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, *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
