1 #include <linux/types.h>
8 #include "thread_map.h"
10 static const char *perf_event__names[] = {
12 [PERF_RECORD_MMAP] = "MMAP",
13 [PERF_RECORD_LOST] = "LOST",
14 [PERF_RECORD_COMM] = "COMM",
15 [PERF_RECORD_EXIT] = "EXIT",
16 [PERF_RECORD_THROTTLE] = "THROTTLE",
17 [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
18 [PERF_RECORD_FORK] = "FORK",
19 [PERF_RECORD_READ] = "READ",
20 [PERF_RECORD_SAMPLE] = "SAMPLE",
21 [PERF_RECORD_HEADER_ATTR] = "ATTR",
22 [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
23 [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
24 [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
25 [PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
28 const char *perf_event__name(unsigned int id)
30 if (id >= ARRAY_SIZE(perf_event__names))
32 if (!perf_event__names[id])
34 return perf_event__names[id];
37 static struct perf_sample synth_sample = {
46 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
48 char filename[PATH_MAX];
54 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
56 fp = fopen(filename, "r");
58 pr_debug("couldn't open %s\n", filename);
62 while (!comm[0] || (tgid < 0)) {
63 if (fgets(bf, sizeof(bf), fp) == NULL) {
64 pr_warning("couldn't get COMM and pgid, malformed %s\n",
69 if (memcmp(bf, "Name:", 5) == 0) {
71 while (*name && isspace(*name))
73 size = strlen(name) - 1;
76 memcpy(comm, name, size);
79 } else if (memcmp(bf, "Tgid:", 5) == 0) {
81 while (*tgids && isspace(*tgids))
92 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
93 union perf_event *event, pid_t pid,
95 perf_event__handler_t process,
96 struct machine *machine)
98 char filename[PATH_MAX];
101 struct dirent dirent, *next;
104 memset(&event->comm, 0, sizeof(event->comm));
106 tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
107 sizeof(event->comm.comm));
111 event->comm.pid = tgid;
112 event->comm.header.type = PERF_RECORD_COMM;
114 size = strlen(event->comm.comm) + 1;
115 size = PERF_ALIGN(size, sizeof(u64));
116 memset(event->comm.comm + size, 0, machine->id_hdr_size);
117 event->comm.header.size = (sizeof(event->comm) -
118 (sizeof(event->comm.comm) - size) +
119 machine->id_hdr_size);
121 event->comm.tid = pid;
123 if (process(tool, event, &synth_sample, machine) != 0)
129 snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
131 tasks = opendir(filename);
133 pr_debug("couldn't open %s\n", filename);
137 while (!readdir_r(tasks, &dirent, &next) && next) {
139 pid = strtol(dirent.d_name, &end, 10);
143 /* already have tgid; jut want to update the comm */
144 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
145 sizeof(event->comm.comm));
147 size = strlen(event->comm.comm) + 1;
148 size = PERF_ALIGN(size, sizeof(u64));
149 memset(event->comm.comm + size, 0, machine->id_hdr_size);
150 event->comm.header.size = (sizeof(event->comm) -
151 (sizeof(event->comm.comm) - size) +
152 machine->id_hdr_size);
154 event->comm.tid = pid;
156 if (process(tool, event, &synth_sample, machine) != 0) {
167 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
168 union perf_event *event,
169 pid_t pid, pid_t tgid,
170 perf_event__handler_t process,
171 struct machine *machine)
173 char filename[PATH_MAX];
177 snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
179 fp = fopen(filename, "r");
182 * We raced with a task exiting - just return:
184 pr_debug("couldn't open %s\n", filename);
188 event->header.type = PERF_RECORD_MMAP;
190 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
192 event->header.misc = PERF_RECORD_MISC_USER;
195 char bf[BUFSIZ], *pbf = bf;
198 if (fgets(bf, sizeof(bf), fp) == NULL)
201 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
202 n = hex2u64(pbf, &event->mmap.start);
206 n = hex2u64(pbf, &event->mmap.len);
210 if (*pbf == 'x') { /* vm_exec */
211 char anonstr[] = "//anon\n";
212 char *execname = strchr(bf, '/');
215 if (execname == NULL)
216 execname = strstr(bf, "[vdso]");
218 /* Catch anonymous mmaps */
219 if ((execname == NULL) && !strstr(bf, "["))
222 if (execname == NULL)
226 n = hex2u64(pbf, &event->mmap.pgoff);
228 size = strlen(execname);
229 execname[size - 1] = '\0'; /* Remove \n */
