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vmxnet3: Fix inconsistent LRO state after initialization
[linux-2.6/linux-mips.git] / tools / perf / util / session.c
blobcaa224522fea9b0ff04984595a09e2eccd31e438
1 #define _FILE_OFFSET_BITS 64
2
3 #include <linux/kernel.h>
4
5 #include <byteswap.h>
6 #include <unistd.h>
7 #include <sys/types.h>
8 #include <sys/mman.h>
9
10 #include "evlist.h"
11 #include "evsel.h"
12 #include "session.h"
13 #include "sort.h"
14 #include "util.h"
15
16 static int perf_session__open(struct perf_session *self, bool force)
17 {
18 struct stat input_stat;
19
20 if (!strcmp(self->filename, "-")) {
21 self->fd_pipe = true;
22 self->fd = STDIN_FILENO;
23
24 if (perf_session__read_header(self, self->fd) < 0)
25 pr_err("incompatible file format");
26
27 return 0;
28 }
29
30 self->fd = open(self->filename, O_RDONLY);
31 if (self->fd < 0) {
32 int err = errno;
33
34 pr_err("failed to open %s: %s", self->filename, strerror(err));
35 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
36 pr_err(" (try 'perf record' first)");
37 pr_err("\n");
38 return -errno;
39 }
40
41 if (fstat(self->fd, &input_stat) < 0)
42 goto out_close;
43
44 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
45 pr_err("file %s not owned by current user or root\n",
46 self->filename);
47 goto out_close;
48 }
49
50 if (!input_stat.st_size) {
51 pr_info("zero-sized file (%s), nothing to do!\n",
52 self->filename);
53 goto out_close;
54 }
55
56 if (perf_session__read_header(self, self->fd) < 0) {
57 pr_err("incompatible file format");
58 goto out_close;
59 }
60
61 self->size = input_stat.st_size;
62 return 0;
63
64 out_close:
65 close(self->fd);
66 self->fd = -1;
67 return -1;
68 }
69
70 static void perf_session__id_header_size(struct perf_session *session)
71 {
72 struct perf_sample *data;
73 u64 sample_type = session->sample_type;
74 u16 size = 0;
75
76 if (!session->sample_id_all)
77 goto out;
78
79 if (sample_type & PERF_SAMPLE_TID)
80 size += sizeof(data->tid) * 2;
81
82 if (sample_type & PERF_SAMPLE_TIME)
83 size += sizeof(data->time);
84
85 if (sample_type & PERF_SAMPLE_ID)
86 size += sizeof(data->id);
87
88 if (sample_type & PERF_SAMPLE_STREAM_ID)
89 size += sizeof(data->stream_id);
90
91 if (sample_type & PERF_SAMPLE_CPU)
92 size += sizeof(data->cpu) * 2;
93 out:
94 session->id_hdr_size = size;
95 }
96
97 void perf_session__update_sample_type(struct perf_session *self)
98 {
99 self->sample_type = perf_evlist__sample_type(self->evlist);
100 self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
101 perf_session__id_header_size(self);
102 }
103
104 int perf_session__create_kernel_maps(struct perf_session *self)
105 {
106 int ret = machine__create_kernel_maps(&self->host_machine);
107
108 if (ret >= 0)
109 ret = machines__create_guest_kernel_maps(&self->machines);
110 return ret;
111 }
112
113 static void perf_session__destroy_kernel_maps(struct perf_session *self)
114 {
115 machine__destroy_kernel_maps(&self->host_machine);
116 machines__destroy_guest_kernel_maps(&self->machines);
117 }
118
119 struct perf_session *perf_session__new(const char *filename, int mode,
120 bool force, bool repipe,
121 struct perf_event_ops *ops)
122 {
123 size_t len = filename ? strlen(filename) + 1 : 0;
124 struct perf_session *self = zalloc(sizeof(*self) + len);
125
126 if (self == NULL)
127 goto out;
128
129 memcpy(self->filename, filename, len);
130 self->threads = RB_ROOT;
131 INIT_LIST_HEAD(&self->dead_threads);
132 self->last_match = NULL;
133 /*
134 * On 64bit we can mmap the data file in one go. No need for tiny mmap
135 * slices. On 32bit we use 32MB.
136 */
137 #if BITS_PER_LONG == 64
138 self->mmap_window = ULLONG_MAX;
139 #else
140 self->mmap_window = 32 * 1024 * 1024ULL;
141 #endif
142 self->machines = RB_ROOT;
143 self->repipe = repipe;
144 INIT_LIST_HEAD(&self->ordered_samples.samples);
145 INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
146 INIT_LIST_HEAD(&self->ordered_samples.to_free);
147 machine__init(&self->host_machine, "", HOST_KERNEL_ID);
148
149 if (mode == O_RDONLY) {
150 if (perf_session__open(self, force) < 0)
151 goto out_delete;
152 perf_session__update_sample_type(self);
153 } else if (mode == O_WRONLY) {
154 /*
155 * In O_RDONLY mode this will be performed when reading the
156 * kernel MMAP event, in perf_event__process_mmap().
