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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}
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#include <perf/mmap.h>
12
13#include "debug.h"
14#include "parse-events.h"
15#include "evlist.h"
16#include "evsel.h"
17#include "thread_map.h"
18#include "record.h"
19#include "tests.h"
20#include "util/mmap.h"
21#include "pmu.h"
22
23static int spin_sleep(void)
24{
25 struct timeval start, now, diff, maxtime;
26 struct timespec ts;
27 int err, i;
28
29 maxtime.tv_sec = 0;
30 maxtime.tv_usec = 50000;
31
32 err = gettimeofday(&start, NULL);
33 if (err)
34 return err;
35
36 /* Spin for 50ms */
37 while (1) {
38 for (i = 0; i < 1000; i++)
39 barrier();
40
41 err = gettimeofday(&now, NULL);
42 if (err)
43 return err;
44
45 timersub(&now, &start, &diff);
46 if (timercmp(&diff, &maxtime, > /* For checkpatch */))
47 break;
48 }
49
50 ts.tv_nsec = 50 * 1000 * 1000;
51 ts.tv_sec = 0;
52
53 /* Sleep for 50ms */
54 err = nanosleep(&ts, NULL);
55 if (err == EINTR)
56 err = 0;
57
58 return err;
59}
60
61struct switch_tracking {
62 struct evsel *switch_evsel;
63 struct evsel *cycles_evsel;
64 pid_t *tids;
65 int nr_tids;
66 int comm_seen[4];
67 int cycles_before_comm_1;
68 int cycles_between_comm_2_and_comm_3;
69 int cycles_after_comm_4;
70};
71
72static int check_comm(struct switch_tracking *switch_tracking,
73 union perf_event *event, const char *comm, int nr)
74{
75 if (event->header.type == PERF_RECORD_COMM &&
76 (pid_t)event->comm.pid == getpid() &&
77 (pid_t)event->comm.tid == getpid() &&
78 strcmp(event->comm.comm, comm) == 0) {
79 if (switch_tracking->comm_seen[nr]) {
80 pr_debug("Duplicate comm event\n");
81 return -1;
82 }
83 switch_tracking->comm_seen[nr] = 1;
84 pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
85 return 1;
86 }
87 return 0;
88}
89
90static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
91{
92 int i, nr = cpu + 1;
93
94 if (cpu < 0)
95 return -1;
96
97 if (!switch_tracking->tids) {
98 switch_tracking->tids = calloc(nr, sizeof(pid_t));
99 if (!switch_tracking->tids)
100 return -1;
101 for (i = 0; i < nr; i++)
102 switch_tracking->tids[i] = -1;
103 switch_tracking->nr_tids = nr;
104 return 0;
105 }
106
107 if (cpu >= switch_tracking->nr_tids) {
108 void *addr;
109
110 addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
111 if (!addr)
112 return -1;
113 switch_tracking->tids = addr;
114 for (i = switch_tracking->nr_tids; i < nr; i++)
115 switch_tracking->tids[i] = -1;
116 switch_tracking->nr_tids = nr;
117 return 0;
118 }
119
120 return 0;
121}
122
123static int process_sample_event(struct evlist *evlist,
124 union perf_event *event,
125 struct switch_tracking *switch_tracking)
126{
127 struct perf_sample sample;
128 struct evsel *evsel;
129 pid_t next_tid, prev_tid;
130 int cpu, err;
131
132 if (evlist__parse_sample(evlist, event, &sample)) {
133 pr_debug("evlist__parse_sample failed\n");
134 return -1;
135 }
136
137 evsel = evlist__id2evsel(evlist, sample.id);
138 if (evsel == switch_tracking->switch_evsel) {
139 next_tid = evsel__intval(evsel, &sample, "next_pid");
140 prev_tid = evsel__intval(evsel, &sample, "prev_pid");
141 cpu = sample.cpu;
142 pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
143 cpu, prev_tid, next_tid);
144 err = check_cpu(switch_tracking, cpu);
145 if (err)
146 return err;
147 /*
148 * Check for no missing sched_switch events i.e. that the
149 * evsel->core.system_wide flag has worked.
