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1// SPDX-License-Identifier: GPL-2.0
2#include <sys/time.h>
3#include <sys/prctl.h>
4#include <errno.h>
5#include <time.h>
6#include <stdlib.h>
7
8#include "parse-events.h"
9#include "evlist.h"
10#include "evsel.h"
11#include "thread_map.h"
12#include "cpumap.h"
13#include "tests.h"
14
15static int spin_sleep(void)
16{
17 struct timeval start, now, diff, maxtime;
18 struct timespec ts;
19 int err, i;
20
21 maxtime.tv_sec = 0;
22 maxtime.tv_usec = 50000;
23
24 err = gettimeofday(&start, NULL);
25 if (err)
26 return err;
27
28 /* Spin for 50ms */
29 while (1) {
30 for (i = 0; i < 1000; i++)
31 barrier();
32
33 err = gettimeofday(&now, NULL);
34 if (err)
35 return err;
36
37 timersub(&now, &start, &diff);
38 if (timercmp(&diff, &maxtime, > /* For checkpatch */))
39 break;
40 }
41
42 ts.tv_nsec = 50 * 1000 * 1000;
43 ts.tv_sec = 0;
44
45 /* Sleep for 50ms */
46 err = nanosleep(&ts, NULL);
47 if (err == EINTR)
48 err = 0;
49
50 return err;
51}
52
53struct switch_tracking {
54 struct perf_evsel *switch_evsel;
55 struct perf_evsel *cycles_evsel;
56 pid_t *tids;
57 int nr_tids;
58 int comm_seen[4];
59 int cycles_before_comm_1;
60 int cycles_between_comm_2_and_comm_3;
61 int cycles_after_comm_4;
62};
63
64static int check_comm(struct switch_tracking *switch_tracking,
65 union perf_event *event, const char *comm, int nr)
66{
67 if (event->header.type == PERF_RECORD_COMM &&
68 (pid_t)event->comm.pid == getpid() &&
69 (pid_t)event->comm.tid == getpid() &&
70 strcmp(event->comm.comm, comm) == 0) {
71 if (switch_tracking->comm_seen[nr]) {
72 pr_debug("Duplicate comm event\n");
73 return -1;
74 }
75 switch_tracking->comm_seen[nr] = 1;
76 pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
77 return 1;
78 }
79 return 0;
80}
81
82static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
83{
84 int i, nr = cpu + 1;
85
86 if (cpu < 0)
87 return -1;
88
89 if (!switch_tracking->tids) {
90 switch_tracking->tids = calloc(nr, sizeof(pid_t));
91 if (!switch_tracking->tids)
92 return -1;
93 for (i = 0; i < nr; i++)
94 switch_tracking->tids[i] = -1;
95 switch_tracking->nr_tids = nr;
96 return 0;
97 }
98
99 if (cpu >= switch_tracking->nr_tids) {
100 void *addr;
101
102 addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
103 if (!addr)
104 return -1;
105 switch_tracking->tids = addr;
106 for (i = switch_tracking->nr_tids; i < nr; i++)
107 switch_tracking->tids[i] = -1;
108 switch_tracking->nr_tids = nr;
109 return 0;
110 }
111
112 return 0;
113}
114
115static int process_sample_event(struct perf_evlist *evlist,
116 union perf_event *event,
117 struct switch_tracking *switch_tracking)
118{
119 struct perf_sample sample;
120 struct perf_evsel *evsel;
121 pid_t next_tid, prev_tid;
122 int cpu, err;
123
124 if (perf_evlist__parse_sample(evlist, event, &sample)) {
125 pr_debug("perf_evlist__parse_sample failed\n");
126 return -1;
127 }
128
129 evsel = perf_evlist__id2evsel(evlist, sample.id);
130 if (evsel == switch_tracking->switch_evsel) {
131 next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
132 prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
133 cpu = sample.cpu;
134 pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
135 cpu, prev_tid, next_tid);
136 err = check_cpu(switch_tracking, cpu);
137 if (err)
138 return err;
139 /*
140 * Check for no missing sched_switch events i.e. that the
141 * evsel->system_wide flag has worked.