157 */
158 if (perf_session__create_kernel_maps(self) < 0)
159 goto out_delete;
160 }
161
162 if (ops && ops->ordering_requires_timestamps &&
163 ops->ordered_samples && !self->sample_id_all) {
164 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
165 ops->ordered_samples = false;
166 }
167
168 out:
169 return self;
170 out_delete:
171 perf_session__delete(self);
172 return NULL;
173 }
174
175 static void perf_session__delete_dead_threads(struct perf_session *self)
176 {
177 struct thread *n, *t;
178
179 list_for_each_entry_safe(t, n, &self->dead_threads, node) {
180 list_del(&t->node);
181 thread__delete(t);
182 }
183 }
184
185 static void perf_session__delete_threads(struct perf_session *self)
186 {
187 struct rb_node *nd = rb_first(&self->threads);
188
189 while (nd) {
190 struct thread *t = rb_entry(nd, struct thread, rb_node);
191
192 rb_erase(&t->rb_node, &self->threads);
193 nd = rb_next(nd);
194 thread__delete(t);
195 }
196 }
197
198 void perf_session__delete(struct perf_session *self)
199 {
200 perf_session__destroy_kernel_maps(self);
201 perf_session__delete_dead_threads(self);
202 perf_session__delete_threads(self);
203 machine__exit(&self->host_machine);
204 close(self->fd);
205 free(self);
206 }
207
208 void perf_session__remove_thread(struct perf_session *self, struct thread *th)
209 {
210 self->last_match = NULL;
211 rb_erase(&th->rb_node, &self->threads);
212 /*
213 * We may have references to this thread, for instance in some hist_entry
214 * instances, so just move them to a separate list.
215 */
216 list_add_tail(&th->node, &self->dead_threads);
217 }
218
219 static bool symbol__match_parent_regex(struct symbol *sym)
220 {
221 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
222 return 1;
223
224 return 0;
225 }
226
227 int perf_session__resolve_callchain(struct perf_session *self,
228 struct thread *thread,
229 struct ip_callchain *chain,
230 struct symbol **parent)
231 {
232 u8 cpumode = PERF_RECORD_MISC_USER;
233 unsigned int i;
234 int err;
235
236 callchain_cursor_reset(&self->callchain_cursor);
237
238 for (i = 0; i < chain->nr; i++) {
239 u64 ip = chain->ips[i];
240 struct addr_location al;
241
242 if (ip >= PERF_CONTEXT_MAX) {
243 switch (ip) {
244 case PERF_CONTEXT_HV:
245 cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
246 case PERF_CONTEXT_KERNEL:
247 cpumode = PERF_RECORD_MISC_KERNEL; break;
248 case PERF_CONTEXT_USER:
249 cpumode = PERF_RECORD_MISC_USER; break;
250 default:
251 break;
252 }
253 continue;
254 }
255
256 al.filtered = false;
257 thread__find_addr_location(thread, self, cpumode,
258 MAP__FUNCTION, thread->pid, ip, &al, NULL);
259 if (al.sym != NULL) {
260 if (sort__has_parent && !*parent &&
261 symbol__match_parent_regex(al.sym))
262 *parent = al.sym;
263 if (!symbol_conf.use_callchain)
264 break;
265 }
266
267 err = callchain_cursor_append(&self->callchain_cursor,
268 ip, al.map, al.sym);
269 if (err)
270 return err;
271 }
272
273 return 0;
274 }
275
276 static int process_event_synth_stub(union perf_event *event __used,
277 struct perf_session *session __used)
278 {
279 dump_printf(": unhandled!\n");
280 return 0;
281 }
282
283 static int process_event_sample_stub(union perf_event *event __used,
284 struct perf_sample *sample __used,
285 struct perf_evsel *evsel __used,
286 struct perf_session *session __used)
287 {
288 dump_printf(": unhandled!\n");
289 return 0;
290 }
291
292 static int process_event_stub(union perf_event *event __used,
293 struct perf_sample *sample __used,
294 struct perf_session *session __used)
295 {
296 dump_printf(": unhandled!\n");
297 return 0;
298 }
299
300 static int process_finished_round_stub(union perf_event *event __used,
301 struct perf_session *session __used,
302 struct perf_event_ops *ops __used)
303 {
304 dump_printf(": unhandled!\n");
305 return 0;
306 }
307
308 static int process_finished_round(union perf_event *event,
309 struct perf_session *session,
310 struct perf_event_ops *ops);
311
312 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
313 {
314 if (handler->sample == NULL)
315 handler->sample = process_event_sample_stub;
316 if (handler->mmap == NULL)
