6 * Copyright (C) 2009, 2010 Red Hat Inc.
7 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
14 #include <linux/kernel.h>
22 static bool no_buildid_cache
;
24 int build_id__mark_dso_hit(struct perf_tool
*tool __maybe_unused
,
25 union perf_event
*event
,
26 struct perf_sample
*sample
,
27 struct perf_evsel
*evsel __maybe_unused
,
28 struct machine
*machine
)
30 struct addr_location al
;
31 u8 cpumode
= event
->header
.misc
& PERF_RECORD_MISC_CPUMODE_MASK
;
32 struct thread
*thread
= machine__findnew_thread(machine
, sample
->pid
,
36 pr_err("problem processing %d event, skipping it.\n",
41 thread__find_addr_map(thread
, cpumode
, MAP__FUNCTION
, sample
->ip
, &al
);
50 static int perf_event__exit_del_thread(struct perf_tool
*tool __maybe_unused
,
51 union perf_event
*event
,
52 struct perf_sample
*sample
54 struct machine
*machine
)
56 struct thread
*thread
= machine__findnew_thread(machine
,
60 dump_printf("(%d:%d):(%d:%d)\n", event
->fork
.pid
, event
->fork
.tid
,
61 event
->fork
.ppid
, event
->fork
.ptid
);
64 machine__remove_thread(machine
, thread
);
71 struct perf_tool build_id__mark_dso_hit_ops
= {
72 .sample
= build_id__mark_dso_hit
,
73 .mmap
= perf_event__process_mmap
,
74 .mmap2
= perf_event__process_mmap2
,
75 .fork
= perf_event__process_fork
,
76 .exit
= perf_event__exit_del_thread
,
77 .attr
= perf_event__process_attr
,
78 .build_id
= perf_event__process_build_id
,
79 .ordered_events
= true,
82 int build_id__sprintf(const u8
*build_id
, int len
, char *bf
)
85 const u8
*raw
= build_id
;
88 for (i
= 0; i
< len
; ++i
) {
89 sprintf(bid
, "%02x", *raw
);
94 return (bid
- bf
) + 1;
97 int sysfs__sprintf_build_id(const char *root_dir
, char *sbuild_id
)
100 u8 build_id
[BUILD_ID_SIZE
];
106 scnprintf(notes
, sizeof(notes
), "%s/sys/kernel/notes", root_dir
);
108 ret
= sysfs__read_build_id(notes
, build_id
, sizeof(build_id
));
112 return build_id__sprintf(build_id
, sizeof(build_id
), sbuild_id
);
115 int filename__sprintf_build_id(const char *pathname
, char *sbuild_id
)
117 u8 build_id
[BUILD_ID_SIZE
];
120 ret
= filename__read_build_id(pathname
, build_id
, sizeof(build_id
));
123 else if (ret
!= sizeof(build_id
))
126 return build_id__sprintf(build_id
, sizeof(build_id
), sbuild_id
);
129 /* asnprintf consolidates asprintf and snprintf */
130 static int asnprintf(char **strp
, size_t size
, const char *fmt
, ...)
