Commit | Line | Data |
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16d00fee JO |
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 | { | |
b4006796 | 37 | struct record_opts opts = { |
16d00fee JO |
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); | |
b22d54b0 | 48 | struct perf_evlist *evlist = perf_evlist__new_default(); |
16d00fee JO |
49 | struct perf_evsel *evsel; |
50 | struct perf_sample sample; | |
51 | const char *cmd = "sleep"; | |
52 | const char *argv[] = { cmd, "1", NULL, }; | |
5c5e854b | 53 | char *bname, *mmap_filename; |
16d00fee JO |
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 | ||
16d00fee JO |
68 | /* |
69 | * Create maps of threads and cpus to monitor. In this case | |
70 | * we start with all threads and cpus (-1, -1) but then in | |
71 | * perf_evlist__prepare_workload we'll fill in the only thread | |
72 | * we're monitoring, the one forked there. | |
73 | */ | |
74 | err = perf_evlist__create_maps(evlist, &opts.target); | |
75 | if (err < 0) { | |
76 | pr_debug("Not enough memory to create thread/cpu maps\n"); | |
77 | goto out_delete_evlist; | |
78 | } | |
79 | ||
80 | /* | |
81 | * Prepare the workload in argv[] to run, it'll fork it, and then wait | |
82 | * for perf_evlist__start_workload() to exec it. This is done this way | |
83 | * so that we have time to open the evlist (calling sys_perf_event_open | |
84 | * on all the fds) and then mmap them. | |
85 | */ | |
735f7e0b | 86 | err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL); |
16d00fee JO |
87 | if (err < 0) { |
88 | pr_debug("Couldn't run the workload!\n"); | |
ec13abc3 | 89 | goto out_delete_maps; |
16d00fee JO |
90 | } |
91 | ||
92 | /* | |
93 | * Config the evsels, setting attr->comm on the first one, etc. | |
94 | */ | |
95 | evsel = perf_evlist__first(evlist); | |
7be5ebe8 ACM |
96 | perf_evsel__set_sample_bit(evsel, CPU); |
97 | perf_evsel__set_sample_bit(evsel, TID); | |
98 | perf_evsel__set_sample_bit(evsel, TIME); | |
f77a9518 | 99 | perf_evlist__config(evlist, &opts); |
16d00fee JO |
100 | |
101 | err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask); | |
102 | if (err < 0) { | |
103 | pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno)); | |
ec13abc3 | 104 | goto out_delete_maps; |
16d00fee JO |
105 | } |
106 | ||
107 | cpu = err; | |
108 | ||
109 | /* | |
110 | * So that we can check perf_sample.cpu on all the samples. | |
111 | */ | |
112 | if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) { | |
113 | pr_debug("sched_setaffinity: %s\n", strerror(errno)); | |
ec13abc3 | 114 | goto out_delete_maps; |
16d00fee JO |
115 | } |
116 | ||
117 | /* | |
118 | * Call sys_perf_event_open on all the fds on all the evsels, | |
119 | * grouping them if asked to. | |
120 | */ | |
121 | err = perf_evlist__open(evlist); | |
122 | if (err < 0) { | |
123 | pr_debug("perf_evlist__open: %s\n", strerror(errno)); | |
ec13abc3 | 124 | goto out_delete_maps; |
16d00fee JO |
125 | } |
126 | ||
127 | /* | |
128 | * mmap the first fd on a given CPU and ask for events for the other | |
129 | * fds in the same CPU to be injected in the same mmap ring buffer | |
130 | * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)). | |
131 | */ | |
132 | err = perf_evlist__mmap(evlist, opts.mmap_pages, false); | |
133 | if (err < 0) { | |
134 | pr_debug("perf_evlist__mmap: %s\n", strerror(errno)); | |
da522c17 | 135 | goto out_close_evlist; |
16d00fee JO |
136 | } |
137 | ||
138 | /* | |
139 | * Now that all is properly set up, enable the events, they will | |
140 | * count just on workload.pid, which will start... | |
141 | */ | |
142 | perf_evlist__enable(evlist); | |
143 | ||
144 | /* | |
145 | * Now! | |
146 | */ | |
147 | perf_evlist__start_workload(evlist); | |
148 | ||
149 | while (1) { | |
150 | int before = total_events; | |
151 | ||
152 | for (i = 0; i < evlist->nr_mmaps; i++) { | |
153 | union perf_event *event; | |
154 | ||
155 | while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { | |
156 | const u32 type = event->header.type; | |
157 | const char *name = perf_event__name(type); | |
158 | ||
159 | ++total_events; | |
160 | if (type < PERF_RECORD_MAX) | |
161 | nr_events[type]++; | |
162 | ||
163 | err = perf_evlist__parse_sample(evlist, event, &sample); | |
164 | if (err < 0) { | |
165 | if (verbose) | |
166 | perf_event__fprintf(event, stderr); | |
167 | pr_debug("Couldn't parse sample\n"); | |
168 | goto out_err; | |
169 | } | |
170 | ||
171 | if (verbose) { | |
172 | pr_info("%" PRIu64" %d ", sample.time, sample.cpu); | |
173 | perf_event__fprintf(event, stderr); | |
174 | } | |
