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lib: lz4: cleanup unaligned access efficiency detection
[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 };
49
50 const char *perf_event__name(unsigned int id)
51 {
52 if (id >= ARRAY_SIZE(perf_event__names))
53 return "INVALID";
54 if (!perf_event__names[id])
55 return "UNKNOWN";
56 return perf_event__names[id];
57 }
58
59 static struct perf_sample synth_sample = {
60 .pid = -1,
61 .tid = -1,
62 .time = -1,
63 .stream_id = -1,
64 .cpu = -1,
65 .period = 1,
66 };
67
68 /*
69 * Assumes that the first 4095 bytes of /proc/pid/stat contains
70 * the comm, tgid and ppid.
71 */
72 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
73 pid_t *tgid, pid_t *ppid)
74 {
75 char filename[PATH_MAX];
76 char bf[4096];
77 int fd;
78 size_t size = 0;
79 ssize_t n;
80 char *nl, *name, *tgids, *ppids;
81
82 *tgid = -1;
83 *ppid = -1;
84
85 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
86
87 fd = open(filename, O_RDONLY);
88 if (fd < 0) {
89 pr_debug("couldn't open %s\n", filename);
90 return -1;
91 }
92
93 n = read(fd, bf, sizeof(bf) - 1);
94 close(fd);
95 if (n <= 0) {
96 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
97 pid);
98 return -1;
99 }
100 bf[n] = '\0';
101
102 name = strstr(bf, "Name:");
103 tgids = strstr(bf, "Tgid:");
104 ppids = strstr(bf, "PPid:");
105
106 if (name) {
107 name += 5; /* strlen("Name:") */
108
109 while (*name && isspace(*name))
110 ++name;
111
112 nl = strchr(name, '\n');
113 if (nl)
114 *nl = '\0';
115
116 size = strlen(name);
117 if (size >= len)
118 size = len - 1;
119 memcpy(comm, name, size);
120 comm[size] = '\0';
121 } else {
122 pr_debug("Name: string not found for pid %d\n", pid);
123 }
124
125 if (tgids) {
126 tgids += 5; /* strlen("Tgid:") */
127 *tgid = atoi(tgids);
128 } else {
129 pr_debug("Tgid: string not found for pid %d\n", pid);
130 }
131
132 if (ppids) {
133 ppids += 5; /* strlen("PPid:") */
134 *ppid = atoi(ppids);
135 } else {
136 pr_debug("PPid: string not found for pid %d\n", pid);
137 }
138
139 return 0;
140 }
141
142 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
143 struct machine *machine,
144 pid_t *tgid, pid_t *ppid)
145 {
146 size_t size;
147
148 *ppid = -1;
149
150 memset(&event->comm, 0, sizeof(event->comm));
151
152 if (machine__is_host(machine)) {
153 if (perf_event__get_comm_ids(pid, event->comm.comm,
154 sizeof(event->comm.comm),
155 tgid, ppid) != 0) {
156 return -1;
157 }
158 } else {
159 *tgid = machine->pid;
160 }
161
162 if (*tgid < 0)
163 return -1;
164
165 event->comm.pid = *tgid;
166 event->comm.header.type = PERF_RECORD_COMM;
167
168 size = strlen(event->comm.comm) + 1;
169 size = PERF_ALIGN(size, sizeof(u64));
170 memset(event->comm.comm + size, 0, machine->id_hdr_size);
171 event->comm.header.size = (sizeof(event->comm) -
172 (sizeof(event->comm.comm) - size) +
173 machine->id_hdr_size);
174 event->comm.tid = pid;
175
176 return 0;
177 }
178
179 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
180 union perf_event *event, pid_t pid,
181 perf_event__handler_t process,
182 struct machine *machine)
183 {
184 pid_t tgid, ppid;
185
186 if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
187 return -1;
188
189 if (process(tool, event, &synth_sample, machine) != 0)
190 return -1;
191
192 return tgid;
193 }
194
195 static int perf_event__synthesize_fork(struct perf_tool *tool,
196 union perf_event *event,
197 pid_t pid, pid_t tgid, pid_t ppid,
198 perf_event__handler_t process,
199 struct machine *machine)
200 {
201 memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
202
203 /*
204 * for main thread set parent to ppid from status file. For other
205 * threads set parent pid to main thread. ie., assume main thread
206 * spawns all threads in a process
207 */
208 if (tgid == pid) {
209 event->fork.ppid = ppid;
210 event->fork.ptid = ppid;
211 } else {
212 event->fork.ppid = tgid;
213 event->fork.ptid = tgid;
214 }
215 event->fork.pid = tgid;
216 event->fork.tid = pid;
217 event->fork.header.type = PERF_RECORD_FORK;
218
219 event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
220
221 if (process(tool, event, &synth_sample, machine) != 0)
222 return -1;
223
224 return 0;
225 }
226
227 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
228 union perf_event *event,
229 pid_t pid, pid_t tgid,
230 perf_event__handler_t process,
231 struct machine *machine,
232 bool mmap_data,
233 unsigned int proc_map_timeout)
234 {
235 char filename[PATH_MAX];
236 FILE *fp;
237 unsigned long long t;
238 bool truncation = false;
239 unsigned long long timeout = proc_map_timeout * 1000000ULL;
240 int rc = 0;
