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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[deliverable/linux.git] / tools / perf / util / event.c
1 #include <linux/types.h>
2 #include <sys/mman.h>
3 #include "event.h"
4 #include "debug.h"
5 #include "hist.h"
6 #include "machine.h"
7 #include "sort.h"
8 #include "string.h"
9 #include "strlist.h"
10 #include "thread.h"
11 #include "thread_map.h"
12 #include "symbol/kallsyms.h"
13 #include "asm/bug.h"
14 #include "stat.h"
15
16 static const char *perf_event__names[] = {
17 [0] = "TOTAL",
18 [PERF_RECORD_MMAP] = "MMAP",
19 [PERF_RECORD_MMAP2] = "MMAP2",
20 [PERF_RECORD_LOST] = "LOST",
21 [PERF_RECORD_COMM] = "COMM",
22 [PERF_RECORD_EXIT] = "EXIT",
23 [PERF_RECORD_THROTTLE] = "THROTTLE",
24 [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
25 [PERF_RECORD_FORK] = "FORK",
26 [PERF_RECORD_READ] = "READ",
27 [PERF_RECORD_SAMPLE] = "SAMPLE",
28 [PERF_RECORD_AUX] = "AUX",
29 [PERF_RECORD_ITRACE_START] = "ITRACE_START",
30 [PERF_RECORD_LOST_SAMPLES] = "LOST_SAMPLES",
31 [PERF_RECORD_SWITCH] = "SWITCH",
32 [PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
33 [PERF_RECORD_HEADER_ATTR] = "ATTR",
34 [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
35 [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
36 [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
37 [PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
38 [PERF_RECORD_ID_INDEX] = "ID_INDEX",
39 [PERF_RECORD_AUXTRACE_INFO] = "AUXTRACE_INFO",
40 [PERF_RECORD_AUXTRACE] = "AUXTRACE",
41 [PERF_RECORD_AUXTRACE_ERROR] = "AUXTRACE_ERROR",
42 [PERF_RECORD_THREAD_MAP] = "THREAD_MAP",
43 [PERF_RECORD_CPU_MAP] = "CPU_MAP",
44 [PERF_RECORD_STAT_CONFIG] = "STAT_CONFIG",
45 [PERF_RECORD_STAT] = "STAT",
46 [PERF_RECORD_STAT_ROUND] = "STAT_ROUND",
47 [PERF_RECORD_EVENT_UPDATE] = "EVENT_UPDATE",
48 [PERF_RECORD_TIME_CONV] = "TIME_CONV",
49 };
50
51 const char *perf_event__name(unsigned int id)
52 {
53 if (id >= ARRAY_SIZE(perf_event__names))
54 return "INVALID";
55 if (!perf_event__names[id])
56 return "UNKNOWN";
57 return perf_event__names[id];
58 }
59
60 static int perf_tool__process_synth_event(struct perf_tool *tool,
61 union perf_event *event,
62 struct machine *machine,
63 perf_event__handler_t process)
64 {
65 struct perf_sample synth_sample = {
66 .pid = -1,
67 .tid = -1,
68 .time = -1,
69 .stream_id = -1,
70 .cpu = -1,
71 .period = 1,
72 .cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
73 };
74
75 return process(tool, event, &synth_sample, machine);
76 };
77
78 /*
79 * Assumes that the first 4095 bytes of /proc/pid/stat contains
80 * the comm, tgid and ppid.
81 */
82 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
83 pid_t *tgid, pid_t *ppid)
84 {
85 char filename[PATH_MAX];
86 char bf[4096];
87 int fd;
88 size_t size = 0;
89 ssize_t n;
90 char *nl, *name, *tgids, *ppids;
91
92 *tgid = -1;
93 *ppid = -1;
94
95 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
96
97 fd = open(filename, O_RDONLY);
98 if (fd < 0) {
99 pr_debug("couldn't open %s\n", filename);
100 return -1;
101 }
102
103 n = read(fd, bf, sizeof(bf) - 1);
104 close(fd);
105 if (n <= 0) {
106 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
107 pid);
108 return -1;
109 }
110 bf[n] = '\0';
111
112 name = strstr(bf, "Name:");
113 tgids = strstr(bf, "Tgid:");
114 ppids = strstr(bf, "PPid:");
115
116 if (name) {
117 name += 5; /* strlen("Name:") */
118
119 while (*name && isspace(*name))
120 ++name;
121
122 nl = strchr(name, '\n');
123 if (nl)
124 *nl = '\0';
125
126 size = strlen(name);
127 if (size >= len)
128 size = len - 1;
129 memcpy(comm, name, size);
130 comm[size] = '\0';
131 } else {
132 pr_debug("Name: string not found for pid %d\n", pid);
133 }
134
135 if (tgids) {
136 tgids += 5; /* strlen("Tgid:") */
137 *tgid = atoi(tgids);
138 } else {
139 pr_debug("Tgid: string not found for pid %d\n", pid);
140 }
141
142 if (ppids) {
143 ppids += 5; /* strlen("PPid:") */