317 handler->mmap = process_event_stub;
318 if (handler->comm == NULL)
319 handler->comm = process_event_stub;
320 if (handler->fork == NULL)
321 handler->fork = process_event_stub;
322 if (handler->exit == NULL)
323 handler->exit = process_event_stub;
324 if (handler->lost == NULL)
325 handler->lost = perf_event__process_lost;
326 if (handler->read == NULL)
327 handler->read = process_event_stub;
328 if (handler->throttle == NULL)
329 handler->throttle = process_event_stub;
330 if (handler->unthrottle == NULL)
331 handler->unthrottle = process_event_stub;
332 if (handler->attr == NULL)
333 handler->attr = process_event_synth_stub;
334 if (handler->event_type == NULL)
335 handler->event_type = process_event_synth_stub;
336 if (handler->tracing_data == NULL)
337 handler->tracing_data = process_event_synth_stub;
338 if (handler->build_id == NULL)
339 handler->build_id = process_event_synth_stub;
340 if (handler->finished_round == NULL) {
341 if (handler->ordered_samples)
342 handler->finished_round = process_finished_round;
343 else
344 handler->finished_round = process_finished_round_stub;
345 }
346 }
347
348 void mem_bswap_64(void *src, int byte_size)
349 {
350 u64 *m = src;
351
352 while (byte_size > 0) {
353 *m = bswap_64(*m);
354 byte_size -= sizeof(u64);
355 ++m;
356 }
357 }
358
359 static void perf_event__all64_swap(union perf_event *event)
360 {
361 struct perf_event_header *hdr = &event->header;
362 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
363 }
364
365 static void perf_event__comm_swap(union perf_event *event)
366 {
367 event->comm.pid = bswap_32(event->comm.pid);
368 event->comm.tid = bswap_32(event->comm.tid);
369 }
370
371 static void perf_event__mmap_swap(union perf_event *event)
372 {
373 event->mmap.pid = bswap_32(event->mmap.pid);
374 event->mmap.tid = bswap_32(event->mmap.tid);
375 event->mmap.start = bswap_64(event->mmap.start);
376 event->mmap.len = bswap_64(event->mmap.len);
377 event->mmap.pgoff = bswap_64(event->mmap.pgoff);
378 }
379
380 static void perf_event__task_swap(union perf_event *event)
381 {
382 event->fork.pid = bswap_32(event->fork.pid);
383 event->fork.tid = bswap_32(event->fork.tid);
384 event->fork.ppid = bswap_32(event->fork.ppid);
385 event->fork.ptid = bswap_32(event->fork.ptid);
386 event->fork.time = bswap_64(event->fork.time);
387 }
388
389 static void perf_event__read_swap(union perf_event *event)
390 {
391 event->read.pid = bswap_32(event->read.pid);
392 event->read.tid = bswap_32(event->read.tid);
393 event->read.value = bswap_64(event->read.value);
394 event->read.time_enabled = bswap_64(event->read.time_enabled);
395 event->read.time_running = bswap_64(event->read.time_running);
396 event->read.id = bswap_64(event->read.id);
397 }
398
399 static void perf_event__attr_swap(union perf_event *event)
400 {
401 size_t size;
402
403 event->attr.attr.type = bswap_32(event->attr.attr.type);
404 event->attr.attr.size = bswap_32(event->attr.attr.size);
405 event->attr.attr.config = bswap_64(event->attr.attr.config);
406 event->attr.attr.sample_period = bswap_64(event->attr.attr.sample_period);
407 event->attr.attr.sample_type = bswap_64(event->attr.attr.sample_type);
408 event->attr.attr.read_format = bswap_64(event->attr.attr.read_format);
409 event->attr.attr.wakeup_events = bswap_32(event->attr.attr.wakeup_events);
410 event->attr.attr.bp_type = bswap_32(event->attr.attr.bp_type);
411 event->attr.attr.bp_addr = bswap_64(event->attr.attr.bp_addr);
412 event->attr.attr.bp_len = bswap_64(event->attr.attr.bp_len);
413
414 size = event->header.size;
415 size -= (void *)&event->attr.id - (void *)event;
416 mem_bswap_64(event->attr.id, size);
417 }
418
419 static void perf_event__event_type_swap(union perf_event *event)
420 {
421 event->event_type.event_type.event_id =
422 bswap_64(event->event_type.event_type.event_id);
423 }
424
425 static void perf_event__tracing_data_swap(union perf_event *event)
426 {
427 event->tracing_data.size = bswap_32(event->tracing_data.size);
428 }
429
430 typedef void (*perf_event__swap_op)(union perf_event *event);
431
432 static perf_event__swap_op perf_event__swap_ops[] = {
433 [PERF_RECORD_MMAP] = perf_event__mmap_swap,
