Loading...
1// SPDX-License-Identifier: GPL-2.0
2#include <sys/time.h>
3#include <sys/prctl.h>
4#include <errno.h>
5#include <limits.h>
6#include <time.h>
7#include <stdlib.h>
8#include <linux/zalloc.h>
9#include <perf/cpumap.h>
10#include <perf/evlist.h>
11
12#include "debug.h"
13#include "parse-events.h"
14#include "evlist.h"
15#include "evsel.h"
16#include "thread_map.h"
17#include "record.h"
18#include "tests.h"
19#include "util/mmap.h"
20
21static int spin_sleep(void)
22{
23 struct timeval start, now, diff, maxtime;
24 struct timespec ts;
25 int err, i;
26
27 maxtime.tv_sec = 0;
28 maxtime.tv_usec = 50000;
29
30 err = gettimeofday(&start, NULL);
31 if (err)
32 return err;
33
34 /* Spin for 50ms */
35 while (1) {
36 for (i = 0; i < 1000; i++)
37 barrier();
38
39 err = gettimeofday(&now, NULL);
40 if (err)
41 return err;
42
43 timersub(&now, &start, &diff);
44 if (timercmp(&diff, &maxtime, > /* For checkpatch */))
45 break;
46 }
47
48 ts.tv_nsec = 50 * 1000 * 1000;
49 ts.tv_sec = 0;
50
51 /* Sleep for 50ms */
52 err = nanosleep(&ts, NULL);
53 if (err == EINTR)
54 err = 0;
55
56 return err;
57}
58
59struct switch_tracking {
60 struct evsel *switch_evsel;
61 struct evsel *cycles_evsel;
62 pid_t *tids;
63 int nr_tids;
64 int comm_seen[4];
65 int cycles_before_comm_1;
66 int cycles_between_comm_2_and_comm_3;
67 int cycles_after_comm_4;
68};
69
70static int check_comm(struct switch_tracking *switch_tracking,
71 union perf_event *event, const char *comm, int nr)
72{
73 if (event->header.type == PERF_RECORD_COMM &&
74 (pid_t)event->comm.pid == getpid() &&
75 (pid_t)event->comm.tid == getpid() &&
76 strcmp(event->comm.comm, comm) == 0) {
77 if (switch_tracking->comm_seen[nr]) {
78 pr_debug("Duplicate comm event\n");
79 return -1;
80 }
81 switch_tracking->comm_seen[nr] = 1;
82 pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
83 return 1;
84 }
85 return 0;
86}
87
88static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
89{
90 int i, nr = cpu + 1;
91
92 if (cpu < 0)
93 return -1;
94
95 if (!switch_tracking->tids) {
96 switch_tracking->tids = calloc(nr, sizeof(pid_t));
97 if (!switch_tracking->tids)
98 return -1;
99 for (i = 0; i < nr; i++)
100 switch_tracking->tids[i] = -1;
101 switch_tracking->nr_tids = nr;
102 return 0;
103 }
104
105 if (cpu >= switch_tracking->nr_tids) {
106 void *addr;
107
108 addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
109 if (!addr)
110 return -1;
111 switch_tracking->tids = addr;
112 for (i = switch_tracking->nr_tids; i < nr; i++)
113 switch_tracking->tids[i] = -1;
114 switch_tracking->nr_tids = nr;
115 return 0;
116 }
117
118 return 0;
119}
120
121static int process_sample_event(struct evlist *evlist,
122 union perf_event *event,
123 struct switch_tracking *switch_tracking)
124{
125 struct perf_sample sample;
126 struct evsel *evsel;
127 pid_t next_tid, prev_tid;
128 int cpu, err;
129
130 if (perf_evlist__parse_sample(evlist, event, &sample)) {
131 pr_debug("perf_evlist__parse_sample failed\n");
132 return -1;
133 }
134
135 evsel = perf_evlist__id2evsel(evlist, sample.id);
136 if (evsel == switch_tracking->switch_evsel) {
137 next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
138 prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
139 cpu = sample.cpu;
140 pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
141 cpu, prev_tid, next_tid);
142 err = check_cpu(switch_tracking, cpu);
143 if (err)
144 return err;
145 /*
146 * Check for no missing sched_switch events i.e. that the
147 * evsel->core.system_wide flag has worked.
