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 if (machine__is_host(machine))
110 tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
111 sizeof(event->comm.comm));
118 event->comm.pid = tgid;
119 event->comm.header.type = PERF_RECORD_COMM;
121 size = strlen(event->comm.comm) + 1;
122 size = PERF_ALIGN(size, sizeof(u64));
123 memset(event->comm.comm + size, 0, machine->id_hdr_size);
124 event->comm.header.size = (sizeof(event->comm) -
125 (sizeof(event->comm.comm) - size) +
126 machine->id_hdr_size);
128 event->comm.tid = pid;
130 if (process(tool, event, &synth_sample, machine) != 0)
136 if (machine__is_default_guest(machine))
139 snprintf(filename, sizeof(filename), "%s/proc/%d/task",
140 machine->root_dir, pid);
142 tasks = opendir(filename);
144 pr_debug("couldn't open %s\n", filename);
148 while (!readdir_r(tasks, &dirent, &next) && next) {
150 pid = strtol(dirent.d_name, &end, 10);
154 /* already have tgid; jut want to update the comm */
155 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
156 sizeof(event->comm.comm));
158 size = strlen(event->comm.comm) + 1;
159 size = PERF_ALIGN(size, sizeof(u64));
160 memset(event->comm.comm + size, 0, machine->id_hdr_size);
161 event->comm.header.size = (sizeof(event->comm) -
162 (sizeof(event->comm.comm) - size) +
163 machine->id_hdr_size);
165 event->comm.tid = pid;
167 if (process(tool, event, &synth_sample, machine) != 0) {
178 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
179 union perf_event *event,
180 pid_t pid, pid_t tgid,
181 perf_event__handler_t process,
182 struct machine *machine,
185 char filename[PATH_MAX];
189 if (machine__is_default_guest(machine))
192 snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
193 machine->root_dir, pid);
195 fp = fopen(filename, "r");
198 * We raced with a task exiting - just return:
200 pr_debug("couldn't open %s\n", filename);
204 event->header.type = PERF_RECORD_MMAP;
209 char execname[PATH_MAX];
210 char anonstr[] = "//anon";
214 if (fgets(bf, sizeof(bf), fp) == NULL)
217 /* ensure null termination since stack will be reused. */
218 strcpy(execname, "");
220 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
221 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
222 &event->mmap.start, &event->mmap.len, prot,
226 * Anon maps don't have the execname.
231 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
233 if (machine__is_host(machine))
234 event->header.misc = PERF_RECORD_MISC_USER;
236 event->header.misc = PERF_RECORD_MISC_GUEST_USER;
238 if (prot[2] != 'x') {
239 if (!mmap_data || prot[0] != 'r')
242 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
245 if (!strcmp(execname, ""))
246 strcpy(execname, anonstr);
248 size = strlen(execname) + 1;
249 memcpy(event->mmap.filename, execname, size);
250 size = PERF_ALIGN(size, sizeof(u64));
251 event->mmap.len -= event->mmap.start;
252 event->mmap.header.size = (sizeof(event->mmap) -
253 (sizeof(event->mmap.filename) - size));
254 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
255 event->mmap.header.size += machine->id_hdr_size;
256 event->mmap.pid = tgid;
257 event->mmap.tid = pid;
259 if (process(tool, event, &synth_sample, machine) != 0) {
269 int perf_event__synthesize_modules(struct perf_tool *tool,
270 perf_event__handler_t process,
271 struct machine *machine)
275 struct map_groups *kmaps = &machine->kmaps;
276 union perf_event *event = zalloc((sizeof(event->mmap) +
277 machine->id_hdr_size));
279 pr_debug("Not enough memory synthesizing mmap event "
280 "for kernel modules\n");
284 event->header.type = PERF_RECORD_MMAP;
287 * kernel uses 0 for user space maps, see kernel/perf_event.c
290 if (machine__is_host(machine))
291 event->header.misc = PERF_RECORD_MISC_KERNEL;
293 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
295 for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
296 nd; nd = rb_next(nd)) {
298 struct map *pos = rb_entry(nd, struct map, rb_node);
300 if (pos->dso->kernel)
303 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
304 event->mmap.header.type = PERF_RECORD_MMAP;
305 event->mmap.header.size = (sizeof(event->mmap) -
306 (sizeof(event->mmap.filename) - size));
307 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
308 event->mmap.header.size += machine->id_hdr_size;
309 event->mmap.start = pos->start;
310 event->mmap.len = pos->end - pos->start;
311 event->mmap.pid = machine->pid;
313 memcpy(event->mmap.filename, pos->dso->long_name,
314 pos->dso->long_name_len + 1);
315 if (process(tool, event, &synth_sample, machine) != 0) {
325 static int __event__synthesize_thread(union perf_event *comm_event,
326 union perf_event *mmap_event,
328 perf_event__handler_t process,
329 struct perf_tool *tool,
330 struct machine *machine, bool mmap_data)
332 pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
336 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
337 process, machine, mmap_data);
340 int perf_event__synthesize_thread_map(struct perf_tool *tool,
341 struct thread_map *threads,
342 perf_event__handler_t process,
343 struct machine *machine,
346 union perf_event *comm_event, *mmap_event;