142 */
143 if (switch_tracking->tids[cpu] != -1 &&
144 switch_tracking->tids[cpu] != prev_tid) {
145 pr_debug("Missing sched_switch events\n");
146 return -1;
147 }
148 switch_tracking->tids[cpu] = next_tid;
149 }
150
151 if (evsel == switch_tracking->cycles_evsel) {
152 pr_debug3("cycles event\n");
153 if (!switch_tracking->comm_seen[0])
154 switch_tracking->cycles_before_comm_1 = 1;
155 if (switch_tracking->comm_seen[1] &&
156 !switch_tracking->comm_seen[2])
157 switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
158 if (switch_tracking->comm_seen[3])
159 switch_tracking->cycles_after_comm_4 = 1;
160 }
161
162 return 0;
163}
164
165static int process_event(struct perf_evlist *evlist, union perf_event *event,
166 struct switch_tracking *switch_tracking)
167{
168 if (event->header.type == PERF_RECORD_SAMPLE)
169 return process_sample_event(evlist, event, switch_tracking);
170
171 if (event->header.type == PERF_RECORD_COMM) {
172 int err, done = 0;
173
174 err = check_comm(switch_tracking, event, "Test COMM 1", 0);
175 if (err < 0)
176 return -1;
177 done += err;
178 err = check_comm(switch_tracking, event, "Test COMM 2", 1);
179 if (err < 0)
180 return -1;
181 done += err;
182 err = check_comm(switch_tracking, event, "Test COMM 3", 2);
183 if (err < 0)
184 return -1;
185 done += err;
186 err = check_comm(switch_tracking, event, "Test COMM 4", 3);
187 if (err < 0)
188 return -1;
189 done += err;
190 if (done != 1) {
191 pr_debug("Unexpected comm event\n");
192 return -1;
193 }
194 }
195
196 return 0;
197}
198
199struct event_node {
200 struct list_head list;
201 union perf_event *event;
202 u64 event_time;
203};
204
205static int add_event(struct perf_evlist *evlist, struct list_head *events,
206 union perf_event *event)
207{
208 struct perf_sample sample;
209 struct event_node *node;
210
211 node = malloc(sizeof(struct event_node));
212 if (!node) {
213 pr_debug("malloc failed\n");
214 return -1;
215 }
216 node->event = event;
217 list_add(&node->list, events);
218
219 if (perf_evlist__parse_sample(evlist, event, &sample)) {
220 pr_debug("perf_evlist__parse_sample failed\n");
221 return -1;
222 }
223
224 if (!sample.time) {
225 pr_debug("event with no time\n");
226 return -1;
227 }
228
229 node->event_time = sample.time;
230
231 return 0;
232}
233
234static void free_event_nodes(struct list_head *events)
235{
236 struct event_node *node;
237
238 while (!list_empty(events)) {
239 node = list_entry(events->next, struct event_node, list);
240 list_del(&node->list);
241 free(node);
242 }
243}
244
245static int compar(const void *a, const void *b)
246{
247 const struct event_node *nodea = a;
248 const struct event_node *nodeb = b;
249 s64 cmp = nodea->event_time - nodeb->event_time;
250
251 return cmp;
252}
253
254static int process_events(struct perf_evlist *evlist,
255 struct switch_tracking *switch_tracking)
256{
257 union perf_event *event;
258 unsigned pos, cnt = 0;
259 LIST_HEAD(events);
260 struct event_node *events_array, *node;
261 struct perf_mmap *md;
262 int i, ret;
263
264 for (i = 0; i < evlist->nr_mmaps; i++) {
265 md = &evlist->mmap[i];
266 if (perf_mmap__read_init(md) < 0)
267 continue;
268
269 while ((event = perf_mmap__read_event(md)) != NULL) {
270 cnt += 1;
271 ret = add_event(evlist, &events, event);
272 perf_mmap__consume(md);
273 if (ret < 0)
274 goto out_free_nodes;
275 }
276 perf_mmap__read_done(md);
277 }
278
279 events_array = calloc(cnt, sizeof(struct event_node));
280 if (!events_array) {
281 pr_debug("calloc failed\n");
282 ret = -1;
283 goto out_free_nodes;
284 }
285
286 pos = 0;
287 list_for_each_entry(node, &events, list)
288 events_array[pos++] = *node;
289
290 qsort(events_array, cnt, sizeof(struct event_node), compar);
291
292 for (pos = 0; pos < cnt; pos++) {
293 ret = process_event(evlist, events_array[pos].event,
294 switch_tracking);
295 if (ret < 0)
296 goto out_free;
297 }
298
299 ret = 0;
300out_free:
301 pr_debug("%u events recorded\n", cnt);
302 free(events_array);
303out_free_nodes:
304 free_event_nodes(&events);
305 return ret;
306}
307
308/**
309 * test__switch_tracking - test using sched_switch and tracking events.