144 *ppid = atoi(ppids);
145 } else {
146 pr_debug("PPid: string not found for pid %d\n", pid);
147 }
148
149 return 0;
150 }
151
152 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
153 struct machine *machine,
154 pid_t *tgid, pid_t *ppid)
155 {
156 size_t size;
157
158 *ppid = -1;
159
160 memset(&event->comm, 0, sizeof(event->comm));
161
162 if (machine__is_host(machine)) {
163 if (perf_event__get_comm_ids(pid, event->comm.comm,
164 sizeof(event->comm.comm),
165 tgid, ppid) != 0) {
166 return -1;
167 }
168 } else {
169 *tgid = machine->pid;
170 }
171
172 if (*tgid < 0)
173 return -1;
174
175 event->comm.pid = *tgid;
176 event->comm.header.type = PERF_RECORD_COMM;
177
178 size = strlen(event->comm.comm) + 1;
179 size = PERF_ALIGN(size, sizeof(u64));
180 memset(event->comm.comm + size, 0, machine->id_hdr_size);
181 event->comm.header.size = (sizeof(event->comm) -
182 (sizeof(event->comm.comm) - size) +
183 machine->id_hdr_size);
184 event->comm.tid = pid;
185
186 return 0;
187 }
188
189 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
190 union perf_event *event, pid_t pid,
191 perf_event__handler_t process,
192 struct machine *machine)
193 {
194 pid_t tgid, ppid;
195
196 if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
197 return -1;
198
199 if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
200 return -1;
201
202 return tgid;
203 }
204
205 static int perf_event__synthesize_fork(struct perf_tool *tool,
206 union perf_event *event,
207 pid_t pid, pid_t tgid, pid_t ppid,
208 perf_event__handler_t process,
209 struct machine *machine)
210 {
211 memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
212
213 /*
214 * for main thread set parent to ppid from status file. For other
215 * threads set parent pid to main thread. ie., assume main thread
216 * spawns all threads in a process
217 */
218 if (tgid == pid) {
219 event->fork.ppid = ppid;
220 event->fork.ptid = ppid;
221 } else {
222 event->fork.ppid = tgid;
223 event->fork.ptid = tgid;
224 }
225 event->fork.pid = tgid;
226 event->fork.tid = pid;
227 event->fork.header.type = PERF_RECORD_FORK;
228
229 event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
230
231 if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
232 return -1;
233
234 return 0;
235 }
236
237 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
238 union perf_event *event,
239 pid_t pid, pid_t tgid,
240 perf_event__handler_t process,
241 struct machine *machine,
242 bool mmap_data,
243 unsigned int proc_map_timeout)
244 {
245 char filename[PATH_MAX];
246 FILE *fp;
247 unsigned long long t;
248 bool truncation = false;
249 unsigned long long timeout = proc_map_timeout * 1000000ULL;
250 int rc = 0;
251
252 if (machine__is_default_guest(machine))
253 return 0;
254
255 snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
256 machine->root_dir, pid);
257
258 fp = fopen(filename, "r");
259 if (fp == NULL) {
260 /*
261 * We raced with a task exiting - just return:
262 */
263 pr_debug("couldn't open %s\n", filename);
264 return -1;
265 }
266
267 event->header.type = PERF_RECORD_MMAP2;
268 t = rdclock();
269
270 while (1) {
271 char bf[BUFSIZ];
272 char prot[5];
273 char execname[PATH_MAX];
274 char anonstr[] = "//anon";
275 unsigned int ino;
276 size_t size;
277 ssize_t n;
278
279 if (fgets(bf, sizeof(bf), fp) == NULL)
280 break;
281
282 if ((rdclock() - t) > timeout) {
283 pr_warning("Reading %s time out. "
284 "You may want to increase "
285 "the time limit by --proc-map-timeout\n",
286 filename);
287 truncation = true;
288 goto out;
289 }
290
291 /* ensure null termination since stack will be reused. */
292 strcpy(execname, "");
293
294 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
295 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %[^\n]\n",
296 &event->mmap2.start, &event->mmap2.len, prot,
297 &event->mmap2.pgoff, &event->mmap2.maj,
298 &event->mmap2.min,
299 &ino, execname);
300
301 /*
302 * Anon maps don't have the execname.
