1 #include <linux/types.h>
9 #include "thread_map.h"
11 static const char *perf_event__names[] = {
13 [PERF_RECORD_MMAP] = "MMAP",
14 [PERF_RECORD_MMAP2] = "MMAP2",
15 [PERF_RECORD_LOST] = "LOST",
16 [PERF_RECORD_COMM] = "COMM",
17 [PERF_RECORD_EXIT] = "EXIT",
18 [PERF_RECORD_THROTTLE] = "THROTTLE",
19 [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
20 [PERF_RECORD_FORK] = "FORK",
21 [PERF_RECORD_READ] = "READ",
22 [PERF_RECORD_SAMPLE] = "SAMPLE",
23 [PERF_RECORD_HEADER_ATTR] = "ATTR",
24 [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
25 [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
26 [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
27 [PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
30 const char *perf_event__name(unsigned int id)
32 if (id >= ARRAY_SIZE(perf_event__names))
34 if (!perf_event__names[id])
36 return perf_event__names[id];
39 static struct perf_sample synth_sample = {
48 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
50 char filename[PATH_MAX];
56 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
58 fp = fopen(filename, "r");
60 pr_debug("couldn't open %s\n", filename);
64 while (!comm[0] || (tgid < 0)) {
65 if (fgets(bf, sizeof(bf), fp) == NULL) {
66 pr_warning("couldn't get COMM and pgid, malformed %s\n",
71 if (memcmp(bf, "Name:", 5) == 0) {
73 while (*name && isspace(*name))
75 size = strlen(name) - 1;
78 memcpy(comm, name, size);
81 } else if (memcmp(bf, "Tgid:", 5) == 0) {
83 while (*tgids && isspace(*tgids))
94 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
95 union perf_event *event, pid_t pid,
97 perf_event__handler_t process,
98 struct machine *machine)
100 char filename[PATH_MAX];
103 struct dirent dirent, *next;
106 memset(&event->comm, 0, sizeof(event->comm));
108 tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
109 sizeof(event->comm.comm));
113 event->comm.pid = tgid;
114 event->comm.header.type = PERF_RECORD_COMM;
116 size = strlen(event->comm.comm) + 1;
117 size = PERF_ALIGN(size, sizeof(u64));
118 memset(event->comm.comm + size, 0, machine->id_hdr_size);
119 event->comm.header.size = (sizeof(event->comm) -
120 (sizeof(event->comm.comm) - size) +
121 machine->id_hdr_size);
123 event->comm.tid = pid;
125 if (process(tool, event, &synth_sample, machine) != 0)
131 snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
133 tasks = opendir(filename);
135 pr_debug("couldn't open %s\n", filename);
139 while (!readdir_r(tasks, &dirent, &next) && next) {
141 pid = strtol(dirent.d_name, &end, 10);
145 /* already have tgid; jut want to update the comm */
146 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
147 sizeof(event->comm.comm));
149 size = strlen(event->comm.comm) + 1;
150 size = PERF_ALIGN(size, sizeof(u64));
151 memset(event->comm.comm + size, 0, machine->id_hdr_size);
152 event->comm.header.size = (sizeof(event->comm) -
153 (sizeof(event->comm.comm) - size) +
154 machine->id_hdr_size);
156 event->comm.tid = pid;
158 if (process(tool, event, &synth_sample, machine) != 0) {
169 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
170 union perf_event *event,
171 pid_t pid, pid_t tgid,
172 perf_event__handler_t process,
173 struct machine *machine)
175 char filename[PATH_MAX];
179 snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
181 fp = fopen(filename, "r");
184 * We raced with a task exiting - just return:
186 pr_debug("couldn't open %s\n", filename);
190 event->header.type = PERF_RECORD_MMAP2;
192 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
194 event->header.misc = PERF_RECORD_MISC_USER;
199 char execname[PATH_MAX];
200 char anonstr[] = "//anon";
205 if (fgets(bf, sizeof(bf), fp) == NULL)
208 /* ensure null termination since stack will be reused. */
209 strcpy(execname, "");
211 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
212 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %s\n",
213 &event->mmap2.start, &event->mmap2.len, prot,
214 &event->mmap2.pgoff, &event->mmap2.maj,
