1 #include <linux/types.h>
10 #include "thread_map.h"
11 #include "symbol/kallsyms.h"
13 static const char *perf_event__names[] = {
15 [PERF_RECORD_MMAP] = "MMAP",
16 [PERF_RECORD_MMAP2] = "MMAP2",
17 [PERF_RECORD_LOST] = "LOST",
18 [PERF_RECORD_COMM] = "COMM",
19 [PERF_RECORD_EXIT] = "EXIT",
20 [PERF_RECORD_THROTTLE] = "THROTTLE",
21 [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
22 [PERF_RECORD_FORK] = "FORK",
23 [PERF_RECORD_READ] = "READ",
24 [PERF_RECORD_SAMPLE] = "SAMPLE",
25 [PERF_RECORD_HEADER_ATTR] = "ATTR",
26 [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
27 [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
28 [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
29 [PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
32 const char *perf_event__name(unsigned int id)
34 if (id >= ARRAY_SIZE(perf_event__names))
36 if (!perf_event__names[id])
38 return perf_event__names[id];
41 static struct perf_sample synth_sample = {
50 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
52 char filename[PATH_MAX];
58 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
60 fp = fopen(filename, "r");
62 pr_debug("couldn't open %s\n", filename);
66 while (!comm[0] || (tgid < 0)) {
67 if (fgets(bf, sizeof(bf), fp) == NULL) {
68 pr_warning("couldn't get COMM and pgid, malformed %s\n",
73 if (memcmp(bf, "Name:", 5) == 0) {
75 while (*name && isspace(*name))
77 size = strlen(name) - 1;
80 memcpy(comm, name, size);
83 } else if (memcmp(bf, "Tgid:", 5) == 0) {
85 while (*tgids && isspace(*tgids))
96 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
97 union perf_event *event, pid_t pid,
98 perf_event__handler_t process,
99 struct machine *machine)
104 memset(&event->comm, 0, sizeof(event->comm));
106 if (machine__is_host(machine))
107 tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
108 sizeof(event->comm.comm));
115 event->comm.pid = tgid;
116 event->comm.header.type = PERF_RECORD_COMM;
118 size = strlen(event->comm.comm) + 1;
119 size = PERF_ALIGN(size, sizeof(u64));
120 memset(event->comm.comm + size, 0, machine->id_hdr_size);
121 event->comm.header.size = (sizeof(event->comm) -
122 (sizeof(event->comm.comm) - size) +
123 machine->id_hdr_size);
124 event->comm.tid = pid;
126 if (process(tool, event, &synth_sample, machine) != 0)
133 static int perf_event__synthesize_fork(struct perf_tool *tool,
134 union perf_event *event, pid_t pid,
135 pid_t tgid, perf_event__handler_t process,
136 struct machine *machine)
138 memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
140 /* this is really a clone event but we use fork to synthesize it */
141 event->fork.ppid = tgid;
142 event->fork.ptid = tgid;
143 event->fork.pid = tgid;
144 event->fork.tid = pid;
145 event->fork.header.type = PERF_RECORD_FORK;
147 event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
149 if (process(tool, event, &synth_sample, machine) != 0)
155 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
156 union perf_event *event,
157 pid_t pid, pid_t tgid,
158 perf_event__handler_t process,
159 struct machine *machine,
162 char filename[PATH_MAX];
166 if (machine__is_default_guest(machine))
169 snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
170 machine->root_dir, pid);
172 fp = fopen(filename, "r");
175 * We raced with a task exiting - just return:
177 pr_debug("couldn't open %s\n", filename);
181 event->header.type = PERF_RECORD_MMAP;
186 char execname[PATH_MAX];
187 char anonstr[] = "//anon";
191 if (fgets(bf, sizeof(bf), fp) == NULL)
194 /* ensure null termination since stack will be reused. */
195 strcpy(execname, "");
197 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
198 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
199 &event->mmap.start, &event->mmap.len, prot,
203 * Anon maps don't have the execname.
