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