150 */
151 if (switch_tracking->tids[cpu] != -1 &&
152 switch_tracking->tids[cpu] != prev_tid) {
153 pr_debug("Missing sched_switch events\n");
154 return -1;
155 }
156 switch_tracking->tids[cpu] = next_tid;
157 }
158
159 if (evsel == switch_tracking->cycles_evsel) {
160 pr_debug3("cycles event\n");
161 if (!switch_tracking->comm_seen[0])
162 switch_tracking->cycles_before_comm_1 = 1;
163 if (switch_tracking->comm_seen[1] &&
164 !switch_tracking->comm_seen[2])
165 switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
166 if (switch_tracking->comm_seen[3])
167 switch_tracking->cycles_after_comm_4 = 1;
168 }
169
170 return 0;
171}
172
173static int process_event(struct evlist *evlist, union perf_event *event,
174 struct switch_tracking *switch_tracking)
175{
176 if (event->header.type == PERF_RECORD_SAMPLE)
177 return process_sample_event(evlist, event, switch_tracking);
178
179 if (event->header.type == PERF_RECORD_COMM) {
180 int err, done = 0;
181
182 err = check_comm(switch_tracking, event, "Test COMM 1", 0);
183 if (err < 0)
184 return -1;
185 done += err;
186 err = check_comm(switch_tracking, event, "Test COMM 2", 1);
187 if (err < 0)
188 return -1;
189 done += err;
190 err = check_comm(switch_tracking, event, "Test COMM 3", 2);
191 if (err < 0)
192 return -1;
193 done += err;
194 err = check_comm(switch_tracking, event, "Test COMM 4", 3);
195 if (err < 0)
196 return -1;
197 done += err;
198 if (done != 1) {
199 pr_debug("Unexpected comm event\n");
200 return -1;
201 }
202 }
203
204 return 0;
205}
206
207struct event_node {
208 struct list_head list;
209 union perf_event *event;
210 u64 event_time;
211};
212
213static int add_event(struct evlist *evlist, struct list_head *events,
214 union perf_event *event)
215{
216 struct perf_sample sample;
217 struct event_node *node;
218
219 node = malloc(sizeof(struct event_node));
220 if (!node) {
221 pr_debug("malloc failed\n");
222 return -1;
223 }
224 node->event = event;
225 list_add(&node->list, events);
226
227 if (evlist__parse_sample(evlist, event, &sample)) {
228 pr_debug("evlist__parse_sample failed\n");
229 return -1;
230 }
231
232 if (!sample.time) {
233 pr_debug("event with no time\n");
234 return -1;
235 }
236
237 node->event_time = sample.time;
238
239 return 0;
240}
241
242static void free_event_nodes(struct list_head *events)
243{
244 struct event_node *node;
245
246 while (!list_empty(events)) {
247 node = list_entry(events->next, struct event_node, list);
248 list_del_init(&node->list);
249 free(node);
250 }
251}
252
253static int compar(const void *a, const void *b)
254{
255 const struct event_node *nodea = a;
256 const struct event_node *nodeb = b;
257 s64 cmp = nodea->event_time - nodeb->event_time;
258
259 return cmp;
260}
261
262static int process_events(struct evlist *evlist,
263 struct switch_tracking *switch_tracking)
264{
265 union perf_event *event;
266 unsigned pos, cnt = 0;
267 LIST_HEAD(events);
268 struct event_node *events_array, *node;
269 struct mmap *md;
270 int i, ret;
271
272 for (i = 0; i < evlist->core.nr_mmaps; i++) {
273 md = &evlist->mmap[i];
274 if (perf_mmap__read_init(&md->core) < 0)
275 continue;
276
277 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
278 cnt += 1;
279 ret = add_event(evlist, &events, event);
280 perf_mmap__consume(&md->core);
281 if (ret < 0)
282 goto out_free_nodes;
283 }
284 perf_mmap__read_done(&md->core);
285 }
286
287 events_array = calloc(cnt, sizeof(struct event_node));
288 if (!events_array) {
289 pr_debug("calloc failed\n");
290 ret = -1;
291 goto out_free_nodes;
292 }
293
294 pos = 0;
295 list_for_each_entry(node, &events, list)
296 events_array[pos++] = *node;
297
298 qsort(events_array, cnt, sizeof(struct event_node), compar);
299
300 for (pos = 0; pos < cnt; pos++) {
301 ret = process_event(evlist, events_array[pos].event,
302 switch_tracking);
303 if (ret < 0)
304 goto out_free;
305 }
306
307 ret = 0;
308out_free:
309 pr_debug("%u events recorded\n", cnt);
310 free(events_array);
311out_free_nodes:
312 free_event_nodes(&events);
313 return ret;
314}
315
316/**
317 * test__switch_tracking - test using sched_switch and tracking events.
