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,
81 int build_id__sprintf(const u8 *build_id, int len, char *bf)
84 const u8 *raw = build_id;
87 for (i = 0; i < len; ++i) {
88 sprintf(bid, "%02x", *raw);
93 return raw - build_id;
96 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
99 u8 build_id[BUILD_ID_SIZE];
105 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
107 ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
111 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
114 int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
116 u8 build_id[BUILD_ID_SIZE];
119 ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
122 else if (ret != sizeof(build_id))
125 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
128 /* asnprintf consolidates asprintf and snprintf */
129 static int asnprintf(char **strp, size_t size, const char *fmt, ...)
139 ret = vsnprintf(*strp, size, fmt, ap);
141 ret = vasprintf(strp, fmt, ap);
147 static char *build_id__filename(const char *sbuild_id, char *bf, size_t size)
150 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
151 sbuild_id, sbuild_id + 2);
152 if (ret < 0 || (tmp && size < (unsigned int)ret))
157 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
159 char build_id_hex[SBUILD_ID_SIZE];
161 if (!dso->has_build_id)
164 build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex);
165 return build_id__filename(build_id_hex, bf, size);
168 #define dsos__for_each_with_build_id(pos, head) \
169 list_for_each_entry(pos, head, node) \
170 if (!pos->has_build_id) \
174 static int write_buildid(const char *name, size_t name_len, u8 *build_id,
175 pid_t pid, u16 misc, int fd)
178 struct build_id_event b;
182 len = PERF_ALIGN(len, NAME_ALIGN);
184 memset(&b, 0, sizeof(b));
185 memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
187 b.header.misc = misc;
188 b.header.size = sizeof(b) + len;
190 err = writen(fd, &b, sizeof(b));
194 return write_padded(fd, name, name_len + 1, len);
197 static int machine__write_buildid_table(struct machine *machine, int fd)
202 u16 kmisc = PERF_RECORD_MISC_KERNEL,
203 umisc = PERF_RECORD_MISC_USER;
205 if (!machine__is_host(machine)) {
206 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
207 umisc = PERF_RECORD_MISC_GUEST_USER;
210 dsos__for_each_with_build_id(pos, &machine->dsos.head) {
217 if (dso__is_vdso(pos)) {
218 name = pos->short_name;
219 name_len = pos->short_name_len + 1;
220 } else if (dso__is_kcore(pos)) {
221 machine__mmap_name(machine, nm, sizeof(nm));
223 name_len = strlen(nm) + 1;
225 name = pos->long_name;
226 name_len = pos->long_name_len + 1;
229 err = write_buildid(name, name_len, pos->build_id, machine->pid,
230 pos->kernel ? kmisc : umisc, fd);
238 int perf_session__write_buildid_table(struct perf_session *session, int fd)
241 int err = machine__write_buildid_table(&session->machines.host, fd);
246 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
247 struct machine *pos = rb_entry(nd, struct machine, rb_node);
248 err = machine__write_buildid_table(pos, fd);
255 static int __dsos__hit_all(struct list_head *head)
259 list_for_each_entry(pos, head, node)
265 static int machine__hit_all_dsos(struct machine *machine)
267 return __dsos__hit_all(&machine->dsos.head);
270 int dsos__hit_all(struct perf_session *session)
275 err = machine__hit_all_dsos(&session->machines.host);
279 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
280 struct machine *pos = rb_entry(nd, struct machine, rb_node);
282 err = machine__hit_all_dsos(pos);
290 void disable_buildid_cache(void)
292 no_buildid_cache = true;
295 static char *build_id_cache__dirname_from_path(const char *name,
296 bool is_kallsyms, bool is_vdso)
298 char *realname = (char *)name, *filename;
299 bool slash = is_kallsyms || is_vdso;
302 realname = realpath(name, NULL);
307 if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",
