f6ba75a983a8e1c767b1c3caf72a0343123ee389
[linux-3.10.git] / tools / perf / tests / perf-record.c
1 #include <sched.h>
2 #include "evlist.h"
3 #include "evsel.h"
4 #include "perf.h"
5 #include "debug.h"
6 #include "tests.h"
7
8 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp)
9 {
10         int i, cpu = -1, nrcpus = 1024;
11 realloc:
12         CPU_ZERO(maskp);
13
14         if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) {
15                 if (errno == EINVAL && nrcpus < (1024 << 8)) {
16                         nrcpus = nrcpus << 2;
17                         goto realloc;
18                 }
19                 perror("sched_getaffinity");
20                         return -1;
21         }
22
23         for (i = 0; i < nrcpus; i++) {
24                 if (CPU_ISSET(i, maskp)) {
25                         if (cpu == -1)
26                                 cpu = i;
27                         else
28                                 CPU_CLR(i, maskp);
29                 }
30         }
31
32         return cpu;
33 }
34
35 int test__PERF_RECORD(void)
36 {
37         struct perf_record_opts opts = {
38                 .target = {
39                         .uid = UINT_MAX,
40                         .uses_mmap = true,
41                 },
42                 .no_delay   = true,
43                 .freq       = 10,
44                 .mmap_pages = 256,
45         };
46         cpu_set_t cpu_mask;
47         size_t cpu_mask_size = sizeof(cpu_mask);
48         struct perf_evlist *evlist = perf_evlist__new();
49         struct perf_evsel *evsel;
50         struct perf_sample sample;
51         const char *cmd = "sleep";
52         const char *argv[] = { cmd, "1", NULL, };
53         char *bname;
54         u64 prev_time = 0;
55         bool found_cmd_mmap = false,
56              found_libc_mmap = false,
57              found_vdso_mmap = false,
58              found_ld_mmap = false;
59         int err = -1, errs = 0, i, wakeups = 0;
60         u32 cpu;
61         int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
62
63         if (evlist == NULL || argv == NULL) {
64                 pr_debug("Not enough memory to create evlist\n");
65                 goto out;
66         }
67
68         /*
69          * We need at least one evsel in the evlist, use the default
70          * one: "cycles".
71          */
72         err = perf_evlist__add_default(evlist);
73         if (err < 0) {
74                 pr_debug("Not enough memory to create evsel\n");
75                 goto out_delete_evlist;
76         }
77
78         /*
79          * Create maps of threads and cpus to monitor. In this case
80          * we start with all threads and cpus (-1, -1) but then in
81          * perf_evlist__prepare_workload we'll fill in the only thread
82          * we're monitoring, the one forked there.
83          */
84         err = perf_evlist__create_maps(evlist, &opts.target);
85         if (err < 0) {
86                 pr_debug("Not enough memory to create thread/cpu maps\n");
87                 goto out_delete_evlist;
88         }
89
90         /*
91          * Prepare the workload in argv[] to run, it'll fork it, and then wait
92          * for perf_evlist__start_workload() to exec it. This is done this way
93          * so that we have time to open the evlist (calling sys_perf_event_open
94          * on all the fds) and then mmap them.
95          */
96         err = perf_evlist__prepare_workload(evlist, &opts, argv);
97         if (err < 0) {
98                 pr_debug("Couldn't run the workload!\n");
99                 goto out_delete_maps;
100         }
101
102         /*
103          * Config the evsels, setting attr->comm on the first one, etc.
104          */
105         evsel = perf_evlist__first(evlist);
106         perf_evsel__set_sample_bit(evsel, CPU);
107         perf_evsel__set_sample_bit(evsel, TID);
108         perf_evsel__set_sample_bit(evsel, TIME);
109         perf_evlist__config(evlist, &opts);
110
111         err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
112         if (err < 0) {
113                 pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno));
114                 goto out_delete_maps;
115         }
116
117         cpu = err;
118
119         /*
120          * So that we can check perf_sample.cpu on all the samples.