230 memcpy(event->mmap.filename, execname, size);
231 size = PERF_ALIGN(size, sizeof(u64));
232 event->mmap.len -= event->mmap.start;
233 event->mmap.header.size = (sizeof(event->mmap) -
234 (sizeof(event->mmap.filename) - size));
235 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
236 event->mmap.header.size += machine->id_hdr_size;
237 event->mmap.pid = tgid;
238 event->mmap.tid = pid;
240 if (process(tool, event, &synth_sample, machine) != 0) {
251 int perf_event__synthesize_modules(struct perf_tool *tool,
252 perf_event__handler_t process,
253 struct machine *machine)
257 struct map_groups *kmaps = &machine->kmaps;
258 union perf_event *event = zalloc((sizeof(event->mmap) +
259 machine->id_hdr_size));
261 pr_debug("Not enough memory synthesizing mmap event "
262 "for kernel modules\n");
266 event->header.type = PERF_RECORD_MMAP;
269 * kernel uses 0 for user space maps, see kernel/perf_event.c
272 if (machine__is_host(machine))
273 event->header.misc = PERF_RECORD_MISC_KERNEL;
275 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
277 for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
278 nd; nd = rb_next(nd)) {
280 struct map *pos = rb_entry(nd, struct map, rb_node);
282 if (pos->dso->kernel)
285 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
286 event->mmap.header.type = PERF_RECORD_MMAP;
287 event->mmap.header.size = (sizeof(event->mmap) -
288 (sizeof(event->mmap.filename) - size));
289 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
290 event->mmap.header.size += machine->id_hdr_size;
291 event->mmap.start = pos->start;
292 event->mmap.len = pos->end - pos->start;
293 event->mmap.pid = machine->pid;
295 memcpy(event->mmap.filename, pos->dso->long_name,
296 pos->dso->long_name_len + 1);
297 if (process(tool, event, &synth_sample, machine) != 0) {
307 static int __event__synthesize_thread(union perf_event *comm_event,
308 union perf_event *mmap_event,
310 perf_event__handler_t process,
311 struct perf_tool *tool,
312 struct machine *machine)
314 pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
318 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
322 int perf_event__synthesize_thread_map(struct perf_tool *tool,
323 struct thread_map *threads,
324 perf_event__handler_t process,
325 struct machine *machine)
327 union perf_event *comm_event, *mmap_event;
328 int err = -1, thread, j;
330 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
331 if (comm_event == NULL)
334 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
335 if (mmap_event == NULL)
339 for (thread = 0; thread < threads->nr; ++thread) {
340 if (__event__synthesize_thread(comm_event, mmap_event,
341 threads->map[thread], 0,
342 process, tool, machine)) {
348 * comm.pid is set to thread group id by
349 * perf_event__synthesize_comm
351 if ((int) comm_event->comm.pid != threads->map[thread]) {
352 bool need_leader = true;
354 /* is thread group leader in thread_map? */
355 for (j = 0; j < threads->nr; ++j) {
356 if ((int) comm_event->comm.pid == threads->map[j]) {
362 /* if not, generate events for it */
364 __event__synthesize_thread(comm_event,
366 comm_event->comm.pid, 0,
367 process, tool, machine)) {
380 int perf_event__synthesize_threads(struct perf_tool *tool,
381 perf_event__handler_t process,
382 struct machine *machine)
385 struct dirent dirent, *next;
386 union perf_event *comm_event, *mmap_event;
389 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
390 if (comm_event == NULL)
393 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
394 if (mmap_event == NULL)
397 proc = opendir("/proc");
401 while (!readdir_r(proc, &dirent, &next) && next) {
403 pid_t pid = strtol(dirent.d_name, &end, 10);
405 if (*end) /* only interested in proper numerical dirents */
408 if (__event__synthesize_thread(comm_event, mmap_event, pid, 1,
409 process, tool, machine) != 0) {
426 struct process_symbol_args {
431 static int find_symbol_cb(void *arg, const char *name, char type,
434 struct process_symbol_args *args = arg;
437 * Must be a function or at least an alias, as in PARISC64, where "_text" is
438 * an 'A' to the same address as "_stext".