208 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
210 if (machine__is_host(machine))
211 event->header.misc = PERF_RECORD_MISC_USER;
213 event->header.misc = PERF_RECORD_MISC_GUEST_USER;
215 if (prot[2] != 'x') {
216 if (!mmap_data || prot[0] != 'r')
219 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
222 if (!strcmp(execname, ""))
223 strcpy(execname, anonstr);
225 size = strlen(execname) + 1;
226 memcpy(event->mmap.filename, execname, size);
227 size = PERF_ALIGN(size, sizeof(u64));
228 event->mmap.len -= event->mmap.start;
229 event->mmap.header.size = (sizeof(event->mmap) -
230 (sizeof(event->mmap.filename) - size));
231 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
232 event->mmap.header.size += machine->id_hdr_size;
233 event->mmap.pid = tgid;
234 event->mmap.tid = pid;
236 if (process(tool, event, &synth_sample, machine) != 0) {
246 int perf_event__synthesize_modules(struct perf_tool *tool,
247 perf_event__handler_t process,
248 struct machine *machine)
252 struct map_groups *kmaps = &machine->kmaps;
253 union perf_event *event = zalloc((sizeof(event->mmap) +
254 machine->id_hdr_size));
256 pr_debug("Not enough memory synthesizing mmap event "
257 "for kernel modules\n");
261 event->header.type = PERF_RECORD_MMAP;
264 * kernel uses 0 for user space maps, see kernel/perf_event.c
267 if (machine__is_host(machine))
268 event->header.misc = PERF_RECORD_MISC_KERNEL;
270 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
272 for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
273 nd; nd = rb_next(nd)) {
275 struct map *pos = rb_entry(nd, struct map, rb_node);
277 if (pos->dso->kernel)
280 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
281 event->mmap.header.type = PERF_RECORD_MMAP;
282 event->mmap.header.size = (sizeof(event->mmap) -
283 (sizeof(event->mmap.filename) - size));
284 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
285 event->mmap.header.size += machine->id_hdr_size;
286 event->mmap.start = pos->start;
287 event->mmap.len = pos->end - pos->start;
288 event->mmap.pid = machine->pid;
290 memcpy(event->mmap.filename, pos->dso->long_name,
291 pos->dso->long_name_len + 1);
292 if (process(tool, event, &synth_sample, machine) != 0) {
302 static int __event__synthesize_thread(union perf_event *comm_event,
303 union perf_event *mmap_event,
304 union perf_event *fork_event,
306 perf_event__handler_t process,
307 struct perf_tool *tool,
308 struct machine *machine, bool mmap_data)
310 char filename[PATH_MAX];
312 struct dirent dirent, *next;
315 /* special case: only send one comm event using passed in pid */
317 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
323 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
324 process, machine, mmap_data);
327 if (machine__is_default_guest(machine))
330 snprintf(filename, sizeof(filename), "%s/proc/%d/task",
331 machine->root_dir, pid);
333 tasks = opendir(filename);
335 pr_debug("couldn't open %s\n", filename);
339 while (!readdir_r(tasks, &dirent, &next) && next) {
344 _pid = strtol(dirent.d_name, &end, 10);
348 tgid = perf_event__synthesize_comm(tool, comm_event, _pid,
354 /* process the parent's maps too */
355 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
356 process, machine, mmap_data);
358 /* only fork the tid's map, to save time */
359 rc = perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
371 int perf_event__synthesize_thread_map(struct perf_tool *tool,
372 struct thread_map *threads,
373 perf_event__handler_t process,
374 struct machine *machine,
377 union perf_event *comm_event, *mmap_event, *fork_event;
378 int err = -1, thread, j;
380 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
381 if (comm_event == NULL)
384 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
385 if (mmap_event == NULL)
388 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
389 if (fork_event == NULL)
393 for (thread = 0; thread < threads->nr; ++thread) {
394 if (__event__synthesize_thread(comm_event, mmap_event,
396 threads->map[thread], 0,
397 process, tool, machine,
404 * comm.pid is set to thread group id by
405 * perf_event__synthesize_comm
407 if ((int) comm_event->comm.pid != threads->map[thread]) {
408 bool need_leader = true;
410 /* is thread group leader in thread_map? */
411 for (j = 0; j < threads->nr; ++j) {
412 if ((int) comm_event->comm.pid == threads->map[j]) {
418 /* if not, generate events for it */
420 __event__synthesize_thread(comm_event, mmap_event,
422 comm_event->comm.pid, 0,
423 process, tool, machine,
439 int perf_event__synthesize_threads(struct perf_tool *tool,
440 perf_event__handler_t process,
441 struct machine *machine, bool mmap_data)
444 char proc_path[PATH_MAX];
445 struct dirent dirent, *next;
446 union perf_event *comm_event, *mmap_event, *fork_event;
449 if (machine__is_default_guest(machine))
452 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
453 if (comm_event == NULL)
456 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
457 if (mmap_event == NULL)
460 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
461 if (fork_event == NULL)
464 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
465 proc = opendir(proc_path);
470 while (!readdir_r(proc, &dirent, &next) && next) {
472 pid_t pid = strtol(dirent.d_name, &end, 10);
474 if (*end) /* only interested in proper numerical dirents */
477 * We may race with exiting thread, so don't stop just because
478 * one thread couldn't be synthesized.
