1 #include <linux/types.h>
9 #include "thread_map.h"
10 #include "symbol/kallsyms.h"
12 static const char *perf_event__names[] = {
14 [PERF_RECORD_MMAP] = "MMAP",
15 [PERF_RECORD_MMAP2] = "MMAP2",
16 [PERF_RECORD_LOST] = "LOST",
17 [PERF_RECORD_COMM] = "COMM",
18 [PERF_RECORD_EXIT] = "EXIT",
19 [PERF_RECORD_THROTTLE] = "THROTTLE",
20 [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
21 [PERF_RECORD_FORK] = "FORK",
22 [PERF_RECORD_READ] = "READ",
23 [PERF_RECORD_SAMPLE] = "SAMPLE",
24 [PERF_RECORD_HEADER_ATTR] = "ATTR",
25 [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
26 [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
27 [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
28 [PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
31 const char *perf_event__name(unsigned int id)
33 if (id >= ARRAY_SIZE(perf_event__names))
35 if (!perf_event__names[id])
37 return perf_event__names[id];
40 static struct perf_sample synth_sample = {
49 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
51 char filename[PATH_MAX];
57 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
59 fp = fopen(filename, "r");
61 pr_debug("couldn't open %s\n", filename);
65 while (!comm[0] || (tgid < 0)) {
66 if (fgets(bf, sizeof(bf), fp) == NULL) {
67 pr_warning("couldn't get COMM and pgid, malformed %s\n",
72 if (memcmp(bf, "Name:", 5) == 0) {
74 while (*name && isspace(*name))
76 size = strlen(name) - 1;
79 memcpy(comm, name, size);
82 } else if (memcmp(bf, "Tgid:", 5) == 0) {
84 while (*tgids && isspace(*tgids))
95 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
96 union perf_event *event, pid_t pid,
98 perf_event__handler_t process,
99 struct machine *machine)
101 char filename[PATH_MAX];
104 struct dirent dirent, *next;
107 memset(&event->comm, 0, sizeof(event->comm));
109 tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
110 sizeof(event->comm.comm));
114 event->comm.pid = tgid;
115 event->comm.header.type = PERF_RECORD_COMM;
117 size = strlen(event->comm.comm) + 1;
118 size = PERF_ALIGN(size, sizeof(u64));
119 memset(event->comm.comm + size, 0, machine->id_hdr_size);
120 event->comm.header.size = (sizeof(event->comm) -
121 (sizeof(event->comm.comm) - size) +
122 machine->id_hdr_size);
124 event->comm.tid = pid;
126 if (process(tool, event, &synth_sample, machine) != 0)
132 snprintf(filename, sizeof(filename), "%s/proc/%d/task",
133 machine->root_dir, pid);
135 tasks = opendir(filename);
137 pr_debug("couldn't open %s\n", filename);
141 while (!readdir_r(tasks, &dirent, &next) && next) {
143 pid = strtol(dirent.d_name, &end, 10);
147 /* already have tgid; jut want to update the comm */
148 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
149 sizeof(event->comm.comm));
151 size = strlen(event->comm.comm) + 1;
152 size = PERF_ALIGN(size, sizeof(u64));
153 memset(event->comm.comm + size, 0, machine->id_hdr_size);
154 event->comm.header.size = (sizeof(event->comm) -
155 (sizeof(event->comm.comm) - size) +
156 machine->id_hdr_size);
158 event->comm.tid = pid;
160 if (process(tool, event, &synth_sample, machine) != 0) {
171 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
172 union perf_event *event,
173 pid_t pid, pid_t tgid,
174 perf_event__handler_t process,
175 struct machine *machine,
178 char filename[PATH_MAX];
182 snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
183 machine->root_dir, pid);
185 fp = fopen(filename, "r");
188 * We raced with a task exiting - just return:
190 pr_debug("couldn't open %s\n", filename);
194 event->header.type = PERF_RECORD_MMAP;
199 char execname[PATH_MAX];
200 char anonstr[] = "//anon";
204 if (fgets(bf, sizeof(bf), fp) == NULL)
207 /* ensure null termination since stack will be reused. */
208 strcpy(execname, "");
210 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
211 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
212 &event->mmap.start, &event->mmap.len, prot,
216 * Anon maps don't have the execname.
