6 #include "parse-events.h"
9 #include "thread_map.h"
13 static int spin_sleep(void)
15 struct timeval start, now, diff, maxtime;
20 maxtime.tv_usec = 50000;
22 err = gettimeofday(&start, NULL);
28 for (i = 0; i < 1000; i++)
31 err = gettimeofday(&now, NULL);
35 timersub(&now, &start, &diff);
36 if (timercmp(&diff, &maxtime, > /* For checkpatch */))
40 ts.tv_nsec = 50 * 1000 * 1000;
44 err = nanosleep(&ts, NULL);
51 struct switch_tracking {
52 struct perf_evsel *switch_evsel;
53 struct perf_evsel *cycles_evsel;
57 int cycles_before_comm_1;
58 int cycles_between_comm_2_and_comm_3;
59 int cycles_after_comm_4;
62 static int check_comm(struct switch_tracking *switch_tracking,
63 union perf_event *event, const char *comm, int nr)
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");
73 switch_tracking->comm_seen[nr] = 1;
74 pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
80 static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
87 if (!switch_tracking->tids) {
88 switch_tracking->tids = calloc(nr, sizeof(pid_t));
89 if (!switch_tracking->tids)
91 for (i = 0; i < nr; i++)
92 switch_tracking->tids[i] = -1;
93 switch_tracking->nr_tids = nr;
97 if (cpu >= switch_tracking->nr_tids) {
100 addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
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;
113 static int process_sample_event(struct perf_evlist *evlist,
114 union perf_event *event,
115 struct switch_tracking *switch_tracking)
117 struct perf_sample sample;
118 struct perf_evsel *evsel;
119 pid_t next_tid, prev_tid;
122 if (perf_evlist__parse_sample(evlist, event, &sample)) {
123 pr_debug("perf_evlist__parse_sample failed\n");
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");
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);
138 * Check for no missing sched_switch events i.e. that the
139 * evsel->system_wide flag has worked.
141 if (switch_tracking->tids[cpu] != -1 &&
142 switch_tracking->tids[cpu] != prev_tid) {
143 pr_debug("Missing sched_switch events\n");
146 switch_tracking->tids[cpu] = next_tid;
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;
163 static int process_event(struct perf_evlist *evlist, union perf_event *event,
164 struct switch_tracking *switch_tracking)
166 if (event->header.type == PERF_RECORD_SAMPLE)
167 return process_sample_event(evlist, event, switch_tracking);
169 if (event->header.type == PERF_RECORD_COMM) {
172 err = check_comm(switch_tracking, event, "Test COMM 1", 0);
176 err = check_comm(switch_tracking, event, "Test COMM 2", 1);
180 err = check_comm(switch_tracking, event, "Test COMM 3", 2);
184 err = check_comm(switch_tracking, event, "Test COMM 4", 3);
189 pr_debug("Unexpected comm event\n");
198 struct list_head list;
199 union perf_event *event;
203 static int add_event(struct perf_evlist *evlist, struct list_head *events,
204 union perf_event *event)
206 struct perf_sample sample;
207 struct event_node *node;
209 node = malloc(sizeof(struct event_node));
211 pr_debug("malloc failed\n");
215 list_add(&node->list, events);
217 if (perf_evlist__parse_sample(evlist, event, &sample)) {
218 pr_debug("perf_evlist__parse_sample failed\n");
223 pr_debug("event with no time\n");
227 node->event_time = sample.time;
232 static void free_event_nodes(struct list_head *events)
234 struct event_node *node;
236 while (!list_empty(events)) {
237 node = list_entry(events->next, struct event_node, list);
238 list_del(&node->list);
243 static int compar(const void *a, const void *b)
245 const struct event_node *nodea = a;
246 const struct event_node *nodeb = b;
247 s64 cmp = nodea->event_time - nodeb->event_time;
252 static int process_events(struct perf_evlist *evlist,
253 struct switch_tracking *switch_tracking)
255 union perf_event *event;
256 unsigned pos, cnt = 0;
258 struct event_node *events_array, *node;
261 for (i = 0; i < evlist->nr_mmaps; i++) {
262 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
264 ret = add_event(evlist, &events, event);
265 perf_evlist__mmap_consume(evlist, i);
271 events_array = calloc(cnt, sizeof(struct event_node));
273 pr_debug("calloc failed\n");
279 list_for_each_entry(node, &events, list)
280 events_array[pos++] = *node;
282 qsort(events_array, cnt, sizeof(struct event_node), compar);
284 for (pos = 0; pos < cnt; pos++) {
285 ret = process_event(evlist, events_array[pos].event,
293 pr_debug("%u events recorded\n", cnt);
296 free_event_nodes(&events);
301 * test__switch_tracking - test using sched_switch and tracking events.