347 int err = -1, thread, j;
349 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
350 if (comm_event == NULL)
353 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
354 if (mmap_event == NULL)
358 for (thread = 0; thread < threads->nr; ++thread) {
359 if (__event__synthesize_thread(comm_event, mmap_event,
360 threads->map[thread], 0,
361 process, tool, machine,
368 * comm.pid is set to thread group id by
369 * perf_event__synthesize_comm
371 if ((int) comm_event->comm.pid != threads->map[thread]) {
372 bool need_leader = true;
374 /* is thread group leader in thread_map? */
375 for (j = 0; j < threads->nr; ++j) {
376 if ((int) comm_event->comm.pid == threads->map[j]) {
382 /* if not, generate events for it */
384 __event__synthesize_thread(comm_event, mmap_event,
385 comm_event->comm.pid, 0,
386 process, tool, machine,
400 int perf_event__synthesize_threads(struct perf_tool *tool,
401 perf_event__handler_t process,
402 struct machine *machine, bool mmap_data)
405 char proc_path[PATH_MAX];
406 struct dirent dirent, *next;
407 union perf_event *comm_event, *mmap_event;
410 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
411 if (comm_event == NULL)
414 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
415 if (mmap_event == NULL)
418 if (machine__is_default_guest(machine))
421 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
422 proc = opendir(proc_path);
427 while (!readdir_r(proc, &dirent, &next) && next) {
429 pid_t pid = strtol(dirent.d_name, &end, 10);
431 if (*end) /* only interested in proper numerical dirents */
434 * We may race with exiting thread, so don't stop just because
435 * one thread couldn't be synthesized.
437 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
438 process, tool, machine, mmap_data);
451 struct process_symbol_args {
456 static int find_symbol_cb(void *arg, const char *name, char type,
459 struct process_symbol_args *args = arg;
462 * Must be a function or at least an alias, as in PARISC64, where "_text" is
463 * an 'A' to the same address as "_stext".
465 if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
466 type == 'A') || strcmp(name, args->name))
473 u64 kallsyms__get_function_start(const char *kallsyms_filename,
474 const char *symbol_name)
476 struct process_symbol_args args = { .name = symbol_name, };
478 if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
484 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
485 perf_event__handler_t process,
486 struct machine *machine)
489 const char *mmap_name;
490 char name_buff[PATH_MAX];
495 * We should get this from /sys/kernel/sections/.text, but till that is
496 * available use this, and after it is use this as a fallback for older
499 union perf_event *event = zalloc((sizeof(event->mmap) +
500 machine->id_hdr_size));
502 pr_debug("Not enough memory synthesizing mmap event "
503 "for kernel modules\n");
507 mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
508 if (machine__is_host(machine)) {
510 * kernel uses PERF_RECORD_MISC_USER for user space maps,
511 * see kernel/perf_event.c __perf_event_mmap
513 event->header.misc = PERF_RECORD_MISC_KERNEL;
515 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
518 map = machine->vmlinux_maps[MAP__FUNCTION];
519 kmap = map__kmap(map);
520 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
521 "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
522 size = PERF_ALIGN(size, sizeof(u64));
523 event->mmap.header.type = PERF_RECORD_MMAP;
524 event->mmap.header.size = (sizeof(event->mmap) -
525 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
526 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
527 event->mmap.start = map->start;
528 event->mmap.len = map->end - event->mmap.start;
529 event->mmap.pid = machine->pid;
531 err = process(tool, event, &synth_sample, machine);
537 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
539 return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
542 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
543 union perf_event *event,
544 struct perf_sample *sample,
545 struct machine *machine)
547 return machine__process_comm_event(machine, event, sample);
550 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
551 union perf_event *event,
552 struct perf_sample *sample,
553 struct machine *machine)
555 return machine__process_lost_event(machine, event, sample);
558 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
560 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
561 event->mmap.pid, event->mmap.tid, event->mmap.start,
562 event->mmap.len, event->mmap.pgoff,
563 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
564 event->mmap.filename);
567 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
569 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
570 " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
571 event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
572 event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
573 event->mmap2.min, event->mmap2.ino,
574 event->mmap2.ino_generation,
575 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