148 */
149 if (switch_tracking->tids[cpu] != -1 &&
150 switch_tracking->tids[cpu] != prev_tid) {
151 pr_debug("Missing sched_switch events\n");
152 return -1;
153 }
154 switch_tracking->tids[cpu] = next_tid;
155 }
156
157 if (evsel == switch_tracking->cycles_evsel) {
158 pr_debug3("cycles event\n");
159 if (!switch_tracking->comm_seen[0])
160 switch_tracking->cycles_before_comm_1 = 1;
161 if (switch_tracking->comm_seen[1] &&
162 !switch_tracking->comm_seen[2])
163 switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
164 if (switch_tracking->comm_seen[3])
165 switch_tracking->cycles_after_comm_4 = 1;
166 }
167
168 return 0;
169}
170
171static int process_event(struct evlist *evlist, union perf_event *event,
172 struct switch_tracking *switch_tracking)
173{
174 if (event->header.type == PERF_RECORD_SAMPLE)
175 return process_sample_event(evlist, event, switch_tracking);
176
177 if (event->header.type == PERF_RECORD_COMM) {
178 int err, done = 0;
179
180 err = check_comm(switch_tracking, event, "Test COMM 1", 0);
181 if (err < 0)
182 return -1;
183 done += err;
184 err = check_comm(switch_tracking, event, "Test COMM 2", 1);
185 if (err < 0)
186 return -1;
187 done += err;
188 err = check_comm(switch_tracking, event, "Test COMM 3", 2);
189 if (err < 0)
190 return -1;
191 done += err;
192 err = check_comm(switch_tracking, event, "Test COMM 4", 3);
193 if (err < 0)
194 return -1;
195 done += err;
196 if (done != 1) {
197 pr_debug("Unexpected comm event\n");
198 return -1;
199 }
200 }
201
202 return 0;
203}
204
205struct event_node {
206 struct list_head list;
207 union perf_event *event;
208 u64 event_time;
209};
210
211static int add_event(struct evlist *evlist, struct list_head *events,
212 union perf_event *event)
213{
214 struct perf_sample sample;
215 struct event_node *node;
216
217 node = malloc(sizeof(struct event_node));
218 if (!node) {
219 pr_debug("malloc failed\n");
220 return -1;
221 }
222 node->event = event;
223 list_add(&node->list, events);
224
225 if (perf_evlist__parse_sample(evlist, event, &sample)) {
226 pr_debug("perf_evlist__parse_sample failed\n");
227 return -1;
228 }
229
230 if (!sample.time) {
231 pr_debug("event with no time\n");
232 return -1;
233 }
234
235 node->event_time = sample.time;
236
237 return 0;
238}
239
240static void free_event_nodes(struct list_head *events)
241{
242 struct event_node *node;
243
244 while (!list_empty(events)) {
245 node = list_entry(events->next, struct event_node, list);
246 list_del_init(&node->list);
247 free(node);
248 }
249}
250
251static int compar(const void *a, const void *b)
252{
253 const struct event_node *nodea = a;
254 const struct event_node *nodeb = b;
255 s64 cmp = nodea->event_time - nodeb->event_time;
256
257 return cmp;
258}
259
260static int process_events(struct evlist *evlist,
261 struct switch_tracking *switch_tracking)
262{
263 union perf_event *event;
264 unsigned pos, cnt = 0;
265 LIST_HEAD(events);
266 struct event_node *events_array, *node;
267 struct mmap *md;
268 int i, ret;
269
270 for (i = 0; i < evlist->core.nr_mmaps; i++) {
271 md = &evlist->mmap[i];
272 if (perf_mmap__read_init(md) < 0)
273 continue;
274
275 while ((event = perf_mmap__read_event(md)) != NULL) {
276 cnt += 1;
277 ret = add_event(evlist, &events, event);
278 perf_mmap__consume(md);
279 if (ret < 0)
280 goto out_free_nodes;
281 }
282 perf_mmap__read_done(md);
283 }
284
285 events_array = calloc(cnt, sizeof(struct event_node));
286 if (!events_array) {
287 pr_debug("calloc failed\n");
288 ret = -1;
289 goto out_free_nodes;
290 }
291
292 pos = 0;
293 list_for_each_entry(node, &events, list)
294 events_array[pos++] = *node;
295
296 qsort(events_array, cnt, sizeof(struct event_node), compar);
297
298 for (pos = 0; pos < cnt; pos++) {
299 ret = process_event(evlist, events_array[pos].event,
300 switch_tracking);
301 if (ret < 0)
302 goto out_free;
303 }
304
305 ret = 0;
306out_free:
307 pr_debug("%u events recorded\n", cnt);
308 free(events_array);
309out_free_nodes:
310 free_event_nodes(&events);
311 return ret;
312}
313
314/**
315 * test__switch_tracking - test using sched_switch and tracking events.