218 event->mmap2.ino = (u64)ino;
226 if (!strcmp(execname, ""))
227 strcpy(execname, anonstr);
229 size = strlen(execname) + 1;
230 memcpy(event->mmap2.filename, execname, size);
231 size = PERF_ALIGN(size, sizeof(u64));
232 event->mmap2.len -= event->mmap.start;
233 event->mmap2.header.size = (sizeof(event->mmap2) -
234 (sizeof(event->mmap2.filename) - size));
235 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
236 event->mmap2.header.size += machine->id_hdr_size;
237 event->mmap2.pid = tgid;
238 event->mmap2.tid = pid;
240 if (process(tool, event, &synth_sample, machine) != 0) {
250 int perf_event__synthesize_modules(struct perf_tool *tool,
251 perf_event__handler_t process,
252 struct machine *machine)
256 struct map_groups *kmaps = &machine->kmaps;
257 union perf_event *event = zalloc((sizeof(event->mmap) +
258 machine->id_hdr_size));
260 pr_debug("Not enough memory synthesizing mmap event "
261 "for kernel modules\n");
265 event->header.type = PERF_RECORD_MMAP;
268 * kernel uses 0 for user space maps, see kernel/perf_event.c
271 if (machine__is_host(machine))
272 event->header.misc = PERF_RECORD_MISC_KERNEL;
274 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
276 for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
277 nd; nd = rb_next(nd)) {
279 struct map *pos = rb_entry(nd, struct map, rb_node);
281 if (pos->dso->kernel)
284 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
285 event->mmap.header.type = PERF_RECORD_MMAP;
286 event->mmap.header.size = (sizeof(event->mmap) -
287 (sizeof(event->mmap.filename) - size));
288 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
289 event->mmap.header.size += machine->id_hdr_size;
290 event->mmap.start = pos->start;
291 event->mmap.len = pos->end - pos->start;
292 event->mmap.pid = machine->pid;
294 memcpy(event->mmap.filename, pos->dso->long_name,
295 pos->dso->long_name_len + 1);
296 if (process(tool, event, &synth_sample, machine) != 0) {
306 static int __event__synthesize_thread(union perf_event *comm_event,
307 union perf_event *mmap_event,
309 perf_event__handler_t process,
310 struct perf_tool *tool,
311 struct machine *machine)
313 pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
317 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
321 int perf_event__synthesize_thread_map(struct perf_tool *tool,
322 struct thread_map *threads,
323 perf_event__handler_t process,
324 struct machine *machine)
326 union perf_event *comm_event, *mmap_event;
327 int err = -1, thread, j;
329 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
330 if (comm_event == NULL)
333 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
334 if (mmap_event == NULL)
338 for (thread = 0; thread < threads->nr; ++thread) {
339 if (__event__synthesize_thread(comm_event, mmap_event,
340 threads->map[thread], 0,
341 process, tool, machine)) {
347 * comm.pid is set to thread group id by
348 * perf_event__synthesize_comm
350 if ((int) comm_event->comm.pid != threads->map[thread]) {
351 bool need_leader = true;
353 /* is thread group leader in thread_map? */
354 for (j = 0; j < threads->nr; ++j) {
355 if ((int) comm_event->comm.pid == threads->map[j]) {
361 /* if not, generate events for it */
363 __event__synthesize_thread(comm_event,
365 comm_event->comm.pid, 0,
366 process, tool, machine)) {
379 int perf_event__synthesize_threads(struct perf_tool *tool,
380 perf_event__handler_t process,
381 struct machine *machine)
384 struct dirent dirent, *next;
385 union perf_event *comm_event, *mmap_event;
388 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
389 if (comm_event == NULL)
392 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
393 if (mmap_event == NULL)
396 proc = opendir("/proc");
400 while (!readdir_r(proc, &dirent, &next) && next) {
402 pid_t pid = strtol(dirent.d_name, &end, 10);
404 if (*end) /* only interested in proper numerical dirents */
407 * We may race with exiting thread, so don't stop just because
408 * one thread couldn't be synthesized.
