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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/tools/perf/util/db-export.c
..
..
@@ -1,101 +1,39 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * db-export.c: Support for exporting data suitable for import to a database
3
4
  * Copyright (c) 2014, Intel Corporation.
4
- *
5
- * This program is free software; you can redistribute it and/or modify it
6
- * under the terms and conditions of the GNU General Public License,
7
- * version 2, as published by the Free Software Foundation.
8
- *
9
- * This program is distributed in the hope it will be useful, but WITHOUT
10
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12
- * more details.
13
- *
14
5
  */
15
6
 
16
7
 #include <errno.h>
8
+#include <stdlib.h>
17
9
 
10
+#include "dso.h"
18
11
 #include "evsel.h"
19
12
 #include "machine.h"
20
13
 #include "thread.h"
21
14
 #include "comm.h"
22
15
 #include "symbol.h"
16
+#include "map.h"
23
17
 #include "event.h"
24
-#include "util.h"
25
18
 #include "thread-stack.h"
26
19
 #include "callchain.h"
27
20
 #include "call-path.h"
28
21
 #include "db-export.h"
29
-
30
-struct deferred_export {
31
-	struct list_head node;
32
-	struct comm *comm;
33
-};
34
-
35
-static int db_export__deferred(struct db_export *dbe)
36
-{
37
-	struct deferred_export *de;
38
-	int err;
39
-
40
-	while (!list_empty(&dbe->deferred)) {
41
-		de = list_entry(dbe->deferred.next, struct deferred_export,
42
-				node);
43
-		err = dbe->export_comm(dbe, de->comm);
44
-		list_del(&de->node);
45
-		free(de);
46
-		if (err)
47
-			return err;
48
-	}
49
-
50
-	return 0;
51
-}
52
-
53
-static void db_export__free_deferred(struct db_export *dbe)
54
-{
55
-	struct deferred_export *de;
56
-
57
-	while (!list_empty(&dbe->deferred)) {
58
-		de = list_entry(dbe->deferred.next, struct deferred_export,
59
-				node);
60
-		list_del(&de->node);
61
-		free(de);
62
-	}
63
-}
64
-
65
-static int db_export__defer_comm(struct db_export *dbe, struct comm *comm)
66
-{
67
-	struct deferred_export *de;
68
-
69
-	de = zalloc(sizeof(struct deferred_export));
70
-	if (!de)
71
-		return -ENOMEM;
72
-
73
-	de->comm = comm;
74
-	list_add_tail(&de->node, &dbe->deferred);
75
-
76
-	return 0;
77
-}
22
+#include <linux/zalloc.h>
78
23
 
79
24
 int db_export__init(struct db_export *dbe)
80
25
 {
81
26
 	memset(dbe, 0, sizeof(struct db_export));
82
-	INIT_LIST_HEAD(&dbe->deferred);
83
27
 	return 0;
84
-}
85
-
86
-int db_export__flush(struct db_export *dbe)
87
-{
88
-	return db_export__deferred(dbe);
89
28
 }
90
29
 
91
30
 void db_export__exit(struct db_export *dbe)
92
31
 {
93
-	db_export__free_deferred(dbe);
94
32
 	call_return_processor__free(dbe->crp);
95
33
 	dbe->crp = NULL;
96
34
 }
97
35
 
98
-int db_export__evsel(struct db_export *dbe, struct perf_evsel *evsel)
36
+int db_export__evsel(struct db_export *dbe, struct evsel *evsel)
99
37
 {
100
38
 	if (evsel->db_id)
101
39
 		return 0;
..
..
@@ -122,71 +60,73 @@
122
60
 }
123
61
 
124
62
 int db_export__thread(struct db_export *dbe, struct thread *thread,
125
-		      struct machine *machine, struct comm *comm)
63
+		      struct machine *machine, struct thread *main_thread)
126
64
 {
127
-	struct thread *main_thread;
128
65
 	u64 main_thread_db_id = 0;
129
-	int err;
130
66
 