241
242 if (machine__is_default_guest(machine))
243 return 0;
244
245 snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
246 machine->root_dir, pid);
247
248 fp = fopen(filename, "r");
249 if (fp == NULL) {
250 /*
251 * We raced with a task exiting - just return:
252 */
253 pr_debug("couldn't open %s\n", filename);
254 return -1;
255 }
256
257 event->header.type = PERF_RECORD_MMAP2;
258 t = rdclock();
259
260 while (1) {
261 char bf[BUFSIZ];
262 char prot[5];
263 char execname[PATH_MAX];
264 char anonstr[] = "//anon";
265 unsigned int ino;
266 size_t size;
267 ssize_t n;
268
269 if (fgets(bf, sizeof(bf), fp) == NULL)
270 break;
271
272 if ((rdclock() - t) > timeout) {
273 pr_warning("Reading %s time out. "
274 "You may want to increase "
275 "the time limit by --proc-map-timeout\n",
276 filename);
277 truncation = true;
278 goto out;
279 }
280
281 /* ensure null termination since stack will be reused. */
282 strcpy(execname, "");
283
284 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
285 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %[^\n]\n",
286 &event->mmap2.start, &event->mmap2.len, prot,
287 &event->mmap2.pgoff, &event->mmap2.maj,
288 &event->mmap2.min,
289 &ino, execname);
290
291 /*
292 * Anon maps don't have the execname.
293 */
294 if (n < 7)
295 continue;
296
297 event->mmap2.ino = (u64)ino;
298
299 /*
300 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
301 */
302 if (machine__is_host(machine))
303 event->header.misc = PERF_RECORD_MISC_USER;
304 else
305 event->header.misc = PERF_RECORD_MISC_GUEST_USER;
306
307 /* map protection and flags bits */
308 event->mmap2.prot = 0;
309 event->mmap2.flags = 0;
310 if (prot[0] == 'r')
311 event->mmap2.prot |= PROT_READ;
312 if (prot[1] == 'w')
313 event->mmap2.prot |= PROT_WRITE;
314 if (prot[2] == 'x')
315 event->mmap2.prot |= PROT_EXEC;
316
317 if (prot[3] == 's')
318 event->mmap2.flags |= MAP_SHARED;
319 else
320 event->mmap2.flags |= MAP_PRIVATE;
321
322 if (prot[2] != 'x') {
323 if (!mmap_data || prot[0] != 'r')
324 continue;
325
326 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
327 }
328
329 out:
330 if (truncation)
331 event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
332
333 if (!strcmp(execname, ""))
334 strcpy(execname, anonstr);
335
336 size = strlen(execname) + 1;
337 memcpy(event->mmap2.filename, execname, size);
338 size = PERF_ALIGN(size, sizeof(u64));
339 event->mmap2.len -= event->mmap.start;
340 event->mmap2.header.size = (sizeof(event->mmap2) -
341 (sizeof(event->mmap2.filename) - size));
342 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
343 event->mmap2.header.size += machine->id_hdr_size;
344 event->mmap2.pid = tgid;
345 event->mmap2.tid = pid;
346
347 if (process(tool, event, &synth_sample, machine) != 0) {
348 rc = -1;
349 break;
350 }
351
352 if (truncation)
353 break;
354 }
355
356 fclose(fp);
357 return rc;
358 }
359
360 int perf_event__synthesize_modules(struct perf_tool *tool,
361 perf_event__handler_t process,
362 struct machine *machine)
363 {
364 int rc = 0;
365 struct map *pos;
366 struct map_groups *kmaps = &machine->kmaps;
367 struct maps *maps = &kmaps->maps[MAP__FUNCTION];
368 union perf_event *event = zalloc((sizeof(event->mmap) +
369 machine->id_hdr_size));
370 if (event == NULL) {
371 pr_debug("Not enough memory synthesizing mmap event "
372 "for kernel modules\n");
373 return -1;
374 }
375
376 event->header.type = PERF_RECORD_MMAP;
377
378 /*
379 * kernel uses 0 for user space maps, see kernel/perf_event.c
380 * __perf_event_mmap
381 */
382 if (machine__is_host(machine))
383 event->header.misc = PERF_RECORD_MISC_KERNEL;
384 else
385 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
386
387 for (pos = maps__first(maps); pos; pos = map__next(pos)) {
388 size_t size;
389
390 if (__map__is_kernel(pos))
391 continue;
392
393 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
394 event->mmap.header.type = PERF_RECORD_MMAP;
395 event->mmap.header.size = (sizeof(event->mmap) -
396 (sizeof(event->mmap.filename) - size));
397 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
398 event->mmap.header.size += machine->id_hdr_size;
399 event->mmap.start = pos->start;
400 event->mmap.len = pos->end - pos->start;
401 event->mmap.pid = machine->pid;
402
403 memcpy(event->mmap.filename, pos->dso->long_name,
404 pos->dso->long_name_len + 1);
405 if (process(tool, event, &synth_sample, machine) != 0) {
406 rc = -1;
407 break;
408 }
409 }
410
411 free(event);
412 return rc;
413 }
414
415 static int __event__synthesize_thread(union perf_event *comm_event,
416 union perf_event *mmap_event,
417 union perf_event *fork_event,