440 if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
441 type == 'A') || strcmp(name, args->name))
448 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
449 perf_event__handler_t process,
450 struct machine *machine,
451 const char *symbol_name)
454 const char *filename, *mmap_name;
456 char name_buff[PATH_MAX];
460 * We should get this from /sys/kernel/sections/.text, but till that is
461 * available use this, and after it is use this as a fallback for older
464 struct process_symbol_args args = { .name = symbol_name, };
465 union perf_event *event = zalloc((sizeof(event->mmap) +
466 machine->id_hdr_size));
468 pr_debug("Not enough memory synthesizing mmap event "
469 "for kernel modules\n");
473 mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
474 if (machine__is_host(machine)) {
476 * kernel uses PERF_RECORD_MISC_USER for user space maps,
477 * see kernel/perf_event.c __perf_event_mmap
479 event->header.misc = PERF_RECORD_MISC_KERNEL;
480 filename = "/proc/kallsyms";
482 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
483 if (machine__is_default_guest(machine))
484 filename = (char *) symbol_conf.default_guest_kallsyms;
486 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
491 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 struct thread *thread = machine__findnew_thread(machine, event->comm.tid);
525 perf_event__fprintf_comm(event, stdout);
527 if (thread == NULL || thread__set_comm(thread, event->comm.comm)) {
528 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
535 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
536 union perf_event *event,
537 struct perf_sample *sample __maybe_unused,
538 struct machine *machine __maybe_unused)
540 dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
541 event->lost.id, event->lost.lost);
545 static void perf_event__set_kernel_mmap_len(union perf_event *event,
548 maps[MAP__FUNCTION]->start = event->mmap.start;
549 maps[MAP__FUNCTION]->end = event->mmap.start + event->mmap.len;
551 * Be a bit paranoid here, some perf.data file came with
552 * a zero sized synthesized MMAP event for the kernel.
554 if (maps[MAP__FUNCTION]->end == 0)
555 maps[MAP__FUNCTION]->end = ~0ULL;
558 static int perf_event__process_kernel_mmap(struct perf_tool *tool
560 union perf_event *event,
561 struct machine *machine)
564 char kmmap_prefix[PATH_MAX];
565 enum dso_kernel_type kernel_type;
568 machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
569 if (machine__is_host(machine))
570 kernel_type = DSO_TYPE_KERNEL;
572 kernel_type = DSO_TYPE_GUEST_KERNEL;
574 is_kernel_mmap = memcmp(event->mmap.filename,
576 strlen(kmmap_prefix) - 1) == 0;
577 if (event->mmap.filename[0] == '/' ||
578 (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
580 char short_module_name[1024];
583 if (event->mmap.filename[0] == '/') {
584 name = strrchr(event->mmap.filename, '/');
589 dot = strrchr(name, '.');
592 snprintf(short_module_name, sizeof(short_module_name),
593 "[%.*s]", (int)(dot - name), name);
594 strxfrchar(short_module_name, '-', '_');
596 strcpy(short_module_name, event->mmap.filename);
598 map = machine__new_module(machine, event->mmap.start,
599 event->mmap.filename);
603 name = strdup(short_module_name);
607 map->dso->short_name = name;
608 map->dso->sname_alloc = 1;
609 map->end = map->start + event->mmap.len;
610 } else if (is_kernel_mmap) {
611 const char *symbol_name = (event->mmap.filename +
612 strlen(kmmap_prefix));
614 * Should be there already, from the build-id table in
617 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
622 kernel->kernel = kernel_type;
623 if (__machine__create_kernel_maps(machine, kernel) < 0)
626 perf_event__set_kernel_mmap_len(event, machine->vmlinux_maps);
629 * Avoid using a zero address (kptr_restrict) for the ref reloc
630 * symbol. Effectively having zero here means that at record
631 * time /proc/sys/kernel/kptr_restrict was non zero.
633 if (event->mmap.pgoff != 0) {
634 maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
639 if (machine__is_default_guest(machine)) {
641 * preload dso of guest kernel and modules
643 dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
652 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
654 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %s\n",
655 event->mmap.pid, event->mmap.tid, event->mmap.start,
656 event->mmap.len, event->mmap.pgoff, event->mmap.filename);
659 int perf_event__process_mmap(struct perf_tool *tool,
660 union perf_event *event,
661 struct perf_sample *sample __maybe_unused,
662 struct machine *machine)
664 struct thread *thread;
666 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
670 perf_event__fprintf_mmap(event, stdout);
672 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
673 cpumode == PERF_RECORD_MISC_KERNEL) {
674 ret = perf_event__process_kernel_mmap(tool, event, machine);
680 thread = machine__findnew_thread(machine, event->mmap.pid);
683 map = map__new(&machine->user_dsos, event->mmap.start,
684 event->mmap.len, event->mmap.pgoff,
685 event->mmap.pid, event->mmap.filename,
690 thread__insert_map(thread, map);