316 *
317 * This function implements a test that checks that sched_switch events and
318 * tracking events can be recorded for a workload (current process) using the
319 * evsel->core.system_wide and evsel->tracking flags (respectively) with other events
320 * sometimes enabled or disabled.
321 */
322int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
323{
324 const char *sched_switch = "sched:sched_switch";
325 struct switch_tracking switch_tracking = { .tids = NULL, };
326 struct record_opts opts = {
327 .mmap_pages = UINT_MAX,
328 .user_freq = UINT_MAX,
329 .user_interval = ULLONG_MAX,
330 .freq = 4000,
331 .target = {
332 .uses_mmap = true,
333 },
334 };
335 struct perf_thread_map *threads = NULL;
336 struct perf_cpu_map *cpus = NULL;
337 struct evlist *evlist = NULL;
338 struct evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
339 struct evsel *switch_evsel, *tracking_evsel;
340 const char *comm;
341 int err = -1;
342
343 threads = thread_map__new(-1, getpid(), UINT_MAX);
344 if (!threads) {
345 pr_debug("thread_map__new failed!\n");
346 goto out_err;
347 }
348
349 cpus = perf_cpu_map__new(NULL);
350 if (!cpus) {
351 pr_debug("perf_cpu_map__new failed!\n");
352 goto out_err;
353 }
354
355 evlist = evlist__new();
356 if (!evlist) {
357 pr_debug("evlist__new failed!\n");
358 goto out_err;
359 }
360
361 perf_evlist__set_maps(&evlist->core, cpus, threads);
362
363 /* First event */
364 err = parse_events(evlist, "cpu-clock:u", NULL);
365 if (err) {
366 pr_debug("Failed to parse event dummy:u\n");
367 goto out_err;
368 }
369
370 cpu_clocks_evsel = evlist__last(evlist);
371
372 /* Second event */
373 err = parse_events(evlist, "cycles:u", NULL);
374 if (err) {
375 pr_debug("Failed to parse event cycles:u\n");
376 goto out_err;
377 }
378
379 cycles_evsel = evlist__last(evlist);
380
381 /* Third event */
382 if (!perf_evlist__can_select_event(evlist, sched_switch)) {
383 pr_debug("No sched_switch\n");
384 err = 0;
385 goto out;
386 }
387
388 err = parse_events(evlist, sched_switch, NULL);
389 if (err) {
390 pr_debug("Failed to parse event %s\n", sched_switch);
391 goto out_err;
392 }
393
394 switch_evsel = evlist__last(evlist);
395
396 perf_evsel__set_sample_bit(switch_evsel, CPU);
397 perf_evsel__set_sample_bit(switch_evsel, TIME);
398
399 switch_evsel->core.system_wide = true;
400 switch_evsel->no_aux_samples = true;
401 switch_evsel->immediate = true;
402
403 /* Test moving an event to the front */
404 if (cycles_evsel == evlist__first(evlist)) {
405 pr_debug("cycles event already at front");
406 goto out_err;
407 }
408 perf_evlist__to_front(evlist, cycles_evsel);
409 if (cycles_evsel != evlist__first(evlist)) {
410 pr_debug("Failed to move cycles event to front");
411 goto out_err;
412 }
413
414 perf_evsel__set_sample_bit(cycles_evsel, CPU);
415 perf_evsel__set_sample_bit(cycles_evsel, TIME);
416
417 /* Fourth event */
418 err = parse_events(evlist, "dummy:u", NULL);
419 if (err) {
420 pr_debug("Failed to parse event dummy:u\n");
421 goto out_err;
422 }
423
424 tracking_evsel = evlist__last(evlist);
425
426 perf_evlist__set_tracking_event(evlist, tracking_evsel);
427
428 tracking_evsel->core.attr.freq = 0;
429 tracking_evsel->core.attr.sample_period = 1;
430
431 perf_evsel__set_sample_bit(tracking_evsel, TIME);
432
433 /* Config events */
434 perf_evlist__config(evlist, &opts, NULL);
435
436 /* Check moved event is still at the front */
437 if (cycles_evsel != evlist__first(evlist)) {
438 pr_debug("Front event no longer at front");