418 pid_t pid, int full,
419 perf_event__handler_t process,
420 struct perf_tool *tool,
421 struct machine *machine,
422 bool mmap_data,
423 unsigned int proc_map_timeout)
424 {
425 char filename[PATH_MAX];
426 DIR *tasks;
427 struct dirent dirent, *next;
428 pid_t tgid, ppid;
429 int rc = 0;
430
431 /* special case: only send one comm event using passed in pid */
432 if (!full) {
433 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
434 process, machine);
435
436 if (tgid == -1)
437 return -1;
438
439 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
440 process, machine, mmap_data,
441 proc_map_timeout);
442 }
443
444 if (machine__is_default_guest(machine))
445 return 0;
446
447 snprintf(filename, sizeof(filename), "%s/proc/%d/task",
448 machine->root_dir, pid);
449
450 tasks = opendir(filename);
451 if (tasks == NULL) {
452 pr_debug("couldn't open %s\n", filename);
453 return 0;
454 }
455
456 while (!readdir_r(tasks, &dirent, &next) && next) {
457 char *end;
458 pid_t _pid;
459
460 _pid = strtol(dirent.d_name, &end, 10);
461 if (*end)
462 continue;
463
464 rc = -1;
465 if (perf_event__prepare_comm(comm_event, _pid, machine,
466 &tgid, &ppid) != 0)
467 break;
468
469 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
470 ppid, process, machine) < 0)
471 break;
472 /*
473 * Send the prepared comm event
474 */
475 if (process(tool, comm_event, &synth_sample, machine) != 0)
476 break;
477
478 rc = 0;
479 if (_pid == pid) {
480 /* process the parent's maps too */
481 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
482 process, machine, mmap_data, proc_map_timeout);
483 if (rc)
484 break;
485 }
486 }
487
488 closedir(tasks);
489 return rc;
490 }
491
492 int perf_event__synthesize_thread_map(struct perf_tool *tool,
493 struct thread_map *threads,
494 perf_event__handler_t process,
495 struct machine *machine,
496 bool mmap_data,
497 unsigned int proc_map_timeout)
498 {
499 union perf_event *comm_event, *mmap_event, *fork_event;
500 int err = -1, thread, j;
501
502 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
503 if (comm_event == NULL)
504 goto out;
505
506 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
507 if (mmap_event == NULL)
508 goto out_free_comm;
509
510 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
511 if (fork_event == NULL)
512 goto out_free_mmap;
513
514 err = 0;
515 for (thread = 0; thread < threads->nr; ++thread) {
516 if (__event__synthesize_thread(comm_event, mmap_event,
517 fork_event,
518 thread_map__pid(threads, thread), 0,
519 process, tool, machine,
520 mmap_data, proc_map_timeout)) {
521 err = -1;
522 break;
523 }
524
525 /*
526 * comm.pid is set to thread group id by
527 * perf_event__synthesize_comm
528 */
529 if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
530 bool need_leader = true;
531
532 /* is thread group leader in thread_map? */
533 for (j = 0; j < threads->nr; ++j) {
534 if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
535 need_leader = false;
536 break;
537 }
538 }
539
540 /* if not, generate events for it */
541 if (need_leader &&
542 __event__synthesize_thread(comm_event, mmap_event,
543 fork_event,
544 comm_event->comm.pid, 0,
545 process, tool, machine,
546 mmap_data, proc_map_timeout)) {
547 err = -1;
548 break;
549 }
550 }
551 }
552 free(fork_event);
553 out_free_mmap:
554 free(mmap_event);
555 out_free_comm:
556 free(comm_event);
557 out:
558 return err;
559 }
560
561 int perf_event__synthesize_threads(struct perf_tool *tool,
562 perf_event__handler_t process,
563 struct machine *machine,
564 bool mmap_data,
565 unsigned int proc_map_timeout)
566 {
567 DIR *proc;
568 char proc_path[PATH_MAX];
569 struct dirent dirent, *next;
570 union perf_event *comm_event, *mmap_event, *fork_event;
571 int err = -1;
572
573 if (machine__is_default_guest(machine))
574 return 0;
575
576 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
577 if (comm_event == NULL)
578 goto out;
579
580 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
581 if (mmap_event == NULL)
582 goto out_free_comm;
583
584 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
585 if (fork_event == NULL)
586 goto out_free_mmap;
587
588 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
589 proc = opendir(proc_path);
590
591 if (proc == NULL)
592 goto out_free_fork;
593
594 while (!readdir_r(proc, &dirent, &next) && next) {
595 char *end;
596 pid_t pid = strtol(dirent.d_name, &end, 10);
597
598 if (*end) /* only interested in proper numerical dirents */
599 continue;
600 /*
601 * We may race with exiting thread, so don't stop just because
602 * one thread couldn't be synthesized.