480 __event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
481 1, process, tool, machine, mmap_data);
496 struct process_symbol_args {
501 static int find_symbol_cb(void *arg, const char *name, char type,
504 struct process_symbol_args *args = arg;
507 * Must be a function or at least an alias, as in PARISC64, where "_text" is
508 * an 'A' to the same address as "_stext".
510 if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
511 type == 'A') || strcmp(name, args->name))
518 u64 kallsyms__get_function_start(const char *kallsyms_filename,
519 const char *symbol_name)
521 struct process_symbol_args args = { .name = symbol_name, };
523 if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
529 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
530 perf_event__handler_t process,
531 struct machine *machine)
534 const char *mmap_name;
535 char name_buff[PATH_MAX];
540 * We should get this from /sys/kernel/sections/.text, but till that is
541 * available use this, and after it is use this as a fallback for older
544 union perf_event *event = zalloc((sizeof(event->mmap) +
545 machine->id_hdr_size));
547 pr_debug("Not enough memory synthesizing mmap event "
548 "for kernel modules\n");
552 mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
553 if (machine__is_host(machine)) {
555 * kernel uses PERF_RECORD_MISC_USER for user space maps,
556 * see kernel/perf_event.c __perf_event_mmap
558 event->header.misc = PERF_RECORD_MISC_KERNEL;
560 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
563 map = machine->vmlinux_maps[MAP__FUNCTION];
564 kmap = map__kmap(map);
565 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
566 "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
567 size = PERF_ALIGN(size, sizeof(u64));
568 event->mmap.header.type = PERF_RECORD_MMAP;
569 event->mmap.header.size = (sizeof(event->mmap) -
570 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
571 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
572 event->mmap.start = map->start;
573 event->mmap.len = map->end - event->mmap.start;
574 event->mmap.pid = machine->pid;
576 err = process(tool, event, &synth_sample, machine);
582 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
584 return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
587 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
588 union perf_event *event,
589 struct perf_sample *sample,
590 struct machine *machine)
592 return machine__process_comm_event(machine, event, sample);
595 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
596 union perf_event *event,
597 struct perf_sample *sample,
598 struct machine *machine)
600 return machine__process_lost_event(machine, event, sample);
603 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
605 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
606 event->mmap.pid, event->mmap.tid, event->mmap.start,
607 event->mmap.len, event->mmap.pgoff,
608 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
609 event->mmap.filename);
612 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
614 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
615 " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
616 event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
617 event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
618 event->mmap2.min, event->mmap2.ino,
619 event->mmap2.ino_generation,
620 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
621 event->mmap2.filename);
624 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
625 union perf_event *event,
626 struct perf_sample *sample,
627 struct machine *machine)
629 return machine__process_mmap_event(machine, event, sample);
632 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
633 union perf_event *event,
634 struct perf_sample *sample,
635 struct machine *machine)
637 return machine__process_mmap2_event(machine, event, sample);
640 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
642 return fprintf(fp, "(%d:%d):(%d:%d)\n",
643 event->fork.pid, event->fork.tid,
644 event->fork.ppid, event->fork.ptid);
647 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
648 union perf_event *event,
649 struct perf_sample *sample,
650 struct machine *machine)
652 return machine__process_fork_event(machine, event, sample);
655 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
656 union perf_event *event,