303 */
304 if (n < 7)
305 continue;
306
307 event->mmap2.ino = (u64)ino;
308
309 /*
310 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
311 */
312 if (machine__is_host(machine))
313 event->header.misc = PERF_RECORD_MISC_USER;
314 else
315 event->header.misc = PERF_RECORD_MISC_GUEST_USER;
316
317 /* map protection and flags bits */
318 event->mmap2.prot = 0;
319 event->mmap2.flags = 0;
320 if (prot[0] == 'r')
321 event->mmap2.prot |= PROT_READ;
322 if (prot[1] == 'w')
323 event->mmap2.prot |= PROT_WRITE;
324 if (prot[2] == 'x')
325 event->mmap2.prot |= PROT_EXEC;
326
327 if (prot[3] == 's')
328 event->mmap2.flags |= MAP_SHARED;
329 else
330 event->mmap2.flags |= MAP_PRIVATE;
331
332 if (prot[2] != 'x') {
333 if (!mmap_data || prot[0] != 'r')
334 continue;
335
336 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
337 }
338
339 out:
340 if (truncation)
341 event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
342
343 if (!strcmp(execname, ""))
344 strcpy(execname, anonstr);
345
346 size = strlen(execname) + 1;
347 memcpy(event->mmap2.filename, execname, size);
348 size = PERF_ALIGN(size, sizeof(u64));
349 event->mmap2.len -= event->mmap.start;
350 event->mmap2.header.size = (sizeof(event->mmap2) -
351 (sizeof(event->mmap2.filename) - size));
352 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
353 event->mmap2.header.size += machine->id_hdr_size;
354 event->mmap2.pid = tgid;
355 event->mmap2.tid = pid;
356
357 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
358 rc = -1;
359 break;
360 }
361
362 if (truncation)
363 break;
364 }
365
366 fclose(fp);
367 return rc;
368 }
369
370 int perf_event__synthesize_modules(struct perf_tool *tool,
371 perf_event__handler_t process,
372 struct machine *machine)
373 {
374 int rc = 0;
375 struct map *pos;
376 struct map_groups *kmaps = &machine->kmaps;
377 struct maps *maps = &kmaps->maps[MAP__FUNCTION];
378 union perf_event *event = zalloc((sizeof(event->mmap) +
379 machine->id_hdr_size));
380 if (event == NULL) {
381 pr_debug("Not enough memory synthesizing mmap event "
382 "for kernel modules\n");
383 return -1;
384 }
385
386 event->header.type = PERF_RECORD_MMAP;
387
388 /*
389 * kernel uses 0 for user space maps, see kernel/perf_event.c
390 * __perf_event_mmap
391 */
392 if (machine__is_host(machine))
393 event->header.misc = PERF_RECORD_MISC_KERNEL;
394 else
395 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
396
397 for (pos = maps__first(maps); pos; pos = map__next(pos)) {
398 size_t size;
399
400 if (__map__is_kernel(pos))
401 continue;
402
403 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
404 event->mmap.header.type = PERF_RECORD_MMAP;
405 event->mmap.header.size = (sizeof(event->mmap) -
406 (sizeof(event->mmap.filename) - size));
407 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
408 event->mmap.header.size += machine->id_hdr_size;
409 event->mmap.start = pos->start;
410 event->mmap.len = pos->end - pos->start;
411 event->mmap.pid = machine->pid;
412
413 memcpy(event->mmap.filename, pos->dso->long_name,
414 pos->dso->long_name_len + 1);
415 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
416 rc = -1;
417 break;
418 }
419 }
420
421 free(event);
422 return rc;
423 }
424
425 static int __event__synthesize_thread(union perf_event *comm_event,
426 union perf_event *mmap_event,
427 union perf_event *fork_event,
428 pid_t pid, int full,
429 perf_event__handler_t process,
430 struct perf_tool *tool,
431 struct machine *machine,
432 bool mmap_data,
433 unsigned int proc_map_timeout)
434 {
435 char filename[PATH_MAX];
436 DIR *tasks;
437 struct dirent *dirent;
438 pid_t tgid, ppid;
439 int rc = 0;
440
441 /* special case: only send one comm event using passed in pid */
442 if (!full) {
443 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
444 process, machine);
445
446 if (tgid == -1)
447 return -1;
448
449 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
450 process, machine, mmap_data,
451 proc_map_timeout);
452 }
453
454 if (machine__is_default_guest(machine))
455 return 0;
456
457 snprintf(filename, sizeof(filename), "%s/proc/%d/task",
458 machine->root_dir, pid);
459
460 tasks = opendir(filename);
461 if (tasks == NULL) {
462 pr_debug("couldn't open %s\n", filename);
463 return 0;
464 }
465
466 while ((dirent = readdir(tasks)) != NULL) {
467 char *end;
468 pid_t _pid;
469
470 _pid = strtol(dirent->d_name, &end, 10);
471 if (*end)
472 continue;
473
474 rc = -1;
475 if (perf_event__prepare_comm(comm_event, _pid, machine,
476 &tgid, &ppid) != 0)
477 break;
478
479 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
480 ppid, process, machine) < 0)
481 break;
482 /*
483 * Send the prepared comm event
484 */
485 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
486 break;
487
488 rc = 0;
489 if (_pid == pid) {
490 /* process the parent's maps too */
