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TOMOYO Linux Cross Reference
Linux/tools/perf/tests/perf-record.c

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

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