1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/zalloc.h>
9 #include <perf/cpumap.h>
10 #include <perf/evlist.h>
13 #include "parse-events.h"
16 #include "thread_map.h"
19 #include "util/mmap.h"
21 static int spin_sleep(void)
23 struct timeval start, now, diff, maxtime;
28 maxtime.tv_usec = 50000;
30 err = gettimeofday(&start, NULL);
36 for (i = 0; i < 1000; i++)
39 err = gettimeofday(&now, NULL);
43 timersub(&now, &start, &diff);
44 if (timercmp(&diff, &maxtime, > /* For checkpatch */))
48 ts.tv_nsec = 50 * 1000 * 1000;
52 err = nanosleep(&ts, NULL);
59 struct switch_tracking {
60 struct evsel *switch_evsel;
61 struct evsel *cycles_evsel;
65 int cycles_before_comm_1;
66 int cycles_between_comm_2_and_comm_3;
67 int cycles_after_comm_4;
70 static int check_comm(struct switch_tracking *switch_tracking,
71 union perf_event *event, const char *comm, int nr)
73 if (event->header.type == PERF_RECORD_COMM &&
74 (pid_t)event->comm.pid == getpid() &&
75 (pid_t)event->comm.tid == getpid() &&
76 strcmp(event->comm.comm, comm) == 0) {
77 if (switch_tracking->comm_seen[nr]) {
78 pr_debug("Duplicate comm event\n");
81 switch_tracking->comm_seen[nr] = 1;
82 pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
88 static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
95 if (!switch_tracking->tids) {
96 switch_tracking->tids = calloc(nr, sizeof(pid_t));
97 if (!switch_tracking->tids)
99 for (i = 0; i < nr; i++)
100 switch_tracking->tids[i] = -1;
101 switch_tracking->nr_tids = nr;
105 if (cpu >= switch_tracking->nr_tids) {
108 addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
111 switch_tracking->tids = addr;
112 for (i = switch_tracking->nr_tids; i < nr; i++)
113 switch_tracking->tids[i] = -1;
114 switch_tracking->nr_tids = nr;
121 static int process_sample_event(struct evlist *evlist,
122 union perf_event *event,
123 struct switch_tracking *switch_tracking)
125 struct perf_sample sample;
127 pid_t next_tid, prev_tid;
130 if (perf_evlist__parse_sample(evlist, event, &sample)) {
131 pr_debug("perf_evlist__parse_sample failed\n");
135 evsel = perf_evlist__id2evsel(evlist, sample.id);
136 if (evsel == switch_tracking->switch_evsel) {
137 next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
138 prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
140 pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
141 cpu, prev_tid, next_tid);
142 err = check_cpu(switch_tracking, cpu);
146 * Check for no missing sched_switch events i.e. that the
147 * evsel->core.system_wide flag has worked.
149 if (switch_tracking->tids[cpu] != -1 &&
150 switch_tracking->tids[cpu] != prev_tid) {
151 pr_debug("Missing sched_switch events\n");
154 switch_tracking->tids[cpu] = next_tid;
157 if (evsel == switch_tracking->cycles_evsel) {
158 pr_debug3("cycles event\n");
159 if (!switch_tracking->comm_seen[0])
160 switch_tracking->cycles_before_comm_1 = 1;
161 if (switch_tracking->comm_seen[1] &&
162 !switch_tracking->comm_seen[2])
163 switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
164 if (switch_tracking->comm_seen[3])
165 switch_tracking->cycles_after_comm_4 = 1;
171 static int process_event(struct evlist *evlist, union perf_event *event,
172 struct switch_tracking *switch_tracking)
174 if (event->header.type == PERF_RECORD_SAMPLE)
175 return process_sample_event(evlist, event, switch_tracking);
177 if (event->header.type == PERF_RECORD_COMM) {
180 err = check_comm(switch_tracking, event, "Test COMM 1", 0);
184 err = check_comm(switch_tracking, event, "Test COMM 2", 1);
188 err = check_comm(switch_tracking, event, "Test COMM 3", 2);
192 err = check_comm(switch_tracking, event, "Test COMM 4", 3);