491 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
492 process, machine, mmap_data, proc_map_timeout);
493 if (rc)
494 break;
495 }
496 }
497
498 closedir(tasks);
499 return rc;
500 }
501
502 int perf_event__synthesize_thread_map(struct perf_tool *tool,
503 struct thread_map *threads,
504 perf_event__handler_t process,
505 struct machine *machine,
506 bool mmap_data,
507 unsigned int proc_map_timeout)
508 {
509 union perf_event *comm_event, *mmap_event, *fork_event;
510 int err = -1, thread, j;
511
512 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
513 if (comm_event == NULL)
514 goto out;
515
516 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
517 if (mmap_event == NULL)
518 goto out_free_comm;
519
520 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
521 if (fork_event == NULL)
522 goto out_free_mmap;
523
524 err = 0;
525 for (thread = 0; thread < threads->nr; ++thread) {
526 if (__event__synthesize_thread(comm_event, mmap_event,
527 fork_event,
528 thread_map__pid(threads, thread), 0,
529 process, tool, machine,
530 mmap_data, proc_map_timeout)) {
531 err = -1;
532 break;
533 }
534
535 /*
536 * comm.pid is set to thread group id by
537 * perf_event__synthesize_comm
538 */
539 if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
540 bool need_leader = true;
541
542 /* is thread group leader in thread_map? */
543 for (j = 0; j < threads->nr; ++j) {
544 if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
545 need_leader = false;
546 break;
547 }
548 }
549
550 /* if not, generate events for it */
551 if (need_leader &&
552 __event__synthesize_thread(comm_event, mmap_event,
553 fork_event,
554 comm_event->comm.pid, 0,
555 process, tool, machine,
556 mmap_data, proc_map_timeout)) {
557 err = -1;
558 break;
559 }
560 }
561 }
562 free(fork_event);
563 out_free_mmap:
564 free(mmap_event);
565 out_free_comm:
566 free(comm_event);
567 out:
568 return err;
569 }
570
571 int perf_event__synthesize_threads(struct perf_tool *tool,
572 perf_event__handler_t process,
573 struct machine *machine,
574 bool mmap_data,
575 unsigned int proc_map_timeout)
576 {
577 DIR *proc;
578 char proc_path[PATH_MAX];
579 struct dirent *dirent;
580 union perf_event *comm_event, *mmap_event, *fork_event;
581 int err = -1;
582
583 if (machine__is_default_guest(machine))
584 return 0;
585
586 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
587 if (comm_event == NULL)
588 goto out;
589
590 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
591 if (mmap_event == NULL)
592 goto out_free_comm;
593
594 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
595 if (fork_event == NULL)
596 goto out_free_mmap;
597
598 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
599 proc = opendir(proc_path);
600
601 if (proc == NULL)
602 goto out_free_fork;
603
604 while ((dirent = readdir(proc)) != NULL) {
605 char *end;
606 pid_t pid = strtol(dirent->d_name, &end, 10);
607
608 if (*end) /* only interested in proper numerical dirents */
609 continue;
610 /*
611 * We may race with exiting thread, so don't stop just because
612 * one thread couldn't be synthesized.
613 */
614 __event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
615 1, process, tool, machine, mmap_data,
616 proc_map_timeout);
617 }
618
619 err = 0;
620 closedir(proc);
621 out_free_fork:
622 free(fork_event);
623 out_free_mmap:
624 free(mmap_event);
625 out_free_comm:
626 free(comm_event);
627 out:
628 return err;
629 }
630
631 struct process_symbol_args {
632 const char *name;
633 u64 start;
634 };
635
636 static int find_symbol_cb(void *arg, const char *name, char type,
637 u64 start)
638 {
639 struct process_symbol_args *args = arg;
640
641 /*
642 * Must be a function or at least an alias, as in PARISC64, where "_text" is
643 * an 'A' to the same address as "_stext".
644 */
645 if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
646 type == 'A') || strcmp(name, args->name))
647 return 0;
648
649 args->start = start;
650 return 1;
651 }
652
653 u64 kallsyms__get_function_start(const char *kallsyms_filename,
654 const char *symbol_name)
655 {
656 struct process_symbol_args args = { .name = symbol_name, };
657
658 if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
659 return 0;
660
661 return args.start;
662 }
663
664 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
665 perf_event__handler_t process,
666 struct machine *machine)
667 {
668 size_t size;
669 const char *mmap_name;
670 char name_buff[PATH_MAX];
671 struct map *map = machine__kernel_map(machine);
672 struct kmap *kmap;
673 int err;
674 union perf_event *event;
675
676 if (symbol_conf.kptr_restrict)
677 return -1;
678 if (map == NULL)
679 return -1;
680
681 /*
682 * We should get this from /sys/kernel/sections/.text, but till that is
683 * available use this, and after it is use this as a fallback for older
684 * kernels.