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.
308 int test__switch_tracking(int subtest __maybe_unused)
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,
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;
329 threads = thread_map__new(-1, getpid(), UINT_MAX);
331 pr_debug("thread_map__new failed!\n");
335 cpus = cpu_map__new(NULL);
337 pr_debug("cpu_map__new failed!\n");
341 evlist = perf_evlist__new();
343 pr_debug("perf_evlist__new failed!\n");
347 perf_evlist__set_maps(evlist, cpus, threads);
350 err = parse_events(evlist, "cpu-clock:u", NULL);
352 pr_debug("Failed to parse event dummy:u\n");
356 cpu_clocks_evsel = perf_evlist__last(evlist);
359 err = parse_events(evlist, "cycles:u", NULL);
361 pr_debug("Failed to parse event cycles:u\n");
365 cycles_evsel = perf_evlist__last(evlist);
368 if (!perf_evlist__can_select_event(evlist, sched_switch)) {
369 pr_debug("No sched_switch\n");
374 err = parse_events(evlist, sched_switch, NULL);
376 pr_debug("Failed to parse event %s\n", sched_switch);
380 switch_evsel = perf_evlist__last(evlist);
382 perf_evsel__set_sample_bit(switch_evsel, CPU);
383 perf_evsel__set_sample_bit(switch_evsel, TIME);
385 switch_evsel->system_wide = true;
386 switch_evsel->no_aux_samples = true;
387 switch_evsel->immediate = true;
389 /* Test moving an event to the front */
390 if (cycles_evsel == perf_evlist__first(evlist)) {
391 pr_debug("cycles event already at front");
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");
400 perf_evsel__set_sample_bit(cycles_evsel, CPU);
401 perf_evsel__set_sample_bit(cycles_evsel, TIME);
404 err = parse_events(evlist, "dummy:u", NULL);
406 pr_debug("Failed to parse event dummy:u\n");
410 tracking_evsel = perf_evlist__last(evlist);
412 perf_evlist__set_tracking_event(evlist, tracking_evsel);
414 tracking_evsel->attr.freq = 0;
415 tracking_evsel->attr.sample_period = 1;
417 perf_evsel__set_sample_bit(tracking_evsel, TIME);
420 perf_evlist__config(evlist, &opts);
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");
428 /* Check tracking event is tracking */
429 if (!tracking_evsel->attr.mmap || !tracking_evsel->attr.comm) {
430 pr_debug("Tracking event not tracking\n");
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");
444 if (perf_evlist__open(evlist) < 0) {
445 pr_debug("Not supported\n");
450 err = perf_evlist__mmap(evlist, UINT_MAX, false);
452 pr_debug("perf_evlist__mmap failed!\n");
456 perf_evlist__enable(evlist);
458 err = perf_evsel__disable(cpu_clocks_evsel);
460 pr_debug("perf_evlist__disable_event failed!\n");
466 pr_debug("spin_sleep failed!\n");
470 comm = "Test COMM 1";
471 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
473 pr_debug("PR_SET_NAME failed!\n");
477 err = perf_evsel__disable(cycles_evsel);
479 pr_debug("perf_evlist__disable_event failed!\n");
483 comm = "Test COMM 2";
484 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
486 pr_debug("PR_SET_NAME failed!\n");
492 pr_debug("spin_sleep failed!\n");
496 comm = "Test COMM 3";
497 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
499 pr_debug("PR_SET_NAME failed!\n");
503 err = perf_evsel__enable(cycles_evsel);
505 pr_debug("perf_evlist__disable_event failed!\n");
509 comm = "Test COMM 4";
510 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
512 pr_debug("PR_SET_NAME failed!\n");
518 pr_debug("spin_sleep failed!\n");
522 perf_evlist__disable(evlist);
524 switch_tracking.switch_evsel = switch_evsel;
525 switch_tracking.cycles_evsel = cycles_evsel;
527 err = process_events(evlist, &switch_tracking);
529 zfree(&switch_tracking.tids);
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");
541 /* Check cycles event got enabled */
542 if (!switch_tracking.cycles_before_comm_1) {
543 pr_debug("Missing cycles events\n");
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");
553 /* Check cycles event got enabled again */
554 if (!switch_tracking.cycles_after_comm_4) {
555 pr_debug("Missing cycles events\n");
560 perf_evlist__disable(evlist);
561 perf_evlist__delete(evlist);
564 thread_map__put(threads);