603 */
604 __event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
605 1, process, tool, machine, mmap_data,
606 proc_map_timeout);
607 }
608
609 err = 0;
610 closedir(proc);
611 out_free_fork:
612 free(fork_event);
613 out_free_mmap:
614 free(mmap_event);
615 out_free_comm:
616 free(comm_event);
617 out:
618 return err;
619 }
620
621 struct process_symbol_args {
622 const char *name;
623 u64 start;
624 };
625
626 static int find_symbol_cb(void *arg, const char *name, char type,
627 u64 start)
628 {
629 struct process_symbol_args *args = arg;
630
631 /*
632 * Must be a function or at least an alias, as in PARISC64, where "_text" is
633 * an 'A' to the same address as "_stext".
634 */
635 if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
636 type == 'A') || strcmp(name, args->name))
637 return 0;
638
639 args->start = start;
640 return 1;
641 }
642
643 u64 kallsyms__get_function_start(const char *kallsyms_filename,
644 const char *symbol_name)
645 {
646 struct process_symbol_args args = { .name = symbol_name, };
647
648 if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
649 return 0;
650
651 return args.start;
652 }
653
654 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
655 perf_event__handler_t process,
656 struct machine *machine)
657 {
658 size_t size;
659 const char *mmap_name;
660 char name_buff[PATH_MAX];
661 struct map *map = machine__kernel_map(machine);
662 struct kmap *kmap;
663 int err;
664 union perf_event *event;
665
666 if (map == NULL)
667 return -1;
668
669 /*
670 * We should get this from /sys/kernel/sections/.text, but till that is
671 * available use this, and after it is use this as a fallback for older
672 * kernels.
673 */
674 event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
675 if (event == NULL) {
676 pr_debug("Not enough memory synthesizing mmap event "
677 "for kernel modules\n");
678 return -1;
679 }
680
681 mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
682 if (machine__is_host(machine)) {
683 /*
684 * kernel uses PERF_RECORD_MISC_USER for user space maps,
685 * see kernel/perf_event.c __perf_event_mmap
686 */
687 event->header.misc = PERF_RECORD_MISC_KERNEL;
688 } else {
689 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
690 }
691
692 kmap = map__kmap(map);
693 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
694 "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
695 size = PERF_ALIGN(size, sizeof(u64));
696 event->mmap.header.type = PERF_RECORD_MMAP;
697 event->mmap.header.size = (sizeof(event->mmap) -
698 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
699 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
700 event->mmap.start = map->start;
701 event->mmap.len = map->end - event->mmap.start;
702 event->mmap.pid = machine->pid;
703
704 err = process(tool, event, &synth_sample, machine);
705 free(event);
706
707 return err;
708 }
709
710 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
711 struct thread_map *threads,
712 perf_event__handler_t process,
713 struct machine *machine)
714 {
715 union perf_event *event;
716 int i, err, size;
717
718 size = sizeof(event->thread_map);
719 size += threads->nr * sizeof(event->thread_map.entries[0]);
720
721 event = zalloc(size);
722 if (!event)
723 return -ENOMEM;
724
725 event->header.type = PERF_RECORD_THREAD_MAP;
726 event->header.size = size;
727 event->thread_map.nr = threads->nr;
728
729 for (i = 0; i < threads->nr; i++) {
730 struct thread_map_event_entry *entry = &event->thread_map.entries[i];
731 char *comm = thread_map__comm(threads, i);
732
733 if (!comm)
734 comm = (char *) "";
735
736 entry->pid = thread_map__pid(threads, i);
737 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
738 }
739
740 err = process(tool, event, NULL, machine);
741
742 free(event);
743 return err;
744 }
745
746 static void synthesize_cpus(struct cpu_map_entries *cpus,
747 struct cpu_map *map)
748 {
749 int i;
750
751 cpus->nr = map->nr;
752
753 for (i = 0; i < map->nr; i++)
754 cpus->cpu[i] = map->map[i];
755 }
756
757 static void synthesize_mask(struct cpu_map_mask *mask,
758 struct cpu_map *map, int max)
759 {
760 int i;
761
762 mask->nr = BITS_TO_LONGS(max);
763 mask->long_size = sizeof(long);
764
765 for (i = 0; i < map->nr; i++)
766 set_bit(map->map[i], mask->mask);
767 }
768
769 static size_t cpus_size(struct cpu_map *map)
770 {
771 return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
772 }
773
774 static size_t mask_size(struct cpu_map *map, int *max)
775 {
776 int i;
777
778 *max = 0;
779
780 for (i = 0; i < map->nr; i++) {
781 /* bit possition of the cpu is + 1 */
782 int bit = map->map[i] + 1;
783
784 if (bit > *max)
785 *max = bit;
786 }
787
788 return sizeof(struct cpu_map_mask) + BITS_TO_LONGS(*max) * sizeof(long);
789 }
790
791 void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max)
792 {
793 size_t size_cpus, size_mask;
794 bool is_dummy = cpu_map__empty(map);
795
796 /*
797 * Both array and mask data have variable size based
798 * on the number of cpus and their actual values.