685 */
686 event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
687 if (event == NULL) {
688 pr_debug("Not enough memory synthesizing mmap event "
689 "for kernel modules\n");
690 return -1;
691 }
692
693 mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
694 if (machine__is_host(machine)) {
695 /*
696 * kernel uses PERF_RECORD_MISC_USER for user space maps,
697 * see kernel/perf_event.c __perf_event_mmap
698 */
699 event->header.misc = PERF_RECORD_MISC_KERNEL;
700 } else {
701 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
702 }
703
704 kmap = map__kmap(map);
705 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
706 "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
707 size = PERF_ALIGN(size, sizeof(u64));
708 event->mmap.header.type = PERF_RECORD_MMAP;
709 event->mmap.header.size = (sizeof(event->mmap) -
710 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
711 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
712 event->mmap.start = map->start;
713 event->mmap.len = map->end - event->mmap.start;
714 event->mmap.pid = machine->pid;
715
716 err = perf_tool__process_synth_event(tool, event, machine, process);
717 free(event);
718
719 return err;
720 }
721
722 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
723 struct thread_map *threads,
724 perf_event__handler_t process,
725 struct machine *machine)
726 {
727 union perf_event *event;
728 int i, err, size;
729
730 size = sizeof(event->thread_map);
731 size += threads->nr * sizeof(event->thread_map.entries[0]);
732
733 event = zalloc(size);
734 if (!event)
735 return -ENOMEM;
736
737 event->header.type = PERF_RECORD_THREAD_MAP;
738 event->header.size = size;
739 event->thread_map.nr = threads->nr;
740
741 for (i = 0; i < threads->nr; i++) {
742 struct thread_map_event_entry *entry = &event->thread_map.entries[i];
743 char *comm = thread_map__comm(threads, i);
744
745 if (!comm)
746 comm = (char *) "";
747
748 entry->pid = thread_map__pid(threads, i);
749 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
750 }
751
752 err = process(tool, event, NULL, machine);
753
754 free(event);
755 return err;
756 }
757
758 static void synthesize_cpus(struct cpu_map_entries *cpus,
759 struct cpu_map *map)
760 {
761 int i;
762
763 cpus->nr = map->nr;
764
765 for (i = 0; i < map->nr; i++)
766 cpus->cpu[i] = map->map[i];
767 }
768
769 static void synthesize_mask(struct cpu_map_mask *mask,
770 struct cpu_map *map, int max)
771 {
772 int i;
773
774 mask->nr = BITS_TO_LONGS(max);
775 mask->long_size = sizeof(long);
776
777 for (i = 0; i < map->nr; i++)
778 set_bit(map->map[i], mask->mask);
779 }
780
781 static size_t cpus_size(struct cpu_map *map)
782 {
783 return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
784 }
785
786 static size_t mask_size(struct cpu_map *map, int *max)
787 {
788 int i;
789
790 *max = 0;
791
792 for (i = 0; i < map->nr; i++) {
793 /* bit possition of the cpu is + 1 */
794 int bit = map->map[i] + 1;
795
796 if (bit > *max)
797 *max = bit;
798 }
799
800 return sizeof(struct cpu_map_mask) + BITS_TO_LONGS(*max) * sizeof(long);
801 }
802
803 void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max)
804 {
805 size_t size_cpus, size_mask;
806 bool is_dummy = cpu_map__empty(map);
807
808 /*
809 * Both array and mask data have variable size based
810 * on the number of cpus and their actual values.
811 * The size of the 'struct cpu_map_data' is:
812 *
813 * array = size of 'struct cpu_map_entries' +
814 * number of cpus * sizeof(u64)
815 *
816 * mask = size of 'struct cpu_map_mask' +
817 * maximum cpu bit converted to size of longs
818 *
819 * and finaly + the size of 'struct cpu_map_data'.
820 */
821 size_cpus = cpus_size(map);
822 size_mask = mask_size(map, max);
823
824 if (is_dummy || (size_cpus < size_mask)) {
825 *size += size_cpus;
826 *type = PERF_CPU_MAP__CPUS;
827 } else {
828 *size += size_mask;
829 *type = PERF_CPU_MAP__MASK;
830 }
831
832 *size += sizeof(struct cpu_map_data);
833 return zalloc(*size);
834 }
835
836 void cpu_map_data__synthesize(struct cpu_map_data *data, struct cpu_map *map,
837 u16 type, int max)
838 {
839 data->type = type;
840
841 switch (type) {
842 case PERF_CPU_MAP__CPUS:
843 synthesize_cpus((struct cpu_map_entries *) data->data, map);
844 break;
845 case PERF_CPU_MAP__MASK:
846 synthesize_mask((struct cpu_map_mask *) data->data, map, max);
847 default:
848 break;
849 };
850 }
851
852 static struct cpu_map_event* cpu_map_event__new(struct cpu_map *map)
853 {
854 size_t size = sizeof(struct cpu_map_event);
855 struct cpu_map_event *event;
856 int max;
857 u16 type;
858
859 event = cpu_map_data__alloc(map, &size, &type, &max);
860 if (!event)
861 return NULL;
862
863 event->header.type = PERF_RECORD_CPU_MAP;
864 event->header.size = size;
865 event->data.type = type;
866
867 cpu_map_data__synthesize(&event->data, map, type, max);
868 return event;
869 }
870
871 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
872 struct cpu_map *map,
873 perf_event__handler_t process,
874 struct machine *machine)
875 {
876 struct cpu_map_event *event;
877 int err;
878
879 event = cpu_map_event__new(map);
880 if (!event)
881 return -ENOMEM;
882
883 err = process(tool, (union perf_event *) event, NULL, machine);
884
885 free(event);
886 return err;
887 }
888
889 int perf_event__synthesize_stat_config(struct perf_tool *tool,
890 struct perf_stat_config *config,
891 perf_event__handler_t process,
892 struct machine *machine)
893 {