197 pr_debug("Unexpected comm event\n");
206 struct list_head list;
207 union perf_event *event;
211 static int add_event(struct evlist *evlist, struct list_head *events,
212 union perf_event *event)
214 struct perf_sample sample;
215 struct event_node *node;
217 node = malloc(sizeof(struct event_node));
219 pr_debug("malloc failed\n");
223 list_add(&node->list, events);
225 if (perf_evlist__parse_sample(evlist, event, &sample)) {
226 pr_debug("perf_evlist__parse_sample failed\n");
231 pr_debug("event with no time\n");
235 node->event_time = sample.time;
240 static void free_event_nodes(struct list_head *events)
242 struct event_node *node;
244 while (!list_empty(events)) {
245 node = list_entry(events->next, struct event_node, list);
246 list_del_init(&node->list);
251 static int compar(const void *a, const void *b)
253 const struct event_node *nodea = a;
254 const struct event_node *nodeb = b;
255 s64 cmp = nodea->event_time - nodeb->event_time;
260 static int process_events(struct evlist *evlist,
261 struct switch_tracking *switch_tracking)
263 union perf_event *event;
264 unsigned pos, cnt = 0;
266 struct event_node *events_array, *node;
270 for (i = 0; i < evlist->core.nr_mmaps; i++) {
271 md = &evlist->mmap[i];
272 if (perf_mmap__read_init(md) < 0)
275 while ((event = perf_mmap__read_event(md)) != NULL) {
277 ret = add_event(evlist, &events, event);
278 perf_mmap__consume(md);
282 perf_mmap__read_done(md);
285 events_array = calloc(cnt, sizeof(struct event_node));
287 pr_debug("calloc failed\n");
293 list_for_each_entry(node, &events, list)
294 events_array[pos++] = *node;
296 qsort(events_array, cnt, sizeof(struct event_node), compar);
298 for (pos = 0; pos < cnt; pos++) {
299 ret = process_event(evlist, events_array[pos].event,
307 pr_debug("%u events recorded\n", cnt);
310 free_event_nodes(&events);
315 * test__switch_tracking - test using sched_switch and tracking events.
317 * This function implements a test that checks that sched_switch events and
318 * tracking events can be recorded for a workload (current process) using the
319 * evsel->core.system_wide and evsel->tracking flags (respectively) with other events
320 * sometimes enabled or disabled.
322 int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
324 const char *sched_switch = "sched:sched_switch";
325 struct switch_tracking switch_tracking = { .tids = NULL, };
326 struct record_opts opts = {
327 .mmap_pages = UINT_MAX,
328 .user_freq = UINT_MAX,
329 .user_interval = ULLONG_MAX,
335 struct perf_thread_map *threads = NULL;
336 struct perf_cpu_map *cpus = NULL;
337 struct evlist *evlist = NULL;
338 struct evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
339 struct evsel *switch_evsel, *tracking_evsel;
343 threads = thread_map__new(-1, getpid(), UINT_MAX);
345 pr_debug("thread_map__new failed!\n");
349 cpus = perf_cpu_map__new(NULL);
351 pr_debug("perf_cpu_map__new failed!\n");
355 evlist = evlist__new();
357 pr_debug("evlist__new failed!\n");
361 perf_evlist__set_maps(&evlist->core, cpus, threads);
364 err = parse_events(evlist, "cpu-clock:u", NULL);
366 pr_debug("Failed to parse event dummy:u\n");
370 cpu_clocks_evsel = evlist__last(evlist);
373 err = parse_events(evlist, "cycles:u", NULL);
375 pr_debug("Failed to parse event cycles:u\n");
379 cycles_evsel = evlist__last(evlist);
382 if (!perf_evlist__can_select_event(evlist, sched_switch)) {
383 pr_debug("No sched_switch\n");
388 err = parse_events(evlist, sched_switch, NULL);
390 pr_debug("Failed to parse event %s\n", sched_switch);
394 switch_evsel = evlist__last(evlist);