121          */
122         if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
123                 pr_debug("sched_setaffinity: %s\n", strerror(errno));
124                 goto out_delete_maps;
125         }
126
127         /*
128          * Call sys_perf_event_open on all the fds on all the evsels,
129          * grouping them if asked to.
130          */
131         err = perf_evlist__open(evlist);
132         if (err < 0) {
133                 pr_debug("perf_evlist__open: %s\n", strerror(errno));
134                 goto out_delete_maps;
135         }
136
137         /*
138          * mmap the first fd on a given CPU and ask for events for the other
139          * fds in the same CPU to be injected in the same mmap ring buffer
140          * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
141          */
142         err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
143         if (err < 0) {
144                 pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
145                 goto out_delete_maps;
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_err;
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_FORK ||
215                                      type == PERF_RECORD_EXIT) &&
216                                      (pid_t)event->comm.pid != evlist->workload.pid) {
217                                         pr_debug("%s with unexpected pid/tid\n", name);
218                                         ++errs;
219                                 }
220
221                                 if ((type == PERF_RECORD_COMM ||
222                                      type == PERF_RECORD_MMAP) &&
223                                      event->comm.pid != event->comm.tid) {
224                                         pr_debug("%s with different pid/tid!\n", name);
225                                         ++errs;
226                                 }
227
228                                 switch (type) {
229                                 case PERF_RECORD_COMM:
230                                         if (strcmp(event->comm.comm, cmd)) {
231                                                 pr_debug("%s with unexpected comm!\n", name);
232                                                 ++errs;
233                                         }
234                                         break;
235                                 case PERF_RECORD_EXIT:
236                                         goto found_exit;
237                                 case PERF_RECORD_MMAP:
238                                         bname = strrchr(event->mmap.filename, '/');
239                                         if (bname != NULL) {
240                                                 if (!found_cmd_mmap)
241                                                         found_cmd_mmap = !strcmp(bname + 1, cmd);
242                                                 if (!found_libc_mmap)
243                                                         found_libc_mmap = !strncmp(bname + 1, "libc", 4);
244                                                 if (!found_ld_mmap)
245                                                         found_ld_mmap = !strncmp(bname + 1, "ld", 2);
246                                         } else if (!found_vdso_mmap)
247                                                 found_vdso_mmap = !strcmp(event->mmap.filename, "[vdso]");
248                                         break;
249
250                                 case PERF_RECORD_SAMPLE:
251                                         /* Just ignore samples for now */
252                                         break;
253                                 default:
254                                         pr_debug("Unexpected perf_event->header.type %d!\n",
255                                                  type);
256                                         ++errs;
257                                 }
258                         }
259                 }
260
261                 /*
262                  * We don't use poll here because at least at 3.1 times the
263                  * PERF_RECORD_{!SAMPLE} events don't honour
264                  * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
265                  */
266                 if (total_events == before && false)
267                         poll(evlist->pollfd, evlist->nr_fds, -1);
268
269                 sleep(1);
270                 if (++wakeups > 5) {
271                         pr_debug("No PERF_RECORD_EXIT event!\n");
272                         break;
273                 }
274         }
275
276 found_exit:
277         if (nr_events[PERF_RECORD_COMM] > 1) {
278                 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
279                 ++errs;
280         }
281
282         if (nr_events[PERF_RECORD_COMM] == 0) {
283                 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
284                 ++errs;
285         }
286
287         if (!found_cmd_mmap) {
288                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
289                 ++errs;
290         }
291
292         if (!found_libc_mmap) {
293                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
294                 ++errs;
295         }
296
297         if (!found_ld_mmap) {
298                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
299                 ++errs;
300         }
301
302         if (!found_vdso_mmap) {
303                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
304                 ++errs;
305         }
306 out_err:
307         perf_evlist__munmap(evlist);
308 out_delete_maps:
309         perf_evlist__delete_maps(evlist);
310 out_delete_evlist:
311         perf_evlist__delete(evlist);
312 out:
313         return (err < 0 || errs > 0) ? -1 : 0;
314 }