318 *
319 * This function implements a test that checks that sched_switch events and
320 * tracking events can be recorded for a workload (current process) using the
321 * evsel->core.system_wide and evsel->tracking flags (respectively) with other events
322 * sometimes enabled or disabled.
323 */
324int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
325{
326 const char *sched_switch = "sched:sched_switch";
327 struct switch_tracking switch_tracking = { .tids = NULL, };
328 struct record_opts opts = {
329 .mmap_pages = UINT_MAX,
330 .user_freq = UINT_MAX,
331 .user_interval = ULLONG_MAX,
332 .freq = 4000,
333 .target = {
334 .uses_mmap = true,
335 },
336 };
337 struct perf_thread_map *threads = NULL;
338 struct perf_cpu_map *cpus = NULL;
339 struct evlist *evlist = NULL;
340 struct evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
341 struct evsel *switch_evsel, *tracking_evsel;
342 const char *comm;
343 int err = -1;
344
345 threads = thread_map__new(-1, getpid(), UINT_MAX);
346 if (!threads) {
347 pr_debug("thread_map__new failed!\n");
348 goto out_err;
349 }
350
351 cpus = perf_cpu_map__new(NULL);
352 if (!cpus) {
353 pr_debug("perf_cpu_map__new failed!\n");
354 goto out_err;
355 }
356
357 evlist = evlist__new();
358 if (!evlist) {
359 pr_debug("evlist__new failed!\n");
360 goto out_err;
361 }
362
363 perf_evlist__set_maps(&evlist->core, cpus, threads);
364
365 /* First event */
366 err = parse_events(evlist, "cpu-clock:u", NULL);
367 if (err) {
368 pr_debug("Failed to parse event dummy:u\n");
369 goto out_err;
370 }
371
372 cpu_clocks_evsel = evlist__last(evlist);
373
374 /* Second event */
375 if (perf_pmu__has_hybrid())
376 err = parse_events(evlist, "cpu_core/cycles/u", NULL);
377 else
378 err = parse_events(evlist, "cycles:u", NULL);
379 if (err) {
380 pr_debug("Failed to parse event cycles:u\n");
381 goto out_err;
382 }
383
384 cycles_evsel = evlist__last(evlist);
385
386 /* Third event */
387 if (!evlist__can_select_event(evlist, sched_switch)) {
388 pr_debug("No sched_switch\n");
389 err = 0;
390 goto out;
391 }
392
393 err = parse_events(evlist, sched_switch, NULL);
394 if (err) {
395 pr_debug("Failed to parse event %s\n", sched_switch);
396 goto out_err;
397 }
398
399 switch_evsel = evlist__last(evlist);
400
401 evsel__set_sample_bit(switch_evsel, CPU);
402 evsel__set_sample_bit(switch_evsel, TIME);
403
404 switch_evsel->core.system_wide = true;
405 switch_evsel->no_aux_samples = true;
406 switch_evsel->immediate = true;
407
408 /* Test moving an event to the front */
409 if (cycles_evsel == evlist__first(evlist)) {
410 pr_debug("cycles event already at front");
411 goto out_err;
412 }
413 evlist__to_front(evlist, cycles_evsel);
414 if (cycles_evsel != evlist__first(evlist)) {
415 pr_debug("Failed to move cycles event to front");
416 goto out_err;
417 }
418
419 evsel__set_sample_bit(cycles_evsel, CPU);
420 evsel__set_sample_bit(cycles_evsel, TIME);
421
422 /* Fourth event */
423 err = parse_events(evlist, "dummy:u", NULL);
424 if (err) {
425 pr_debug("Failed to parse event dummy:u\n");
426 goto out_err;
427 }
428
429 tracking_evsel = evlist__last(evlist);
430
431 evlist__set_tracking_event(evlist, tracking_evsel);
432
433 tracking_evsel->core.attr.freq = 0;
434 tracking_evsel->core.attr.sample_period = 1;
435
436 evsel__set_sample_bit(tracking_evsel, TIME);
437
438 /* Config events */
439 evlist__config(evlist, &opts, NULL);
440
441 /* Check moved event is still at the front */
442 if (cycles_evsel != evlist__first(evlist)) {