894 struct stat_config_event *event;
895 int size, i = 0, err;
896
897 size = sizeof(*event);
898 size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
899
900 event = zalloc(size);
901 if (!event)
902 return -ENOMEM;
903
904 event->header.type = PERF_RECORD_STAT_CONFIG;
905 event->header.size = size;
906 event->nr = PERF_STAT_CONFIG_TERM__MAX;
907
908 #define ADD(__term, __val) \
909 event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \
910 event->data[i].val = __val; \
911 i++;
912
913 ADD(AGGR_MODE, config->aggr_mode)
914 ADD(INTERVAL, config->interval)
915 ADD(SCALE, config->scale)
916
917 WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
918 "stat config terms unbalanced\n");
919 #undef ADD
920
921 err = process(tool, (union perf_event *) event, NULL, machine);
922
923 free(event);
924 return err;
925 }
926
927 int perf_event__synthesize_stat(struct perf_tool *tool,
928 u32 cpu, u32 thread, u64 id,
929 struct perf_counts_values *count,
930 perf_event__handler_t process,
931 struct machine *machine)
932 {
933 struct stat_event event;
934
935 event.header.type = PERF_RECORD_STAT;
936 event.header.size = sizeof(event);
937 event.header.misc = 0;
938
939 event.id = id;
940 event.cpu = cpu;
941 event.thread = thread;
942 event.val = count->val;
943 event.ena = count->ena;
944 event.run = count->run;
945
946 return process(tool, (union perf_event *) &event, NULL, machine);
947 }
948
949 int perf_event__synthesize_stat_round(struct perf_tool *tool,
950 u64 evtime, u64 type,
951 perf_event__handler_t process,
952 struct machine *machine)
953 {
954 struct stat_round_event event;
955
956 event.header.type = PERF_RECORD_STAT_ROUND;
957 event.header.size = sizeof(event);
958 event.header.misc = 0;
959
960 event.time = evtime;
961 event.type = type;
962
963 return process(tool, (union perf_event *) &event, NULL, machine);
964 }
965
966 void perf_event__read_stat_config(struct perf_stat_config *config,
967 struct stat_config_event *event)
968 {
969 unsigned i;
970
971 for (i = 0; i < event->nr; i++) {
972
973 switch (event->data[i].tag) {
974 #define CASE(__term, __val) \
975 case PERF_STAT_CONFIG_TERM__##__term: \
976 config->__val = event->data[i].val; \
977 break;
978
979 CASE(AGGR_MODE, aggr_mode)
980 CASE(SCALE, scale)
981 CASE(INTERVAL, interval)
982 #undef CASE
983 default:
984 pr_warning("unknown stat config term %" PRIu64 "\n",
985 event->data[i].tag);
986 }
987 }
988 }
989
990 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
991 {
992 const char *s;
993
994 if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
995 s = " exec";
996 else
997 s = "";
998
999 return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
1000 }
1001
1002 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
1003 union perf_event *event,
1004 struct perf_sample *sample,
1005 struct machine *machine)
1006 {
1007 return machine__process_comm_event(machine, event, sample);
1008 }
1009
1010 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
1011 union perf_event *event,
1012 struct perf_sample *sample,
1013 struct machine *machine)
1014 {
1015 return machine__process_lost_event(machine, event, sample);
1016 }
1017
1018 int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
1019 union perf_event *event,
1020 struct perf_sample *sample __maybe_unused,
1021 struct machine *machine)
1022 {
1023 return machine__process_aux_event(machine, event);
1024 }
1025
1026 int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
1027 union perf_event *event,
1028 struct perf_sample *sample __maybe_unused,
1029 struct machine *machine)
1030 {
1031 return machine__process_itrace_start_event(machine, event);
1032 }
1033
1034 int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
1035 union perf_event *event,
1036 struct perf_sample *sample,
1037 struct machine *machine)
1038 {
1039 return machine__process_lost_samples_event(machine, event, sample);
1040 }
1041
1042 int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
1043 union perf_event *event,
1044 struct perf_sample *sample __maybe_unused,
1045 struct machine *machine)
1046 {
1047 return machine__process_switch_event(machine, event);
1048 }
1049
1050 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
1051 {
1052 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
1053 event->mmap.pid, event->mmap.tid, event->mmap.start,
1054 event->mmap.len, event->mmap.pgoff,
1055 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
1056 event->mmap.filename);
1057 }
1058
1059 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
1060 {
1061 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
1062 " %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
1063 event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
1064 event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
1065 event->mmap2.min, event->mmap2.ino,
1066 event->mmap2.ino_generation,
1067 (event->mmap2.prot & PROT_READ) ? 'r' : '-',
1068 (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
1069 (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
1070 (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
1071 event->mmap2.filename);
1072 }
1073
1074 size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp)
1075 {
1076 struct thread_map *threads = thread_map__new_event(&event->thread_map);
1077 size_t ret;
1078
1079 ret = fprintf(fp, " nr: ");
1080
1081 if (threads)
1082 ret += thread_map__fprintf(threads, fp);
1083 else
1084 ret += fprintf(fp, "failed to get threads from event\n");