131
67
 	if (thread->db_id)
132
68
 		return 0;
133
69
 
134
70
 	thread->db_id = ++dbe->thread_last_db_id;
135
71
 
136
-	if (thread->pid_ != -1) {
137
-		if (thread->pid_ == thread->tid) {
138
-			main_thread = thread;
139
-		} else {
140
-			main_thread = machine__findnew_thread(machine,
141
-							      thread->pid_,
142
-							      thread->pid_);
143
-			if (!main_thread)
144
-				return -ENOMEM;
145
-			err = db_export__thread(dbe, main_thread, machine,
146
-						comm);
147
-			if (err)
148
-				goto out_put;
149
-			if (comm) {
150
-				err = db_export__comm_thread(dbe, comm, thread);
151
-				if (err)
152
-					goto out_put;
153
-			}
154
-		}
72
+	if (main_thread)
155
73
 		main_thread_db_id = main_thread->db_id;
156
-		if (main_thread != thread)
157
-			thread__put(main_thread);
158
-	}
159
74
 
160
75
 	if (dbe->export_thread)
161
76
 		return dbe->export_thread(dbe, thread, main_thread_db_id,
162
77
 					  machine);
163
78
 
164
79
 	return 0;
80
+}
165
81
 
166
-out_put:
167
-	thread__put(main_thread);
168
-	return err;
82
+static int __db_export__comm(struct db_export *dbe, struct comm *comm,
83
+			     struct thread *thread)
84
+{
85
+	comm->db_id = ++dbe->comm_last_db_id;
86
+
87
+	if (dbe->export_comm)
88
+		return dbe->export_comm(dbe, comm, thread);
89
+
90
+	return 0;
169
91
 }
170
92
 
171
93
 int db_export__comm(struct db_export *dbe, struct comm *comm,
172
-		    struct thread *main_thread)
94
+		    struct thread *thread)
95
+{
96
+	if (comm->db_id)
97
+		return 0;
98
+
99
+	return __db_export__comm(dbe, comm, thread);
100
+}
101
+
102
+/*
103
+ * Export the "exec" comm. The "exec" comm is the program / application command
104
+ * name at the time it first executes. It is used to group threads for the same
105
+ * program. Note that the main thread pid (or thread group id tgid) cannot be
106
+ * used because it does not change when a new program is exec'ed.
107
+ */
108
+int db_export__exec_comm(struct db_export *dbe, struct comm *comm,
109
+			 struct thread *main_thread)
173
110
 {
174
111
 	int err;
175
112
 
176
113
 	if (comm->db_id)
177
114
 		return 0;
178
115
 
179
-	comm->db_id = ++dbe->comm_last_db_id;
116
+	err = __db_export__comm(dbe, comm, main_thread);
117
+	if (err)
118
+		return err;
180
119
 
181
-	if (dbe->export_comm) {
182
-		if (main_thread->comm_set)
183
-			err = dbe->export_comm(dbe, comm);
184
-		else
185
-			err = db_export__defer_comm(dbe, comm);
186
-		if (err)
187
-			return err;
188
-	}
189
-
120
+	/*
121
+	 * Record the main thread for this comm. Note that the main thread can
122
+	 * have many "exec" comms because there will be a new one every time it
123
+	 * exec's. An "exec" comm however will only ever have 1 main thread.
124
+	 * That is different to any other threads for that same program because
125
+	 * exec() will effectively kill them, so the relationship between the
126
+	 * "exec" comm and non-main threads is 1-to-1. That is why
127
+	 * db_export__comm_thread() is called here for the main thread, but it
128
+	 * is called for non-main threads when they are exported.
129
+	 */
190
130
 	return db_export__comm_thread(dbe, comm, main_thread);
191
131
 }
192
132
 
..
..
@@ -241,7 +181,7 @@
241
181
 	if (al->map) {
242
182
 		struct dso *dso = al->map->dso;
243
183
 