443 pr_debug("Front event no longer at front");
444 goto out_err;
445 }
446
447 /* Check tracking event is tracking */
448 if (!tracking_evsel->core.attr.mmap || !tracking_evsel->core.attr.comm) {
449 pr_debug("Tracking event not tracking\n");
450 goto out_err;
451 }
452
453 /* Check non-tracking events are not tracking */
454 evlist__for_each_entry(evlist, evsel) {
455 if (evsel != tracking_evsel) {
456 if (evsel->core.attr.mmap || evsel->core.attr.comm) {
457 pr_debug("Non-tracking event is tracking\n");
458 goto out_err;
459 }
460 }
461 }
462
463 if (evlist__open(evlist) < 0) {
464 pr_debug("Not supported\n");
465 err = 0;
466 goto out;
467 }
468
469 err = evlist__mmap(evlist, UINT_MAX);
470 if (err) {
471 pr_debug("evlist__mmap failed!\n");
472 goto out_err;
473 }
474
475 evlist__enable(evlist);
476
477 err = evsel__disable(cpu_clocks_evsel);
478 if (err) {
479 pr_debug("perf_evlist__disable_event failed!\n");
480 goto out_err;
481 }
482
483 err = spin_sleep();
484 if (err) {
485 pr_debug("spin_sleep failed!\n");
486 goto out_err;
487 }
488
489 comm = "Test COMM 1";
490 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
491 if (err) {
492 pr_debug("PR_SET_NAME failed!\n");
493 goto out_err;
494 }
495
496 err = evsel__disable(cycles_evsel);
497 if (err) {
498 pr_debug("perf_evlist__disable_event failed!\n");
499 goto out_err;
500 }
501
502 comm = "Test COMM 2";
503 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
504 if (err) {
505 pr_debug("PR_SET_NAME failed!\n");
506 goto out_err;
507 }
508
509 err = spin_sleep();
510 if (err) {
511 pr_debug("spin_sleep failed!\n");
512 goto out_err;
513 }
514
515 comm = "Test COMM 3";
516 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
517 if (err) {
518 pr_debug("PR_SET_NAME failed!\n");
519 goto out_err;
520 }
521
522 err = evsel__enable(cycles_evsel);
523 if (err) {
524 pr_debug("perf_evlist__disable_event failed!\n");
525 goto out_err;
526 }
527
528 comm = "Test COMM 4";
529 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
530 if (err) {
531 pr_debug("PR_SET_NAME failed!\n");
532 goto out_err;
533 }
534
535 err = spin_sleep();
536 if (err) {
537 pr_debug("spin_sleep failed!\n");
538 goto out_err;
539 }
540
541 evlist__disable(evlist);
542
543 switch_tracking.switch_evsel = switch_evsel;
544 switch_tracking.cycles_evsel = cycles_evsel;
545
546 err = process_events(evlist, &switch_tracking);
547
548 zfree(&switch_tracking.tids);
549
550 if (err)
551 goto out_err;
552
553 /* Check all 4 comm events were seen i.e. that evsel->tracking works */
554 if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
555 !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
556 pr_debug("Missing comm events\n");
557 goto out_err;
558 }
559
560 /* Check cycles event got enabled */
561 if (!switch_tracking.cycles_before_comm_1) {
562 pr_debug("Missing cycles events\n");
563 goto out_err;
564 }
565
566 /* Check cycles event got disabled */
567 if (switch_tracking.cycles_between_comm_2_and_comm_3) {
568 pr_debug("cycles events even though event was disabled\n");
569 goto out_err;
570 }
571
572 /* Check cycles event got enabled again */
573 if (!switch_tracking.cycles_after_comm_4) {
574 pr_debug("Missing cycles events\n");
575 goto out_err;
576 }
577out:
578 if (evlist) {
579 evlist__disable(evlist);
580 evlist__delete(evlist);
581 }
582 perf_cpu_map__put(cpus);
583 perf_thread_map__put(threads);
584
585 return err;
586
587out_err:
588 err = -1;
589 goto out;
590}