799 * The size of the 'struct cpu_map_data' is:
800 *
801 * array = size of 'struct cpu_map_entries' +
802 * number of cpus * sizeof(u64)
803 *
804 * mask = size of 'struct cpu_map_mask' +
805 * maximum cpu bit converted to size of longs
806 *
807 * and finaly + the size of 'struct cpu_map_data'.
808 */
809 size_cpus = cpus_size(map);
810 size_mask = mask_size(map, max);
811
812 if (is_dummy || (size_cpus < size_mask)) {
813 *size += size_cpus;
814 *type = PERF_CPU_MAP__CPUS;
815 } else {
816 *size += size_mask;
817 *type = PERF_CPU_MAP__MASK;
818 }
819
820 *size += sizeof(struct cpu_map_data);
821 return zalloc(*size);
822 }
823
824 void cpu_map_data__synthesize(struct cpu_map_data *data, struct cpu_map *map,
825 u16 type, int max)
826 {
827 data->type = type;
828
829 switch (type) {
830 case PERF_CPU_MAP__CPUS:
831 synthesize_cpus((struct cpu_map_entries *) data->data, map);
832 break;
833 case PERF_CPU_MAP__MASK:
834 synthesize_mask((struct cpu_map_mask *) data->data, map, max);
835 default:
836 break;
837 };
838 }
839
840 static struct cpu_map_event* cpu_map_event__new(struct cpu_map *map)
841 {
842 size_t size = sizeof(struct cpu_map_event);
843 struct cpu_map_event *event;
844 int max;
845 u16 type;
846
847 event = cpu_map_data__alloc(map, &size, &type, &max);
848 if (!event)
849 return NULL;
850
851 event->header.type = PERF_RECORD_CPU_MAP;
852 event->header.size = size;
853 event->data.type = type;
854
855 cpu_map_data__synthesize(&event->data, map, type, max);
856 return event;
857 }
858
859 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
860 struct cpu_map *map,
861 perf_event__handler_t process,
862 struct machine *machine)
863 {
864 struct cpu_map_event *event;
865 int err;
866
867 event = cpu_map_event__new(map);
868 if (!event)
869 return -ENOMEM;
870
871 err = process(tool, (union perf_event *) event, NULL, machine);
872
873 free(event);
874 return err;
875 }
876
877 int perf_event__synthesize_stat_config(struct perf_tool *tool,
878 struct perf_stat_config *config,
879 perf_event__handler_t process,
880 struct machine *machine)
881 {
882 struct stat_config_event *event;
883 int size, i = 0, err;
884
885 size = sizeof(*event);
886 size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
887
888 event = zalloc(size);
889 if (!event)
890 return -ENOMEM;
891
892 event->header.type = PERF_RECORD_STAT_CONFIG;
893 event->header.size = size;
894 event->nr = PERF_STAT_CONFIG_TERM__MAX;
895
896 #define ADD(__term, __val) \
897 event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \
898 event->data[i].val = __val; \
899 i++;
900
901 ADD(AGGR_MODE, config->aggr_mode)
902 ADD(INTERVAL, config->interval)
903 ADD(SCALE, config->scale)
904
905 WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
906 "stat config terms unbalanced\n");
907 #undef ADD
908
909 err = process(tool, (union perf_event *) event, NULL, machine);
910
911 free(event);
912 return err;
913 }
914
915 int perf_event__synthesize_stat(struct perf_tool *tool,
916 u32 cpu, u32 thread, u64 id,
917 struct perf_counts_values *count,
918 perf_event__handler_t process,
919 struct machine *machine)
920 {
921 struct stat_event event;
922
923 event.header.type = PERF_RECORD_STAT;
924 event.header.size = sizeof(event);
925 event.header.misc = 0;
926
927 event.id = id;
928 event.cpu = cpu;
929 event.thread = thread;
930 event.val = count->val;
931 event.ena = count->ena;
932 event.run = count->run;
933
934 return process(tool, (union perf_event *) &event, NULL, machine);
935 }
936
937 int perf_event__synthesize_stat_round(struct perf_tool *tool,
938 u64 evtime, u64 type,
939 perf_event__handler_t process,
940 struct machine *machine)
941 {
942 struct stat_round_event event;
943
944 event.header.type = PERF_RECORD_STAT_ROUND;
945 event.header.size = sizeof(event);
946 event.header.misc = 0;
947
948 event.time = evtime;
949 event.type = type;
950
951 return process(tool, (union perf_event *) &event, NULL, machine);
952 }
953
954 void perf_event__read_stat_config(struct perf_stat_config *config,
955 struct stat_config_event *event)
956 {
957 unsigned i;
958
959 for (i = 0; i < event->nr; i++) {
960
961 switch (event->data[i].tag) {
962 #define CASE(__term, __val) \
963 case PERF_STAT_CONFIG_TERM__##__term: \
964 config->__val = event->data[i].val; \
965 break;
966
967 CASE(AGGR_MODE, aggr_mode)
968 CASE(SCALE, scale)
969 CASE(INTERVAL, interval)
970 #undef CASE
