Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d44bc558 AH |
2 | #include <sys/time.h> |
3 | #include <sys/prctl.h> | |
a43783ae | 4 | #include <errno.h> |
d44bc558 AH |
5 | #include <time.h> |
6 | #include <stdlib.h> | |
7f7c536f | 7 | #include <linux/zalloc.h> |
d44bc558 AH |
8 | |
9 | #include "parse-events.h" | |
10 | #include "evlist.h" | |
11 | #include "evsel.h" | |
12 | #include "thread_map.h" | |
13 | #include "cpumap.h" | |
14 | #include "tests.h" | |
15 | ||
16 | static int spin_sleep(void) | |
17 | { | |
18 | struct timeval start, now, diff, maxtime; | |
19 | struct timespec ts; | |
20 | int err, i; | |
21 | ||
22 | maxtime.tv_sec = 0; | |
23 | maxtime.tv_usec = 50000; | |
24 | ||
25 | err = gettimeofday(&start, NULL); | |
26 | if (err) | |
27 | return err; | |
28 | ||
29 | /* Spin for 50ms */ | |
30 | while (1) { | |
31 | for (i = 0; i < 1000; i++) | |
32 | barrier(); | |
33 | ||
34 | err = gettimeofday(&now, NULL); | |
35 | if (err) | |
36 | return err; | |
37 | ||
38 | timersub(&now, &start, &diff); | |
39 | if (timercmp(&diff, &maxtime, > /* For checkpatch */)) | |
40 | break; | |
41 | } | |
42 | ||
43 | ts.tv_nsec = 50 * 1000 * 1000; | |
44 | ts.tv_sec = 0; | |
45 | ||
46 | /* Sleep for 50ms */ | |
47 | err = nanosleep(&ts, NULL); | |
48 | if (err == EINTR) | |
49 | err = 0; | |
50 | ||
51 | return err; | |
52 | } | |
53 | ||
54 | struct switch_tracking { | |
32dcd021 JO |
55 | struct evsel *switch_evsel; |
56 | struct evsel *cycles_evsel; | |
d44bc558 AH |
57 | pid_t *tids; |
58 | int nr_tids; | |
59 | int comm_seen[4]; | |
60 | int cycles_before_comm_1; | |
61 | int cycles_between_comm_2_and_comm_3; | |
62 | int cycles_after_comm_4; | |
63 | }; | |
64 | ||
65 | static int check_comm(struct switch_tracking *switch_tracking, | |
66 | union perf_event *event, const char *comm, int nr) | |
67 | { | |
68 | if (event->header.type == PERF_RECORD_COMM && | |
69 | (pid_t)event->comm.pid == getpid() && | |
70 | (pid_t)event->comm.tid == getpid() && | |
71 | strcmp(event->comm.comm, comm) == 0) { | |
72 | if (switch_tracking->comm_seen[nr]) { | |
73 | pr_debug("Duplicate comm event\n"); | |
74 | return -1; | |
75 | } | |
76 | switch_tracking->comm_seen[nr] = 1; | |
77 | pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr); | |
78 | return 1; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static int check_cpu(struct switch_tracking *switch_tracking, int cpu) | |
84 | { | |
85 | int i, nr = cpu + 1; | |
86 | ||
87 | if (cpu < 0) | |
88 | return -1; | |
89 | ||
90 | if (!switch_tracking->tids) { | |
91 | switch_tracking->tids = calloc(nr, sizeof(pid_t)); | |
92 | if (!switch_tracking->tids) | |
93 | return -1; | |
94 | for (i = 0; i < nr; i++) | |
95 | switch_tracking->tids[i] = -1; | |
96 | switch_tracking->nr_tids = nr; | |
97 | return 0; | |
98 | } | |
99 | ||
100 | if (cpu >= switch_tracking->nr_tids) { | |
101 | void *addr; | |
102 | ||
103 | addr = realloc(switch_tracking->tids, nr * sizeof(pid_t)); | |
104 | if (!addr) | |
105 | return -1; | |
106 | switch_tracking->tids = addr; | |
107 | for (i = switch_tracking->nr_tids; i < nr; i++) | |
