1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/zalloc.h>
9 #include <perf/cpumap.h>
10 #include <perf/evlist.h>
11 #include <perf/mmap.h>
14 #include "parse-events.h"
17 #include "thread_map.h"
20 #include "util/mmap.h"
22 static int spin_sleep(void)
24 struct timeval start, now, diff, maxtime;
29 maxtime.tv_usec = 50000;
31 err = gettimeofday(&start, NULL);
37 for (i = 0; i < 1000; i++)
40 err = gettimeofday(&now, NULL);
44 timersub(&now, &start, &diff);
45 if (timercmp(&diff, &maxtime, > /* For checkpatch */))
49 ts.tv_nsec = 50 * 1000 * 1000;
53 err = nanosleep(&ts, NULL);
60 struct switch_tracking {
61 struct evsel *switch_evsel;
62 struct evsel *cycles_evsel;
66 int cycles_before_comm_1;
67 int cycles_between_comm_2_and_comm_3;
68 int cycles_after_comm_4;
71 static int check_comm(struct switch_tracking *switch_tracking,
72 union perf_event *event, const char *comm, int nr)
74 if (event->header.type == PERF_RECORD_COMM &&
75 (pid_t)event->comm.pid == getpid() &&
76 (pid_t)event->comm.tid == getpid() &&
77 strcmp(event->comm.comm, comm) == 0) {
78 if (switch_tracking->comm_seen[nr]) {
79 pr_debug("Duplicate comm event\n");
82 switch_tracking->comm_seen[nr] = 1;
83 pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
89 static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
96 if (!switch_tracking->tids) {
97 switch_tracking->tids = calloc(nr, sizeof(pid_t));
98 if (!switch_tracking->tids)
100 for (i = 0; i < nr; i++)
101 switch_tracking->tids[i] = -1;
102 switch_tracking->nr_tids = nr;
106 if (cpu >= switch_tracking->nr_tids) {
109 addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
112 switch_tracking->tids = addr;
113 for (i = switch_tracking->nr_tids; i < nr; i++)
114 switch_tracking->tids[i] = -1;
115 switch_tracking->nr_tids = nr;
122 static int process_sample_event(struct evlist *evlist,
123 union perf_event *event,
124 struct switch_tracking *switch_tracking)
126 struct perf_sample sample;
128 pid_t next_tid, prev_tid;
131 if (perf_evlist__parse_sample(evlist, event, &sample)) {
132 pr_debug("perf_evlist__parse_sample failed\n");
136 evsel = perf_evlist__id2evsel(evlist, sample.id);
137 if (evsel == switch_tracking->switch_evsel) {
138 next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
139 prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
141 pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
142 cpu, prev_tid, next_tid);
143 err = check_cpu(switch_tracking, cpu);
147 * Check for no missing sched_switch events i.e. that the
148 * evsel->core.system_wide flag has worked.