244
-		err = db_export__dso(dbe, dso, al->machine);
184
+		err = db_export__dso(dbe, dso, al->maps->machine);
245
185
 		if (err)
246
186
 			return err;
247
187
 		*dso_db_id = dso->db_id;
..
..
@@ -270,7 +210,7 @@
270
210
 					       struct machine *machine,
271
211
 					       struct thread *thread,
272
212
 					       struct perf_sample *sample,
273
-					       struct perf_evsel *evsel)
213
+					       struct evsel *evsel)
274
214
 {
275
215
 	u64 kernel_start = machine__kernel_start(machine);
276
216
 	struct call_path *current = &dbe->cpr->call_path;
..
..
@@ -309,9 +249,9 @@
309
249
 		 * constructing an addr_location struct and then passing it to
310
250
 		 * db_ids_from_al() to perform the export.
311
251
 		 */
312
-		al.sym = node->sym;
313
-		al.map = node->map;
314
-		al.machine = machine;
252
+		al.sym = node->ms.sym;
253
+		al.map = node->ms.map;
254
+		al.maps = thread->maps;
315
255
 		al.addr = node->ip;
316
256
 
317
257
 		if (al.map && !al.sym)
..
..
@@ -347,11 +287,65 @@
347
287
 	return 0;
348
288
 }
349
289
 
290
+static int db_export__threads(struct db_export *dbe, struct thread *thread,
291
+			      struct thread *main_thread,
292
+			      struct machine *machine, struct comm **comm_ptr)
293
+{
294
+	struct comm *comm = NULL;
295
+	struct comm *curr_comm;
296
+	int err;
297
+
298
+	if (main_thread) {
299
+		/*
300
+		 * A thread has a reference to the main thread, so export the
301
+		 * main thread first.
302
+		 */
303
+		err = db_export__thread(dbe, main_thread, machine, main_thread);
304
+		if (err)
305
+			return err;
306
+		/*
307
+		 * Export comm before exporting the non-main thread because
308
+		 * db_export__comm_thread() can be called further below.
309
+		 */
310
+		comm = machine__thread_exec_comm(machine, main_thread);
311
+		if (comm) {
312
+			err = db_export__exec_comm(dbe, comm, main_thread);
313
+			if (err)
314
+				return err;
315
+			*comm_ptr = comm;
316
+		}
317
+	}
318
+
319
+	if (thread != main_thread) {
320
+		/*
321
+		 * For a non-main thread, db_export__comm_thread() must be
322
+		 * called only if thread has not previously been exported.
323
+		 */
324
+		bool export_comm_thread = comm && !thread->db_id;
325
+
326
+		err = db_export__thread(dbe, thread, machine, main_thread);
327
+		if (err)
328
+			return err;
329
+
330
+		if (export_comm_thread) {
331
+			err = db_export__comm_thread(dbe, comm, thread);
332
+			if (err)
333
+				return err;
334
+		}
335
+	}
336
+
337
+	curr_comm = thread__comm(thread);
338
+	if (curr_comm)
339
+		return db_export__comm(dbe, curr_comm, thread);
340
+
341
+	return 0;
342
+}
343
+
350
344
 int db_export__sample(struct db_export *dbe, union perf_event *event,
351
-		      struct perf_sample *sample, struct perf_evsel *evsel,
345
+		      struct perf_sample *sample, struct evsel *evsel,
352
346
 		      struct addr_location *al)
353
347
 {
354
-	struct thread* thread = al->thread;
348
+	struct thread *thread = al->thread;
355
349
 	struct export_sample es = {
356
350
 		.event = event,
357
351
 		.sample = sample,
..
..
@@ -366,24 +360,18 @@
366
360
 	if (err)
367
361
 		return err;
368
362
 