108 | switch_tracking->tids[i] = -1; | |
109 | switch_tracking->nr_tids = nr; | |
110 | return 0; | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
63503dba | 116 | static int process_sample_event(struct evlist *evlist, |
d44bc558 AH |
117 | union perf_event *event, |
118 | struct switch_tracking *switch_tracking) | |
119 | { | |
120 | struct perf_sample sample; | |
32dcd021 | 121 | struct evsel *evsel; |
d44bc558 AH |
122 | pid_t next_tid, prev_tid; |
123 | int cpu, err; | |
124 | ||
125 | if (perf_evlist__parse_sample(evlist, event, &sample)) { | |
126 | pr_debug("perf_evlist__parse_sample failed\n"); | |
127 | return -1; | |
128 | } | |
129 | ||
130 | evsel = perf_evlist__id2evsel(evlist, sample.id); | |
131 | if (evsel == switch_tracking->switch_evsel) { | |
132 | next_tid = perf_evsel__intval(evsel, &sample, "next_pid"); | |
133 | prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid"); | |
134 | cpu = sample.cpu; | |
135 | pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n", | |
136 | cpu, prev_tid, next_tid); | |
137 | err = check_cpu(switch_tracking, cpu); | |
138 | if (err) | |
139 | return err; | |
140 | /* | |
141 | * Check for no missing sched_switch events i.e. that the | |
142 | * evsel->system_wide flag has worked. | |
143 | */ | |
144 | if (switch_tracking->tids[cpu] != -1 && | |
145 | switch_tracking->tids[cpu] != prev_tid) { | |
146 | pr_debug("Missing sched_switch events\n"); | |
147 | return -1; | |
148 | } | |
149 | switch_tracking->tids[cpu] = next_tid; | |
150 | } | |
151 | ||
152 | if (evsel == switch_tracking->cycles_evsel) { | |
153 | pr_debug3("cycles event\n"); | |
154 | if (!switch_tracking->comm_seen[0]) | |
155 | switch_tracking->cycles_before_comm_1 = 1; | |
156 | if (switch_tracking->comm_seen[1] && | |
157 | !switch_tracking->comm_seen[2]) | |
158 | switch_tracking->cycles_between_comm_2_and_comm_3 = 1; | |
159 | if (switch_tracking->comm_seen[3]) | |
160 | switch_tracking->cycles_after_comm_4 = 1; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
63503dba | 166 | static int process_event(struct evlist *evlist, union perf_event *event, |
d44bc558 AH |
167 | struct switch_tracking *switch_tracking) |
168 | { | |
169 | if (event->header.type == PERF_RECORD_SAMPLE) | |
170 | return process_sample_event(evlist, event, switch_tracking); | |
171 | ||
172 | if (event->header.type == PERF_RECORD_COMM) { | |
173 | int err, done = 0; | |
174 | ||
175 | err = check_comm(switch_tracking, event, "Test COMM 1", 0); | |
176 | if (err < 0) | |
177 | return -1; | |
178 | done += err; | |
179 | err = check_comm(switch_tracking, event, "Test COMM 2", 1); | |
180 | if (err < 0) | |
181 | return -1; | |
182 | done += err; | |
183 | err = check_comm(switch_tracking, event, "Test COMM 3", 2); | |
184 | if (err < 0) | |
185 | return -1; | |
186 | done += err; | |
187 | err = check_comm(switch_tracking, event, "Test COMM 4", 3); | |
188 | if (err < 0) | |
189 | return -1; | |
190 | done += err; | |
191 | if (done != 1) { | |
192 | pr_debug("Unexpected comm event\n"); | |
193 | return -1; | |