310 *
311 * This function implements a test that checks that sched_switch events and
312 * tracking events can be recorded for a workload (current process) using the
313 * evsel->system_wide and evsel->tracking flags (respectively) with other events
314 * sometimes enabled or disabled.
315 */
316int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
317{
318 const char *sched_switch = "sched:sched_switch";
319 struct switch_tracking switch_tracking = { .tids = NULL, };
320 struct record_opts opts = {
321 .mmap_pages = UINT_MAX,
322 .user_freq = UINT_MAX,
323 .user_interval = ULLONG_MAX,
324 .freq = 4000,
325 .target = {
326 .uses_mmap = true,
327 },
328 };
329 struct thread_map *threads = NULL;
330 struct cpu_map *cpus = NULL;
331 struct perf_evlist *evlist = NULL;
332 struct perf_evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
333 struct perf_evsel *switch_evsel, *tracking_evsel;
334 const char *comm;
335 int err = -1;
336
337 threads = thread_map__new(-1, getpid(), UINT_MAX);
338 if (!threads) {
339 pr_debug("thread_map__new failed!\n");
340 goto out_err;
341 }
342
343 cpus = cpu_map__new(NULL);
344 if (!cpus) {
345 pr_debug("cpu_map__new failed!\n");
346 goto out_err;
347 }
348
349 evlist = perf_evlist__new();
350 if (!evlist) {
351 pr_debug("perf_evlist__new failed!\n");
352 goto out_err;
353 }
354
355 perf_evlist__set_maps(evlist, cpus, threads);
356
357 /* First event */
358 err = parse_events(evlist, "cpu-clock:u", NULL);
359 if (err) {
360 pr_debug("Failed to parse event dummy:u\n");
361 goto out_err;
362 }
363
364 cpu_clocks_evsel = perf_evlist__last(evlist);
365
366 /* Second event */
367 err = parse_events(evlist, "cycles:u", NULL);
368 if (err) {
369 pr_debug("Failed to parse event cycles:u\n");
370 goto out_err;
371 }
372
373 cycles_evsel = perf_evlist__last(evlist);
374
375 /* Third event */
376 if (!perf_evlist__can_select_event(evlist, sched_switch)) {
377 pr_debug("No sched_switch\n");
378 err = 0;
379 goto out;
380 }
381
382 err = parse_events(evlist, sched_switch, NULL);
383 if (err) {
384 pr_debug("Failed to parse event %s\n", sched_switch);
385 goto out_err;
386 }
387
388 switch_evsel = perf_evlist__last(evlist);
389
390 perf_evsel__set_sample_bit(switch_evsel, CPU);
391 perf_evsel__set_sample_bit(switch_evsel, TIME);
392
393 switch_evsel->system_wide = true;
394 switch_evsel->no_aux_samples = true;
395 switch_evsel->immediate = true;
396
397 /* Test moving an event to the front */
398 if (cycles_evsel == perf_evlist__first(evlist)) {
399 pr_debug("cycles event already at front");
400 goto out_err;
401 }
402 perf_evlist__to_front(evlist, cycles_evsel);
403 if (cycles_evsel != perf_evlist__first(evlist)) {
404 pr_debug("Failed to move cycles event to front");
405 goto out_err;
406 }
407
408 perf_evsel__set_sample_bit(cycles_evsel, CPU);
409 perf_evsel__set_sample_bit(cycles_evsel, TIME);
410
411 /* Fourth event */
412 err = parse_events(evlist, "dummy:u", NULL);
413 if (err) {
414 pr_debug("Failed to parse event dummy:u\n");
415 goto out_err;
416 }
417
418 tracking_evsel = perf_evlist__last(evlist);
419
420 perf_evlist__set_tracking_event(evlist, tracking_evsel);
421
422 tracking_evsel->attr.freq = 0;
423 tracking_evsel->attr.sample_period = 1;
424
425 perf_evsel__set_sample_bit(tracking_evsel, TIME);
426
427 /* Config events */
428 perf_evlist__config(evlist, &opts, NULL);
429
430 /* Check moved event is still at the front */