434 [PERF_RECORD_COMM] = perf_event__comm_swap,
435 [PERF_RECORD_FORK] = perf_event__task_swap,
436 [PERF_RECORD_EXIT] = perf_event__task_swap,
437 [PERF_RECORD_LOST] = perf_event__all64_swap,
438 [PERF_RECORD_READ] = perf_event__read_swap,
439 [PERF_RECORD_SAMPLE] = perf_event__all64_swap,
440 [PERF_RECORD_HEADER_ATTR] = perf_event__attr_swap,
441 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap,
442 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
443 [PERF_RECORD_HEADER_BUILD_ID] = NULL,
444 [PERF_RECORD_HEADER_MAX] = NULL,
445 };
446
447 struct sample_queue {
448 u64 timestamp;
449 u64 file_offset;
450 union perf_event *event;
451 struct list_head list;
452 };
453
454 static void perf_session_free_sample_buffers(struct perf_session *session)
455 {
456 struct ordered_samples *os = &session->ordered_samples;
457
458 while (!list_empty(&os->to_free)) {
459 struct sample_queue *sq;
460
461 sq = list_entry(os->to_free.next, struct sample_queue, list);
462 list_del(&sq->list);
463 free(sq);
464 }
465 }
466
467 static int perf_session_deliver_event(struct perf_session *session,
468 union perf_event *event,
469 struct perf_sample *sample,
470 struct perf_event_ops *ops,
471 u64 file_offset);
472
473 static void flush_sample_queue(struct perf_session *s,
474 struct perf_event_ops *ops)
475 {
476 struct ordered_samples *os = &s->ordered_samples;
477 struct list_head *head = &os->samples;
478 struct sample_queue *tmp, *iter;
479 struct perf_sample sample;
480 u64 limit = os->next_flush;
481 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
482
483 if (!ops->ordered_samples || !limit)
484 return;
485
486 list_for_each_entry_safe(iter, tmp, head, list) {
487 if (iter->timestamp > limit)
488 break;
489
490 perf_session__parse_sample(s, iter->event, &sample);
491 perf_session_deliver_event(s, iter->event, &sample, ops,
492 iter->file_offset);
493
494 os->last_flush = iter->timestamp;
495 list_del(&iter->list);
496 list_add(&iter->list, &os->sample_cache);
497 }
498
499 if (list_empty(head)) {
500 os->last_sample = NULL;
501 } else if (last_ts <= limit) {
502 os->last_sample =
503 list_entry(head->prev, struct sample_queue, list);
504 }
505 }
506
507 /*
508 * When perf record finishes a pass on every buffers, it records this pseudo
509 * event.
510 * We record the max timestamp t found in the pass n.
511 * Assuming these timestamps are monotonic across cpus, we know that if
512 * a buffer still has events with timestamps below t, they will be all
513 * available and then read in the pass n + 1.
514 * Hence when we start to read the pass n + 2, we can safely flush every
515 * events with timestamps below t.
516 *
517 * ============ PASS n =================
518 * CPU 0 | CPU 1
519 * |
520 * cnt1 timestamps | cnt2 timestamps
521 * 1 | 2
522 * 2 | 3
523 * - | 4 <--- max recorded
524 *
525 * ============ PASS n + 1 ==============
526 * CPU 0 | CPU 1
527 * |
528 * cnt1 timestamps | cnt2 timestamps
529 * 3 | 5
530 * 4 | 6
531 * 5 | 7 <---- max recorded
532 *
533 * Flush every events below timestamp 4
534 *
535 * ============ PASS n + 2 ==============
536 * CPU 0 | CPU 1
537 * |
538 * cnt1 timestamps | cnt2 timestamps
539 * 6 | 8
540 * 7 | 9
541 * - | 10
542 *
543 * Flush every events below timestamp 7
544 * etc...
545 */
546 static int process_finished_round(union perf_event *event __used,
547 struct perf_session *session,
548 struct perf_event_ops *ops)
549 {
550 flush_sample_queue(session, ops);
551 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
552
553 return 0;
554 }
555
556 /* The queue is ordered by time */
557 static void __queue_event(struct sample_queue *new, struct perf_session *s)
558 {
559 struct ordered_samples *os = &s->ordered_samples;
560 struct sample_queue *sample = os->last_sample;
561 u64 timestamp = new->timestamp;
562 struct list_head *p;
563
564 os->last_sample = new;
565
566 if (!sample) {
567 list_add(&new->list, &os->samples);
568 os->max_timestamp = timestamp;
569 return;
570 }
571
572 /*
573 * last_sample might point to some random place in the list as it's
574 * the last queued event. We expect that the new event is close to
575 * this.
