1 #include <errno.h> 2 #include <inttypes.h> 3 /* For the CLR_() macros */ 4 #include <pthread.h> 5 6 #include <sched.h> 7 #include "evlist.h" 8 #include "evsel.h" 9 #include "perf.h" 10 #include "debug.h" 11 #include "tests.h" 12 13 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp) 14 { 15 int i, cpu = -1, nrcpus = 1024; 16 realloc: 17 CPU_ZERO(maskp); 18 19 if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) { 20 if (errno == EINVAL && nrcpus < (1024 << 8)) { 21 nrcpus = nrcpus << 2; 22 goto realloc; 23 } 24 perror("sched_getaffinity"); 25 return -1; 26 } 27 28 for (i = 0; i < nrcpus; i++) { 29 if (CPU_ISSET(i, maskp)) { 30 if (cpu == -1) 31 cpu = i; 32 else 33 CPU_CLR(i, maskp); 34 } 35 } 36 37 return cpu; 38 } 39 40 int test__PERF_RECORD(int subtest __maybe_unused) 41 { 42 struct record_opts opts = { 43 .target = { 44 .uid = UINT_MAX, 45 .uses_mmap = true, 46 }, 47 .no_buffering = true, 48 .mmap_pages = 256, 49 }; 50 cpu_set_t cpu_mask; 51 size_t cpu_mask_size = sizeof(cpu_mask); 52 struct perf_evlist *evlist = perf_evlist__new_dummy(); 53 struct perf_evsel *evsel; 54 struct perf_sample sample; 55 const char *cmd = "sleep"; 56 const char *argv[] = { cmd, "1", NULL, }; 57 char *bname, *mmap_filename; 58 u64 prev_time = 0; 59 bool found_cmd_mmap = false, 60 found_libc_mmap = false, 61 found_vdso_mmap = false, 62 found_ld_mmap = false; 63 int err = -1, errs = 0, i, wakeups = 0; 64 u32 cpu; 65 int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, }; 66 char sbuf[STRERR_BUFSIZE]; 67 68 if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */ 69 evlist = perf_evlist__new_default(); 70 71 if (evlist == NULL) { 72 pr_debug("Not enough memory to create evlist\n"); 73 goto out; 74 } 75 76 /* 77 * Create maps of threads and cpus to monitor. In this case 78 * we start with all threads and cpus (-1, -1) but then in 79 * perf_evlist__prepare_workload we'll fill in the only thread 80 * we're monitoring, the one forked there. 81 */ 82 err = perf_evlist__create_maps(evlist, &opts.target); 83 if (err < 0) { 84 pr_debug("Not enough memory to create thread/cpu maps\n"); 85 goto out_delete_evlist; 86 } 87 88 /* 89 * Prepare the workload in argv[] to run, it'll fork it, and then wait 90 * for perf_evlist__start_workload() to exec it. This is done this way 91 * so that we have time to open the evlist (calling sys_perf_event_open 92 * on all the fds) and then mmap them. 93 */ 94 err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL); 95 if (err < 0) { 96 pr_debug("Couldn't run the workload!\n"); 97 goto out_delete_evlist; 98 } 99 100 /* 101 * Config the evsels, setting attr->comm on the first one, etc. 102 */ 103 evsel = perf_evlist__first(evlist); 104 perf_evsel__set_sample_bit(evsel, CPU); 105 perf_evsel__set_sample_bit(evsel, TID); 106 perf_evsel__set_sample_bit(evsel, TIME); 107 perf_evlist__config(evlist, &opts, NULL); 108 109 err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask); 110 if (err < 0) { 111 pr_debug("sched__get_first_possible_cpu: %s\n", 112 str_error_r(errno, sbuf, sizeof(sbuf))); 113 goto out_delete_evlist; 114 } 115 116 cpu = err; 117 118 /* 119 * So that we can check perf_sample.cpu on all the samples. 120 */ 121 if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) { 122 pr_debug("sched_setaffinity: %s\n", 123 str_error_r(errno, sbuf, sizeof(sbuf))); 124 goto out_delete_evlist; 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", 134 str_error_r(errno, sbuf, sizeof(sbuf))); 135 goto out_delete_evlist; 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", 146 str_error_r(errno, sbuf, sizeof(sbuf))); 147 goto out_delete_evlist; 148 } 149 150 /* 151 * Now that all is properly set up, enable the events, they will 152 * count just on workload.pid, which will start... 