431 if (cycles_evsel != perf_evlist__first(evlist)) {
432 pr_debug("Front event no longer at front");
433 goto out_err;
434 }
435
436 /* Check tracking event is tracking */
437 if (!tracking_evsel->attr.mmap || !tracking_evsel->attr.comm) {
438 pr_debug("Tracking event not tracking\n");
439 goto out_err;
440 }
441
442 /* Check non-tracking events are not tracking */
443 evlist__for_each_entry(evlist, evsel) {
444 if (evsel != tracking_evsel) {
445 if (evsel->attr.mmap || evsel->attr.comm) {
446 pr_debug("Non-tracking event is tracking\n");
447 goto out_err;
448 }
449 }
450 }
451
452 if (perf_evlist__open(evlist) < 0) {
453 pr_debug("Not supported\n");
454 err = 0;
455 goto out;
456 }
457
458 err = perf_evlist__mmap(evlist, UINT_MAX);
459 if (err) {
460 pr_debug("perf_evlist__mmap failed!\n");
461 goto out_err;
462 }
463
464 perf_evlist__enable(evlist);
465
466 err = perf_evsel__disable(cpu_clocks_evsel);
467 if (err) {
468 pr_debug("perf_evlist__disable_event failed!\n");
469 goto out_err;
470 }
471
472 err = spin_sleep();
473 if (err) {
474 pr_debug("spin_sleep failed!\n");
475 goto out_err;
476 }
477
478 comm = "Test COMM 1";
479 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
480 if (err) {
481 pr_debug("PR_SET_NAME failed!\n");
482 goto out_err;
483 }
484
485 err = perf_evsel__disable(cycles_evsel);
486 if (err) {
487 pr_debug("perf_evlist__disable_event failed!\n");
488 goto out_err;
489 }
490
491 comm = "Test COMM 2";
492 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
493 if (err) {
494 pr_debug("PR_SET_NAME failed!\n");
495 goto out_err;
496 }
497
498 err = spin_sleep();
499 if (err) {
500 pr_debug("spin_sleep failed!\n");
501 goto out_err;
502 }
503
504 comm = "Test COMM 3";
505 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
506 if (err) {
507 pr_debug("PR_SET_NAME failed!\n");
508 goto out_err;
509 }
510
511 err = perf_evsel__enable(cycles_evsel);
512 if (err) {
513 pr_debug("perf_evlist__disable_event failed!\n");
514 goto out_err;
515 }
516
517 comm = "Test COMM 4";
518 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
519 if (err) {
520 pr_debug("PR_SET_NAME failed!\n");
521 goto out_err;
522 }
523
524 err = spin_sleep();
525 if (err) {
526 pr_debug("spin_sleep failed!\n");
527 goto out_err;
528 }
529
530 perf_evlist__disable(evlist);
531
532 switch_tracking.switch_evsel = switch_evsel;
533 switch_tracking.cycles_evsel = cycles_evsel;
534
535 err = process_events(evlist, &switch_tracking);
536
537 zfree(&switch_tracking.tids);
538
539 if (err)
540 goto out_err;
541
542 /* Check all 4 comm events were seen i.e. that evsel->tracking works */
543 if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
544 !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
545 pr_debug("Missing comm events\n");
546 goto out_err;
547 }
548
549 /* Check cycles event got enabled */
550 if (!switch_tracking.cycles_before_comm_1) {
551 pr_debug("Missing cycles events\n");
552 goto out_err;
553 }
554
555 /* Check cycles event got disabled */
556 if (switch_tracking.cycles_between_comm_2_and_comm_3) {
557 pr_debug("cycles events even though event was disabled\n");
558 goto out_err;
559 }
560
561 /* Check cycles event got enabled again */
562 if (!switch_tracking.cycles_after_comm_4) {
563 pr_debug("Missing cycles events\n");
564 goto out_err;
565 }
566out:
567 if (evlist) {
568 perf_evlist__disable(evlist);
569 perf_evlist__delete(evlist);
570 } else {
571 cpu_map__put(cpus);
