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Linux/tools/perf/tests/perf-record.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <errno.h>
  3 #include <inttypes.h>
  4 #include <linux/string.h>
  5 /* For the CLR_() macros */
  6 #include <pthread.h>
  7 
  8 #include <sched.h>
  9 #include <perf/mmap.h>
 10 #include "evlist.h"
 11 #include "evsel.h"
 12 #include "debug.h"
 13 #include "record.h"
 14 #include "tests.h"
 15 #include "util/mmap.h"
 16 
 17 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp)
 18 {
 19         int i, cpu = -1, nrcpus = 1024;
 20 realloc:
 21         CPU_ZERO(maskp);
 22 
 23         if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) {
 24                 if (errno == EINVAL && nrcpus < (1024 << 8)) {
 25                         nrcpus = nrcpus << 2;
 26                         goto realloc;
 27                 }
 28                 perror("sched_getaffinity");
 29                         return -1;
 30         }
 31 
 32         for (i = 0; i < nrcpus; i++) {
 33                 if (CPU_ISSET(i, maskp)) {
 34                         if (cpu == -1)
 35                                 cpu = i;
 36                         else
 37                                 CPU_CLR(i, maskp);
 38                 }
 39         }
 40 
 41         return cpu;
 42 }
 43 
 44 int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unused)
 45 {
 46         struct record_opts opts = {
 47                 .target = {
 48                         .uid = UINT_MAX,
 49                         .uses_mmap = true,
 50                 },
 51                 .no_buffering = true,
 52                 .mmap_pages   = 256,
 53         };
 54         cpu_set_t cpu_mask;
 55         size_t cpu_mask_size = sizeof(cpu_mask);
 56         struct evlist *evlist = perf_evlist__new_dummy();
 57         struct evsel *evsel;
 58         struct perf_sample sample;
 59         const char *cmd = "sleep";
 60         const char *argv[] = { cmd, "1", NULL, };
 61         char *bname, *mmap_filename;
 62         u64 prev_time = 0;
 63         bool found_cmd_mmap = false,
 64              found_coreutils_mmap = false,
 65              found_libc_mmap = false,
 66              found_vdso_mmap = false,
 67              found_ld_mmap = false;
 68         int err = -1, errs = 0, i, wakeups = 0;
 69         u32 cpu;
 70         int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
 71         char sbuf[STRERR_BUFSIZE];
 72 
 73         if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */
 74                 evlist = perf_evlist__new_default();
 75 
 76         if (evlist == NULL) {
 77                 pr_debug("Not enough memory to create evlist\n");
 78                 goto out;
 79         }
 80 
 81         /*
 82          * Create maps of threads and cpus to monitor. In this case
 83          * we start with all threads and cpus (-1, -1) but then in
 84          * perf_evlist__prepare_workload we'll fill in the only thread
 85          * we're monitoring, the one forked there.
 86          */
 87         err = perf_evlist__create_maps(evlist, &opts.target);
 88         if (err < 0) {
 89                 pr_debug("Not enough memory to create thread/cpu maps\n");
 90                 goto out_delete_evlist;
 91         }
 92 
 93         /*
 94          * Prepare the workload in argv[] to run, it'll fork it, and then wait
 95          * for perf_evlist__start_workload() to exec it. This is done this way
 96          * so that we have time to open the evlist (calling sys_perf_event_open
 97          * on all the fds) and then mmap them.
 98          */
 99         err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL);
100         if (err < 0) {
101                 pr_debug("Couldn't run the workload!\n");
102                 goto out_delete_evlist;
103         }
104 
105         /*
106          * Config the evsels, setting attr->comm on the first one, etc.
107          */
108         evsel = evlist__first(evlist);
109         perf_evsel__set_sample_bit(evsel, CPU);
110         perf_evsel__set_sample_bit(evsel, TID);
111         perf_evsel__set_sample_bit(evsel, TIME);
112         perf_evlist__config(evlist, &opts, NULL);
113 
114         err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
115         if (err < 0) {
116                 pr_debug("sched__get_first_possible_cpu: %s\n",
117                          str_error_r(errno, sbuf, sizeof(sbuf)));
118                 goto out_delete_evlist;
119         }
120 
121         cpu = err;
122 
123         /*
124          * So that we can check perf_sample.cpu on all the samples.
125          */
126         if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
127                 pr_debug("sched_setaffinity: %s\n",
128                          str_error_r(errno, sbuf, sizeof(sbuf)));
129                 goto out_delete_evlist;
130         }
131 
132         /*
133          * Call sys_perf_event_open on all the fds on all the evsels,
134          * grouping them if asked to.
135          */
136         err = evlist__open(evlist);
137         if (err < 0) {
138                 pr_debug("perf_evlist__open: %s\n",
139                          str_error_r(errno, sbuf, sizeof(sbuf)));
140                 goto out_delete_evlist;
141         }
142 
143         /*
144          * mmap the first fd on a given CPU and ask for events for the other
145          * fds in the same CPU to be injected in the same mmap ring buffer
146          * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
147          */
148         err = evlist__mmap(evlist, opts.mmap_pages);
149         if (err < 0) {
150                 pr_debug("evlist__mmap: %s\n",
151                          str_error_r(errno, sbuf, sizeof(sbuf)));
152                 goto out_delete_evlist;
153         }
154 
155         /*
156          * Now that all is properly set up, enable the events, they will
157          * count just on workload.pid, which will start...
158          */
159         evlist__enable(evlist);
160 
161         /*
162          * Now!