150 if (switch_tracking->tids[cpu] != -1 &&
151 switch_tracking->tids[cpu] != prev_tid) {
152 pr_debug("Missing sched_switch events\n");
155 switch_tracking->tids[cpu] = next_tid;
158 if (evsel == switch_tracking->cycles_evsel) {
159 pr_debug3("cycles event\n");
160 if (!switch_tracking->comm_seen[0])
161 switch_tracking->cycles_before_comm_1 = 1;
162 if (switch_tracking->comm_seen[1] &&
163 !switch_tracking->comm_seen[2])
164 switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
165 if (switch_tracking->comm_seen[3])
166 switch_tracking->cycles_after_comm_4 = 1;
172 static int process_event(struct evlist *evlist, union perf_event *event,
173 struct switch_tracking *switch_tracking)
175 if (event->header.type == PERF_RECORD_SAMPLE)
176 return process_sample_event(evlist, event, switch_tracking);
178 if (event->header.type == PERF_RECORD_COMM) {
181 err = check_comm(switch_tracking, event, "Test COMM 1", 0);
185 err = check_comm(switch_tracking, event, "Test COMM 2", 1);
189 err = check_comm(switch_tracking, event, "Test COMM 3", 2);
193 err = check_comm(switch_tracking, event, "Test COMM 4", 3);
198 pr_debug("Unexpected comm event\n");
207 struct list_head list;
208 union perf_event *event;
212 static int add_event(struct evlist *evlist, struct list_head *events,
213 union perf_event *event)
215 struct perf_sample sample;
216 struct event_node *node;
218 node = malloc(sizeof(struct event_node));
220 pr_debug("malloc failed\n");
224 list_add(&node->list, events);
226 if (perf_evlist__parse_sample(evlist, event, &sample)) {
227 pr_debug("perf_evlist__parse_sample failed\n");
232 pr_debug("event with no time\n");
236 node->event_time = sample.time;
241 static void free_event_nodes(struct list_head *events)
243 struct event_node *node;
245 while (!list_empty(events)) {
246 node = list_entry(events->next, struct event_node, list);
247 list_del_init(&node->list);
252 static int compar(const void *a, const void *b)
254 const struct event_node *nodea = a;
255 const struct event_node *nodeb = b;
256 s64 cmp = nodea->event_time - nodeb->event_time;
261 static int process_events(struct evlist *evlist,
262 struct switch_tracking *switch_tracking)
264 union perf_event *event;
265 unsigned pos, cnt = 0;
267 struct event_node *events_array, *node;
271 for (i = 0; i < evlist->core.nr_mmaps; i++) {
272 md = &evlist->mmap[i];
273 if (perf_mmap__read_init(&md->core) < 0)
276 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
278 ret = add_event(evlist, &events, event);
279 perf_mmap__consume(&md->core);
283 perf_mmap__read_done(&md->core);
286 events_array = calloc(cnt, sizeof(struct event_node));
288 pr_debug("calloc failed\n");
294 list_for_each_entry(node, &events, list)
295 events_array[pos++] = *node;
297 qsort(events_array, cnt, sizeof(struct event_node), compar);
299 for (pos = 0; pos < cnt; pos++) {
300 ret = process_event(evlist, events_array[pos].event,
308 pr_debug("%u events recorded\n", cnt);
311 free_event_nodes(&events);
316 * test__switch_tracking - test using sched_switch and tracking events.
318 * This function implements a test that checks that sched_switch events and
319 * tracking events can be recorded for a workload (current process) using the
320 * evsel->core.system_wide and evsel->tracking flags (respectively) with other events
321 * sometimes enabled or disabled.
323 int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
325 const char *sched_switch = "sched:sched_switch";
326 struct switch_tracking switch_tracking = { .tids = NULL, };
327 struct record_opts opts = {
328 .mmap_pages = UINT_MAX,
329 .user_freq = UINT_MAX,
330 .user_interval = ULLONG_MAX,
336 struct perf_thread_map *threads = NULL;
337 struct perf_cpu_map *cpus = NULL;
338 struct evlist *evlist = NULL;
339 struct evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
340 struct evsel *switch_evsel, *tracking_evsel;
344 threads = thread_map__new(-1, getpid(), UINT_MAX);
346 pr_debug("thread_map__new failed!\n");
350 cpus = perf_cpu_map__new(NULL);
352 pr_debug("perf_cpu_map__new failed!\n");
356 evlist = evlist__new();
358 pr_debug("evlist__new failed!\n");
362 perf_evlist__set_maps(&evlist->core, cpus, threads);
