1 // SPDX-License-Identifier: GPL-2.0
7 #include <linux/zalloc.h>
8 #include <perf/cpumap.h>
9 #include <perf/evlist.h>
11 #include "parse-events.h"
14 #include "thread_map.h"
18 static int spin_sleep(void)
20 struct timeval start, now, diff, maxtime;
25 maxtime.tv_usec = 50000;
27 err = gettimeofday(&start, NULL);
33 for (i = 0; i < 1000; i++)
36 err = gettimeofday(&now, NULL);
40 timersub(&now, &start, &diff);
41 if (timercmp(&diff, &maxtime, > /* For checkpatch */))
45 ts.tv_nsec = 50 * 1000 * 1000;
49 err = nanosleep(&ts, NULL);
56 struct switch_tracking {
57 struct evsel *switch_evsel;
58 struct evsel *cycles_evsel;
62 int cycles_before_comm_1;
63 int cycles_between_comm_2_and_comm_3;
64 int cycles_after_comm_4;
67 static int check_comm(struct switch_tracking *switch_tracking,
68 union perf_event *event, const char *comm, int nr)
70 if (event->header.type == PERF_RECORD_COMM &&
71 (pid_t)event->comm.pid == getpid() &&
72 (pid_t)event->comm.tid == getpid() &&
73 strcmp(event->comm.comm, comm) == 0) {
74 if (switch_tracking->comm_seen[nr]) {
75 pr_debug("Duplicate comm event\n");
78 switch_tracking->comm_seen[nr] = 1;
79 pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
85 static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
92 if (!switch_tracking->tids) {
93 switch_tracking->tids = calloc(nr, sizeof(pid_t));
94 if (!switch_tracking->tids)
96 for (i = 0; i < nr; i++)
97 switch_tracking->tids[i] = -1;
98 switch_tracking->nr_tids = nr;
102 if (cpu >= switch_tracking->nr_tids) {
105 addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
108 switch_tracking->tids = addr;
109 for (i = switch_tracking->nr_tids; i < nr; i++)
110 switch_tracking->tids[i] = -1;
111 switch_tracking->nr_tids = nr;
118 static int process_sample_event(struct evlist *evlist,
119 union perf_event *event,
120 struct switch_tracking *switch_tracking)
122 struct perf_sample sample;
124 pid_t next_tid, prev_tid;
127 if (perf_evlist__parse_sample(evlist, event, &sample)) {
128 pr_debug("perf_evlist__parse_sample failed\n");
132 evsel = perf_evlist__id2evsel(evlist, sample.id);
133 if (evsel == switch_tracking->switch_evsel) {
134 next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
135 prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
137 pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
138 cpu, prev_tid, next_tid);
139 err = check_cpu(switch_tracking, cpu);
143 * Check for no missing sched_switch events i.e. that the
144 * evsel->system_wide flag has worked.
146 if (switch_tracking->tids[cpu] != -1 &&
147 switch_tracking->tids[cpu] != prev_tid) {
148 pr_debug("Missing sched_switch events\n");
151 switch_tracking->tids[cpu] = next_tid;
154 if (evsel == switch_tracking->cycles_evsel) {
155 pr_debug3("cycles event\n");
156 if (!switch_tracking->comm_seen[0])
157 switch_tracking->cycles_before_comm_1 = 1;
158 if (switch_tracking->comm_seen[1] &&
159 !switch_tracking->comm_seen[2])
160 switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
161 if (switch_tracking->comm_seen[3])
162 switch_tracking->cycles_after_comm_4 = 1;
168 static int process_event(struct evlist *evlist, union perf_event *event,
169 struct switch_tracking *switch_tracking)
171 if (event->header.type == PERF_RECORD_SAMPLE)
172 return process_sample_event(evlist, event, switch_tracking);
174 if (event->header.type == PERF_RECORD_COMM) {
177 err = check_comm(switch_tracking, event, "Test COMM 1", 0);
181 err = check_comm(switch_tracking, event, "Test COMM 2", 1);
185 err = check_comm(switch_tracking, event, "Test COMM 3", 2);
189 err = check_comm(switch_tracking, event, "Test COMM 4", 3);