175 | ||
176 | if (prev_time > sample.time) { | |
177 | pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n", | |
178 | name, prev_time, sample.time); | |
179 | ++errs; | |
180 | } | |
181 | ||
182 | prev_time = sample.time; | |
183 | ||
184 | if (sample.cpu != cpu) { | |
185 | pr_debug("%s with unexpected cpu, expected %d, got %d\n", | |
186 | name, cpu, sample.cpu); | |
187 | ++errs; | |
188 | } | |
189 | ||
190 | if ((pid_t)sample.pid != evlist->workload.pid) { | |
191 | pr_debug("%s with unexpected pid, expected %d, got %d\n", | |
192 | name, evlist->workload.pid, sample.pid); | |
193 | ++errs; | |
194 | } | |
195 | ||
196 | if ((pid_t)sample.tid != evlist->workload.pid) { | |
197 | pr_debug("%s with unexpected tid, expected %d, got %d\n", | |
198 | name, evlist->workload.pid, sample.tid); | |
199 | ++errs; | |
200 | } | |
201 | ||
202 | if ((type == PERF_RECORD_COMM || | |
203 | type == PERF_RECORD_MMAP || | |
5c5e854b | 204 | type == PERF_RECORD_MMAP2 || |
16d00fee JO |
205 | type == PERF_RECORD_FORK || |
206 | type == PERF_RECORD_EXIT) && | |
207 | (pid_t)event->comm.pid != evlist->workload.pid) { | |
208 | pr_debug("%s with unexpected pid/tid\n", name); | |
209 | ++errs; | |
210 | } | |
211 | ||
212 | if ((type == PERF_RECORD_COMM || | |
5c5e854b SE |
213 | type == PERF_RECORD_MMAP || |
214 | type == PERF_RECORD_MMAP2) && | |
16d00fee JO |
215 | event->comm.pid != event->comm.tid) { |
216 | pr_debug("%s with different pid/tid!\n", name); | |
217 | ++errs; | |
218 | } | |
219 | ||
220 | switch (type) { | |
221 | case PERF_RECORD_COMM: | |
222 | if (strcmp(event->comm.comm, cmd)) { | |
223 | pr_debug("%s with unexpected comm!\n", name); | |
224 | ++errs; | |
225 | } | |
226 | break; | |
227 | case PERF_RECORD_EXIT: | |
228 | goto found_exit; | |
229 | case PERF_RECORD_MMAP: | |
5c5e854b SE |
230 | mmap_filename = event->mmap.filename; |
231 | goto check_bname; | |
232 | case PERF_RECORD_MMAP2: | |
233 | mmap_filename = event->mmap2.filename; | |
234 | check_bname: | |
235 | bname = strrchr(mmap_filename, '/'); | |
16d00fee JO |
236 | if (bname != NULL) { |
237 | if (!found_cmd_mmap) | |
238 | found_cmd_mmap = !strcmp(bname + 1, cmd); | |
239 | if (!found_libc_mmap) | |
240 | found_libc_mmap = !strncmp(bname + 1, "libc", 4); | |
241 | if (!found_ld_mmap) | |
242 | found_ld_mmap = !strncmp(bname + 1, "ld", 2); | |
243 | } else if (!found_vdso_mmap) | |
5c5e854b | 244 | found_vdso_mmap = !strcmp(mmap_filename, "[vdso]"); |
16d00fee JO |
245 | break; |
246 | ||
247 | case PERF_RECORD_SAMPLE: | |
248 | /* Just ignore samples for now */ | |
249 | break; | |
250 | default: | |
251 | pr_debug("Unexpected perf_event->header.type %d!\n", | |
252 | type); | |
253 | ++errs; | |
254 | } | |
8e50d384 ZZ |
255 | |
256 | perf_evlist__mmap_consume(evlist, i); | |
16d00fee JO |
257 | } |
258 | } | |
259 | ||
260 | /* | |
261 | * We don't use poll here because at least at 3.1 times the | |
262 | * PERF_RECORD_{!SAMPLE} events don't honour | |
263 | * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does. | |
264 | */ | |
265 | if (total_events == before && false) | |
266 | poll(evlist->pollfd, evlist->nr_fds, -1); | |
267 | ||
268 | sleep(1); | |
269 | if (++wakeups > 5) { | |
270 | pr_debug("No PERF_RECORD_EXIT event!\n"); | |
271 | break; | |
272 | } | |
273 | } | |
274 | ||
275 | found_exit: | |
276 | if (nr_events[PERF_RECORD_COMM] > 1) { | |
277 | pr_debug("Excessive number of PERF_RECORD_COMM events!\n"); | |
278 | ++errs; | |
279 | } | |
280 | ||
281 | if (nr_events[PERF_RECORD_COMM] == 0) { | |
282 | pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd); | |
283 | ++errs; | |
284 | } | |
285 | ||
286 | if (!found_cmd_mmap) { | |
287 | pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd); | |
288 | ++errs; | |
289 | } | |
290 | ||
291 | if (!found_libc_mmap) { | |
292 | pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc"); | |
293 | ++errs; | |
294 | } | |
295 | ||
296 | if (!found_ld_mmap) { | |
297 | pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld"); | |
298 | ++errs; | |
299 | } | |
300 | ||
301 | if (!found_vdso_mmap) { | |
302 | pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]"); | |
303 | ++errs; | |
304 | } | |
305 | out_err: | |
306 | perf_evlist__munmap(evlist); | |
da522c17 NK |
307 | out_close_evlist: |
308 | perf_evlist__close(evlist); | |
ec13abc3 ACM |
309 | out_delete_maps: |
310 | perf_evlist__delete_maps(evlist); | |
16d00fee JO |
311 | out_delete_evlist: |
312 | perf_evlist__delete(evlist); | |
313 | out: | |
314 | return (err < 0 || errs > 0) ? -1 : 0; | |
315 | } |