657 struct perf_sample *sample,
658 struct machine *machine)
660 return machine__process_exit_event(machine, event, sample);
663 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
665 size_t ret = fprintf(fp, "PERF_RECORD_%s",
666 perf_event__name(event->header.type));
668 switch (event->header.type) {
669 case PERF_RECORD_COMM:
670 ret += perf_event__fprintf_comm(event, fp);
672 case PERF_RECORD_FORK:
673 case PERF_RECORD_EXIT:
674 ret += perf_event__fprintf_task(event, fp);
676 case PERF_RECORD_MMAP:
677 ret += perf_event__fprintf_mmap(event, fp);
679 case PERF_RECORD_MMAP2:
680 ret += perf_event__fprintf_mmap2(event, fp);
683 ret += fprintf(fp, "\n");
689 int perf_event__process(struct perf_tool *tool __maybe_unused,
690 union perf_event *event,
691 struct perf_sample *sample,
692 struct machine *machine)
694 return machine__process_event(machine, event, sample);
697 void thread__find_addr_map(struct thread *thread,
698 struct machine *machine, u8 cpumode,
699 enum map_type type, u64 addr,
700 struct addr_location *al)
702 struct map_groups *mg = &thread->mg;
703 bool load_map = false;
705 al->machine = machine;
708 al->cpumode = cpumode;
711 if (machine == NULL) {
716 if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
718 mg = &machine->kmaps;
720 } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
722 } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
724 mg = &machine->kmaps;
726 } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
732 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
733 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
735 al->filtered |= (1 << HIST_FILTER__GUEST);
736 if ((cpumode == PERF_RECORD_MISC_USER ||
737 cpumode == PERF_RECORD_MISC_KERNEL) &&
739 al->filtered |= (1 << HIST_FILTER__HOST);
744 al->map = map_groups__find(mg, type, al->addr);
745 if (al->map == NULL) {
747 * If this is outside of all known maps, and is a negative
748 * address, try to look it up in the kernel dso, as it might be
749 * a vsyscall or vdso (which executes in user-mode).
751 * XXX This is nasty, we should have a symbol list in the
752 * "[vdso]" dso, but for now lets use the old trick of looking
753 * in the whole kernel symbol list.
755 if ((long long)al->addr < 0 &&
756 cpumode == PERF_RECORD_MISC_USER &&
757 machine && mg != &machine->kmaps) {
758 mg = &machine->kmaps;
763 * Kernel maps might be changed when loading symbols so loading
764 * must be done prior to using kernel maps.
767 map__load(al->map, machine->symbol_filter);
768 al->addr = al->map->map_ip(al->map, al->addr);
772 void thread__find_addr_location(struct thread *thread, struct machine *machine,
773 u8 cpumode, enum map_type type, u64 addr,
774 struct addr_location *al)
776 thread__find_addr_map(thread, machine, cpumode, type, addr, al);
778 al->sym = map__find_symbol(al->map, al->addr,
779 machine->symbol_filter);
784 int perf_event__preprocess_sample(const union perf_event *event,
785 struct machine *machine,
786 struct addr_location *al,
787 struct perf_sample *sample)
789 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
790 struct thread *thread = machine__findnew_thread(machine, sample->pid,
796 dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
798 * Have we already created the kernel maps for this machine?
800 * This should have happened earlier, when we processed the kernel MMAP
801 * events, but for older perf.data files there was no such thing, so do
804 if (cpumode == PERF_RECORD_MISC_KERNEL &&
805 machine->vmlinux_maps[MAP__FUNCTION] == NULL)
806 machine__create_kernel_maps(machine);
808 thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
810 dump_printf(" ...... dso: %s\n",
811 al->map ? al->map->dso->long_name :
812 al->level == 'H' ? "[hypervisor]" : "<not found>");
814 if (thread__is_filtered(thread))
815 al->filtered |= (1 << HIST_FILTER__THREAD);
818 al->cpu = sample->cpu;
821 struct dso *dso = al->map->dso;
823 if (symbol_conf.dso_list &&
824 (!dso || !(strlist__has_entry(symbol_conf.dso_list,
826 (dso->short_name != dso->long_name &&
827 strlist__has_entry(symbol_conf.dso_list,
828 dso->long_name))))) {
829 al->filtered |= (1 << HIST_FILTER__DSO);
832 al->sym = map__find_symbol(al->map, al->addr,
833 machine->symbol_filter);
836 if (symbol_conf.sym_list &&
837 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
839 al->filtered |= (1 << HIST_FILTER__SYMBOL);