410 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
411 process, tool, machine);
424 struct process_symbol_args {
429 static int find_symbol_cb(void *arg, const char *name, char type,
432 struct process_symbol_args *args = arg;
435 * Must be a function or at least an alias, as in PARISC64, where "_text" is
436 * an 'A' to the same address as "_stext".
438 if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
439 type == 'A') || strcmp(name, args->name))
446 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
447 perf_event__handler_t process,
448 struct machine *machine,
449 const char *symbol_name)
452 const char *filename, *mmap_name;
454 char name_buff[PATH_MAX];
458 * We should get this from /sys/kernel/sections/.text, but till that is
459 * available use this, and after it is use this as a fallback for older
462 struct process_symbol_args args = { .name = symbol_name, };
463 union perf_event *event = zalloc((sizeof(event->mmap) +
464 machine->id_hdr_size));
466 pr_debug("Not enough memory synthesizing mmap event "
467 "for kernel modules\n");
471 mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
472 if (machine__is_host(machine)) {
474 * kernel uses PERF_RECORD_MISC_USER for user space maps,
475 * see kernel/perf_event.c __perf_event_mmap
477 event->header.misc = PERF_RECORD_MISC_KERNEL;
478 filename = "/proc/kallsyms";
480 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
481 if (machine__is_default_guest(machine))
482 filename = (char *) symbol_conf.default_guest_kallsyms;
484 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
489 if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0) {
494 map = machine->vmlinux_maps[MAP__FUNCTION];
495 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
496 "%s%s", mmap_name, symbol_name) + 1;
497 size = PERF_ALIGN(size, sizeof(u64));
498 event->mmap.header.type = PERF_RECORD_MMAP;
499 event->mmap.header.size = (sizeof(event->mmap) -
500 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
501 event->mmap.pgoff = args.start;
502 event->mmap.start = map->start;
503 event->mmap.len = map->end - event->mmap.start;
504 event->mmap.pid = machine->pid;
506 err = process(tool, event, &synth_sample, machine);
512 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
514 return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
517 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
518 union perf_event *event,
519 struct perf_sample *sample __maybe_unused,
520 struct machine *machine)
522 return machine__process_comm_event(machine, event);
525 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
526 union perf_event *event,
527 struct perf_sample *sample __maybe_unused,
528 struct machine *machine)
530 return machine__process_lost_event(machine, event);
533 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
535 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %s\n",
536 event->mmap.pid, event->mmap.tid, event->mmap.start,
537 event->mmap.len, event->mmap.pgoff, event->mmap.filename);
540 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
542 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
543 " %02x:%02x %"PRIu64" %"PRIu64"]: %s\n",
544 event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
545 event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
546 event->mmap2.min, event->mmap2.ino,
547 event->mmap2.ino_generation,
548 event->mmap2.filename);
551 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
552 union perf_event *event,
553 struct perf_sample *sample __maybe_unused,
554 struct machine *machine)
556 return machine__process_mmap_event(machine, event);
559 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
560 union perf_event *event,
561 struct perf_sample *sample __maybe_unused,
562 struct machine *machine)
564 return machine__process_mmap2_event(machine, event);
567 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
569 return fprintf(fp, "(%d:%d):(%d:%d)\n",
570 event->fork.pid, event->fork.tid,
571 event->fork.ppid, event->fork.ptid);
574 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
575 union perf_event *event,
576 struct perf_sample *sample __maybe_unused,
577 struct machine *machine)
579 return machine__process_fork_event(machine, event);
582 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
583 union perf_event *event,
584 struct perf_sample *sample __maybe_unused,
585 struct machine *machine)
587 return machine__process_exit_event(machine, event);
590 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
592 size_t ret = fprintf(fp, "PERF_RECORD_%s",
593 perf_event__name(event->header.type));
595 switch (event->header.type) {
596 case PERF_RECORD_COMM:
597 ret += perf_event__fprintf_comm(event, fp);
599 case PERF_RECORD_FORK:
600 case PERF_RECORD_EXIT:
601 ret += perf_event__fprintf_task(event, fp);
603 case PERF_RECORD_MMAP:
604 ret += perf_event__fprintf_mmap(event, fp);
606 case PERF_RECORD_MMAP2:
607 ret += perf_event__fprintf_mmap2(event, fp);
610 ret += fprintf(fp, "\n");
616 int perf_event__process(struct perf_tool *tool __maybe_unused,
617 union perf_event *event,
618 struct perf_sample *sample __maybe_unused,
619 struct machine *machine)
621 return machine__process_event(machine, event);
624 void thread__find_addr_map(struct thread *self,
625 struct machine *machine, u8 cpumode,
626 enum map_type type, u64 addr,
627 struct addr_location *al)
629 struct map_groups *mg = &self->mg;
630 bool load_map = false;
634 al->cpumode = cpumode;
635 al->filtered = false;
637 if (machine == NULL) {
642 if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
644 mg = &machine->kmaps;
646 } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
648 } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
650 mg = &machine->kmaps;
654 * 'u' means guest os user space.