163          */
164         perf_evlist__start_workload(evlist);
165 
166         while (1) {
167                 int before = total_events;
168 
169                 for (i = 0; i < evlist->core.nr_mmaps; i++) {
170                         union perf_event *event;
171                         struct mmap *md;
172 
173                         md = &evlist->mmap[i];
174                         if (perf_mmap__read_init(&md->core) < 0)
175                                 continue;
176 
177                         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
178                                 const u32 type = event->header.type;
179                                 const char *name = perf_event__name(type);
180 
181                                 ++total_events;
182                                 if (type < PERF_RECORD_MAX)
183                                         nr_events[type]++;
184 
185                                 err = perf_evlist__parse_sample(evlist, event, &sample);
186                                 if (err < 0) {
187                                         if (verbose > 0)
188                                                 perf_event__fprintf(event, stderr);
189                                         pr_debug("Couldn't parse sample\n");
190                                         goto out_delete_evlist;
191                                 }
192 
193                                 if (verbose > 0) {
194                                         pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
195                                         perf_event__fprintf(event, stderr);
196                                 }
197 
198                                 if (prev_time > sample.time) {
199                                         pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
200                                                  name, prev_time, sample.time);
201                                         ++errs;
202                                 }
203 
204                                 prev_time = sample.time;
205 
206                                 if (sample.cpu != cpu) {
207                                         pr_debug("%s with unexpected cpu, expected %d, got %d\n",
208                                                  name, cpu, sample.cpu);
209                                         ++errs;
210                                 }
211 
212                                 if ((pid_t)sample.pid != evlist->workload.pid) {
213                                         pr_debug("%s with unexpected pid, expected %d, got %d\n",
214                                                  name, evlist->workload.pid, sample.pid);
215                                         ++errs;
216                                 }
217 
218                                 if ((pid_t)sample.tid != evlist->workload.pid) {
219                                         pr_debug("%s with unexpected tid, expected %d, got %d\n",
220                                                  name, evlist->workload.pid, sample.tid);
221                                         ++errs;
222                                 }
223 
224                                 if ((type == PERF_RECORD_COMM ||
225                                      type == PERF_RECORD_MMAP ||
226                                      type == PERF_RECORD_MMAP2 ||
227                                      type == PERF_RECORD_FORK ||
228                                      type == PERF_RECORD_EXIT) &&
229                                      (pid_t)event->comm.pid != evlist->workload.pid) {
230                                         pr_debug("%s with unexpected pid/tid\n", name);
231                                         ++errs;
232                                 }
233 
234                                 if ((type == PERF_RECORD_COMM ||
235                                      type == PERF_RECORD_MMAP ||
236                                      type == PERF_RECORD_MMAP2) &&
237                                      event->comm.pid != event->comm.tid) {
238                                         pr_debug("%s with different pid/tid!\n", name);
239                                         ++errs;
240                                 }
241 
242                                 switch (type) {
243                                 case PERF_RECORD_COMM:
244                                         if (strcmp(event->comm.comm, cmd)) {
245                                                 pr_debug("%s with unexpected comm!\n", name);
246                                                 ++errs;
247                                         }
248                                         break;
249                                 case PERF_RECORD_EXIT:
250                                         goto found_exit;
251                                 case PERF_RECORD_MMAP:
252                                         mmap_filename = event->mmap.filename;
253                                         goto check_bname;
254                                 case PERF_RECORD_MMAP2:
255                                         mmap_filename = event->mmap2.filename;
256                                 check_bname:
257                                         bname = strrchr(mmap_filename, '/');
258                                         if (bname != NULL) {
259                                                 if (!found_cmd_mmap)
260                                                         found_cmd_mmap = !strcmp(bname + 1, cmd);
261                                                 if (!found_coreutils_mmap)
262                                                         found_coreutils_mmap = !strcmp(bname + 1, "coreutils");
263                                                 if (!found_libc_mmap)
264                                                         found_libc_mmap = !strncmp(bname + 1, "libc", 4);
265                                                 if (!found_ld_mmap)
266                                                         found_ld_mmap = !strncmp(bname + 1, "ld", 2);
267                                         } else if (!found_vdso_mmap)
268                                                 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
269                                         break;
270 
271                                 case PERF_RECORD_SAMPLE:
272                                         /* Just ignore samples for now */
273                                         break;
274                                 default:
275                                         pr_debug("Unexpected perf_event->header.type %d!\n",
276                                                  type);
277                                         ++errs;
278                                 }
279 
280                                 perf_mmap__consume(&md->core);
281                         }
282                         perf_mmap__read_done(&md->core);
283                 }
284 
285                 /*
286                  * We don't use poll here because at least at 3.1 times the
287                  * PERF_RECORD_{!SAMPLE} events don't honour
288                  * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
289                  */
290                 if (total_events == before && false)
291                         evlist__poll(evlist, -1);
292 
293                 sleep(1);
294                 if (++wakeups > 5) {
295                         pr_debug("No PERF_RECORD_EXIT event!\n");
296                         break;
297                 }
298         }
299 
300 found_exit:
301         if (nr_events[PERF_RECORD_COMM] > 1 + !!found_coreutils_mmap) {
302                 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
303                 ++errs;
304         }
305 
306         if (nr_events[PERF_RECORD_COMM] == 0) {
307                 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
308                 ++errs;
309         }
310 
311         if (!found_cmd_mmap && !found_coreutils_mmap) {
312                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
313                 ++errs;
314         }
315 
316         if (!found_libc_mmap) {
317                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
318                 ++errs;
319         }
320 
321         if (!found_ld_mmap) {
322                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
323                 ++errs;
324         }
325 
326         if (!found_vdso_mmap) {
327                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
328                 ++errs;
329         }
330 out_delete_evlist:
331         evlist__delete(evlist);
332 out:
333         return (err < 0 || errs > 0) ? -1 : 0;
334 }
335 

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