140 ret
= vsnprintf(*strp
, size
, fmt
, ap
);
142 ret
= vasprintf(strp
, fmt
, ap
);
148 static char *build_id__filename(const char *sbuild_id
, char *bf
, size_t size
)
151 int ret
= asnprintf(&bf
, size
, "%s/.build-id/%.2s/%s", buildid_dir
,
152 sbuild_id
, sbuild_id
+ 2);
153 if (ret
< 0 || (tmp
&& size
< (unsigned int)ret
))
158 char *dso__build_id_filename(const struct dso
*dso
, char *bf
, size_t size
)
160 char build_id_hex
[SBUILD_ID_SIZE
];
162 if (!dso
->has_build_id
)
165 build_id__sprintf(dso
->build_id
, sizeof(dso
->build_id
), build_id_hex
);
166 return build_id__filename(build_id_hex
, bf
, size
);
169 #define dsos__for_each_with_build_id(pos, head) \
170 list_for_each_entry(pos, head, node) \
171 if (!pos->has_build_id) \
175 static int write_buildid(const char *name
, size_t name_len
, u8
*build_id
,
176 pid_t pid
, u16 misc
, int fd
)
179 struct build_id_event b
;
183 len
= PERF_ALIGN(len
, NAME_ALIGN
);
185 memset(&b
, 0, sizeof(b
));
186 memcpy(&b
.build_id
, build_id
, BUILD_ID_SIZE
);
188 b
.header
.misc
= misc
;
189 b
.header
.size
= sizeof(b
) + len
;
191 err
= writen(fd
, &b
, sizeof(b
));
195 return write_padded(fd
, name
, name_len
+ 1, len
);
198 static int machine__write_buildid_table(struct machine
*machine
, int fd
)
203 u16 kmisc
= PERF_RECORD_MISC_KERNEL
,
204 umisc
= PERF_RECORD_MISC_USER
;
206 if (!machine__is_host(machine
)) {
207 kmisc
= PERF_RECORD_MISC_GUEST_KERNEL
;
208 umisc
= PERF_RECORD_MISC_GUEST_USER
;
211 dsos__for_each_with_build_id(pos
, &machine
->dsos
.head
) {
214 bool in_kernel
= false;
219 if (dso__is_vdso(pos
)) {
220 name
= pos
->short_name
;
221 name_len
= pos
->short_name_len
+ 1;
222 } else if (dso__is_kcore(pos
)) {
223 machine__mmap_name(machine
, nm
, sizeof(nm
));
225 name_len
= strlen(nm
) + 1;
227 name
= pos
->long_name
;
228 name_len
= pos
->long_name_len
+ 1;
231 in_kernel
= pos
->kernel
||
232 is_kernel_module(name
,
233 PERF_RECORD_MISC_CPUMODE_UNKNOWN
);
234 err
= write_buildid(name
, name_len
, pos
->build_id
, machine
->pid
,
235 in_kernel
? kmisc
: umisc
, fd
);
243 int perf_session__write_buildid_table(struct perf_session
*session
, int fd
)
246 int err
= machine__write_buildid_table(&session
->machines
.host
, fd
);
251 for (nd
= rb_first(&session
->machines
.guests
); nd
; nd
= rb_next(nd
)) {
252 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
253 err
= machine__write_buildid_table(pos
, fd
);
260 static int __dsos__hit_all(struct list_head
*head
)
264 list_for_each_entry(pos
, head
, node
)
270 static int machine__hit_all_dsos(struct machine
*machine
)
272 return __dsos__hit_all(&machine
->dsos
.head
);
275 int dsos__hit_all(struct perf_session
*session
)
280 err
= machine__hit_all_dsos(&session
->machines
.host
);
284 for (nd
= rb_first(&session
->machines
.guests
); nd
; nd
= rb_next(nd
)) {
285 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
287 err
= machine__hit_all_dsos(pos
);
295 void disable_buildid_cache(void)
297 no_buildid_cache
= true;
300 static char *build_id_cache__dirname_from_path(const char *name
,
301 bool is_kallsyms
, bool is_vdso
)
303 char *realname
= (char *)name
, *filename
;
304 bool slash
= is_kallsyms
|| is_vdso
;
307 realname
= realpath(name
, NULL
);
312 if (asprintf(&filename
, "%s%s%s", buildid_dir
, slash
? "/" : "",
313 is_vdso
? DSO__NAME_VDSO
: realname
) < 0)
322 int build_id_cache__list_build_ids(const char *pathname
,
323 struct strlist
**result
)
325 struct strlist
*list
;
331 list
= strlist__new(NULL
, NULL
);
332 dir_name
= build_id_cache__dirname_from_path(pathname
, false, false);
333 if (!list
|| !dir_name
) {
338 /* List up all dirents */
339 dir
= opendir(dir_name
);
345 while ((d
= readdir(dir
)) != NULL
) {
346 if (!strcmp(d
->d_name
, ".") || !strcmp(d
->d_name
, ".."))