439 goto out_err;
440 }
441
442 /* Check tracking event is tracking */
443 if (!tracking_evsel->core.attr.mmap || !tracking_evsel->core.attr.comm) {
444 pr_debug("Tracking event not tracking\n");
445 goto out_err;
446 }
447
448 /* Check non-tracking events are not tracking */
449 evlist__for_each_entry(evlist, evsel) {
450 if (evsel != tracking_evsel) {
451 if (evsel->core.attr.mmap || evsel->core.attr.comm) {
452 pr_debug("Non-tracking event is tracking\n");
453 goto out_err;
454 }
455 }
456 }
457
458 if (evlist__open(evlist) < 0) {
459 pr_debug("Not supported\n");
460 err = 0;
461 goto out;
462 }
463
464 err = evlist__mmap(evlist, UINT_MAX);
465 if (err) {
466 pr_debug("evlist__mmap failed!\n");
467 goto out_err;
468 }
469
470 evlist__enable(evlist);
471
472 err = evsel__disable(cpu_clocks_evsel);
473 if (err) {
474 pr_debug("perf_evlist__disable_event failed!\n");
475 goto out_err;
476 }
477
478 err = spin_sleep();
479 if (err) {
480 pr_debug("spin_sleep failed!\n");
481 goto out_err;
482 }
483
484 comm = "Test COMM 1";
485 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
486 if (err) {
487 pr_debug("PR_SET_NAME failed!\n");
488 goto out_err;
489 }
490
491 err = evsel__disable(cycles_evsel);
492 if (err) {
493 pr_debug("perf_evlist__disable_event failed!\n");
494 goto out_err;
495 }
496
497 comm = "Test COMM 2";
498 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
499 if (err) {
500 pr_debug("PR_SET_NAME failed!\n");
501 goto out_err;
502 }
503
504 err = spin_sleep();
505 if (err) {
506 pr_debug("spin_sleep failed!\n");
507 goto out_err;
508 }
509
510 comm = "Test COMM 3";
511 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
512 if (err) {
513 pr_debug("PR_SET_NAME failed!\n");
514 goto out_err;
515 }
516
517 err = evsel__enable(cycles_evsel);
518 if (err) {
519 pr_debug("perf_evlist__disable_event failed!\n");
520 goto out_err;
521 }
522
523 comm = "Test COMM 4";
524 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
525 if (err) {
526 pr_debug("PR_SET_NAME failed!\n");
527 goto out_err;
528 }
529
530 err = spin_sleep();
531 if (err) {
532 pr_debug("spin_sleep failed!\n");
533 goto out_err;
534 }
535
536 evlist__disable(evlist);
537
538 switch_tracking.switch_evsel = switch_evsel;
539 switch_tracking.cycles_evsel = cycles_evsel;
540
541 err = process_events(evlist, &switch_tracking);
542
543 zfree(&switch_tracking.tids);
544
545 if (err)
546 goto out_err;
547
548 /* Check all 4 comm events were seen i.e. that evsel->tracking works */
549 if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
550 !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
551 pr_debug("Missing comm events\n");
552 goto out_err;
553 }
554
555 /* Check cycles event got enabled */
556 if (!switch_tracking.cycles_before_comm_1) {
557 pr_debug("Missing cycles events\n");
558 goto out_err;
559 }
560
561 /* Check cycles event got disabled */
562 if (switch_tracking.cycles_between_comm_2_and_comm_3) {
563 pr_debug("cycles events even though event was disabled\n");
564 goto out_err;
565 }
566
567 /* Check cycles event got enabled again */
568 if (!switch_tracking.cycles_after_comm_4) {
569 pr_debug("Missing cycles events\n");
570 goto out_err;
571 }
572out:
573 if (evlist) {
574 evlist__disable(evlist);
575 evlist__delete(evlist);
576 } else {
577 perf_cpu_map__put(cpus);
578 perf_thread_map__put(threads);
579 }
580
581 return err;
582
583out_err:
584 err = -1;
585 goto out;
586}
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}