576 */
577 if (sample->timestamp <= timestamp) {
578 while (sample->timestamp <= timestamp) {
579 p = sample->list.next;
580 if (p == &os->samples) {
581 list_add_tail(&new->list, &os->samples);
582 os->max_timestamp = timestamp;
583 return;
584 }
585 sample = list_entry(p, struct sample_queue, list);
586 }
587 list_add_tail(&new->list, &sample->list);
588 } else {
589 while (sample->timestamp > timestamp) {
590 p = sample->list.prev;
591 if (p == &os->samples) {
592 list_add(&new->list, &os->samples);
593 return;
594 }
595 sample = list_entry(p, struct sample_queue, list);
596 }
597 list_add(&new->list, &sample->list);
598 }
599 }
600
601 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue))
602
603 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
604 struct perf_sample *sample, u64 file_offset)
605 {
606 struct ordered_samples *os = &s->ordered_samples;
607 struct list_head *sc = &os->sample_cache;
608 u64 timestamp = sample->time;
609 struct sample_queue *new;
610
611 if (!timestamp || timestamp == ~0ULL)
612 return -ETIME;
613
614 if (timestamp < s->ordered_samples.last_flush) {
615 printf("Warning: Timestamp below last timeslice flush\n");
616 return -EINVAL;
617 }
618
619 if (!list_empty(sc)) {
620 new = list_entry(sc->next, struct sample_queue, list);
621 list_del(&new->list);
622 } else if (os->sample_buffer) {
623 new = os->sample_buffer + os->sample_buffer_idx;
624 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
625 os->sample_buffer = NULL;
626 } else {
627 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
628 if (!os->sample_buffer)
629 return -ENOMEM;
630 list_add(&os->sample_buffer->list, &os->to_free);
631 os->sample_buffer_idx = 2;
632 new = os->sample_buffer + 1;
633 }
634
635 new->timestamp = timestamp;
636 new->file_offset = file_offset;
637 new->event = event;
638
639 __queue_event(new, s);
640
641 return 0;
642 }
643
644 static void callchain__printf(struct perf_sample *sample)
645 {
646 unsigned int i;
647
648 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
649
650 for (i = 0; i < sample->callchain->nr; i++)
651 printf("..... %2d: %016" PRIx64 "\n",
652 i, sample->callchain->ips[i]);
653 }
654
655 static void perf_session__print_tstamp(struct perf_session *session,
656 union perf_event *event,
657 struct perf_sample *sample)
658 {
659 if (event->header.type != PERF_RECORD_SAMPLE &&
660 !session->sample_id_all) {
661 fputs("-1 -1 ", stdout);
662 return;
663 }
664
665 if ((session->sample_type & PERF_SAMPLE_CPU))
666 printf("%u ", sample->cpu);
667
668 if (session->sample_type & PERF_SAMPLE_TIME)
669 printf("%" PRIu64 " ", sample->time);
670 }
671
672 static void dump_event(struct perf_session *session, union perf_event *event,
673 u64 file_offset, struct perf_sample *sample)
674 {
675 if (!dump_trace)
676 return;
677
678 printf("\n%#" PRIx64 " [%#x]: event: %d\n",
679 file_offset, event->header.size, event->header.type);
680
681 trace_event(event);
682
683 if (sample)
684 perf_session__print_tstamp(session, event, sample);
685
686 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
687 event->header.size, perf_event__name(event->header.type));
688 }
689
690 static void dump_sample(struct perf_session *session, union perf_event *event,
691 struct perf_sample *sample)
692 {
693 if (!dump_trace)
694 return;
695
696 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n",
697 event->header.misc, sample->pid, sample->tid, sample->ip,
698 sample->period);
699
700 if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
701 callchain__printf(sample);
702 }
703
704 static int perf_session_deliver_event(struct perf_session *session,
705 union perf_event *event,
706 struct perf_sample *sample,
707 struct perf_event_ops *ops,
708 u64 file_offset)
709 {
710 struct perf_evsel *evsel;
711
712 dump_event(session, event, file_offset, sample);
713
714 switch (event->header.type) {
715 case PERF_RECORD_SAMPLE:
716 dump_sample(session, event, sample);
717 evsel = perf_evlist__id2evsel(session->evlist, sample->id);
718 if (evsel == NULL) {
719 ++session->hists.stats.nr_unknown_id;
720 return -1;
721 }
722 return ops->sample(event, sample, evsel, session);
723 case PERF_RECORD_MMAP:
724 return ops->mmap(event, sample, session);
725 case PERF_RECORD_COMM:
726 return ops->comm(event, sample, session);
727 case PERF_RECORD_FORK:
728 return ops->fork(event, sample, session);
729 case PERF_RECORD_EXIT:
730 return ops->exit(event, sample, session);
731 case PERF_RECORD_LOST:
732 return ops->lost(event, sample, session);
733 case PERF_RECORD_READ:
734 return ops->read(event, sample, session);
735 case PERF_RECORD_THROTTLE:
736 return ops->throttle(event, sample, session);
737 case PERF_RECORD_UNTHROTTLE:
738 return ops->unthrottle(event, sample, session);
739 default:
740 ++session->hists.stats.nr_unknown_events;
741 return -1;
742 }
743 }
744
745 static int perf_session__preprocess_sample(struct perf_session *session,
746 union perf_event *event, struct perf_sample *sample)
747 {
748 if (event->header.type != PERF_RECORD_SAMPLE ||
749 !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
750 return 0;
751
752 if (!ip_callchain__valid(sample->callchain, event)) {
753 pr_debug("call-chain problem with event, skipping it.\n");
754 ++session->hists.stats.nr_invalid_chains;