971 default:
972 pr_warning("unknown stat config term %" PRIu64 "\n",
973 event->data[i].tag);
974 }
975 }
976 }
977
978 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
979 {
980 const char *s;
981
982 if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
983 s = " exec";
984 else
985 s = "";
986
987 return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
988 }
989
990 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
991 union perf_event *event,
992 struct perf_sample *sample,
993 struct machine *machine)
994 {
995 return machine__process_comm_event(machine, event, sample);
996 }
997
998 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
999 union perf_event *event,
1000 struct perf_sample *sample,
1001 struct machine *machine)
1002 {
1003 return machine__process_lost_event(machine, event, sample);
1004 }
1005
1006 int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
1007 union perf_event *event,
1008 struct perf_sample *sample __maybe_unused,
1009 struct machine *machine)
1010 {
1011 return machine__process_aux_event(machine, event);
1012 }
1013
1014 int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
1015 union perf_event *event,
1016 struct perf_sample *sample __maybe_unused,
1017 struct machine *machine)
1018 {
1019 return machine__process_itrace_start_event(machine, event);
1020 }
1021
1022 int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
1023 union perf_event *event,
1024 struct perf_sample *sample,
1025 struct machine *machine)
1026 {
1027 return machine__process_lost_samples_event(machine, event, sample);
1028 }
1029
1030 int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
1031 union perf_event *event,
1032 struct perf_sample *sample __maybe_unused,
1033 struct machine *machine)
1034 {
1035 return machine__process_switch_event(machine, event);
1036 }
1037
1038 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
1039 {
1040 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
1041 event->mmap.pid, event->mmap.tid, event->mmap.start,
1042 event->mmap.len, event->mmap.pgoff,
1043 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
1044 event->mmap.filename);
1045 }
1046
1047 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
1048 {
1049 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
1050 " %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
1051 event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
1052 event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
1053 event->mmap2.min, event->mmap2.ino,
1054 event->mmap2.ino_generation,
1055 (event->mmap2.prot & PROT_READ) ? 'r' : '-',
1056 (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
1057 (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
1058 (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
1059 event->mmap2.filename);
1060 }
1061
1062 size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp)
1063 {
1064 struct thread_map *threads = thread_map__new_event(&event->thread_map);
1065 size_t ret;
1066
1067 ret = fprintf(fp, " nr: ");
1068
1069 if (threads)
1070 ret += thread_map__fprintf(threads, fp);
1071 else
1072 ret += fprintf(fp, "failed to get threads from event\n");
1073
1074 thread_map__put(threads);
1075 return ret;
1076 }
1077
1078 size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp)
1079 {
1080 struct cpu_map *cpus = cpu_map__new_data(&event->cpu_map.data);
1081 size_t ret;
1082
1083 ret = fprintf(fp, " nr: ");
1084
1085 if (cpus)
1086 ret += cpu_map__fprintf(cpus, fp);
1087 else
1088 ret += fprintf(fp, "failed to get cpumap from event\n");
1089
1090 cpu_map__put(cpus);
1091 return ret;
1092 }
1093
1094 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
1095 union perf_event *event,
1096 struct perf_sample *sample,
1097 struct machine *machine)
1098 {
1099 return machine__process_mmap_event(machine, event, sample);
1100 }
1101
1102 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
1103 union perf_event *event,
1104 struct perf_sample *sample,
1105 struct machine *machine)
1106 {
1107 return machine__process_mmap2_event(machine, event, sample);
1108 }
1109
1110 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
1111 {
1112 return fprintf(fp, "(%d:%d):(%d:%d)\n",
1113 event->fork.pid, event->fork.tid,
1114 event->fork.ppid, event->fork.ptid);
1115 }
1116
1117 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
1118 union perf_event *event,