572 thread_map__put(threads);
573 }
574
575 return err;
576
577out_err:
578 err = -1;
579 goto out;
580}
1#include <sys/time.h>
2#include <sys/prctl.h>
3#include <time.h>
4#include <stdlib.h>
5
6#include "parse-events.h"
7#include "evlist.h"
8#include "evsel.h"
9#include "thread_map.h"
10#include "cpumap.h"
11#include "tests.h"
12
13static int spin_sleep(void)
14{
15 struct timeval start, now, diff, maxtime;
16 struct timespec ts;
17 int err, i;
18
19 maxtime.tv_sec = 0;
20 maxtime.tv_usec = 50000;
21
22 err = gettimeofday(&start, NULL);
23 if (err)
24 return err;
25
26 /* Spin for 50ms */
27 while (1) {
28 for (i = 0; i < 1000; i++)
29 barrier();
30
31 err = gettimeofday(&now, NULL);
32 if (err)
33 return err;
34
35 timersub(&now, &start, &diff);
36 if (timercmp(&diff, &maxtime, > /* For checkpatch */))
37 break;
38 }
39
40 ts.tv_nsec = 50 * 1000 * 1000;
41 ts.tv_sec = 0;
42
43 /* Sleep for 50ms */
44 err = nanosleep(&ts, NULL);
45 if (err == EINTR)
46 err = 0;
47
48 return err;
49}
50
51struct switch_tracking {
52 struct perf_evsel *switch_evsel;
53 struct perf_evsel *cycles_evsel;
54 pid_t *tids;
55 int nr_tids;
56 int comm_seen[4];
57 int cycles_before_comm_1;
58 int cycles_between_comm_2_and_comm_3;
59 int cycles_after_comm_4;
60};
61
62static int check_comm(struct switch_tracking *switch_tracking,
63 union perf_event *event, const char *comm, int nr)
64{
65 if (event->header.type == PERF_RECORD_COMM &&
66 (pid_t)event->comm.pid == getpid() &&
67 (pid_t)event->comm.tid == getpid() &&
68 strcmp(event->comm.comm, comm) == 0) {
69 if (switch_tracking->comm_seen[nr]) {
70 pr_debug("Duplicate comm event\n");
71 return -1;
72 }
73 switch_tracking->comm_seen[nr] = 1;
74 pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
75 return 1;
76 }
77 return 0;
78}
79
80static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
81{
82 int i, nr = cpu + 1;
83
84 if (cpu < 0)
85 return -1;
86
87 if (!switch_tracking->tids) {
88 switch_tracking->tids = calloc(nr, sizeof(pid_t));
89 if (!switch_tracking->tids)
90 return -1;
91 for (i = 0; i < nr; i++)
92 switch_tracking->tids[i] = -1;
93 switch_tracking->nr_tids = nr;
94 return 0;
95 }
96
97 if (cpu >= switch_tracking->nr_tids) {
98 void *addr;
99
100 addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
101 if (!addr)
102 return -1;
103 switch_tracking->tids = addr;
104 for (i = switch_tracking->nr_tids; i < nr; i++)
105 switch_tracking->tids[i] = -1;
106 switch_tracking->nr_tids = nr;
107 return 0;
108 }
109
110 return 0;
111}
112
113static int process_sample_event(struct perf_evlist *evlist,
114 union perf_event *event,
115 struct switch_tracking *switch_tracking)
116{
117 struct perf_sample sample;
118 struct perf_evsel *evsel;
119 pid_t next_tid, prev_tid;
120 int cpu, err;
121
122 if (perf_evlist__parse_sample(evlist, event, &sample)) {
123 pr_debug("perf_evlist__parse_sample failed\n");
124 return -1;
125 }
126
127 evsel = perf_evlist__id2evsel(evlist, sample.id);
128 if (evsel == switch_tracking->switch_evsel) {
129 next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
130 prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
131 cpu = sample.cpu;
132 pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
133 cpu, prev_tid, next_tid);
134 err = check_cpu(switch_tracking, cpu);
135 if (err)
136 return err;
137 /*
138 * Check for no missing sched_switch events i.e. that the
139 * evsel->system_wide flag has worked.