755 session->hists.stats.total_invalid_chains += sample->period;
756 return -EINVAL;
757 }
758 return 0;
759 }
760
761 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
762 struct perf_event_ops *ops, u64 file_offset)
763 {
764 dump_event(session, event, file_offset, NULL);
765
766 /* These events are processed right away */
767 switch (event->header.type) {
768 case PERF_RECORD_HEADER_ATTR:
769 return ops->attr(event, session);
770 case PERF_RECORD_HEADER_EVENT_TYPE:
771 return ops->event_type(event, session);
772 case PERF_RECORD_HEADER_TRACING_DATA:
773 /* setup for reading amidst mmap */
774 lseek(session->fd, file_offset, SEEK_SET);
775 return ops->tracing_data(event, session);
776 case PERF_RECORD_HEADER_BUILD_ID:
777 return ops->build_id(event, session);
778 case PERF_RECORD_FINISHED_ROUND:
779 return ops->finished_round(event, session, ops);
780 default:
781 return -EINVAL;
782 }
783 }
784
785 static int perf_session__process_event(struct perf_session *session,
786 union perf_event *event,
787 struct perf_event_ops *ops,
788 u64 file_offset)
789 {
790 struct perf_sample sample;
791 int ret;
792
793 if (session->header.needs_swap &&
794 perf_event__swap_ops[event->header.type])
795 perf_event__swap_ops[event->header.type](event);
796
797 if (event->header.type >= PERF_RECORD_HEADER_MAX)
798 return -EINVAL;
799
800 hists__inc_nr_events(&session->hists, event->header.type);
801
802 if (event->header.type >= PERF_RECORD_USER_TYPE_START)
803 return perf_session__process_user_event(session, event, ops, file_offset);
804
805 /*
806 * For all kernel events we get the sample data
807 */
808 perf_session__parse_sample(session, event, &sample);
809
810 /* Preprocess sample records - precheck callchains */
811 if (perf_session__preprocess_sample(session, event, &sample))
812 return 0;
813
814 if (ops->ordered_samples) {
815 ret = perf_session_queue_event(session, event, &sample,
816 file_offset);
817 if (ret != -ETIME)
818 return ret;
819 }
820
821 return perf_session_deliver_event(session, event, &sample, ops,
822 file_offset);
823 }
824
825 void perf_event_header__bswap(struct perf_event_header *self)
826 {
827 self->type = bswap_32(self->type);
828 self->misc = bswap_16(self->misc);
829 self->size = bswap_16(self->size);
830 }
831
832 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
833 {
834 struct thread *thread = perf_session__findnew(self, 0);
835
836 if (thread == NULL || thread__set_comm(thread, "swapper")) {
837 pr_err("problem inserting idle task.\n");
838 thread = NULL;
839 }
840
841 return thread;
842 }
843
844 static void perf_session__warn_about_errors(const struct perf_session *session,
845 const struct perf_event_ops *ops)
846 {
847 if (ops->lost == perf_event__process_lost &&
848 session->hists.stats.total_lost != 0) {
849 ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64
850 "!\n\nCheck IO/CPU overload!\n\n",
851 session->hists.stats.total_period,
852 session->hists.stats.total_lost);
853 }
854
855 if (session->hists.stats.nr_unknown_events != 0) {
856 ui__warning("Found %u unknown events!\n\n"
857 "Is this an older tool processing a perf.data "
858 "file generated by a more recent tool?\n\n"
859 "If that is not the case, consider "
860 "reporting to linux-kernel@vger.kernel.org.\n\n",
861 session->hists.stats.nr_unknown_events);
862 }
863
864 if (session->hists.stats.nr_unknown_id != 0) {
865 ui__warning("%u samples with id not present in the header\n",
866 session->hists.stats.nr_unknown_id);
867 }
868
869 if (session->hists.stats.nr_invalid_chains != 0) {
870 ui__warning("Found invalid callchains!\n\n"
871 "%u out of %u events were discarded for this reason.\n\n"
872 "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
873 session->hists.stats.nr_invalid_chains,
874 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
875 }
876 }
877
878 #define session_done() (*(volatile int *)(&session_done))
879 volatile int session_done;
880
881 static int __perf_session__process_pipe_events(struct perf_session *self,
882 struct perf_event_ops *ops)
883 {
884 union perf_event event;
885 uint32_t size;
886 int skip = 0;
887 u64 head;
888 int err;
889 void *p;
890
891 perf_event_ops__fill_defaults(ops);
892
893 head = 0;
894 more:
895 err = readn(self->fd, &event, sizeof(struct perf_event_header));
896 if (err <= 0) {
897 if (err == 0)
898 goto done;
899
900 pr_err("failed to read event header\n");
901 goto out_err;
902 }
903
904 if (self->header.needs_swap)
905 perf_event_header__bswap(&event.header);
906
907 size = event.header.size;
908 if (size == 0)
909 size = 8;
910
911 p = &event;
912 p += sizeof(struct perf_event_header);
913
914 if (size - sizeof(struct perf_event_header)) {
915 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
916 if (err <= 0) {
917 if (err == 0) {
918 pr_err("unexpected end of event stream\n");
919 goto done;
920 }
921
922 pr_err("failed to read event data\n");
923 goto out_err;
924 }
925 }
926
927 if (size == 0 ||
928 (skip = perf_session__process_event(self, &event, ops, head)) < 0) {
929 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
930 head, event.header.size, event.header.type);
931 /*
932 * assume we lost track of the stream, check alignment, and
933 * increment a single u64 in the hope to catch on again 'soon'.