694 dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
698 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
700 return fprintf(fp, "(%d:%d):(%d:%d)\n",
701 event->fork.pid, event->fork.tid,
702 event->fork.ppid, event->fork.ptid);
705 int perf_event__process_task(struct perf_tool *tool __maybe_unused,
706 union perf_event *event,
707 struct perf_sample *sample __maybe_unused,
708 struct machine *machine)
710 struct thread *thread = machine__findnew_thread(machine, event->fork.tid);
711 struct thread *parent = machine__findnew_thread(machine, event->fork.ptid);
714 perf_event__fprintf_task(event, stdout);
716 if (event->header.type == PERF_RECORD_EXIT) {
717 machine__remove_thread(machine, thread);
721 if (thread == NULL || parent == NULL ||
722 thread__fork(thread, parent) < 0) {
723 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
730 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
732 size_t ret = fprintf(fp, "PERF_RECORD_%s",
733 perf_event__name(event->header.type));
735 switch (event->header.type) {
736 case PERF_RECORD_COMM:
737 ret += perf_event__fprintf_comm(event, fp);
739 case PERF_RECORD_FORK:
740 case PERF_RECORD_EXIT:
741 ret += perf_event__fprintf_task(event, fp);
743 case PERF_RECORD_MMAP:
744 ret += perf_event__fprintf_mmap(event, fp);
747 ret += fprintf(fp, "\n");
753 int perf_event__process(struct perf_tool *tool, union perf_event *event,
754 struct perf_sample *sample, struct machine *machine)
756 switch (event->header.type) {
757 case PERF_RECORD_COMM:
758 perf_event__process_comm(tool, event, sample, machine);
760 case PERF_RECORD_MMAP:
761 perf_event__process_mmap(tool, event, sample, machine);
763 case PERF_RECORD_FORK:
764 case PERF_RECORD_EXIT:
765 perf_event__process_task(tool, event, sample, machine);
767 case PERF_RECORD_LOST:
768 perf_event__process_lost(tool, event, sample, machine);
776 void thread__find_addr_map(struct thread *self,
777 struct machine *machine, u8 cpumode,
778 enum map_type type, u64 addr,
779 struct addr_location *al)
781 struct map_groups *mg = &self->mg;
785 al->cpumode = cpumode;
786 al->filtered = false;
788 if (machine == NULL) {
793 if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
795 mg = &machine->kmaps;
796 } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
798 } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
800 mg = &machine->kmaps;
803 * 'u' means guest os user space.
804 * TODO: We don't support guest user space. Might support late.
806 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
812 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
813 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
816 if ((cpumode == PERF_RECORD_MISC_USER ||
817 cpumode == PERF_RECORD_MISC_KERNEL) &&
824 al->map = map_groups__find(mg, type, al->addr);
825 if (al->map == NULL) {
827 * If this is outside of all known maps, and is a negative
828 * address, try to look it up in the kernel dso, as it might be
829 * a vsyscall or vdso (which executes in user-mode).
831 * XXX This is nasty, we should have a symbol list in the
832 * "[vdso]" dso, but for now lets use the old trick of looking
833 * in the whole kernel symbol list.
835 if ((long long)al->addr < 0 &&
836 cpumode == PERF_RECORD_MISC_USER &&
837 machine && mg != &machine->kmaps) {
838 mg = &machine->kmaps;
842 al->addr = al->map->map_ip(al->map, al->addr);
845 void thread__find_addr_location(struct thread *thread, struct machine *machine,
846 u8 cpumode, enum map_type type, u64 addr,
847 struct addr_location *al,
848 symbol_filter_t filter)
850 thread__find_addr_map(thread, machine, cpumode, type, addr, al);
852 al->sym = map__find_symbol(al->map, al->addr, filter);
857 int perf_event__preprocess_sample(const union perf_event *event,
858 struct machine *machine,
859 struct addr_location *al,
860 struct perf_sample *sample,
861 symbol_filter_t filter)
863 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
864 struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
869 if (symbol_conf.comm_list &&
870 !strlist__has_entry(symbol_conf.comm_list, thread->comm))
873 dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
875 * Have we already created the kernel maps for this machine?
877 * This should have happened earlier, when we processed the kernel MMAP
878 * events, but for older perf.data files there was no such thing, so do
881 if (cpumode == PERF_RECORD_MISC_KERNEL &&
882 machine->vmlinux_maps[MAP__FUNCTION] == NULL)
883 machine__create_kernel_maps(machine);
885 thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
887 dump_printf(" ...... dso: %s\n",
888 al->map ? al->map->dso->long_name :
889 al->level == 'H' ? "[hypervisor]" : "<not found>");
891 al->cpu = sample->cpu;
894 struct dso *dso = al->map->dso;
896 if (symbol_conf.dso_list &&
897 (!dso || !(strlist__has_entry(symbol_conf.dso_list,
899 (dso->short_name != dso->long_name &&
900 strlist__has_entry(symbol_conf.dso_list,
904 al->sym = map__find_symbol(al->map, al->addr, filter);
907 if (symbol_conf.sym_list &&
908 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,