140 */
141 if (switch_tracking->tids[cpu] != -1 &&
142 switch_tracking->tids[cpu] != prev_tid) {
143 pr_debug("Missing sched_switch events\n");
144 return -1;
145 }
146 switch_tracking->tids[cpu] = next_tid;
147 }
148
149 if (evsel == switch_tracking->cycles_evsel) {
150 pr_debug3("cycles event\n");
151 if (!switch_tracking->comm_seen[0])
152 switch_tracking->cycles_before_comm_1 = 1;
153 if (switch_tracking->comm_seen[1] &&
154 !switch_tracking->comm_seen[2])
155 switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
156 if (switch_tracking->comm_seen[3])
157 switch_tracking->cycles_after_comm_4 = 1;
158 }
159
160 return 0;
161}
162
163static int process_event(struct perf_evlist *evlist, union perf_event *event,
164 struct switch_tracking *switch_tracking)
165{
166 if (event->header.type == PERF_RECORD_SAMPLE)
167 return process_sample_event(evlist, event, switch_tracking);
168
169 if (event->header.type == PERF_RECORD_COMM) {
170 int err, done = 0;
171
172 err = check_comm(switch_tracking, event, "Test COMM 1", 0);
173 if (err < 0)
174 return -1;
175 done += err;
176 err = check_comm(switch_tracking, event, "Test COMM 2", 1);
177 if (err < 0)
178 return -1;
179 done += err;
180 err = check_comm(switch_tracking, event, "Test COMM 3", 2);
181 if (err < 0)
182 return -1;
183 done += err;
184 err = check_comm(switch_tracking, event, "Test COMM 4", 3);
185 if (err < 0)
186 return -1;
187 done += err;
188 if (done != 1) {
189 pr_debug("Unexpected comm event\n");
190 return -1;
191 }
192 }
193
194 return 0;
195}
196
197struct event_node {
198 struct list_head list;
199 union perf_event *event;
200 u64 event_time;
201};
202
203static int add_event(struct perf_evlist *evlist, struct list_head *events,
204 union perf_event *event)
205{
206 struct perf_sample sample;
207 struct event_node *node;
208
209 node = malloc(sizeof(struct event_node));
210 if (!node) {
211 pr_debug("malloc failed\n");
212 return -1;
213 }
214 node->event = event;
215 list_add(&node->list, events);
216
217 if (perf_evlist__parse_sample(evlist, event, &sample)) {
218 pr_debug("perf_evlist__parse_sample failed\n");
219 return -1;
220 }
221
222 if (!sample.time) {
223 pr_debug("event with no time\n");
224 return -1;
225 }
226
227 node->event_time = sample.time;
228
229 return 0;
230}
231
232static void free_event_nodes(struct list_head *events)
233{
234 struct event_node *node;
235
236 while (!list_empty(events)) {
237 node = list_entry(events->next, struct event_node, list);
238 list_del(&node->list);
239 free(node);
240 }
241}
242
243static int compar(const void *a, const void *b)
244{
245 const struct event_node *nodea = a;
246 const struct event_node *nodeb = b;
247 s64 cmp = nodea->event_time - nodeb->event_time;
248
249 return cmp;
250}
251
252static int process_events(struct perf_evlist *evlist,
253 struct switch_tracking *switch_tracking)
254{
255 union perf_event *event;
256 unsigned pos, cnt = 0;
257 LIST_HEAD(events);
258 struct event_node *events_array, *node;
259 int i, ret;
260
261 for (i = 0; i < evlist->nr_mmaps; i++) {
262 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
263 cnt += 1;
264 ret = add_event(evlist, &events, event);
265 perf_evlist__mmap_consume(evlist, i);
266 if (ret < 0)
267 goto out_free_nodes;
268 }
269 }
270
271 events_array = calloc(cnt, sizeof(struct event_node));
272 if (!events_array) {
273 pr_debug("calloc failed\n");
274 ret = -1;
275 goto out_free_nodes;
276 }
277
278 pos = 0;
279 list_for_each_entry(node, &events, list)
280 events_array[pos++] = *node;
281
282 qsort(events_array, cnt, sizeof(struct event_node), compar);
283
284 for (pos = 0; pos < cnt; pos++) {
285 ret = process_event(evlist, events_array[pos].event,
286 switch_tracking);
287 if (ret < 0)
288 goto out_free;
289 }
290
291 ret = 0;
292out_free:
293 pr_debug("%u events recorded\n", cnt);
294 free(events_array);
295out_free_nodes:
296 free_event_nodes(&events);
297 return ret;
298}
299
300/**
301 * test__switch_tracking - test using sched_switch and tracking events.