396 perf_evsel__set_sample_bit(switch_evsel, CPU);
397 perf_evsel__set_sample_bit(switch_evsel, TIME);
399 switch_evsel->core.system_wide = true;
400 switch_evsel->no_aux_samples = true;
401 switch_evsel->immediate = true;
403 /* Test moving an event to the front */
404 if (cycles_evsel == evlist__first(evlist)) {
405 pr_debug("cycles event already at front");
408 perf_evlist__to_front(evlist, cycles_evsel);
409 if (cycles_evsel != evlist__first(evlist)) {
410 pr_debug("Failed to move cycles event to front");
414 perf_evsel__set_sample_bit(cycles_evsel, CPU);
415 perf_evsel__set_sample_bit(cycles_evsel, TIME);
418 err = parse_events(evlist, "dummy:u", NULL);
420 pr_debug("Failed to parse event dummy:u\n");
424 tracking_evsel = evlist__last(evlist);
426 perf_evlist__set_tracking_event(evlist, tracking_evsel);
428 tracking_evsel->core.attr.freq = 0;
429 tracking_evsel->core.attr.sample_period = 1;
431 perf_evsel__set_sample_bit(tracking_evsel, TIME);
434 perf_evlist__config(evlist, &opts, NULL);
436 /* Check moved event is still at the front */
437 if (cycles_evsel != evlist__first(evlist)) {
438 pr_debug("Front event no longer at front");
442 /* Check tracking event is tracking */
443 if (!tracking_evsel->core.attr.mmap || !tracking_evsel->core.attr.comm) {
444 pr_debug("Tracking event not tracking\n");
448 /* Check non-tracking events are not tracking */
449 evlist__for_each_entry(evlist, evsel) {
450 if (evsel != tracking_evsel) {
451 if (evsel->core.attr.mmap || evsel->core.attr.comm) {
452 pr_debug("Non-tracking event is tracking\n");
458 if (evlist__open(evlist) < 0) {
459 pr_debug("Not supported\n");
464 err = evlist__mmap(evlist, UINT_MAX);
466 pr_debug("evlist__mmap failed!\n");
470 evlist__enable(evlist);
472 err = evsel__disable(cpu_clocks_evsel);
474 pr_debug("perf_evlist__disable_event failed!\n");
480 pr_debug("spin_sleep failed!\n");
484 comm = "Test COMM 1";
485 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
487 pr_debug("PR_SET_NAME failed!\n");
491 err = evsel__disable(cycles_evsel);
493 pr_debug("perf_evlist__disable_event failed!\n");
497 comm = "Test COMM 2";
498 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
500 pr_debug("PR_SET_NAME failed!\n");
506 pr_debug("spin_sleep failed!\n");
510 comm = "Test COMM 3";
511 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
513 pr_debug("PR_SET_NAME failed!\n");
517 err = evsel__enable(cycles_evsel);
519 pr_debug("perf_evlist__disable_event failed!\n");
523 comm = "Test COMM 4";
524 err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
526 pr_debug("PR_SET_NAME failed!\n");
532 pr_debug("spin_sleep failed!\n");
536 evlist__disable(evlist);
538 switch_tracking.switch_evsel = switch_evsel;
539 switch_tracking.cycles_evsel = cycles_evsel;
541 err = process_events(evlist, &switch_tracking);
543 zfree(&switch_tracking.tids);
548 /* Check all 4 comm events were seen i.e. that evsel->tracking works */
549 if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
550 !switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
551 pr_debug("Missing comm events\n");
555 /* Check cycles event got enabled */
556 if (!switch_tracking.cycles_before_comm_1) {
557 pr_debug("Missing cycles events\n");
561 /* Check cycles event got disabled */
562 if (switch_tracking.cycles_between_comm_2_and_comm_3) {
563 pr_debug("cycles events even though event was disabled\n");
567 /* Check cycles event got enabled again */
568 if (!switch_tracking.cycles_after_comm_4) {
569 pr_debug("Missing cycles events\n");
574 evlist__disable(evlist);
575 evlist__delete(evlist);
577 perf_cpu_map__put(cpus);
578 perf_thread_map__put(threads);