .ordered_samples
= true,
77 .ordering_requires_timestamps
= true,
81 static void perf_session__insert_hist_entry_by_name(struct rb_root
*root
,
82 struct hist_entry
*he
)
84 struct rb_node
**p
= &root
->rb_node
;
85 struct rb_node
*parent
= NULL
;
86 struct hist_entry
*iter
;
90 iter
= rb_entry(parent
, struct hist_entry
, rb_node
);
91 if (hist_entry__cmp(he
, iter
) < 0)
97 rb_link_node(&he
->rb_node
, parent
, p
);
98 rb_insert_color(&he
->rb_node
, root
);
101 static void hists__resort_entries(struct hists
*self
)
103 unsigned long position
= 1;
104 struct rb_root tmp
= RB_ROOT
;
105 struct rb_node
*next
= rb_first(&self
->entries
);
107 while (next
!= NULL
) {
108 struct hist_entry
*n
= rb_entry(next
, struct hist_entry
, rb_node
);
110 next
= rb_next(&n
->rb_node
);
111 rb_erase(&n
->rb_node
, &self
->entries
);
112 n
->position
= position
++;
113 perf_session__insert_hist_entry_by_name(&tmp
, n
);
119 static struct hist_entry
*hists__find_entry(struct hists
*self
,
120 struct hist_entry
*he
)
122 struct rb_node
*n
= self
->entries
.rb_node
;
125 struct hist_entry
*iter
= rb_entry(n
, struct hist_entry
, rb_node
);
126 int64_t cmp
= hist_entry__cmp(he
, iter
);
139 static void hists__match(struct hists
*older
, struct hists
*newer
)
143 for (nd
= rb_first(&newer
->entries
); nd
; nd
= rb_next(nd
)) {
144 struct hist_entry
*pos
= rb_entry(nd
, struct hist_entry
, rb_node
);
145 pos
->pair
= hists__find_entry(older
, pos
);
149 static int __cmd_diff(void)
152 #define older (session[0])
153 #define newer (session[1])
154 struct perf_session
*session
[2];
156 older
= perf_session__new(input_old
, O_RDONLY
, force
, false,
158 newer
= perf_session__new(input_new
, O_RDONLY
, force
, false,
160 if (session
[0] == NULL
|| session
[1] == NULL
)
163 for (i
= 0; i
< 2; ++i
) {
164 diff
.session
= session
[i
];
165 ret
= perf_session__process_events(session
[i
], &diff
.tool
);
168 hists__output_resort(&session
[i
]->hists
);
171 if (show_displacement
)
172 hists__resort_entries(&older
->hists
);
174 hists__match(&older
->hists
, &newer
->hists
);
175 hists__fprintf(&newer
->hists
, &older
->hists
,
176 show_displacement
, true, 0, 0, stdout
);
178 for (i
= 0; i
< 2; ++i
)
179 perf_session__delete(session
[i
]);
185 static const char * const diff_usage
[] = {
186 "perf diff [<options>] [old_file] [new_file]",
190 static const struct option options
[] = {
191 OPT_INCR('v', "verbose", &verbose
,
192 "be more verbose (show symbol address, etc)"),
193 OPT_BOOLEAN('M', "displacement", &show_displacement
,
194 "Show position displacement relative to baseline"),
195 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace
,
196 "dump raw trace in ASCII"),
197 OPT_BOOLEAN('f', "force", &force
, "don't complain, do it"),
198 OPT_BOOLEAN('m', "modules", &symbol_conf
.use_modules
,
199 "load module symbols - WARNING: use only with -k and LIVE kernel"),
200 OPT_STRING('d', "dsos", &symbol_conf
.dso_list_str
, "dso[,dso...]",
201 "only consider symbols in these dsos"),
202 OPT_STRING('C', "comms", &symbol_conf
.comm_list_str
, "comm[,comm...]",
203 "only consider symbols in these comms"),
204 OPT_STRING('S', "symbols", &symbol_conf
.sym_list_str
, "symbol[,symbol...]",
205 "only consider these symbols"),
206 OPT_STRING('s', "sort", &sort_order
, "key[,key2...]",
207 "sort by key(s): pid, comm, dso, symbol, parent"),
208 OPT_STRING('t', "field-separator", &symbol_conf
.field_sep
, "separator",
209 "separator for columns, no spaces will be added between "
210 "columns '.' is reserved."),
211 OPT_STRING(0, "symfs", &symbol_conf
.symfs
, "directory",
212 "Look for files with symbols relative to this directory"),
216 int cmd_diff(int argc
, const char **argv
, const char *prefix __used
)
218 sort_order
= diff__default_sort_order
;
219 argc
= parse_options(argc
, argv
, options
, diff_usage
, 0);
222 usage_with_options(diff_usage
, options
);
228 } else if (symbol_conf
.default_guest_vmlinux_name
||
229 symbol_conf
.default_guest_kallsyms
) {
230 input_old
= "perf.data.host";
231 input_new
= "perf.data.guest";
234 symbol_conf
.exclude_other
= false;
235 if (symbol__init() < 0)
238 setup_sorting(diff_usage
, options
);
241 sort_entry__setup_elide(&sort_dso
, symbol_conf
.dso_list
, "dso", NULL
);
242 sort_entry__setup_elide(&sort_comm
, symbol_conf
.comm_list
, "comm", NULL
);
243 sort_entry__setup_elide(&sort_sym
, symbol_conf
.sym_list
, "symbol", NULL
);