365 err = parse_events(evlist, "cpu-clock:u", NULL);
367 pr_debug("Failed to parse event dummy:u\n");
371 cpu_clocks_evsel = evlist__last(evlist);
374 err = parse_events(evlist, "cycles:u", NULL);
376 pr_debug("Failed to parse event cycles:u\n");
380 cycles_evsel = evlist__last(evlist);
383 if (!perf_evlist__can_select_event(evlist, sched_switch)) {
384 pr_debug("No sched_switch\n");
389 err = parse_events(evlist, sched_switch, NULL);
391 pr_debug("Failed to parse event %s\n", sched_switch);
395 switch_evsel = evlist__last(evlist);
397 perf_evsel__set_sample_bit(switch_evsel, CPU);
398 perf_evsel__set_sample_bit(switch_evsel, TIME);
400 switch_evsel->core.system_wide = true;
401 switch_evsel->no_aux_samples = true;
402 switch_evsel->immediate = true;
404 /* Test moving an event to the front */
405 if (cycles_evsel == evlist__first(evlist)) {
406 pr_debug("cycles event already at front");
409 perf_evlist__to_front(evlist, cycles_evsel);
410 if (cycles_evsel != evlist__first(evlist)) {
411 pr_debug("Failed to move cycles event to front");
415 perf_evsel__set_sample_bit(cycles_evsel, CPU);
416 perf_evsel__set_sample_bit(cycles_evsel, TIME);
419 err = parse_events(evlist, "dummy:u", NULL);
421 pr_debug("Failed to parse event dummy:u\n");
425 tracking_evsel = evlist__last(evlist);
427 perf_evlist__set_tracking_event(evlist, tracking_evsel);
429 tracking_evsel->core.attr.freq = 0;
430 tracking_evsel->core.attr.sample_period = 1;
432 perf_evsel__set_sample_bit(tracking_evsel, TIME);
435 perf_evlist__config(evlist, &opts, NULL);
437 /* Check moved event is still at the front */
438 if (cycles_evsel != evlist__first(evlist)) {
439 pr_debug("Front event no longer at front");
443 /* Check tracking event is tracking */
444 if (!tracking_evsel->core.attr.mmap || !tracking_evsel->core.attr.comm) {
445 pr_debug("Tracking event not tracking\n");
449 /* Check non-tracking events are not tracking */
450 evlist__for_each_entry(evlist, evsel) {
451 if (evsel != tracking_evsel) {
452 if (evsel->core.attr.mmap || evsel->core.attr.comm) {
453 pr_debug("Non-tracking event is tracking\n");
459 if (evlist__open(evlist) < 0) {
460 pr_debug("Not supported\n");
465 err = evlist__mmap(evlist, UINT_MAX);
467 pr_debug("evlist__mmap failed!\n");
471 evlist__enable(evlist);
473 err = evsel__disable(cpu_clocks_evsel);
475 pr_debug("perf_evlist__disable_event failed!\n");
481 pr_debug("spin_sleep failed!\n");
485 comm = "Test COMM 1";
486 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
488 pr_debug("PR_SET_NAME failed!\n");
492 err = evsel__disable(cycles_evsel);
494 pr_debug("perf_evlist__disable_event failed!\n");
498 comm = "Test COMM 2";
499 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
501 pr_debug("PR_SET_NAME failed!\n");
507 pr_debug("spin_sleep failed!\n");
511 comm = "Test COMM 3";
512 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
514 pr_debug("PR_SET_NAME failed!\n");
518 err = evsel__enable(cycles_evsel);
520 pr_debug("perf_evlist__disable_event failed!\n");
524 comm = "Test COMM 4";
525 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
527 pr_debug("PR_SET_NAME failed!\n");
533 pr_debug("spin_sleep failed!\n");
537 evlist__disable(evlist);
539 switch_tracking.switch_evsel = switch_evsel;
540 switch_tracking.cycles_evsel = cycles_evsel;
542 err = process_events(evlist, &switch_tracking);
544 zfree(&switch_tracking.tids);
549 /* Check all 4 comm events were seen i.e. that evsel->tracking works */
550 if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
551 !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
552 pr_debug("Missing comm events\n");
556 /* Check cycles event got enabled */
557 if (!switch_tracking.cycles_before_comm_1) {
558 pr_debug("Missing cycles events\n");
562 /* Check cycles event got disabled */
563 if (switch_tracking.cycles_between_comm_2_and_comm_3) {
564 pr_debug("cycles events even though event was disabled\n");
568 /* Check cycles event got enabled again */
569 if (!switch_tracking.cycles_after_comm_4) {
570 pr_debug("Missing cycles events\n");
575 evlist__disable(evlist);
576 evlist__delete(evlist);
578 perf_cpu_map__put(cpus);
579 perf_thread_map__put(threads);