1119 struct perf_sample *sample,
1120 struct machine *machine)
1121 {
1122 return machine__process_fork_event(machine, event, sample);
1123 }
1124
1125 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
1126 union perf_event *event,
1127 struct perf_sample *sample,
1128 struct machine *machine)
1129 {
1130 return machine__process_exit_event(machine, event, sample);
1131 }
1132
1133 size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
1134 {
1135 return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s]\n",
1136 event->aux.aux_offset, event->aux.aux_size,
1137 event->aux.flags,
1138 event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
1139 event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "");
1140 }
1141
1142 size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
1143 {
1144 return fprintf(fp, " pid: %u tid: %u\n",
1145 event->itrace_start.pid, event->itrace_start.tid);
1146 }
1147
1148 size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
1149 {
1150 bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
1151 const char *in_out = out ? "OUT" : "IN ";
1152
1153 if (event->header.type == PERF_RECORD_SWITCH)
1154 return fprintf(fp, " %s\n", in_out);
1155
1156 return fprintf(fp, " %s %s pid/tid: %5u/%-5u\n",
1157 in_out, out ? "next" : "prev",
1158 event->context_switch.next_prev_pid,
1159 event->context_switch.next_prev_tid);
1160 }
1161
1162 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
1163 {
1164 size_t ret = fprintf(fp, "PERF_RECORD_%s",
1165 perf_event__name(event->header.type));
1166
1167 switch (event->header.type) {
1168 case PERF_RECORD_COMM:
1169 ret += perf_event__fprintf_comm(event, fp);
1170 break;
1171 case PERF_RECORD_FORK:
1172 case PERF_RECORD_EXIT:
1173 ret += perf_event__fprintf_task(event, fp);
1174 break;
1175 case PERF_RECORD_MMAP:
1176 ret += perf_event__fprintf_mmap(event, fp);
1177 break;
1178 case PERF_RECORD_MMAP2:
1179 ret += perf_event__fprintf_mmap2(event, fp);
1180 break;
1181 case PERF_RECORD_AUX:
1182 ret += perf_event__fprintf_aux(event, fp);
1183 break;
1184 case PERF_RECORD_ITRACE_START:
1185 ret += perf_event__fprintf_itrace_start(event, fp);
1186 break;
1187 case PERF_RECORD_SWITCH:
1188 case PERF_RECORD_SWITCH_CPU_WIDE:
1189 ret += perf_event__fprintf_switch(event, fp);
1190 break;
1191 default:
1192 ret += fprintf(fp, "\n");
1193 }
1194
1195 return ret;
1196 }
1197
1198 int perf_event__process(struct perf_tool *tool __maybe_unused,
1199 union perf_event *event,
1200 struct perf_sample *sample,
1201 struct machine *machine)
1202 {
1203 return machine__process_event(machine, event, sample);
1204 }
1205
1206 void thread__find_addr_map(struct thread *thread, u8 cpumode,
1207 enum map_type type, u64 addr,
1208 struct addr_location *al)
1209 {
1210 struct map_groups *mg = thread->mg;
1211 struct machine *machine = mg->machine;
1212 bool load_map = false;
1213
1214 al->machine = machine;
1215 al->thread = thread;
1216 al->addr = addr;
1217 al->cpumode = cpumode;
1218 al->filtered = 0;
1219
1220 if (machine == NULL) {
1221 al->map = NULL;
1222 return;
1223 }
1224
1225 if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
1226 al->level = 'k';
1227 mg = &machine->kmaps;
1228 load_map = true;
1229 } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
1230 al->level = '.';
1231 } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
1232 al->level = 'g';
1233 mg = &machine->kmaps;
1234 load_map = true;
1235 } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
1236 al->level = 'u';
1237 } else {
1238 al->level = 'H';
1239 al->map = NULL;
1240
1241 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
1242 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
1243 !perf_guest)
1244 al->filtered |= (1 << HIST_FILTER__GUEST);
1245 if ((cpumode == PERF_RECORD_MISC_USER ||
1246 cpumode == PERF_RECORD_MISC_KERNEL) &&
1247 !perf_host)
1248 al->filtered |= (1 << HIST_FILTER__HOST);
1249
1250 return;
1251 }
1252 try_again:
1253 al->map = map_groups__find(mg, type, al->addr);
1254 if (al->map == NULL) {
1255 /*
1256 * If this is outside of all known maps, and is a negative
1257 * address, try to look it up in the kernel dso, as it might be
1258 * a vsyscall or vdso (which executes in user-mode).
1259 *
1260 * XXX This is nasty, we should have a symbol list in the
1261 * "[vdso]" dso, but for now lets use the old trick of looking
1262 * in the whole kernel symbol list.