221 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
223 if (machine__is_host(machine))
224 event->header.misc = PERF_RECORD_MISC_USER;
226 event->header.misc = PERF_RECORD_MISC_GUEST_USER;
228 if (prot[2] != 'x') {
229 if (!mmap_data || prot[0] != 'r')
232 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
235 if (!strcmp(execname, ""))
236 strcpy(execname, anonstr);
238 size = strlen(execname) + 1;
239 memcpy(event->mmap.filename, execname, size);
240 size = PERF_ALIGN(size, sizeof(u64));
241 event->mmap.len -= event->mmap.start;
242 event->mmap.header.size = (sizeof(event->mmap) -
243 (sizeof(event->mmap.filename) - size));
244 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
245 event->mmap.header.size += machine->id_hdr_size;
246 event->mmap.pid = tgid;
247 event->mmap.tid = pid;
249 if (process(tool, event, &synth_sample, machine) != 0) {
259 int perf_event__synthesize_modules(struct perf_tool *tool,
260 perf_event__handler_t process,
261 struct machine *machine)
265 struct map_groups *kmaps = &machine->kmaps;
266 union perf_event *event = zalloc((sizeof(event->mmap) +
267 machine->id_hdr_size));
269 pr_debug("Not enough memory synthesizing mmap event "
270 "for kernel modules\n");
274 event->header.type = PERF_RECORD_MMAP;
277 * kernel uses 0 for user space maps, see kernel/perf_event.c
280 if (machine__is_host(machine))
281 event->header.misc = PERF_RECORD_MISC_KERNEL;
283 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
285 for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
286 nd; nd = rb_next(nd)) {
288 struct map *pos = rb_entry(nd, struct map, rb_node);
290 if (pos->dso->kernel)
293 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
294 event->mmap.header.type = PERF_RECORD_MMAP;
295 event->mmap.header.size = (sizeof(event->mmap) -
296 (sizeof(event->mmap.filename) - size));
297 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
298 event->mmap.header.size += machine->id_hdr_size;
299 event->mmap.start = pos->start;
300 event->mmap.len = pos->end - pos->start;
301 event->mmap.pid = machine->pid;
303 memcpy(event->mmap.filename, pos->dso->long_name,
304 pos->dso->long_name_len + 1);
305 if (process(tool, event, &synth_sample, machine) != 0) {
315 static int __event__synthesize_thread(union perf_event *comm_event,
316 union perf_event *mmap_event,
318 perf_event__handler_t process,
319 struct perf_tool *tool,
320 struct machine *machine, bool mmap_data)
322 pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
326 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
327 process, machine, mmap_data);
330 int perf_event__synthesize_thread_map(struct perf_tool *tool,
331 struct thread_map *threads,
332 perf_event__handler_t process,
333 struct machine *machine,
336 union perf_event *comm_event, *mmap_event;
337 int err = -1, thread, j;
339 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
340 if (comm_event == NULL)
343 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
344 if (mmap_event == NULL)
348 for (thread = 0; thread < threads->nr; ++thread) {
349 if (__event__synthesize_thread(comm_event, mmap_event,
350 threads->map[thread], 0,
351 process, tool, machine,
358 * comm.pid is set to thread group id by
359 * perf_event__synthesize_comm
361 if ((int) comm_event->comm.pid != threads->map[thread]) {
362 bool need_leader = true;
364 /* is thread group leader in thread_map? */
365 for (j = 0; j < threads->nr; ++j) {
366 if ((int) comm_event->comm.pid == threads->map[j]) {
372 /* if not, generate events for it */
374 __event__synthesize_thread(comm_event, mmap_event,
375 comm_event->comm.pid, 0,
376 process, tool, machine,
390 int perf_event__synthesize_threads(struct perf_tool *tool,
391 perf_event__handler_t process,
392 struct machine *machine, bool mmap_data)
395 char proc_path[PATH_MAX];
396 struct dirent dirent, *next;
397 union perf_event *comm_event, *mmap_event;
400 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
401 if (comm_event == NULL)
404 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
405 if (mmap_event == NULL)
408 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
409 proc = opendir(proc_path);
414 while (!readdir_r(proc, &dirent, &next) && next) {
416 pid_t pid = strtol(dirent.d_name, &end, 10);
418 if (*end) /* only interested in proper numerical dirents */
421 * We may race with exiting thread, so don't stop just because
422 * one thread couldn't be synthesized.