655 * TODO: We don't support guest user space. Might support late.
657 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
663 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
664 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
667 if ((cpumode == PERF_RECORD_MISC_USER ||
668 cpumode == PERF_RECORD_MISC_KERNEL) &&
675 al->map = map_groups__find(mg, type, al->addr);
676 if (al->map == NULL) {
678 * If this is outside of all known maps, and is a negative
679 * address, try to look it up in the kernel dso, as it might be
680 * a vsyscall or vdso (which executes in user-mode).
682 * XXX This is nasty, we should have a symbol list in the
683 * "[vdso]" dso, but for now lets use the old trick of looking
684 * in the whole kernel symbol list.
686 if ((long long)al->addr < 0 &&
687 cpumode == PERF_RECORD_MISC_USER &&
688 machine && mg != &machine->kmaps) {
689 mg = &machine->kmaps;
694 * Kernel maps might be changed when loading symbols so loading
695 * must be done prior to using kernel maps.
698 map__load(al->map, machine->symbol_filter);
699 al->addr = al->map->map_ip(al->map, al->addr);
703 void thread__find_addr_location(struct thread *thread, struct machine *machine,
704 u8 cpumode, enum map_type type, u64 addr,
705 struct addr_location *al)
707 thread__find_addr_map(thread, machine, cpumode, type, addr, al);
709 al->sym = map__find_symbol(al->map, al->addr,
710 machine->symbol_filter);
715 int perf_event__preprocess_sample(const union perf_event *event,
716 struct machine *machine,
717 struct addr_location *al,
718 struct perf_sample *sample)
720 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
721 struct thread *thread = machine__findnew_thread(machine, sample->pid,
727 if (symbol_conf.comm_list &&
728 !strlist__has_entry(symbol_conf.comm_list, thread->comm))
731 dump_printf(" ... thread: %s:%d\n", thread->comm, thread->tid);
733 * Have we already created the kernel maps for this machine?
735 * This should have happened earlier, when we processed the kernel MMAP
736 * events, but for older perf.data files there was no such thing, so do
739 if (cpumode == PERF_RECORD_MISC_KERNEL &&
740 machine->vmlinux_maps[MAP__FUNCTION] == NULL)
741 machine__create_kernel_maps(machine);
743 thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
745 dump_printf(" ...... dso: %s\n",
746 al->map ? al->map->dso->long_name :
747 al->level == 'H' ? "[hypervisor]" : "<not found>");
749 al->cpu = sample->cpu;
752 struct dso *dso = al->map->dso;
754 if (symbol_conf.dso_list &&
755 (!dso || !(strlist__has_entry(symbol_conf.dso_list,
757 (dso->short_name != dso->long_name &&
758 strlist__has_entry(symbol_conf.dso_list,
762 al->sym = map__find_symbol(al->map, al->addr,
763 machine->symbol_filter);
766 if (symbol_conf.sym_list &&
767 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,