1085
1086 thread_map__put(threads);
1087 return ret;
1088 }
1089
1090 size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp)
1091 {
1092 struct cpu_map *cpus = cpu_map__new_data(&event->cpu_map.data);
1093 size_t ret;
1094
1095 ret = fprintf(fp, " nr: ");
1096
1097 if (cpus)
1098 ret += cpu_map__fprintf(cpus, fp);
1099 else
1100 ret += fprintf(fp, "failed to get cpumap from event\n");
1101
1102 cpu_map__put(cpus);
1103 return ret;
1104 }
1105
1106 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
1107 union perf_event *event,
1108 struct perf_sample *sample,
1109 struct machine *machine)
1110 {
1111 return machine__process_mmap_event(machine, event, sample);
1112 }
1113
1114 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
1115 union perf_event *event,
1116 struct perf_sample *sample,
1117 struct machine *machine)
1118 {
1119 return machine__process_mmap2_event(machine, event, sample);
1120 }
1121
1122 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
1123 {
1124 return fprintf(fp, "(%d:%d):(%d:%d)\n",
1125 event->fork.pid, event->fork.tid,
1126 event->fork.ppid, event->fork.ptid);
1127 }
1128
1129 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
1130 union perf_event *event,
1131 struct perf_sample *sample,
1132 struct machine *machine)
1133 {
1134 return machine__process_fork_event(machine, event, sample);
1135 }
1136
1137 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
1138 union perf_event *event,
1139 struct perf_sample *sample,
1140 struct machine *machine)
1141 {
1142 return machine__process_exit_event(machine, event, sample);
1143 }
1144
1145 size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
1146 {
1147 return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s]\n",
1148 event->aux.aux_offset, event->aux.aux_size,
1149 event->aux.flags,
1150 event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
1151 event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "");
1152 }
1153
1154 size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
1155 {
1156 return fprintf(fp, " pid: %u tid: %u\n",
1157 event->itrace_start.pid, event->itrace_start.tid);
1158 }
1159
1160 size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
1161 {
1162 bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
1163 const char *in_out = out ? "OUT" : "IN ";
1164
1165 if (event->header.type == PERF_RECORD_SWITCH)
1166 return fprintf(fp, " %s\n", in_out);
1167
1168 return fprintf(fp, " %s %s pid/tid: %5u/%-5u\n",
1169 in_out, out ? "next" : "prev",
1170 event->context_switch.next_prev_pid,
1171 event->context_switch.next_prev_tid);
1172 }
1173
1174 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
1175 {
1176 size_t ret = fprintf(fp, "PERF_RECORD_%s",
1177 perf_event__name(event->header.type));
1178
1179 switch (event->header.type) {
1180 case PERF_RECORD_COMM:
1181 ret += perf_event__fprintf_comm(event, fp);
1182 break;
1183 case PERF_RECORD_FORK:
1184 case PERF_RECORD_EXIT:
1185 ret += perf_event__fprintf_task(event, fp);
1186 break;
1187 case PERF_RECORD_MMAP:
1188 ret += perf_event__fprintf_mmap(event, fp);
1189 break;
1190 case PERF_RECORD_MMAP2:
1191 ret += perf_event__fprintf_mmap2(event, fp);
1192 break;
1193 case PERF_RECORD_AUX:
1194 ret += perf_event__fprintf_aux(event, fp);
1195 break;
1196 case PERF_RECORD_ITRACE_START:
1197 ret += perf_event__fprintf_itrace_start(event, fp);
1198 break;
1199 case PERF_RECORD_SWITCH:
1200 case PERF_RECORD_SWITCH_CPU_WIDE:
1201 ret += perf_event__fprintf_switch(event, fp);
1202 break;
1203 default:
1204 ret += fprintf(fp, "\n");
1205 }
1206
1207 return ret;
1208 }
1209
1210 int perf_event__process(struct perf_tool *tool __maybe_unused,
1211 union perf_event *event,
1212 struct perf_sample *sample,
1213 struct machine *machine)
1214 {
1215 return machine__process_event(machine, event, sample);
1216 }
1217
1218 void thread__find_addr_map(struct thread *thread, u8 cpumode,
1219 enum map_type type, u64 addr,
1220 struct addr_location *al)
1221 {
1222 struct map_groups *mg = thread->mg;
1223 struct machine *machine = mg->machine;
1224 bool load_map = false;
1225
1226 al->machine = machine;
1227 al->thread = thread;
1228 al->addr = addr;
1229 al->cpumode = cpumode;
1230 al->filtered = 0;
1231
1232 if (machine == NULL) {
1233 al->map = NULL;
1234 return;
1235 }
1236
1237 if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
1238 al->level = 'k';
1239 mg = &machine->kmaps;
1240 load_map = true;
1241 } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
1242 al->level = '.';
1243 } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
1244 al->level = 'g';
1245 mg = &machine->kmaps;
1246 load_map = true;
1247 } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
1248 al->level = 'u';
1249 } else {
1250 al->level = 'H';
1251 al->map = NULL;
1252
1253 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
1254 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
1255 !perf_guest)
1256 al->filtered |= (1 << HIST_FILTER__GUEST);
1257 if ((cpumode == PERF_RECORD_MISC_USER ||
1258 cpumode == PERF_RECORD_MISC_KERNEL) &&
1259 !perf_host)
1260 al->filtered |= (1 << HIST_FILTER__HOST);
1261
1262 return;
1263 }
1264 try_again:
1265 al->map = map_groups__find(mg, type, al->addr);
1266 if (al->map == NULL) {
1267 /*
1268 * If this is outside of all known maps, and is a negative
1269 * address, try to look it up in the kernel dso, as it might be
1270 * a vsyscall or vdso (which executes in user-mode).