194 pr_debug("Unexpected comm event\n");
203 struct list_head list;
204 union perf_event *event;
208 static int add_event(struct evlist *evlist, struct list_head *events,
209 union perf_event *event)
211 struct perf_sample sample;
212 struct event_node *node;
214 node = malloc(sizeof(struct event_node));
216 pr_debug("malloc failed\n");
220 list_add(&node->list, events);
222 if (perf_evlist__parse_sample(evlist, event, &sample)) {
223 pr_debug("perf_evlist__parse_sample failed\n");
228 pr_debug("event with no time\n");
232 node->event_time = sample.time;
237 static void free_event_nodes(struct list_head *events)
239 struct event_node *node;
241 while (!list_empty(events)) {
242 node = list_entry(events->next, struct event_node, list);
243 list_del_init(&node->list);
248 static int compar(const void *a, const void *b)
250 const struct event_node *nodea = a;
251 const struct event_node *nodeb = b;
252 s64 cmp = nodea->event_time - nodeb->event_time;
257 static int process_events(struct evlist *evlist,
258 struct switch_tracking *switch_tracking)
260 union perf_event *event;
261 unsigned pos, cnt = 0;
263 struct event_node *events_array, *node;
264 struct perf_mmap *md;
267 for (i = 0; i < evlist->nr_mmaps; i++) {
268 md = &evlist->mmap[i];
269 if (perf_mmap__read_init(md) < 0)
272 while ((event = perf_mmap__read_event(md)) != NULL) {
274 ret = add_event(evlist, &events, event);
275 perf_mmap__consume(md);
279 perf_mmap__read_done(md);
282 events_array = calloc(cnt, sizeof(struct event_node));
284 pr_debug("calloc failed\n");
290 list_for_each_entry(node, &events, list)
291 events_array[pos++] = *node;
293 qsort(events_array, cnt, sizeof(struct event_node), compar);
295 for (pos = 0; pos < cnt; pos++) {
296 ret = process_event(evlist, events_array[pos].event,
304 pr_debug("%u events recorded\n", cnt);
307 free_event_nodes(&events);
312 * test__switch_tracking - test using sched_switch and tracking events.
314 * This function implements a test that checks that sched_switch events and
315 * tracking events can be recorded for a workload (current process) using the
316 * evsel->system_wide and evsel->tracking flags (respectively) with other events
317 * sometimes enabled or disabled.
319 int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
321 const char *sched_switch = "sched:sched_switch";
322 struct switch_tracking switch_tracking = { .tids = NULL, };
323 struct record_opts opts = {
324 .mmap_pages = UINT_MAX,
325 .user_freq = UINT_MAX,
326 .user_interval = ULLONG_MAX,
332 struct perf_thread_map *threads = NULL;
333 struct perf_cpu_map *cpus = NULL;
334 struct evlist *evlist = NULL;
335 struct evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
336 struct evsel *switch_evsel, *tracking_evsel;
340 threads = thread_map__new(-1, getpid(), UINT_MAX);
342 pr_debug("thread_map__new failed!\n");
346 cpus = perf_cpu_map__new(NULL);
348 pr_debug("perf_cpu_map__new failed!\n");
352 evlist = evlist__new();
354 pr_debug("evlist__new failed!\n");
358 perf_evlist__set_maps(&evlist->core, cpus, threads);
361 err = parse_events(evlist, "cpu-clock:u", NULL);
363 pr_debug("Failed to parse event dummy:u\n");
367 cpu_clocks_evsel = perf_evlist__last(evlist);
370 err = parse_events(evlist, "cycles:u", NULL);
372 pr_debug("Failed to parse event cycles:u\n");
376 cycles_evsel = perf_evlist__last(evlist);
379 if (!perf_evlist__can_select_event(evlist, sched_switch)) {
380 pr_debug("No sched_switch\n");
385 err = parse_events(evlist, sched_switch, NULL);
387 pr_debug("Failed to parse event %s\n", sched_switch);
391 switch_evsel = perf_evlist__last(evlist);
393 perf_evsel__set_sample_bit(switch_evsel, CPU);