934 */
935 if (unlikely(head & 7))
936 head &= ~7ULL;
937
938 size = 8;
939 }
940
941 head += size;
942
943 if (skip > 0)
944 head += skip;
945
946 if (!session_done())
947 goto more;
948 done:
949 err = 0;
950 out_err:
951 perf_session__warn_about_errors(self, ops);
952 perf_session_free_sample_buffers(self);
953 return err;
954 }
955
956 int __perf_session__process_events(struct perf_session *session,
957 u64 data_offset, u64 data_size,
958 u64 file_size, struct perf_event_ops *ops)
959 {
960 u64 head, page_offset, file_offset, file_pos, progress_next;
961 int err, mmap_prot, mmap_flags, map_idx = 0;
962 struct ui_progress *progress;
963 size_t page_size, mmap_size;
964 char *buf, *mmaps[8];
965 union perf_event *event;
966 uint32_t size;
967
968 perf_event_ops__fill_defaults(ops);
969
970 page_size = sysconf(_SC_PAGESIZE);
971
972 page_offset = page_size * (data_offset / page_size);
973 file_offset = page_offset;
974 head = data_offset - page_offset;
975
976 if (data_offset + data_size < file_size)
977 file_size = data_offset + data_size;
978
979 progress_next = file_size / 16;
980 progress = ui_progress__new("Processing events...", file_size);
981 if (progress == NULL)
982 return -1;
983
984 mmap_size = session->mmap_window;
985 if (mmap_size > file_size)
986 mmap_size = file_size;
987
988 memset(mmaps, 0, sizeof(mmaps));
989
990 mmap_prot = PROT_READ;
991 mmap_flags = MAP_SHARED;
992
993 if (session->header.needs_swap) {
994 mmap_prot |= PROT_WRITE;
995 mmap_flags = MAP_PRIVATE;
996 }
997 remap:
998 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
999 file_offset);
1000 if (buf == MAP_FAILED) {
1001 pr_err("failed to mmap file\n");
1002 err = -errno;
1003 goto out_err;
1004 }
1005 mmaps[map_idx] = buf;
1006 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1007 file_pos = file_offset + head;
1008
1009 more:
1010 event = (union perf_event *)(buf + head);
1011
1012 if (session->header.needs_swap)
1013 perf_event_header__bswap(&event->header);
1014 size = event->header.size;
1015 if (size == 0)
1016 size = 8;
1017
1018 if (head + event->header.size > mmap_size) {
1019 if (mmaps[map_idx]) {
1020 munmap(mmaps[map_idx], mmap_size);
1021 mmaps[map_idx] = NULL;
1022 }
1023
1024 page_offset = page_size * (head / page_size);
1025 file_offset += page_offset;
1026 head -= page_offset;
1027 goto remap;
1028 }
1029
1030 size = event->header.size;
1031
1032 if (size == 0 ||
1033 perf_session__process_event(session, event, ops, file_pos) < 0) {
1034 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1035 file_offset + head, event->header.size,
1036 event->header.type);
1037 /*
1038 * assume we lost track of the stream, check alignment, and
1039 * increment a single u64 in the hope to catch on again 'soon'.