308 is_vdso ? DSO__NAME_VDSO : realname) < 0)
317 int build_id_cache__list_build_ids(const char *pathname,
318 struct strlist **result)
320 struct strlist *list;
326 list = strlist__new(NULL, NULL);
327 dir_name = build_id_cache__dirname_from_path(pathname, false, false);
328 if (!list || !dir_name) {
333 /* List up all dirents */
334 dir = opendir(dir_name);
340 while ((d = readdir(dir)) != NULL) {
341 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
343 strlist__add(list, d->d_name);
350 strlist__delete(list);
357 int build_id_cache__add_s(const char *sbuild_id, const char *name,
358 bool is_kallsyms, bool is_vdso)
360 const size_t size = PATH_MAX;
361 char *realname = NULL, *filename = NULL, *dir_name = NULL,
362 *linkname = zalloc(size), *targetname, *tmp;
366 realname = realpath(name, NULL);
371 dir_name = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);
375 if (mkdir_p(dir_name, 0755))
378 if (asprintf(&filename, "%s/%s", dir_name, sbuild_id) < 0) {
383 if (access(filename, F_OK)) {
385 if (copyfile("/proc/kallsyms", filename))
387 } else if (link(realname, filename) && errno != EEXIST &&
388 copyfile(name, filename))
392 if (!build_id__filename(sbuild_id, linkname, size))
394 tmp = strrchr(linkname, '/');
397 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
401 targetname = filename + strlen(buildid_dir) - 5;
402 memcpy(targetname, "../..", 5);
404 if (symlink(targetname, linkname) == 0)
415 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
416 const char *name, bool is_kallsyms,
419 char sbuild_id[SBUILD_ID_SIZE];
421 build_id__sprintf(build_id, build_id_size, sbuild_id);
423 return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
426 bool build_id_cache__cached(const char *sbuild_id)
429 char *filename = build_id__filename(sbuild_id, NULL, 0);
431 if (filename && !access(filename, F_OK))
438 int build_id_cache__remove_s(const char *sbuild_id)
440 const size_t size = PATH_MAX;
441 char *filename = zalloc(size),
442 *linkname = zalloc(size), *tmp;
445 if (filename == NULL || linkname == NULL)
448 if (!build_id__filename(sbuild_id, linkname, size))
451 if (access(linkname, F_OK))
454 if (readlink(linkname, filename, size - 1) < 0)
457 if (unlink(linkname))
461 * Since the link is relative, we must make it absolute:
463 tmp = strrchr(linkname, '/') + 1;
464 snprintf(tmp, size - (tmp - linkname), "%s", filename);
466 if (unlink(linkname))
476 static int dso__cache_build_id(struct dso *dso, struct machine *machine)
478 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
479 bool is_vdso = dso__is_vdso(dso);
480 const char *name = dso->long_name;
483 if (dso__is_kcore(dso)) {
485 machine__mmap_name(machine, nm, sizeof(nm));
488 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
489 is_kallsyms, is_vdso);
492 static int __dsos__cache_build_ids(struct list_head *head,
493 struct machine *machine)
498 dsos__for_each_with_build_id(pos, head)
499 if (dso__cache_build_id(pos, machine))
505 static int machine__cache_build_ids(struct machine *machine)
507 return __dsos__cache_build_ids(&machine->dsos.head, machine);
510 int perf_session__cache_build_ids(struct perf_session *session)
515 if (no_buildid_cache)
518 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
521 ret = machine__cache_build_ids(&session->machines.host);
523 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
524 struct machine *pos = rb_entry(nd, struct machine, rb_node);
525 ret |= machine__cache_build_ids(pos);
530 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
532 return __dsos__read_build_ids(&machine->dsos.head, with_hits);
535 bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
538 bool ret = machine__read_build_ids(&session->machines.host, with_hits);
540 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
541 struct machine *pos = rb_entry(nd, struct machine, rb_node);
542 ret |= machine__read_build_ids(pos, with_hits);