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
sched__get_first_possible_cpu(pid_t pid,cpu_set_t * maskp)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
test__PERF_RECORD(void)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, *mmap_filename;
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_MMAP2 ||
216 type == PERF_RECORD_FORK ||
217 type == PERF_RECORD_EXIT) &&
218 (pid_t)event->comm.pid != evlist->workload.pid) {
219 pr_debug("%s with unexpected pid/tid\n", name);
220 ++errs;
221 }
222
223 if ((type == PERF_RECORD_COMM ||
224 type == PERF_RECORD_MMAP ||
225 type == PERF_RECORD_MMAP2) &&
226 event->comm.pid != event->comm.tid) {
227 pr_debug("%s with different pid/tid!\n", name);
228 ++errs;
229 }
230
231 switch (type) {
232 case PERF_RECORD_COMM:
233 if (strcmp(event->comm.comm, cmd)) {
234 pr_debug("%s with unexpected comm!\n", name);
235 ++errs;
236 }
237 break;
238 case PERF_RECORD_EXIT:
239 goto found_exit;
240 case PERF_RECORD_MMAP:
241 mmap_filename = event->mmap.filename;
242 goto check_bname;
243 case PERF_RECORD_MMAP2:
244 mmap_filename = event->mmap2.filename;
245 check_bname:
246 bname = strrchr(mmap_filename, '/');
247 if (bname != NULL) {
248 if (!found_cmd_mmap)
249 found_cmd_mmap = !strcmp(bname + 1, cmd);
250 if (!found_libc_mmap)
251 found_libc_mmap = !strncmp(bname + 1, "libc", 4);
252 if (!found_ld_mmap)
253 found_ld_mmap = !strncmp(bname + 1, "ld", 2);
254 } else if (!found_vdso_mmap)
255 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]");
256 break;
257
258 case PERF_RECORD_SAMPLE:
259 /* Just ignore samples for now */
260 break;
261 default:
262 pr_debug("Unexpected perf_event->header.type %d!\n",
263 type);
264 ++errs;
265 }
266
267 perf_evlist__mmap_consume(evlist, i);
268 }
269 }
270
271 /*
272 * We don't use poll here because at least at 3.1 times the
273 * PERF_RECORD_{!SAMPLE} events don't honour
274 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
275 */
276 if (total_events == before && false)
277 poll(evlist->pollfd, evlist->nr_fds, -1);
278
279 sleep(1);
280 if (++wakeups > 5) {
281 pr_debug("No PERF_RECORD_EXIT event!\n");
282 break;
283 }
284 }
285
286 found_exit:
287 if (nr_events[PERF_RECORD_COMM] > 1) {
288 pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
289 ++errs;
290 }
291
292 if (nr_events[PERF_RECORD_COMM] == 0) {
293 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
294 ++errs;
295 }
296
297 if (!found_cmd_mmap) {
298 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
299 ++errs;
300 }
301
302 if (!found_libc_mmap) {
303 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
304 ++errs;
305 }
306
307 if (!found_ld_mmap) {
308 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
309 ++errs;
310 }
311
312 if (!found_vdso_mmap) {
313 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
314 ++errs;
315 }
316 out_err:
317 perf_evlist__munmap(evlist);
318 out_close_evlist:
319 perf_evlist__close(evlist);
320 out_delete_maps:
321 perf_evlist__delete_maps(evlist);
322 out_delete_evlist:
323 perf_evlist__delete(evlist);
324 out:
325 return (err < 0 || errs > 0) ? -1 : 0;
326 }
327