perf tests: Fixup return path of perf record test case
[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.target, argv,
97                                             false, false);
98         if (err < 0) {
99                 pr_debug("Couldn't run the workload!\n");
100                 goto out_delete_maps;
101         }
102
103         /*
104          * Config the evsels, setting attr->comm on the first one, etc.
105          */
106         evsel = perf_evlist__first(evlist);
107         perf_evsel__set_sample_bit(evsel, CPU);
108         perf_evsel__set_sample_bit(evsel, TID);
109         perf_evsel__set_sample_bit(evsel, TIME);
110         perf_evlist__config(evlist, &opts);
111
112         err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask);
113         if (err < 0) {
114                 pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno));
115                 goto out_delete_maps;
116         }
117
118         cpu = err;
119
120         /*
121          * So that we can check perf_sample.cpu on all the samples.
122          */
123         if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
124                 pr_debug("sched_setaffinity: %s\n", strerror(errno));
125                 goto out_delete_maps;
126         }
127
128         /*
129          * Call sys_perf_event_open on all the fds on all the evsels,
130          * grouping them if asked to.
131          */
132         err = perf_evlist__open(evlist);
133         if (err < 0) {
134                 pr_debug("perf_evlist__open: %s\n", strerror(errno));
135                 goto out_delete_maps;
136         }
137
138         /*
139          * mmap the first fd on a given CPU and ask for events for the other
140          * fds in the same CPU to be injected in the same mmap ring buffer
141          * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
142          */
143         err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
144         if (err < 0) {
145                 pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
146                 goto out_close_evlist;
147         }
148
149         /*
150          * Now that all is properly set up, enable the events, they will
151          * count just on workload.pid, which will start...
152          */
153         perf_evlist__enable(evlist);
154
155         /*
156          * Now!
157          */
158         perf_evlist__start_workload(evlist);
159
160         while (1) {
161                 int before = total_events;
162
163                 for (i = 0; i < evlist->nr_mmaps; i++) {
164                         union perf_event *event;
165
166                         while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
167                                 const u32 type = event->header.type;
168                                 const char *name = perf_event__name(type);
169
170                                 ++total_events;
171                                 if (type < PERF_RECORD_MAX)
172                                         nr_events[type]++;
173
174                                 err = perf_evlist__parse_sample(evlist, event, &sample);
175                                 if (err < 0) {
176                                         if (verbose)
177                                                 perf_event__fprintf(event, stderr);
178                                         pr_debug("Couldn't parse sample\n");
179                                         goto out_err;
180                                 }
181
182                                 if (verbose) {
183                                         pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
184                                         perf_event__fprintf(event, stderr);
185                                 }
186
187                                 if (prev_time > sample.time) {
188                                         pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
189                                                  name, prev_time, sample.time);
190                                         ++errs;
191                                 }
192
193                                 prev_time = sample.time;
194
195                                 if (sample.cpu != cpu) {
196                                         pr_debug("%s with unexpected cpu, expected %d, got %d\n",
197                                                  name, cpu, sample.cpu);
198                                         ++errs;
199                                 }
200
201                                 if ((pid_t)sample.pid != evlist->workload.pid) {
202                                         pr_debug("%s with unexpected pid, expected %d, got %d\n",
203                                                  name, evlist->workload.pid, sample.pid);
204                                         ++errs;
205                                 }
206
207                                 if ((pid_t)sample.tid != evlist->workload.pid) {
208                                         pr_debug("%s with unexpected tid, expected %d, got %d\n",
209                                                  name, evlist->workload.pid, sample.tid);
210                                         ++errs;
211                                 }
212
213                                 if ((type == PERF_RECORD_COMM ||
214                                      type == PERF_RECORD_MMAP ||
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                                      event->comm.pid != event->comm.tid) {
225                                         pr_debug("%s with different pid/tid!\n", name);
226                                         ++errs;
227                                 }
228
229                                 switch (type) {
230                                 case PERF_RECORD_COMM:
231                                         if (strcmp(event->comm.comm, cmd)) {
232                                                 pr_debug("%s with unexpected comm!\n", name);
233                                                 ++errs;
234                                         }
235                                         break;
236                                 case PERF_RECORD_EXIT:
237                                         goto found_exit;
238                                 case PERF_RECORD_MMAP:
239                                         bname = strrchr(event->mmap.filename, '/');
240                                         if (bname != NULL) {
241                                                 if (!found_cmd_mmap)
242                                                         found_cmd_mmap = !strcmp(bname + 1, cmd);
243                                                 if (!found_libc_mmap)
244                                                         found_libc_mmap = !strncmp(bname + 1, "libc", 4);
245                                                 if (!found_ld_mmap)
246                                                         found_ld_mmap = !strncmp(bname + 1, "ld", 2);
247                                         } else if (!found_vdso_mmap)
248                                                 found_vdso_mmap = !strcmp(event->mmap.filename, "[vdso]");
249                                         break;
250
251                                 case PERF_RECORD_SAMPLE:
252                                         /* Just ignore samples for now */
253                                         break;
254                                 default:
255                                         pr_debug("Unexpected perf_event->header.type %d!\n",
256                                                  type);
257                                         ++errs;
258                                 }
259                         }
260                 }
261
262                 /*
263                  * We don't use poll here because at least at 3.1 times the
264                  * PERF_RECORD_{!SAMPLE} events don't honour
265                  * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
266                  */
267                 if (total_events == before && false)
268                         poll(evlist->pollfd, evlist->nr_fds, -1);
269
270                 sleep(1);
271                 if (++wakeups > 5) {
272                         pr_debug("No PERF_RECORD_EXIT event!\n");
273                         break;
274                 }
275         }
276
277 found_exit:
278         if (nr_events[PERF_RECORD_COMM] > 1) {
279                 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
280                 ++errs;
281         }
282
283         if (nr_events[PERF_RECORD_COMM] == 0) {
284                 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
285                 ++errs;
286         }
287
288         if (!found_cmd_mmap) {
289                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
290                 ++errs;
291         }
292
293         if (!found_libc_mmap) {
294                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
295                 ++errs;
296         }
297
298         if (!found_ld_mmap) {
299                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
300                 ++errs;
301         }
302
303         if (!found_vdso_mmap) {
304                 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
305                 ++errs;
306         }
307 out_err:
308         perf_evlist__munmap(evlist);
309 out_close_evlist:
310         perf_evlist__close(evlist);
311 out_delete_maps:
312         perf_evlist__delete_maps(evlist);
313 out_delete_evlist:
314         perf_evlist__delete(evlist);
315 out:
316         return (err < 0 || errs > 0) ? -1 : 0;
317 }