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Linux/tools/perf/tests/switch-tracking.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <sys/time.h>
  3 #include <sys/prctl.h>
  4 #include <errno.h>
  5 #include <time.h>
  6 #include <stdlib.h>
  7 #include <linux/zalloc.h>
  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 {
 55         struct perf_evsel *switch_evsel;
 56         struct perf_evsel *cycles_evsel;
 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 
116 static int process_sample_event(struct perf_evlist *evlist,
117                                 union perf_event *event,
118                                 struct switch_tracking *switch_tracking)
119 {
120         struct perf_sample sample;
121         struct perf_evsel *evsel;
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 
166 static int process_event(struct perf_evlist *evlist, union perf_event *event,
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 
206 static int add_event(struct perf_evlist *evlist, struct list_head *events,
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);
241                 list_del_init(&node->list);
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 
255 static int process_events(struct perf_evlist *evlist,
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;
262         struct perf_mmap *md;
263         int i, ret;
264 
265         for (i = 0; i < evlist->nr_mmaps; i++) {
266                 md = &evlist->mmap[i];
267                 if (perf_mmap__read_init(md) < 0)
268                         continue;
269 
270                 while ((event = perf_mmap__read_event(md)) != NULL) {
271                         cnt += 1;
272                         ret = add_event(evlist, &events, event);
273                          perf_mmap__consume(md);
274                         if (ret < 0)
275                                 goto out_free_nodes;
276                 }
277                 perf_mmap__read_done(md);
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  */
317 int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
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         };
330         struct thread_map *threads = NULL;
331         struct cpu_map *cpus = NULL;
332         struct perf_evlist *evlist = NULL;
333         struct perf_evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
334         struct perf_evsel *switch_evsel, *tracking_evsel;
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 
350         evlist = perf_evlist__new();
351         if (!evlist) {
352                 pr_debug("perf_evlist__new failed!\n");
353                 goto out_err;
354         }
355 
356         perf_evlist__set_maps(evlist, cpus, threads);
357 
358         /* First event */
359         err = parse_events(evlist, "cpu-clock:u", NULL);
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 */
368         err = parse_events(evlist, "cycles:u", NULL);
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)) {
378                 pr_debug("No sched_switch\n");
379                 err = 0;
380                 goto out;
381         }
382 
383         err = parse_events(evlist, sched_switch, NULL);
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 */
413         err = parse_events(evlist, "dummy:u", NULL);
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 */
429         perf_evlist__config(evlist, &opts, NULL);
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 */
444         evlist__for_each_entry(evlist, evsel) {
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 
453         if (perf_evlist__open(evlist) < 0) {
454                 pr_debug("Not supported\n");
455                 err = 0;
456                 goto out;
457         }
458 
459         err = perf_evlist__mmap(evlist, UINT_MAX);
460         if (err) {
461                 pr_debug("perf_evlist__mmap failed!\n");
462                 goto out_err;
463         }
464 
465         perf_evlist__enable(evlist);
466 
467         err = perf_evsel__disable(cpu_clocks_evsel);
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 
486         err = perf_evsel__disable(cycles_evsel);
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 
512         err = perf_evsel__enable(cycles_evsel);
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 
531         perf_evlist__disable(evlist);
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) {
569                 perf_evlist__disable(evlist);
570                 perf_evlist__delete(evlist);
571         } else {
572                 cpu_map__put(cpus);
573                 thread_map__put(threads);
574         }
575 
576         return err;
577 
578 out_err:
579         err = -1;
580         goto out;
581 }
582 

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