348 strlist__add(list
, d
->d_name
);
355 strlist__delete(list
);
362 int build_id_cache__add_s(const char *sbuild_id
, const char *name
,
363 bool is_kallsyms
, bool is_vdso
)
365 const size_t size
= PATH_MAX
;
366 char *realname
= NULL
, *filename
= NULL
, *dir_name
= NULL
,
367 *linkname
= zalloc(size
), *targetname
, *tmp
;
371 realname
= realpath(name
, NULL
);
376 dir_name
= build_id_cache__dirname_from_path(name
, is_kallsyms
, is_vdso
);
380 if (mkdir_p(dir_name
, 0755))
383 if (asprintf(&filename
, "%s/%s", dir_name
, sbuild_id
) < 0) {
388 if (access(filename
, F_OK
)) {
390 if (copyfile("/proc/kallsyms", filename
))
392 } else if (link(realname
, filename
) && errno
!= EEXIST
&&
393 copyfile(name
, filename
))
397 if (!build_id__filename(sbuild_id
, linkname
, size
))
399 tmp
= strrchr(linkname
, '/');
402 if (access(linkname
, X_OK
) && mkdir_p(linkname
, 0755))
406 targetname
= filename
+ strlen(buildid_dir
) - 5;
407 memcpy(targetname
, "../..", 5);
409 if (symlink(targetname
, linkname
) == 0)
420 static int build_id_cache__add_b(const u8
*build_id
, size_t build_id_size
,
421 const char *name
, bool is_kallsyms
,
424 char sbuild_id
[SBUILD_ID_SIZE
];
426 build_id__sprintf(build_id
, build_id_size
, sbuild_id
);
428 return build_id_cache__add_s(sbuild_id
, name
, is_kallsyms
, is_vdso
);
431 bool build_id_cache__cached(const char *sbuild_id
)
434 char *filename
= build_id__filename(sbuild_id
, NULL
, 0);
436 if (filename
&& !access(filename
, F_OK
))
443 int build_id_cache__remove_s(const char *sbuild_id
)
445 const size_t size
= PATH_MAX
;
446 char *filename
= zalloc(size
),
447 *linkname
= zalloc(size
), *tmp
;
450 if (filename
== NULL
|| linkname
== NULL
)
453 if (!build_id__filename(sbuild_id
, linkname
, size
))
456 if (access(linkname
, F_OK
))
459 if (readlink(linkname
, filename
, size
- 1) < 0)
462 if (unlink(linkname
))
466 * Since the link is relative, we must make it absolute:
468 tmp
= strrchr(linkname
, '/') + 1;
469 snprintf(tmp
, size
- (tmp
- linkname
), "%s", filename
);
471 if (unlink(linkname
))
481 static int dso__cache_build_id(struct dso
*dso
, struct machine
*machine
)
483 bool is_kallsyms
= dso
->kernel
&& dso
->long_name
[0] != '/';
484 bool is_vdso
= dso__is_vdso(dso
);
485 const char *name
= dso
->long_name
;
488 if (dso__is_kcore(dso
)) {
490 machine__mmap_name(machine
, nm
, sizeof(nm
));
493 return build_id_cache__add_b(dso
->build_id
, sizeof(dso
->build_id
), name
,
494 is_kallsyms
, is_vdso
);
497 static int __dsos__cache_build_ids(struct list_head
*head
,
498 struct machine
*machine
)
503 dsos__for_each_with_build_id(pos
, head
)
504 if (dso__cache_build_id(pos
, machine
))
510 static int machine__cache_build_ids(struct machine
*machine
)
512 return __dsos__cache_build_ids(&machine
->dsos
.head
, machine
);
515 int perf_session__cache_build_ids(struct perf_session
*session
)
520 if (no_buildid_cache
)
523 if (mkdir(buildid_dir
, 0755) != 0 && errno
!= EEXIST
)
526 ret
= machine__cache_build_ids(&session
->machines
.host
);
528 for (nd
= rb_first(&session
->machines
.guests
); nd
; nd
= rb_next(nd
)) {
529 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
530 ret
|= machine__cache_build_ids(pos
);
535 static bool machine__read_build_ids(struct machine
*machine
, bool with_hits
)
537 return __dsos__read_build_ids(&machine
->dsos
.head
, with_hits
);
540 bool perf_session__read_build_ids(struct perf_session
*session
, bool with_hits
)
543 bool ret
= machine__read_build_ids(&session
->machines
.host
, with_hits
);
545 for (nd
= rb_first(&session
->machines
.guests
); nd
; nd
= rb_next(nd
)) {
546 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
547 ret
|= machine__read_build_ids(pos
, with_hits
);