369
-	err = db_export__machine(dbe, al->machine);
363
+	err = db_export__machine(dbe, al->maps->machine);
370
364
 	if (err)
371
365
 		return err;
372
366
 
373
-	main_thread = thread__main_thread(al->machine, thread);
374
-	if (main_thread)
375
-		comm = machine__thread_exec_comm(al->machine, main_thread);
367
+	main_thread = thread__main_thread(al->maps->machine, thread);
376
368
 
377
-	err = db_export__thread(dbe, thread, al->machine, comm);
369
+	err = db_export__threads(dbe, thread, main_thread, al->maps->machine, &comm);
378
370
 	if (err)
379
371
 		goto out_put;
380
372
 
381
-	if (comm) {
382
-		err = db_export__comm(dbe, comm, main_thread);
383
-		if (err)
384
-			goto out_put;
373
+	if (comm)
385
374
 		es.comm_db_id = comm->db_id;
386
-	}
387
375
 
388
376
 	es.db_id = ++dbe->sample_last_db_id;
389
377
 
..
..
@@ -392,7 +380,7 @@
392
380
 		goto out_put;
393
381
 
394
382
 	if (dbe->cpr) {
395
-		struct call_path *cp = call_path_from_sample(dbe, al->machine,
383
+		struct call_path *cp = call_path_from_sample(dbe, al->maps->machine,
396
384
 							     thread, sample,
397
385
 							     evsel);
398
386
 		if (cp) {
..
..
@@ -401,8 +389,8 @@
401
389
 		}
402
390
 	}
403
391
 
404
-	if ((evsel->attr.sample_type & PERF_SAMPLE_ADDR) &&
405
-	    sample_addr_correlates_sym(&evsel->attr)) {
392
+	if ((evsel->core.attr.sample_type & PERF_SAMPLE_ADDR) &&
393
+	    sample_addr_correlates_sym(&evsel->core.attr)) {
406
394
 		struct addr_location addr_al;
407
395
 
408
396
 		thread__resolve(thread, &addr_al, sample);
..
..
@@ -463,6 +451,28 @@
463
451
 		if (err)
464
452
 			break;
465
453
 	}
454
+
455
+	/* Add trace begin / end variants */
456
+	for (i = 0; branch_types[i].name ; i++) {
457
+		const char *name = branch_types[i].name;
458
+		u32 type = branch_types[i].branch_type;
459
+		char buf[64];
460
+
461
+		if (type == PERF_IP_FLAG_BRANCH ||
462
+		    (type & (PERF_IP_FLAG_TRACE_BEGIN | PERF_IP_FLAG_TRACE_END)))
463
+			continue;
464
+
465
+		snprintf(buf, sizeof(buf), "trace begin / %s", name);
466
+		err = db_export__branch_type(dbe, type | PERF_IP_FLAG_TRACE_BEGIN, buf);
467
+		if (err)
468
+			break;
469
+
470
+		snprintf(buf, sizeof(buf), "%s / trace end", name);
471
+		err = db_export__branch_type(dbe, type | PERF_IP_FLAG_TRACE_END, buf);
472
+		if (err)
473
+			break;
474
+	}
475
+
466
476
 	return err;
467
477
 }
468
478
 
..
..
@@ -487,21 +497,115 @@
487
497
 	return 0;
488
498
 }
489
499
 
490
-int db_export__call_return(struct db_export *dbe, struct call_return *cr)
500
+int db_export__call_return(struct db_export *dbe, struct call_return *cr,
501
+			   u64 *parent_db_id)
491
502
 {
492
503
 	int err;
493
-
494
-	if (cr->db_id)
495
-		return 0;
496
504
 
497
505
 	err = db_export__call_path(dbe, cr->cp);
498
506
 	if (err)
499
507
 		return err;
500
508
 