194 | } | |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | struct event_node { | |
201 | struct list_head list; | |
202 | union perf_event *event; | |
203 | u64 event_time; | |
204 | }; | |
205 | ||
63503dba | 206 | static int add_event(struct evlist *evlist, struct list_head *events, |
d44bc558 AH |
207 | union perf_event *event) |
208 | { | |
209 | struct perf_sample sample; | |
210 | struct event_node *node; | |
211 | ||
212 | node = malloc(sizeof(struct event_node)); | |
213 | if (!node) { | |
214 | pr_debug("malloc failed\n"); | |
215 | return -1; | |
216 | } | |
217 | node->event = event; | |
218 | list_add(&node->list, events); | |
219 | ||
220 | if (perf_evlist__parse_sample(evlist, event, &sample)) { | |
221 | pr_debug("perf_evlist__parse_sample failed\n"); | |
222 | return -1; | |
223 | } | |
224 | ||
225 | if (!sample.time) { | |
226 | pr_debug("event with no time\n"); | |
227 | return -1; | |
228 | } | |
229 | ||
230 | node->event_time = sample.time; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static void free_event_nodes(struct list_head *events) | |
236 | { | |
237 | struct event_node *node; | |
238 | ||
239 | while (!list_empty(events)) { | |
240 | node = list_entry(events->next, struct event_node, list); | |
e56fbc9d | 241 | list_del_init(&node->list); |
d44bc558 AH |
242 | free(node); |
243 | } | |
244 | } | |
245 | ||
246 | static int compar(const void *a, const void *b) | |
247 | { | |
248 | const struct event_node *nodea = a; | |
249 | const struct event_node *nodeb = b; | |
250 | s64 cmp = nodea->event_time - nodeb->event_time; | |
251 | ||
252 | return cmp; | |
253 | } | |
254 | ||
63503dba | 255 | static int process_events(struct evlist *evlist, |
d44bc558 AH |
256 | struct switch_tracking *switch_tracking) |
257 | { | |
258 | union perf_event *event; | |
259 | unsigned pos, cnt = 0; | |
260 | LIST_HEAD(events); | |
261 | struct event_node *events_array, *node; | |
ee4024ff | 262 | struct perf_mmap *md; |
d44bc558 AH |
263 | int i, ret; |
264 | ||
265 | for (i = 0; i < evlist->nr_mmaps; i++) { | |
ee4024ff | 266 | md = &evlist->mmap[i]; |
b9bae2c8 | 267 | if (perf_mmap__read_init(md) < 0) |
ee4024ff KL |
268 | continue; |
269 | ||
0019dc87 | 270 | while ((event = perf_mmap__read_event(md)) != NULL) { |
d44bc558 AH |
271 | cnt += 1; |
272 | ret = add_event(evlist, &events, event); | |
d6ace3df | 273 | perf_mmap__consume(md); |
d44bc558 AH |
274 | if (ret < 0) |
275 | goto out_free_nodes; | |
276 | } | |
ee4024ff | 277 | perf_mmap__read_done(md); |
d44bc558 AH |
278 | } |
279 | ||
280 | events_array = calloc(cnt, sizeof(struct event_node)); | |
281 | if (!events_array) { | |
282 | pr_debug("calloc failed\n"); | |
283 | ret = -1; | |
284 | goto out_free_nodes; | |
285 | } | |
286 | ||
287 | pos = 0; | |
288 | list_for_each_entry(node, &events, list) | |
289 | events_array[pos++] = *node; | |
290 | ||
291 | qsort(events_array, cnt, sizeof(struct event_node), compar); | |
292 | ||
293 | for (pos = 0; pos < cnt; pos++) { | |
294 | ret = process_event(evlist, events_array[pos].event, | |
295 | switch_tracking); | |
296 | if (ret < 0) | |
297 | goto out_free; | |