302 *
303 * This function implements a test that checks that sched_switch events and
304 * tracking events can be recorded for a workload (current process) using the
305 * evsel->system_wide and evsel->tracking flags (respectively) with other events
306 * sometimes enabled or disabled.
307 */
308int test__switch_tracking(int subtest __maybe_unused)
309{
310 const char *sched_switch = "sched:sched_switch";
311 struct switch_tracking switch_tracking = { .tids = NULL, };
312 struct record_opts opts = {
313 .mmap_pages = UINT_MAX,
314 .user_freq = UINT_MAX,
315 .user_interval = ULLONG_MAX,
316 .freq = 4000,
317 .target = {
318 .uses_mmap = true,
319 },
320 };
321 struct thread_map *threads = NULL;
322 struct cpu_map *cpus = NULL;
323 struct perf_evlist *evlist = NULL;
324 struct perf_evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
325 struct perf_evsel *switch_evsel, *tracking_evsel;
326 const char *comm;
327 int err = -1;
328
329 threads = thread_map__new(-1, getpid(), UINT_MAX);
330 if (!threads) {
331 pr_debug("thread_map__new failed!\n");
332 goto out_err;
333 }
334
335 cpus = cpu_map__new(NULL);
336 if (!cpus) {
337 pr_debug("cpu_map__new failed!\n");
338 goto out_err;
339 }
340
341 evlist = perf_evlist__new();
342 if (!evlist) {
343 pr_debug("perf_evlist__new failed!\n");
344 goto out_err;
345 }
346
347 perf_evlist__set_maps(evlist, cpus, threads);
348
349 /* First event */
350 err = parse_events(evlist, "cpu-clock:u", NULL);
351 if (err) {
352 pr_debug("Failed to parse event dummy:u\n");
353 goto out_err;
354 }
355
356 cpu_clocks_evsel = perf_evlist__last(evlist);
357
358 /* Second event */
359 err = parse_events(evlist, "cycles:u", NULL);
360 if (err) {
361 pr_debug("Failed to parse event cycles:u\n");
362 goto out_err;
363 }
364
365 cycles_evsel = perf_evlist__last(evlist);
366
367 /* Third event */
368 if (!perf_evlist__can_select_event(evlist, sched_switch)) {
369 pr_debug("No sched_switch\n");
370 err = 0;
371 goto out;
372 }
373
374 err = parse_events(evlist, sched_switch, NULL);
375 if (err) {
376 pr_debug("Failed to parse event %s\n", sched_switch);
377 goto out_err;
378 }
379
380 switch_evsel = perf_evlist__last(evlist);
381
382 perf_evsel__set_sample_bit(switch_evsel, CPU);
383 perf_evsel__set_sample_bit(switch_evsel, TIME);
384
385 switch_evsel->system_wide = true;
386 switch_evsel->no_aux_samples = true;
387 switch_evsel->immediate = true;
388
389 /* Test moving an event to the front */
390 if (cycles_evsel == perf_evlist__first(evlist)) {
391 pr_debug("cycles event already at front");
392 goto out_err;
393 }
394 perf_evlist__to_front(evlist, cycles_evsel);
395 if (cycles_evsel != perf_evlist__first(evlist)) {
396 pr_debug("Failed to move cycles event to front");
397 goto out_err;
398 }
399
400 perf_evsel__set_sample_bit(cycles_evsel, CPU);
401 perf_evsel__set_sample_bit(cycles_evsel, TIME);
402
403 /* Fourth event */
404 err = parse_events(evlist, "dummy:u", NULL);
405 if (err) {
406 pr_debug("Failed to parse event dummy:u\n");
407 goto out_err;
408 }
409
410 tracking_evsel = perf_evlist__last(evlist);
411
412 perf_evlist__set_tracking_event(evlist, tracking_evsel);
413
414 tracking_evsel->attr.freq = 0;
415 tracking_evsel->attr.sample_period = 1;
416
417 perf_evsel__set_sample_bit(tracking_evsel, TIME);
418
419 /* Config events */
420 perf_evlist__config(evlist, &opts);
421
422 /* Check moved event is still at the front */
423 if (cycles_evsel != perf_evlist__first(evlist)) {