153 */ 154 perf_evlist__enable(evlist); 155 156 /* 157 * Now! 158 */ 159 perf_evlist__start_workload(evlist); 160 161 while (1) { 162 int before = total_events; 163 164 for (i = 0; i < evlist->nr_mmaps; i++) { 165 union perf_event *event; 166 167 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { 168 const u32 type = event->header.type; 169 const char *name = perf_event__name(type); 170 171 ++total_events; 172 if (type < PERF_RECORD_MAX) 173 nr_events[type]++; 174 175 err = perf_evlist__parse_sample(evlist, event, &sample); 176 if (err < 0) { 177 if (verbose > 0) 178 perf_event__fprintf(event, stderr); 179 pr_debug("Couldn't parse sample\n"); 180 goto out_delete_evlist; 181 } 182 183 if (verbose > 0) { 184 pr_info("%" PRIu64" %d ", sample.time, sample.cpu); 185 perf_event__fprintf(event, stderr); 186 } 187 188 if (prev_time > sample.time) { 189 pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n", 190 name, prev_time, sample.time); 191 ++errs; 192 } 193 194 prev_time = sample.time; 195 196 if (sample.cpu != cpu) { 197 pr_debug("%s with unexpected cpu, expected %d, got %d\n", 198 name, cpu, sample.cpu); 199 ++errs; 200 } 201 202 if ((pid_t)sample.pid != evlist->workload.pid) { 203 pr_debug("%s with unexpected pid, expected %d, got %d\n", 204 name, evlist->workload.pid, sample.pid); 205 ++errs; 206 } 207 208 if ((pid_t)sample.tid != evlist->workload.pid) { 209 pr_debug("%s with unexpected tid, expected %d, got %d\n", 210 name, evlist->workload.pid, sample.tid); 211 ++errs; 212 } 213 214 if ((type == PERF_RECORD_COMM || 215 type == PERF_RECORD_MMAP || 216 type == PERF_RECORD_MMAP2 || 217 type == PERF_RECORD_FORK || 218 type == PERF_RECORD_EXIT) && 219 (pid_t)event->comm.pid != evlist->workload.pid) { 220 pr_debug("%s with unexpected pid/tid\n", name); 221 ++errs; 222 } 223 224 if ((type == PERF_RECORD_COMM || 225 type == PERF_RECORD_MMAP || 226 type == PERF_RECORD_MMAP2) && 227 event->comm.pid != event->comm.tid) { 228 pr_debug("%s with different pid/tid!\n", name); 229 ++errs; 230 } 231 232 switch (type) { 233 case PERF_RECORD_COMM: 234 if (strcmp(event->comm.comm, cmd)) { 235 pr_debug("%s with unexpected comm!\n", name); 236 ++errs; 237 } 238 break; 239 case PERF_RECORD_EXIT: 240 goto found_exit; 241 case PERF_RECORD_MMAP: 242 mmap_filename = event->mmap.filename; 243 goto check_bname; 244 case PERF_RECORD_MMAP2: 245 mmap_filename = event->mmap2.filename; 246 check_bname: 247 bname = strrchr(mmap_filename, '/'); 248 if (bname != NULL) { 249 if (!found_cmd_mmap) 250 found_cmd_mmap = !strcmp(bname + 1, cmd); 251 if (!found_libc_mmap) 252 found_libc_mmap = !strncmp(bname + 1, "libc", 4); 253 if (!found_ld_mmap) 254 found_ld_mmap = !strncmp(bname + 1, "ld", 2); 255 } else if (!found_vdso_mmap) 256 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]"); 257 break; 258 259 case PERF_RECORD_SAMPLE: 260 /* Just ignore samples for now */ 261 break; 262 default: 263 pr_debug("Unexpected perf_event->header.type %d!\n", 264 type); 265 ++errs; 266 } 267 268 perf_evlist__mmap_consume(evlist, i); 269 } 270 } 271 272 /* 273 * We don't use poll here because at least at 3.1 times the 274 * PERF_RECORD_{!SAMPLE} events don't honour 275 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does. 276 */ 277 if (total_events == before && false) 278 perf_evlist__poll(evlist, -1); 279 280 sleep(1); 281 if (++wakeups > 5) { 282 pr_debug("No PERF_RECORD_EXIT event!\n"); 283 break; 284 } 285 } 286 287 found_exit: 288 if (nr_events[PERF_RECORD_COMM] > 1) { 289 pr_debug("Excessive number of PERF_RECORD_COMM events!\n"); 290 ++errs; 291 } 292 293 if (nr_events[PERF_RECORD_COMM] == 0) { 294 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd); 295 ++errs; 296 } 297 298 if (!found_cmd_mmap) { 299 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd); 300 ++errs; 301 } 302 303 if (!found_libc_mmap) { 304 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc"); 305 ++errs; 306 } 307 308 if (!found_ld_mmap) { 309 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld"); 310 ++errs; 311 } 312 313 if (!found_vdso_mmap) { 314 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]"); 315 ++errs; 316 } 317 out_delete_evlist: 318 perf_evlist__delete(evlist); 319 out: 320 return (err < 0 || errs > 0) ? -1 : 0; 321 } 322