298 | } | |
299 | ||
300 | ret = 0; | |
301 | out_free: | |
302 | pr_debug("%u events recorded\n", cnt); | |
303 | free(events_array); | |
304 | out_free_nodes: | |
305 | free_event_nodes(&events); | |
306 | return ret; | |
307 | } | |
308 | ||
309 | /** | |
310 | * test__switch_tracking - test using sched_switch and tracking events. | |
311 | * | |
312 | * This function implements a test that checks that sched_switch events and | |
313 | * tracking events can be recorded for a workload (current process) using the | |
314 | * evsel->system_wide and evsel->tracking flags (respectively) with other events | |
315 | * sometimes enabled or disabled. | |
316 | */ | |
81f17c90 | 317 | int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused) |
d44bc558 AH |
318 | { |
319 | const char *sched_switch = "sched:sched_switch"; | |
320 | struct switch_tracking switch_tracking = { .tids = NULL, }; | |
321 | struct record_opts opts = { | |
322 | .mmap_pages = UINT_MAX, | |
323 | .user_freq = UINT_MAX, | |
324 | .user_interval = ULLONG_MAX, | |
325 | .freq = 4000, | |
326 | .target = { | |
327 | .uses_mmap = true, | |
328 | }, | |
329 | }; | |
9749b90e | 330 | struct perf_thread_map *threads = NULL; |
f854839b | 331 | struct perf_cpu_map *cpus = NULL; |
63503dba | 332 | struct evlist *evlist = NULL; |
32dcd021 JO |
333 | struct evsel *evsel, *cpu_clocks_evsel, *cycles_evsel; |
334 | struct evsel *switch_evsel, *tracking_evsel; | |
d44bc558 AH |
335 | const char *comm; |
336 | int err = -1; | |
337 | ||
338 | threads = thread_map__new(-1, getpid(), UINT_MAX); | |
339 | if (!threads) { | |
340 | pr_debug("thread_map__new failed!\n"); | |
341 | goto out_err; | |
342 | } | |
343 | ||
344 | cpus = cpu_map__new(NULL); | |
345 | if (!cpus) { | |
346 | pr_debug("cpu_map__new failed!\n"); | |
347 | goto out_err; | |
348 | } | |
349 | ||
0f98b11c | 350 | evlist = evlist__new(); |
d44bc558 | 351 | if (!evlist) { |
0f98b11c | 352 | pr_debug("evlist__new failed!\n"); |
d44bc558 AH |
353 | goto out_err; |
354 | } | |
355 | ||
356 | perf_evlist__set_maps(evlist, cpus, threads); | |
357 | ||
358 | /* First event */ | |
b39b8393 | 359 | err = parse_events(evlist, "cpu-clock:u", NULL); |
d44bc558 AH |
360 | if (err) { |
361 | pr_debug("Failed to parse event dummy:u\n"); | |
362 | goto out_err; | |
363 | } | |
364 | ||
365 | cpu_clocks_evsel = perf_evlist__last(evlist); | |
366 | ||
367 | /* Second event */ | |
b39b8393 | 368 | err = parse_events(evlist, "cycles:u", NULL); |
d44bc558 AH |
369 | if (err) { |
370 | pr_debug("Failed to parse event cycles:u\n"); | |
371 | goto out_err; | |
372 | } | |
373 | ||
374 | cycles_evsel = perf_evlist__last(evlist); | |
375 | ||
376 | /* Third event */ | |
377 | if (!perf_evlist__can_select_event(evlist, sched_switch)) { | |
597bdeb4 | 378 | pr_debug("No sched_switch\n"); |
d44bc558 AH |
379 | err = 0; |
380 | goto out; | |
381 | } | |
382 | ||
b39b8393 | 383 | err = parse_events(evlist, sched_switch, NULL); |
d44bc558 AH |
384 | if (err) { |
385 | pr_debug("Failed to parse event %s\n", sched_switch); | |
386 | goto out_err; | |
387 | } | |
388 | ||