1263 */
1264 if (cpumode == PERF_RECORD_MISC_USER && machine &&
1265 mg != &machine->kmaps &&
1266 machine__kernel_ip(machine, al->addr)) {
1267 mg = &machine->kmaps;
1268 load_map = true;
1269 goto try_again;
1270 }
1271 } else {
1272 /*
1273 * Kernel maps might be changed when loading symbols so loading
1274 * must be done prior to using kernel maps.
1275 */
1276 if (load_map)
1277 map__load(al->map, machine->symbol_filter);
1278 al->addr = al->map->map_ip(al->map, al->addr);
1279 }
1280 }
1281
1282 void thread__find_addr_location(struct thread *thread,
1283 u8 cpumode, enum map_type type, u64 addr,
1284 struct addr_location *al)
1285 {
1286 thread__find_addr_map(thread, cpumode, type, addr, al);
1287 if (al->map != NULL)
1288 al->sym = map__find_symbol(al->map, al->addr,
1289 thread->mg->machine->symbol_filter);
1290 else
1291 al->sym = NULL;
1292 }
1293
1294 /*
1295 * Callers need to drop the reference to al->thread, obtained in
1296 * machine__findnew_thread()
1297 */
1298 int machine__resolve(struct machine *machine, struct addr_location *al,
1299 struct perf_sample *sample)
1300 {
1301 struct thread *thread = machine__findnew_thread(machine, sample->pid,
1302 sample->tid);
1303
1304 if (thread == NULL)
1305 return -1;
1306
1307 dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
1308 /*
1309 * Have we already created the kernel maps for this machine?
1310 *
1311 * This should have happened earlier, when we processed the kernel MMAP
1312 * events, but for older perf.data files there was no such thing, so do
1313 * it now.
1314 */
1315 if (sample->cpumode == PERF_RECORD_MISC_KERNEL &&
1316 machine__kernel_map(machine) == NULL)
1317 machine__create_kernel_maps(machine);
1318
1319 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, al);
1320 dump_printf(" ...... dso: %s\n",
1321 al->map ? al->map->dso->long_name :
1322 al->level == 'H' ? "[hypervisor]" : "<not found>");
1323
1324 if (thread__is_filtered(thread))
1325 al->filtered |= (1 << HIST_FILTER__THREAD);
1326
1327 al->sym = NULL;
1328 al->cpu = sample->cpu;
1329 al->socket = -1;
1330
1331 if (al->cpu >= 0) {
1332 struct perf_env *env = machine->env;
1333
1334 if (env && env->cpu)
1335 al->socket = env->cpu[al->cpu].socket_id;
1336 }
1337
1338 if (al->map) {
1339 struct dso *dso = al->map->dso;
1340
1341 if (symbol_conf.dso_list &&
1342 (!dso || !(strlist__has_entry(symbol_conf.dso_list,
1343 dso->short_name) ||
1344 (dso->short_name != dso->long_name &&
1345 strlist__has_entry(symbol_conf.dso_list,
1346 dso->long_name))))) {
1347 al->filtered |= (1 << HIST_FILTER__DSO);
1348 }
1349
1350 al->sym = map__find_symbol(al->map, al->addr,
1351 machine->symbol_filter);
1352 }
1353
1354 if (symbol_conf.sym_list &&
1355 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
1356 al->sym->name))) {
1357 al->filtered |= (1 << HIST_FILTER__SYMBOL);
1358 }
1359
1360 return 0;
1361 }
1362
1363 /*
1364 * The preprocess_sample method will return with reference counts for the
1365 * in it, when done using (and perhaps getting ref counts if needing to
1366 * keep a pointer to one of those entries) it must be paired with
1367 * addr_location__put(), so that the refcounts can be decremented.
1368 */
1369 void addr_location__put(struct addr_location *al)
1370 {
1371 thread__zput(al->thread);
1372 }
1373
1374 bool is_bts_event(struct perf_event_attr *attr)
1375 {
1376 return attr->type == PERF_TYPE_HARDWARE &&
1377 (attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
1378 attr->sample_period == 1;
1379 }
1380
1381 bool sample_addr_correlates_sym(struct perf_event_attr *attr)
1382 {
1383 if (attr->type == PERF_TYPE_SOFTWARE &&
1384 (attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
1385 attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
1386 attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
1387 return true;
1388
1389 if (is_bts_event(attr))
1390 return true;
1391
1392 return false;
1393 }
1394
1395 void thread__resolve(struct thread *thread, struct addr_location *al,
1396 struct perf_sample *sample)
1397 {
1398 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->addr, al);
1399 if (!al->map)
1400 thread__find_addr_map(thread, sample->cpumode, MAP__VARIABLE,
1401 sample->addr, al);
1402
1403 al->cpu = sample->cpu;
1404 al->sym = NULL;
1405
1406 if (al->map)
1407 al->sym = map__find_symbol(al->map, al->addr, NULL);
1408 }
Linux kernel - Deliverables
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