1040 */
1041 if (unlikely(head & 7))
1042 head &= ~7ULL;
1043
1044 size = 8;
1045 }
1046
1047 head += size;
1048 file_pos += size;
1049
1050 if (file_pos >= progress_next) {
1051 progress_next += file_size / 16;
1052 ui_progress__update(progress, file_pos);
1053 }
1054
1055 if (file_pos < file_size)
1056 goto more;
1057
1058 err = 0;
1059 /* do the final flush for ordered samples */
1060 session->ordered_samples.next_flush = ULLONG_MAX;
1061 flush_sample_queue(session, ops);
1062 out_err:
1063 ui_progress__delete(progress);
1064 perf_session__warn_about_errors(session, ops);
1065 perf_session_free_sample_buffers(session);
1066 return err;
1067 }
1068
1069 int perf_session__process_events(struct perf_session *self,
1070 struct perf_event_ops *ops)
1071 {
1072 int err;
1073
1074 if (perf_session__register_idle_thread(self) == NULL)
1075 return -ENOMEM;
1076
1077 if (!self->fd_pipe)
1078 err = __perf_session__process_events(self,
1079 self->header.data_offset,
1080 self->header.data_size,
1081 self->size, ops);
1082 else
1083 err = __perf_session__process_pipe_events(self, ops);
1084
1085 return err;
1086 }
1087
1088 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1089 {
1090 if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1091 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1092 return false;
1093 }
1094
1095 return true;
1096 }
1097
1098 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
1099 const char *symbol_name,
1100 u64 addr)
1101 {
1102 char *bracket;
1103 enum map_type i;
1104 struct ref_reloc_sym *ref;
1105
1106 ref = zalloc(sizeof(struct ref_reloc_sym));
1107 if (ref == NULL)
1108 return -ENOMEM;
1109
1110 ref->name = strdup(symbol_name);
1111 if (ref->name == NULL) {
1112 free(ref);
1113 return -ENOMEM;
1114 }
1115
1116 bracket = strchr(ref->name, ']');
1117 if (bracket)
1118 *bracket = '\0';
1119
1120 ref->addr = addr;
1121
1122 for (i = 0; i < MAP__NR_TYPES; ++i) {
1123 struct kmap *kmap = map__kmap(maps[i]);
1124 kmap->ref_reloc_sym = ref;
1125 }
1126
1127 return 0;
1128 }
1129
1130 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1131 {
1132 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1133 __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1134 machines__fprintf_dsos(&self->machines, fp);
1135 }
1136
1137 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1138 bool with_hits)
1139 {
1140 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1141 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1142 }
1143
1144 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1145 {
1146 struct perf_evsel *pos;
1147 size_t ret = fprintf(fp, "Aggregated stats:\n");
1148
1149 ret += hists__fprintf_nr_events(&session->hists, fp);
1150
1151 list_for_each_entry(pos, &session->evlist->entries, node) {
1152 ret += fprintf(fp, "%s stats:\n", event_name(pos));
1153 ret += hists__fprintf_nr_events(&pos->hists, fp);
1154 }
1155
1156 return ret;
1157 }
1158
1159 void perf_session__print_symbols(union perf_event *event,
1160 struct perf_sample *sample,
1161 struct perf_session *session)
1162 {
1163 struct addr_location al;
1164 const char *symname, *dsoname;
1165 struct callchain_cursor *cursor = &session->callchain_cursor;
1166 struct callchain_cursor_node *node;
1167
1168 if (perf_event__preprocess_sample(event, session, &al, sample,
1169 NULL) < 0) {
1170 error("problem processing %d event, skipping it.\n",
1171 event->header.type);
1172 return;
1173 }
1174
1175 if (symbol_conf.use_callchain && sample->callchain) {
1176
1177 if (perf_session__resolve_callchain(session, al.thread,
1178 sample->callchain, NULL) != 0) {
1179 if (verbose)
1180 error("Failed to resolve callchain. Skipping\n");
1181 return;
1182 }
1183 callchain_cursor_commit(cursor);
1184
1185 while (1) {
1186 node = callchain_cursor_current(cursor);
1187 if (!node)
1188 break;
1189
1190 if (node->sym && node->sym->name)
1191 symname = node->sym->name;
1192 else
1193 symname = "";
1194
1195 if (node->map && node->map->dso && node->map->dso->name)
1196 dsoname = node->map->dso->name;
1197 else
1198 dsoname = "";
1199
1200 printf("\t%16" PRIx64 " %s (%s)\n", node->ip, symname, dsoname);
1201
1202 callchain_cursor_advance(cursor);
1203 }
1204
1205 } else {
1206 if (al.sym && al.sym->name)
1207 symname = al.sym->name;
1208 else
1209 symname = "";
1210
1211 if (al.map && al.map->dso && al.map->dso->name)
1212 dsoname = al.map->dso->name;
1213 else
1214 dsoname = "";
1215
1216 printf("%16" PRIx64 " %s (%s)", al.addr, symname, dsoname);
1217 }
1218 }
Mirror of the linux-mips.org kernel tree