389 | switch_evsel = perf_evlist__last(evlist); | |
390 | ||
391 | perf_evsel__set_sample_bit(switch_evsel, CPU); | |
392 | perf_evsel__set_sample_bit(switch_evsel, TIME); | |
393 | ||
394 | switch_evsel->system_wide = true; | |
395 | switch_evsel->no_aux_samples = true; | |
396 | switch_evsel->immediate = true; | |
397 | ||
398 | /* Test moving an event to the front */ | |
399 | if (cycles_evsel == perf_evlist__first(evlist)) { | |
400 | pr_debug("cycles event already at front"); | |
401 | goto out_err; | |
402 | } | |
403 | perf_evlist__to_front(evlist, cycles_evsel); | |
404 | if (cycles_evsel != perf_evlist__first(evlist)) { | |
405 | pr_debug("Failed to move cycles event to front"); | |
406 | goto out_err; | |
407 | } | |
408 | ||
409 | perf_evsel__set_sample_bit(cycles_evsel, CPU); | |
410 | perf_evsel__set_sample_bit(cycles_evsel, TIME); | |
411 | ||
412 | /* Fourth event */ | |
b39b8393 | 413 | err = parse_events(evlist, "dummy:u", NULL); |
d44bc558 AH |
414 | if (err) { |
415 | pr_debug("Failed to parse event dummy:u\n"); | |
416 | goto out_err; | |
417 | } | |
418 | ||
419 | tracking_evsel = perf_evlist__last(evlist); | |
420 | ||
421 | perf_evlist__set_tracking_event(evlist, tracking_evsel); | |
422 | ||
423 | tracking_evsel->attr.freq = 0; | |
424 | tracking_evsel->attr.sample_period = 1; | |
425 | ||
426 | perf_evsel__set_sample_bit(tracking_evsel, TIME); | |
427 | ||
428 | /* Config events */ | |
e68ae9cf | 429 | perf_evlist__config(evlist, &opts, NULL); |
d44bc558 AH |
430 | |
431 | /* Check moved event is still at the front */ | |
432 | if (cycles_evsel != perf_evlist__first(evlist)) { | |
433 | pr_debug("Front event no longer at front"); | |
434 | goto out_err; | |
435 | } | |
436 | ||
437 | /* Check tracking event is tracking */ | |
438 | if (!tracking_evsel->attr.mmap || !tracking_evsel->attr.comm) { | |
439 | pr_debug("Tracking event not tracking\n"); | |
440 | goto out_err; | |
441 | } | |
442 | ||
443 | /* Check non-tracking events are not tracking */ | |
e5cadb93 | 444 | evlist__for_each_entry(evlist, evsel) { |
d44bc558 AH |
445 | if (evsel != tracking_evsel) { |
446 | if (evsel->attr.mmap || evsel->attr.comm) { | |
447 | pr_debug("Non-tracking event is tracking\n"); | |
448 | goto out_err; | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
474ddc4c | 453 | if (evlist__open(evlist) < 0) { |
597bdeb4 | 454 | pr_debug("Not supported\n"); |
d44bc558 AH |
455 | err = 0; |
456 | goto out; | |
457 | } | |
458 | ||
f74b9d3a | 459 | err = perf_evlist__mmap(evlist, UINT_MAX); |
d44bc558 AH |
460 | if (err) { |
461 | pr_debug("perf_evlist__mmap failed!\n"); | |
462 | goto out_err; | |
463 | } | |
464 | ||
1c87f165 | 465 | evlist__enable(evlist); |
d44bc558 | 466 | |
9a10bb22 | 467 | err = evsel__disable(cpu_clocks_evsel); |
d44bc558 AH |
468 | if (err) { |
469 | pr_debug("perf_evlist__disable_event failed!\n"); | |
470 | goto out_err; | |
471 | } | |
472 | ||
473 | err = spin_sleep(); | |
474 | if (err) { | |
475 | pr_debug("spin_sleep failed!\n"); | |
476 | goto out_err; | |
477 | } | |
478 | ||
479 | comm = "Test COMM 1"; | |