424 pr_debug("Front event no longer at front");
425 goto out_err;
426 }
427
428 /* Check tracking event is tracking */
429 if (!tracking_evsel->attr.mmap || !tracking_evsel->attr.comm) {
430 pr_debug("Tracking event not tracking\n");
431 goto out_err;
432 }
433
434 /* Check non-tracking events are not tracking */
435 evlist__for_each(evlist, evsel) {
436 if (evsel != tracking_evsel) {
437 if (evsel->attr.mmap || evsel->attr.comm) {
438 pr_debug("Non-tracking event is tracking\n");
439 goto out_err;
440 }
441 }
442 }
443
444 if (perf_evlist__open(evlist) < 0) {
445 pr_debug("Not supported\n");
446 err = 0;
447 goto out;
448 }
449
450 err = perf_evlist__mmap(evlist, UINT_MAX, false);
451 if (err) {
452 pr_debug("perf_evlist__mmap failed!\n");
453 goto out_err;
454 }
455
456 perf_evlist__enable(evlist);
457
458 err = perf_evsel__disable(cpu_clocks_evsel);
459 if (err) {
460 pr_debug("perf_evlist__disable_event failed!\n");
461 goto out_err;
462 }
463
464 err = spin_sleep();
465 if (err) {
466 pr_debug("spin_sleep failed!\n");
467 goto out_err;
468 }
469
470 comm = "Test COMM 1";
471 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
472 if (err) {
473 pr_debug("PR_SET_NAME failed!\n");
474 goto out_err;
475 }
476
477 err = perf_evsel__disable(cycles_evsel);
478 if (err) {
479 pr_debug("perf_evlist__disable_event failed!\n");
480 goto out_err;
481 }
482
483 comm = "Test COMM 2";
484 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
485 if (err) {
486 pr_debug("PR_SET_NAME failed!\n");
487 goto out_err;
488 }
489
490 err = spin_sleep();
491 if (err) {
492 pr_debug("spin_sleep failed!\n");
493 goto out_err;
494 }
495
496 comm = "Test COMM 3";
497 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
498 if (err) {
499 pr_debug("PR_SET_NAME failed!\n");
500 goto out_err;
501 }
502
503 err = perf_evsel__enable(cycles_evsel);
504 if (err) {
505 pr_debug("perf_evlist__disable_event failed!\n");
506 goto out_err;
507 }
508
509 comm = "Test COMM 4";
510 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
511 if (err) {
512 pr_debug("PR_SET_NAME failed!\n");
513 goto out_err;
514 }
515
516 err = spin_sleep();
517 if (err) {
518 pr_debug("spin_sleep failed!\n");
519 goto out_err;
520 }
521
522 perf_evlist__disable(evlist);
523
524 switch_tracking.switch_evsel = switch_evsel;
525 switch_tracking.cycles_evsel = cycles_evsel;
526
527 err = process_events(evlist, &switch_tracking);
528
529 zfree(&switch_tracking.tids);
530
531 if (err)
532 goto out_err;
533
534 /* Check all 4 comm events were seen i.e. that evsel->tracking works */
535 if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
536 !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
537 pr_debug("Missing comm events\n");
538 goto out_err;
539 }
540
541 /* Check cycles event got enabled */
542 if (!switch_tracking.cycles_before_comm_1) {
543 pr_debug("Missing cycles events\n");
544 goto out_err;
545 }
546
547 /* Check cycles event got disabled */
548 if (switch_tracking.cycles_between_comm_2_and_comm_3) {
549 pr_debug("cycles events even though event was disabled\n");
550 goto out_err;
551 }
552
553 /* Check cycles event got enabled again */
554 if (!switch_tracking.cycles_after_comm_4) {
555 pr_debug("Missing cycles events\n");
556 goto out_err;
557 }
558out:
559 if (evlist) {
560 perf_evlist__disable(evlist);
561 perf_evlist__delete(evlist);
562 } else {
563 cpu_map__put(cpus);
564 thread_map__put(threads);
565 }
566
567 return err;
568
569out_err:
570 err = -1;
571 goto out;
572}