424 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
425 process, tool, machine, mmap_data);
438 struct process_symbol_args {
443 static int find_symbol_cb(void *arg, const char *name, char type,
446 struct process_symbol_args *args = arg;
449 * Must be a function or at least an alias, as in PARISC64, where "_text" is
450 * an 'A' to the same address as "_stext".
452 if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
453 type == 'A') || strcmp(name, args->name))
460 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
461 perf_event__handler_t process,
462 struct machine *machine,
463 const char *symbol_name)
466 const char *filename, *mmap_name;
468 char name_buff[PATH_MAX];
472 * We should get this from /sys/kernel/sections/.text, but till that is
473 * available use this, and after it is use this as a fallback for older
476 struct process_symbol_args args = { .name = symbol_name, };
477 union perf_event *event = zalloc((sizeof(event->mmap) +
478 machine->id_hdr_size));
480 pr_debug("Not enough memory synthesizing mmap event "
481 "for kernel modules\n");
485 mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
486 if (machine__is_host(machine)) {
488 * kernel uses PERF_RECORD_MISC_USER for user space maps,
489 * see kernel/perf_event.c __perf_event_mmap
491 event->header.misc = PERF_RECORD_MISC_KERNEL;
492 filename = "/proc/kallsyms";
494 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
495 if (machine__is_default_guest(machine))
496 filename = (char *) symbol_conf.default_guest_kallsyms;
498 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
503 if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0) {
508 map = machine->vmlinux_maps[MAP__FUNCTION];
509 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
510 "%s%s", mmap_name, symbol_name) + 1;
511 size = PERF_ALIGN(size, sizeof(u64));
512 event->mmap.header.type = PERF_RECORD_MMAP;
513 event->mmap.header.size = (sizeof(event->mmap) -
514 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
515 event->mmap.pgoff = args.start;
516 event->mmap.start = map->start;
517 event->mmap.len = map->end - event->mmap.start;
518 event->mmap.pid = machine->pid;
520 err = process(tool, event, &synth_sample, machine);
526 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
528 return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
531 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
532 union perf_event *event,
533 struct perf_sample *sample,
534 struct machine *machine)
536 return machine__process_comm_event(machine, event, sample);
539 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
540 union perf_event *event,
541 struct perf_sample *sample,
542 struct machine *machine)
544 return machine__process_lost_event(machine, event, sample);
547 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
549 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
550 event->mmap.pid, event->mmap.tid, event->mmap.start,
551 event->mmap.len, event->mmap.pgoff,
552 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
553 event->mmap.filename);
556 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
558 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
559 " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
560 event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
561 event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
562 event->mmap2.min, event->mmap2.ino,
563 event->mmap2.ino_generation,
564 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
565 event->mmap2.filename);
568 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
569 union perf_event *event,
570 struct perf_sample *sample,
571 struct machine *machine)
573 return machine__process_mmap_event(machine, event, sample);
576 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
577 union perf_event *event,
578 struct perf_sample *sample,
579 struct machine *machine)
581 return machine__process_mmap2_event(machine, event, sample);
584 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
586 return fprintf(fp, "(%d:%d):(%d:%d)\n",
587 event->fork.pid, event->fork.tid,
588 event->fork.ppid, event->fork.ptid);
591 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
592 union perf_event *event,
593 struct perf_sample *sample,
594 struct machine *machine)