480 | err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0); | |
481 | if (err) { | |
482 | pr_debug("PR_SET_NAME failed!\n"); | |
483 | goto out_err; | |
484 | } | |
485 | ||
9a10bb22 | 486 | err = evsel__disable(cycles_evsel); |
d44bc558 AH |
487 | if (err) { |
488 | pr_debug("perf_evlist__disable_event failed!\n"); | |
489 | goto out_err; | |
490 | } | |
491 | ||
492 | comm = "Test COMM 2"; | |
493 | err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0); | |
494 | if (err) { | |
495 | pr_debug("PR_SET_NAME failed!\n"); | |
496 | goto out_err; | |
497 | } | |
498 | ||
499 | err = spin_sleep(); | |
500 | if (err) { | |
501 | pr_debug("spin_sleep failed!\n"); | |
502 | goto out_err; | |
503 | } | |
504 | ||
505 | comm = "Test COMM 3"; | |
506 | err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0); | |
507 | if (err) { | |
508 | pr_debug("PR_SET_NAME failed!\n"); | |
509 | goto out_err; | |
510 | } | |
511 | ||
ec7f24ef | 512 | err = evsel__enable(cycles_evsel); |
d44bc558 AH |
513 | if (err) { |
514 | pr_debug("perf_evlist__disable_event failed!\n"); | |
515 | goto out_err; | |
516 | } | |
517 | ||
518 | comm = "Test COMM 4"; | |
519 | err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0); | |
520 | if (err) { | |
521 | pr_debug("PR_SET_NAME failed!\n"); | |
522 | goto out_err; | |
523 | } | |
524 | ||
525 | err = spin_sleep(); | |
526 | if (err) { | |
527 | pr_debug("spin_sleep failed!\n"); | |
528 | goto out_err; | |
529 | } | |
530 | ||
e74676de | 531 | evlist__disable(evlist); |
d44bc558 AH |
532 | |
533 | switch_tracking.switch_evsel = switch_evsel; | |
534 | switch_tracking.cycles_evsel = cycles_evsel; | |
535 | ||
536 | err = process_events(evlist, &switch_tracking); | |
537 | ||
538 | zfree(&switch_tracking.tids); | |
539 | ||
540 | if (err) | |
541 | goto out_err; | |
542 | ||
543 | /* Check all 4 comm events were seen i.e. that evsel->tracking works */ | |
544 | if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] || | |
545 | !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) { | |
546 | pr_debug("Missing comm events\n"); | |
547 | goto out_err; | |
548 | } | |
549 | ||
550 | /* Check cycles event got enabled */ | |
551 | if (!switch_tracking.cycles_before_comm_1) { | |
552 | pr_debug("Missing cycles events\n"); | |
553 | goto out_err; | |
554 | } | |
555 | ||
556 | /* Check cycles event got disabled */ | |
557 | if (switch_tracking.cycles_between_comm_2_and_comm_3) { | |
558 | pr_debug("cycles events even though event was disabled\n"); | |
559 | goto out_err; | |
560 | } | |
561 | ||
562 | /* Check cycles event got enabled again */ | |
563 | if (!switch_tracking.cycles_after_comm_4) { | |
564 | pr_debug("Missing cycles events\n"); | |
565 | goto out_err; | |
566 | } | |
567 | out: | |
568 | if (evlist) { | |
e74676de | 569 | evlist__disable(evlist); |
c12995a5 | 570 | evlist__delete(evlist); |
d44bc558 | 571 | } else { |
38f01d8d | 572 | perf_cpu_map__put(cpus); |
186fbb74 | 573 | thread_map__put(threads); |
d44bc558 AH |
574 | } |
575 | ||
576 | return err; | |
577 | ||
578 | out_err: | |
579 | err = -1; | |
580 | goto out; | |
581 | } |