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 /* asnprintf consolidates asprintf and snprintf */
97 static int asnprintf(char **strp, size_t size, const char *fmt, ...)
107 ret = vsnprintf(*strp, size, fmt, ap);
109 ret = vasprintf(strp, fmt, ap);
115 static char *build_id__filename(const char *sbuild_id, char *bf, size_t size)
118 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
119 sbuild_id, sbuild_id + 2);
120 if (ret < 0 || (tmp && size < (unsigned int)ret))
125 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
127 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
129 if (!dso->has_build_id)
132 build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex);
133 return build_id__filename(build_id_hex, bf, size);
136 #define dsos__for_each_with_build_id(pos, head) \
137 list_for_each_entry(pos, head, node) \
138 if (!pos->has_build_id) \
142 static int write_buildid(const char *name, size_t name_len, u8 *build_id,
143 pid_t pid, u16 misc, int fd)
146 struct build_id_event b;
150 len = PERF_ALIGN(len, NAME_ALIGN);
152 memset(&b, 0, sizeof(b));
153 memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
155 b.header.misc = misc;
156 b.header.size = sizeof(b) + len;
158 err = writen(fd, &b, sizeof(b));
162 return write_padded(fd, name, name_len + 1, len);
165 static int machine__write_buildid_table(struct machine *machine, int fd)
170 u16 kmisc = PERF_RECORD_MISC_KERNEL,
171 umisc = PERF_RECORD_MISC_USER;
173 if (!machine__is_host(machine)) {
174 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
175 umisc = PERF_RECORD_MISC_GUEST_USER;
178 dsos__for_each_with_build_id(pos, &machine->dsos.head) {
185 if (dso__is_vdso(pos)) {
186 name = pos->short_name;
187 name_len = pos->short_name_len + 1;
188 } else if (dso__is_kcore(pos)) {
189 machine__mmap_name(machine, nm, sizeof(nm));
191 name_len = strlen(nm) + 1;
193 name = pos->long_name;
194 name_len = pos->long_name_len + 1;
197 err = write_buildid(name, name_len, pos->build_id, machine->pid,
198 pos->kernel ? kmisc : umisc, fd);
206 int perf_session__write_buildid_table(struct perf_session *session, int fd)
209 int err = machine__write_buildid_table(&session->machines.host, fd);
214 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
215 struct machine *pos = rb_entry(nd, struct machine, rb_node);
216 err = machine__write_buildid_table(pos, fd);
223 static int __dsos__hit_all(struct list_head *head)
227 list_for_each_entry(pos, head, node)
233 static int machine__hit_all_dsos(struct machine *machine)
235 return __dsos__hit_all(&machine->dsos.head);
238 int dsos__hit_all(struct perf_session *session)
243 err = machine__hit_all_dsos(&session->machines.host);
247 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
248 struct machine *pos = rb_entry(nd, struct machine, rb_node);
250 err = machine__hit_all_dsos(pos);
258 void disable_buildid_cache(void)
260 no_buildid_cache = true;
263 static char *build_id_cache__dirname_from_path(const char *name,
264 bool is_kallsyms, bool is_vdso)
266 char *realname = (char *)name, *filename;
267 bool slash = is_kallsyms || is_vdso;
270 realname = realpath(name, NULL);
275 if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",
276 is_vdso ? DSO__NAME_VDSO : realname) < 0)
285 int build_id_cache__list_build_ids(const char *pathname,
286 struct strlist **result)
288 struct strlist *list;
294 list = strlist__new(true, NULL);
295 dir_name = build_id_cache__dirname_from_path(pathname, false, false);
296 if (!list || !dir_name) {
301 /* List up all dirents */
302 dir = opendir(dir_name);
308 while ((d = readdir(dir)) != NULL) {
309 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
311 strlist__add(list, d->d_name);
318 strlist__delete(list);
325 int build_id_cache__add_s(const char *sbuild_id, const char *name,
326 bool is_kallsyms, bool is_vdso)
328 const size_t size = PATH_MAX;
329 char *realname = NULL, *filename = NULL, *dir_name = NULL,
330 *linkname = zalloc(size), *targetname, *tmp;
334 realname = realpath(name, NULL);
339 dir_name = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);
343 if (mkdir_p(dir_name, 0755))
346 if (asprintf(&filename, "%s/%s", dir_name, sbuild_id) < 0) {
351 if (access(filename, F_OK)) {
353 if (copyfile("/proc/kallsyms", filename))
355 } else if (link(realname, filename) && errno != EEXIST &&
356 copyfile(name, filename))
360 if (!build_id__filename(sbuild_id, linkname, size))
362 tmp = strrchr(linkname, '/');
365 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
369 targetname = filename + strlen(buildid_dir) - 5;
370 memcpy(targetname, "../..", 5);
372 if (symlink(targetname, linkname) == 0)
383 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
384 const char *name, bool is_kallsyms,
387 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
389 build_id__sprintf(build_id, build_id_size, sbuild_id);
391 return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
394 bool build_id_cache__cached(const char *sbuild_id)
397 char *filename = build_id__filename(sbuild_id, NULL, 0);
399 if (filename && !access(filename, F_OK))
406 int build_id_cache__remove_s(const char *sbuild_id)
408 const size_t size = PATH_MAX;
409 char *filename = zalloc(size),
410 *linkname = zalloc(size), *tmp;
413 if (filename == NULL || linkname == NULL)
416 if (!build_id__filename(sbuild_id, linkname, size))
419 if (access(linkname, F_OK))
422 if (readlink(linkname, filename, size - 1) < 0)
425 if (unlink(linkname))
429 * Since the link is relative, we must make it absolute:
431 tmp = strrchr(linkname, '/') + 1;
432 snprintf(tmp, size - (tmp - linkname), "%s", filename);
434 if (unlink(linkname))
444 static int dso__cache_build_id(struct dso *dso, struct machine *machine)
446 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
447 bool is_vdso = dso__is_vdso(dso);
448 const char *name = dso->long_name;
451 if (dso__is_kcore(dso)) {
453 machine__mmap_name(machine, nm, sizeof(nm));
456 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
457 is_kallsyms, is_vdso);
460 static int __dsos__cache_build_ids(struct list_head *head,
461 struct machine *machine)
466 dsos__for_each_with_build_id(pos, head)
467 if (dso__cache_build_id(pos, machine))
473 static int machine__cache_build_ids(struct machine *machine)
475 return __dsos__cache_build_ids(&machine->dsos.head, machine);
478 int perf_session__cache_build_ids(struct perf_session *session)
483 if (no_buildid_cache)
486 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
489 ret = machine__cache_build_ids(&session->machines.host);
491 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
492 struct machine *pos = rb_entry(nd, struct machine, rb_node);
493 ret |= machine__cache_build_ids(pos);
498 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
500 return __dsos__read_build_ids(&machine->dsos.head, with_hits);
503 bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
506 bool ret = machine__read_build_ids(&session->machines.host, with_hits);
508 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
509 struct machine *pos = rb_entry(nd, struct machine, rb_node);
510 ret |= machine__read_build_ids(pos, with_hits);