596 return machine__process_fork_event(machine, event, sample);
599 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
600 union perf_event *event,
601 struct perf_sample *sample,
602 struct machine *machine)
604 return machine__process_exit_event(machine, event, sample);
607 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
609 size_t ret = fprintf(fp, "PERF_RECORD_%s",
610 perf_event__name(event->header.type));
612 switch (event->header.type) {
613 case PERF_RECORD_COMM:
614 ret += perf_event__fprintf_comm(event, fp);
616 case PERF_RECORD_FORK:
617 case PERF_RECORD_EXIT:
618 ret += perf_event__fprintf_task(event, fp);
620 case PERF_RECORD_MMAP:
621 ret += perf_event__fprintf_mmap(event, fp);
623 case PERF_RECORD_MMAP2:
624 ret += perf_event__fprintf_mmap2(event, fp);
627 ret += fprintf(fp, "\n");
633 int perf_event__process(struct perf_tool *tool __maybe_unused,
634 union perf_event *event,
635 struct perf_sample *sample,
636 struct machine *machine)
638 return machine__process_event(machine, event, sample);
641 void thread__find_addr_map(struct thread *thread,
642 struct machine *machine, u8 cpumode,
643 enum map_type type, u64 addr,
644 struct addr_location *al)
646 struct map_groups *mg = &thread->mg;
647 bool load_map = false;
649 al->machine = machine;
652 al->cpumode = cpumode;
653 al->filtered = false;
655 if (machine == NULL) {
660 if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
662 mg = &machine->kmaps;
664 } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
666 } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
668 mg = &machine->kmaps;
670 } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
676 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
677 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
680 if ((cpumode == PERF_RECORD_MISC_USER ||
681 cpumode == PERF_RECORD_MISC_KERNEL) &&
688 al->map = map_groups__find(mg, type, al->addr);
689 if (al->map == NULL) {
691 * If this is outside of all known maps, and is a negative
692 * address, try to look it up in the kernel dso, as it might be
693 * a vsyscall or vdso (which executes in user-mode).
695 * XXX This is nasty, we should have a symbol list in the
696 * "[vdso]" dso, but for now lets use the old trick of looking
697 * in the whole kernel symbol list.
699 if ((long long)al->addr < 0 &&
700 cpumode == PERF_RECORD_MISC_USER &&
701 machine && mg != &machine->kmaps) {
702 mg = &machine->kmaps;
707 * Kernel maps might be changed when loading symbols so loading
708 * must be done prior to using kernel maps.
711 map__load(al->map, machine->symbol_filter);
712 al->addr = al->map->map_ip(al->map, al->addr);
716 void thread__find_addr_location(struct thread *thread, struct machine *machine,
717 u8 cpumode, enum map_type type, u64 addr,
718 struct addr_location *al)
720 thread__find_addr_map(thread, machine, cpumode, type, addr, al);
722 al->sym = map__find_symbol(al->map, al->addr,
723 machine->symbol_filter);
728 int perf_event__preprocess_sample(const union perf_event *event,
729 struct machine *machine,
730 struct addr_location *al,
731 struct perf_sample *sample)
733 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
734 struct thread *thread = machine__findnew_thread(machine, sample->pid,
740 if (thread__is_filtered(thread))
743 dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
745 * Have we already created the kernel maps for this machine?
747 * This should have happened earlier, when we processed the kernel MMAP
748 * events, but for older perf.data files there was no such thing, so do
751 if (cpumode == PERF_RECORD_MISC_KERNEL &&
752 machine->vmlinux_maps[MAP__FUNCTION] == NULL)
753 machine__create_kernel_maps(machine);
755 thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
757 dump_printf(" ...... dso: %s\n",
758 al->map ? al->map->dso->long_name :
759 al->level == 'H' ? "[hypervisor]" : "<not found>");
761 al->cpu = sample->cpu;
764 struct dso *dso = al->map->dso;
766 if (symbol_conf.dso_list &&
767 (!dso || !(strlist__has_entry(symbol_conf.dso_list,
769 (dso->short_name != dso->long_name &&
770 strlist__has_entry(symbol_conf.dso_list,
774 al->sym = map__find_symbol(al->map, al->addr,
775 machine->symbol_filter);
778 if (symbol_conf.sym_list &&
779 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,