1271 *
1272 * XXX This is nasty, we should have a symbol list in the
1273 * "[vdso]" dso, but for now lets use the old trick of looking
1274 * in the whole kernel symbol list.
1275 */
1276 if (cpumode == PERF_RECORD_MISC_USER && machine &&
1277 mg != &machine->kmaps &&
1278 machine__kernel_ip(machine, al->addr)) {
1279 mg = &machine->kmaps;
1280 load_map = true;
1281 goto try_again;
1282 }
1283 } else {
1284 /*
1285 * Kernel maps might be changed when loading symbols so loading
1286 * must be done prior to using kernel maps.
1287 */
1288 if (load_map)
1289 map__load(al->map, machine->symbol_filter);
1290 al->addr = al->map->map_ip(al->map, al->addr);
1291 }
1292 }
1293
1294 void thread__find_addr_location(struct thread *thread,
1295 u8 cpumode, enum map_type type, u64 addr,
1296 struct addr_location *al)
1297 {
1298 thread__find_addr_map(thread, cpumode, type, addr, al);
1299 if (al->map != NULL)
1300 al->sym = map__find_symbol(al->map, al->addr,
1301 thread->mg->machine->symbol_filter);
1302 else
1303 al->sym = NULL;
1304 }
1305
1306 /*
1307 * Callers need to drop the reference to al->thread, obtained in
1308 * machine__findnew_thread()
1309 */
1310 int machine__resolve(struct machine *machine, struct addr_location *al,
1311 struct perf_sample *sample)
1312 {
1313 struct thread *thread = machine__findnew_thread(machine, sample->pid,
1314 sample->tid);
1315
1316 if (thread == NULL)
1317 return -1;
1318
1319 dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
1320 /*
1321 * Have we already created the kernel maps for this machine?
1322 *
1323 * This should have happened earlier, when we processed the kernel MMAP
1324 * events, but for older perf.data files there was no such thing, so do
1325 * it now.
1326 */
1327 if (sample->cpumode == PERF_RECORD_MISC_KERNEL &&
1328 machine__kernel_map(machine) == NULL)
1329 machine__create_kernel_maps(machine);
1330
1331 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, al);
1332 dump_printf(" ...... dso: %s\n",
1333 al->map ? al->map->dso->long_name :
1334 al->level == 'H' ? "[hypervisor]" : "<not found>");
1335
1336 if (thread__is_filtered(thread))
1337 al->filtered |= (1 << HIST_FILTER__THREAD);
1338
1339 al->sym = NULL;
1340 al->cpu = sample->cpu;
1341 al->socket = -1;
1342
1343 if (al->cpu >= 0) {
1344 struct perf_env *env = machine->env;
1345
1346 if (env && env->cpu)
1347 al->socket = env->cpu[al->cpu].socket_id;
1348 }
1349
1350 if (al->map) {
1351 struct dso *dso = al->map->dso;
1352
1353 if (symbol_conf.dso_list &&
1354 (!dso || !(strlist__has_entry(symbol_conf.dso_list,
1355 dso->short_name) ||
1356 (dso->short_name != dso->long_name &&
1357 strlist__has_entry(symbol_conf.dso_list,
1358 dso->long_name))))) {
1359 al->filtered |= (1 << HIST_FILTER__DSO);
1360 }
1361
1362 al->sym = map__find_symbol(al->map, al->addr,
1363 machine->symbol_filter);
1364 }
1365
1366 if (symbol_conf.sym_list &&
1367 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
1368 al->sym->name))) {
1369 al->filtered |= (1 << HIST_FILTER__SYMBOL);
1370 }
1371
1372 return 0;
1373 }
1374
1375 /*
1376 * The preprocess_sample method will return with reference counts for the
1377 * in it, when done using (and perhaps getting ref counts if needing to
1378 * keep a pointer to one of those entries) it must be paired with
1379 * addr_location__put(), so that the refcounts can be decremented.
1380 */
1381 void addr_location__put(struct addr_location *al)
1382 {
1383 thread__zput(al->thread);
1384 }
1385
1386 bool is_bts_event(struct perf_event_attr *attr)
1387 {
1388 return attr->type == PERF_TYPE_HARDWARE &&
1389 (attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
1390 attr->sample_period == 1;
1391 }
1392
1393 bool sample_addr_correlates_sym(struct perf_event_attr *attr)
1394 {
1395 if (attr->type == PERF_TYPE_SOFTWARE &&
1396 (attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
1397 attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
1398 attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
1399 return true;
1400
1401 if (is_bts_event(attr))
1402 return true;
1403
1404 return false;
1405 }
1406
1407 void thread__resolve(struct thread *thread, struct addr_location *al,
1408 struct perf_sample *sample)
1409 {
1410 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->addr, al);
1411 if (!al->map)
1412 thread__find_addr_map(thread, sample->cpumode, MAP__VARIABLE,
1413 sample->addr, al);
1414
1415 al->cpu = sample->cpu;
1416 al->sym = NULL;
1417
1418 if (al->map)
1419 al->sym = map__find_symbol(al->map, al->addr, NULL);
1420 }
Linux kernel - Deliverables
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