576 event->mmap2.filename);
579 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
580 union perf_event *event,
581 struct perf_sample *sample,
582 struct machine *machine)
584 return machine__process_mmap_event(machine, event, sample);
587 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
588 union perf_event *event,
589 struct perf_sample *sample,
590 struct machine *machine)
592 return machine__process_mmap2_event(machine, event, sample);
595 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
597 return fprintf(fp, "(%d:%d):(%d:%d)\n",
598 event->fork.pid, event->fork.tid,
599 event->fork.ppid, event->fork.ptid);
602 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
603 union perf_event *event,
604 struct perf_sample *sample,
605 struct machine *machine)
607 return machine__process_fork_event(machine, event, sample);
610 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
611 union perf_event *event,
612 struct perf_sample *sample,
613 struct machine *machine)
615 return machine__process_exit_event(machine, event, sample);
618 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
620 size_t ret = fprintf(fp, "PERF_RECORD_%s",
621 perf_event__name(event->header.type));
623 switch (event->header.type) {
624 case PERF_RECORD_COMM:
625 ret += perf_event__fprintf_comm(event, fp);
627 case PERF_RECORD_FORK:
628 case PERF_RECORD_EXIT:
629 ret += perf_event__fprintf_task(event, fp);
631 case PERF_RECORD_MMAP:
632 ret += perf_event__fprintf_mmap(event, fp);
634 case PERF_RECORD_MMAP2:
635 ret += perf_event__fprintf_mmap2(event, fp);
638 ret += fprintf(fp, "\n");
644 int perf_event__process(struct perf_tool *tool __maybe_unused,
645 union perf_event *event,
646 struct perf_sample *sample,
647 struct machine *machine)
649 return machine__process_event(machine, event, sample);
652 void thread__find_addr_map(struct thread *thread,
653 struct machine *machine, u8 cpumode,
654 enum map_type type, u64 addr,
655 struct addr_location *al)
657 struct map_groups *mg = &thread->mg;
658 bool load_map = false;
660 al->machine = machine;
663 al->cpumode = cpumode;
664 al->filtered = false;
666 if (machine == NULL) {
671 if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
673 mg = &machine->kmaps;
675 } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
677 } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
679 mg = &machine->kmaps;
681 } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
687 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
688 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
691 if ((cpumode == PERF_RECORD_MISC_USER ||
692 cpumode == PERF_RECORD_MISC_KERNEL) &&
699 al->map = map_groups__find(mg, type, al->addr);
700 if (al->map == NULL) {
702 * If this is outside of all known maps, and is a negative
703 * address, try to look it up in the kernel dso, as it might be
704 * a vsyscall or vdso (which executes in user-mode).
706 * XXX This is nasty, we should have a symbol list in the
707 * "[vdso]" dso, but for now lets use the old trick of looking
708 * in the whole kernel symbol list.
710 if ((long long)al->addr < 0 &&
711 cpumode == PERF_RECORD_MISC_USER &&
712 machine && mg != &machine->kmaps) {
713 mg = &machine->kmaps;
718 * Kernel maps might be changed when loading symbols so loading
719 * must be done prior to using kernel maps.
722 map__load(al->map, machine->symbol_filter);
723 al->addr = al->map->map_ip(al->map, al->addr);
727 void thread__find_addr_location(struct thread *thread, struct machine *machine,
728 u8 cpumode, enum map_type type, u64 addr,
729 struct addr_location *al)
731 thread__find_addr_map(thread, machine, cpumode, type, addr, al);
733 al->sym = map__find_symbol(al->map, al->addr,
734 machine->symbol_filter);
739 int perf_event__preprocess_sample(const union perf_event *event,
740 struct machine *machine,
741 struct addr_location *al,
742 struct perf_sample *sample)
744 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
745 struct thread *thread = machine__findnew_thread(machine, sample->pid,
751 if (thread__is_filtered(thread))
754 dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
756 * Have we already created the kernel maps for this machine?
758 * This should have happened earlier, when we processed the kernel MMAP
759 * events, but for older perf.data files there was no such thing, so do
762 if (cpumode == PERF_RECORD_MISC_KERNEL &&
763 machine->vmlinux_maps[MAP__FUNCTION] == NULL)
764 machine__create_kernel_maps(machine);
766 thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
768 dump_printf(" ...... dso: %s\n",
769 al->map ? al->map->dso->long_name :
770 al->level == 'H' ? "[hypervisor]" : "<not found>");
772 al->cpu = sample->cpu;
775 struct dso *dso = al->map->dso;
777 if (symbol_conf.dso_list &&
778 (!dso || !(strlist__has_entry(symbol_conf.dso_list,
780 (dso->short_name != dso->long_name &&
781 strlist__has_entry(symbol_conf.dso_list,
785 al->sym = map__find_symbol(al->map, al->addr,
786 machine->symbol_filter);
789 if (symbol_conf.sym_list &&
790 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,