501
-	cr->db_id = ++dbe->call_return_last_db_id;
509
+	if (!cr->db_id)
510
+		cr->db_id = ++dbe->call_return_last_db_id;
511
+
512
+	if (parent_db_id) {
513
+		if (!*parent_db_id)
514
+			*parent_db_id = ++dbe->call_return_last_db_id;
515
+		cr->parent_db_id = *parent_db_id;
516
+	}
502
517
 
503
518
 	if (dbe->export_call_return)
504
519
 		return dbe->export_call_return(dbe, cr);
505
520
 
506
521
 	return 0;
507
522
 }
523
+
524
+static int db_export__pid_tid(struct db_export *dbe, struct machine *machine,
525
+			      pid_t pid, pid_t tid, u64 *db_id,
526
+			      struct comm **comm_ptr, bool *is_idle)
527
+{
528
+	struct thread *thread = machine__find_thread(machine, pid, tid);
529
+	struct thread *main_thread;
530
+	int err = 0;
531
+
532
+	if (!thread || !thread->comm_set)
533
+		goto out_put;
534
+
535
+	*is_idle = !thread->pid_ && !thread->tid;
536
+
537
+	main_thread = thread__main_thread(machine, thread);
538
+
539
+	err = db_export__threads(dbe, thread, main_thread, machine, comm_ptr);
540
+
541
+	*db_id = thread->db_id;
542
+
543
+	thread__put(main_thread);
544
+out_put:
545
+	thread__put(thread);
546
+
547
+	return err;
548
+}
549
+
550
+int db_export__switch(struct db_export *dbe, union perf_event *event,
551
+		      struct perf_sample *sample, struct machine *machine)
552
+{
553
+	bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
554
+	bool out_preempt = out &&
555
+		(event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT);
556
+	int flags = out | (out_preempt << 1);
557
+	bool is_idle_a = false, is_idle_b = false;
558
+	u64 th_a_id = 0, th_b_id = 0;
559
+	u64 comm_out_id, comm_in_id;
560
+	struct comm *comm_a = NULL;
561
+	struct comm *comm_b = NULL;
562
+	u64 th_out_id, th_in_id;
563
+	u64 db_id;
564
+	int err;
565
+
566
+	err = db_export__machine(dbe, machine);
567
+	if (err)
568
+		return err;
569
+
570
+	err = db_export__pid_tid(dbe, machine, sample->pid, sample->tid,
571
+				 &th_a_id, &comm_a, &is_idle_a);
572
+	if (err)
573
+		return err;
574
+
575
+	if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) {
576
+		pid_t pid = event->context_switch.next_prev_pid;
577
+		pid_t tid = event->context_switch.next_prev_tid;
578
+
579
+		err = db_export__pid_tid(dbe, machine, pid, tid, &th_b_id,
580
+					 &comm_b, &is_idle_b);
581
+		if (err)
582
+			return err;
583
+	}
584
+
585
+	/*
586
+	 * Do not export if both threads are unknown (i.e. not being traced),
587
+	 * or one is unknown and the other is the idle task.
588
+	 */
589
+	if ((!th_a_id || is_idle_a) && (!th_b_id || is_idle_b))
590
+		return 0;
591
+
592
+	db_id = ++dbe->context_switch_last_db_id;
593
+
594
+	if (out) {
595
+		th_out_id   = th_a_id;
596
+		th_in_id    = th_b_id;
597
+		comm_out_id = comm_a ? comm_a->db_id : 0;
598
+		comm_in_id  = comm_b ? comm_b->db_id : 0;
599
+	} else {
600
+		th_out_id   = th_b_id;
601
+		th_in_id    = th_a_id;
602
+		comm_out_id = comm_b ? comm_b->db_id : 0;
603
+		comm_in_id  = comm_a ? comm_a->db_id : 0;
604
+	}
605
+
606
+	if (dbe->export_context_switch)
607
+		return dbe->export_context_switch(dbe, db_id, machine, sample,
608
+						  th_out_id, comm_out_id,
609
+						  th_in_id, comm_in_id, flags);
610
+	return 0;
611
+}