394 perf_evsel__set_sample_bit(switch_evsel, TIME);
396 switch_evsel->system_wide = true;
397 switch_evsel->no_aux_samples = true;
398 switch_evsel->immediate = true;
400 /* Test moving an event to the front */
401 if (cycles_evsel == perf_evlist__first(evlist)) {
402 pr_debug("cycles event already at front");
405 perf_evlist__to_front(evlist, cycles_evsel);
406 if (cycles_evsel != perf_evlist__first(evlist)) {
407 pr_debug("Failed to move cycles event to front");
411 perf_evsel__set_sample_bit(cycles_evsel, CPU);
412 perf_evsel__set_sample_bit(cycles_evsel, TIME);
415 err = parse_events(evlist, "dummy:u", NULL);
417 pr_debug("Failed to parse event dummy:u\n");
421 tracking_evsel = perf_evlist__last(evlist);
423 perf_evlist__set_tracking_event(evlist, tracking_evsel);
425 tracking_evsel->core.attr.freq = 0;
426 tracking_evsel->core.attr.sample_period = 1;
428 perf_evsel__set_sample_bit(tracking_evsel, TIME);
431 perf_evlist__config(evlist, &opts, NULL);
433 /* Check moved event is still at the front */
434 if (cycles_evsel != perf_evlist__first(evlist)) {
435 pr_debug("Front event no longer at front");
439 /* Check tracking event is tracking */
440 if (!tracking_evsel->core.attr.mmap || !tracking_evsel->core.attr.comm) {
441 pr_debug("Tracking event not tracking\n");
445 /* Check non-tracking events are not tracking */
446 evlist__for_each_entry(evlist, evsel) {
447 if (evsel != tracking_evsel) {
448 if (evsel->core.attr.mmap || evsel->core.attr.comm) {
449 pr_debug("Non-tracking event is tracking\n");
455 if (evlist__open(evlist) < 0) {
456 pr_debug("Not supported\n");
461 err = perf_evlist__mmap(evlist, UINT_MAX);
463 pr_debug("perf_evlist__mmap failed!\n");
467 evlist__enable(evlist);
469 err = evsel__disable(cpu_clocks_evsel);
471 pr_debug("perf_evlist__disable_event failed!\n");
477 pr_debug("spin_sleep failed!\n");
481 comm = "Test COMM 1";
482 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
484 pr_debug("PR_SET_NAME failed!\n");
488 err = evsel__disable(cycles_evsel);
490 pr_debug("perf_evlist__disable_event failed!\n");
494 comm = "Test COMM 2";
495 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
497 pr_debug("PR_SET_NAME failed!\n");
503 pr_debug("spin_sleep failed!\n");
507 comm = "Test COMM 3";
508 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
510 pr_debug("PR_SET_NAME failed!\n");
514 err = evsel__enable(cycles_evsel);
516 pr_debug("perf_evlist__disable_event failed!\n");
520 comm = "Test COMM 4";
521 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
523 pr_debug("PR_SET_NAME failed!\n");
529 pr_debug("spin_sleep failed!\n");
533 evlist__disable(evlist);
535 switch_tracking.switch_evsel = switch_evsel;
536 switch_tracking.cycles_evsel = cycles_evsel;
538 err = process_events(evlist, &switch_tracking);
540 zfree(&switch_tracking.tids);
545 /* Check all 4 comm events were seen i.e. that evsel->tracking works */
546 if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
547 !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
548 pr_debug("Missing comm events\n");
552 /* Check cycles event got enabled */
553 if (!switch_tracking.cycles_before_comm_1) {
554 pr_debug("Missing cycles events\n");
558 /* Check cycles event got disabled */
559 if (switch_tracking.cycles_between_comm_2_and_comm_3) {
560 pr_debug("cycles events even though event was disabled\n");
564 /* Check cycles event got enabled again */
565 if (!switch_tracking.cycles_after_comm_4) {
566 pr_debug("Missing cycles events\n");
571 evlist__disable(evlist);
572 evlist__delete(evlist);
574 perf_cpu_map__put(cpus);
575 perf_thread_map__put(threads);