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(int subtest __maybe_unused) 36 { 37 struct record_opts opts = { 38 .target = { 39 .uid = UINT_MAX, 40 .uses_mmap = true, 41 }, 42 .no_buffering = true, 43 .mmap_pages = 256, 44 }; 45 cpu_set_t cpu_mask; 46 size_t cpu_mask_size = sizeof(cpu_mask); 47 struct perf_evlist *evlist = perf_evlist__new_dummy(); 48 struct perf_evsel *evsel; 49 struct perf_sample sample; 50 const char *cmd = "sleep"; 51 const char *argv[] = { cmd, "1", NULL, }; 52 char *bname, *mmap_filename; 53 u64 prev_time = 0; 54 bool found_cmd_mmap = false, 55 found_libc_mmap = false, 56 found_vdso_mmap = false, 57 found_ld_mmap = false; 58 int err = -1, errs = 0, i, wakeups = 0; 59 u32 cpu; 60 int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, }; 61 char sbuf[STRERR_BUFSIZE]; 62 63 if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */ 64 evlist = perf_evlist__new_default(); 65 66 if (evlist == NULL || argv == NULL) { 67 pr_debug("Not enough memory to create evlist\n"); 68 goto out; 69 } 70 71 /* 72 * Create maps of threads and cpus to monitor. In this case 73 * we start with all threads and cpus (-1, -1) but then in 74 * perf_evlist__prepare_workload we'll fill in the only thread 75 * we're monitoring, the one forked there. 76 */ 77 err = perf_evlist__create_maps(evlist, &opts.target); 78 if (err < 0) { 79 pr_debug("Not enough memory to create thread/cpu maps\n"); 80 goto out_delete_evlist; 81 } 82 83 /* 84 * Prepare the workload in argv[] to run, it'll fork it, and then wait 85 * for perf_evlist__start_workload() to exec it. This is done this way 86 * so that we have time to open the evlist (calling sys_perf_event_open 87 * on all the fds) and then mmap them. 88 */ 89 err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL); 90 if (err < 0) { 91 pr_debug("Couldn't run the workload!\n"); 92 goto out_delete_evlist; 93 } 94 95 /* 96 * Config the evsels, setting attr->comm on the first one, etc. 97 */ 98 evsel = perf_evlist__first(evlist); 99 perf_evsel__set_sample_bit(evsel, CPU); 100 perf_evsel__set_sample_bit(evsel, TID); 101 perf_evsel__set_sample_bit(evsel, TIME); 102 perf_evlist__config(evlist, &opts, NULL); 103 104 err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask); 105 if (err < 0) { 106 pr_debug("sched__get_first_possible_cpu: %s\n", 107 strerror_r(errno, sbuf, sizeof(sbuf))); 108 goto out_delete_evlist; 109 } 110 111 cpu = err; 112 113 /* 114 * So that we can check perf_sample.cpu on all the samples. 115 */ 116 if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) { 117 pr_debug("sched_setaffinity: %s\n", 118 strerror_r(errno, sbuf, sizeof(sbuf))); 119 goto out_delete_evlist; 120 } 121 122 /* 123 * Call sys_perf_event_open on all the fds on all the evsels, 124 * grouping them if asked to. 125 */ 126 err = perf_evlist__open(evlist); 127 if (err < 0) { 128 pr_debug("perf_evlist__open: %s\n", 129 strerror_r(errno, sbuf, sizeof(sbuf))); 130 goto out_delete_evlist; 131 } 132 133 /* 134 * mmap the first fd on a given CPU and ask for events for the other 135 * fds in the same CPU to be injected in the same mmap ring buffer 136 * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)). 137 */ 138 err = perf_evlist__mmap(evlist, opts.mmap_pages, false); 139 if (err < 0) { 140 pr_debug("perf_evlist__mmap: %s\n", 141 strerror_r(errno, sbuf, sizeof(sbuf))); 142 goto out_delete_evlist; 143 } 144 145 /* 146 * Now that all is properly set up, enable the events, they will 147 * count just on workload.pid, which will start... 148 */ 149 perf_evlist__enable(evlist); 150 151 /* 152 * Now! 153 */ 154 perf_evlist__start_workload(evlist); 155 156 while (1) { 157 int before = total_events; 158 159 for (i = 0; i < evlist->nr_mmaps; i++) { 160 union perf_event *event; 161 162 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { 163 const u32 type = event->header.type; 164 const char *name = perf_event__name(type); 165 166 ++total_events; 167 if (type < PERF_RECORD_MAX) 168 nr_events[type]++; 169 170 err = perf_evlist__parse_sample(evlist, event, &sample); 171 if (err < 0) { 172 if (verbose) 173 perf_event__fprintf(event, stderr); 174 pr_debug("Couldn't parse sample\n"); 175 goto out_delete_evlist; 176 } 177 178 if (verbose) { 179 pr_info("%" PRIu64" %d ", sample.time, sample.cpu); 180 perf_event__fprintf(event, stderr); 181 } 182 183 if (prev_time > sample.time) { 184 pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n", 185 name, prev_time, sample.time); 186 ++errs; 187 } 188 189 prev_time = sample.time; 190 191 if (sample.cpu != cpu) { 192 pr_debug("%s with unexpected cpu, expected %d, got %d\n", 193 name, cpu, sample.cpu); 194 ++errs; 195 } 196 197 if ((pid_t)sample.pid != evlist->workload.pid) { 198 pr_debug("%s with unexpected pid, expected %d, got %d\n", 199 name, evlist->workload.pid, sample.pid); 200 ++errs; 201 } 202 203 if ((pid_t)sample.tid != evlist->workload.pid) { 204 pr_debug("%s with unexpected tid, expected %d, got %d\n", 205 name, evlist->workload.pid, sample.tid); 206 ++errs; 207 } 208 209 if ((type == PERF_RECORD_COMM || 210 type == PERF_RECORD_MMAP || 211 type == PERF_RECORD_MMAP2 || 212 type == PERF_RECORD_FORK || 213 type == PERF_RECORD_EXIT) && 214 (pid_t)event->comm.pid != evlist->workload.pid) { 215 pr_debug("%s with unexpected pid/tid\n", name); 216 ++errs; 217 } 218 219 if ((type == PERF_RECORD_COMM || 220 type == PERF_RECORD_MMAP || 221 type == PERF_RECORD_MMAP2) && 222 event->comm.pid != event->comm.tid) { 223 pr_debug("%s with different pid/tid!\n", name); 224 ++errs; 225 } 226 227 switch (type) { 228 case PERF_RECORD_COMM: 229 if (strcmp(event->comm.comm, cmd)) { 230 pr_debug("%s with unexpected comm!\n", name); 231 ++errs; 232 } 233 break; 234 case PERF_RECORD_EXIT: 235 goto found_exit; 236 case PERF_RECORD_MMAP: 237 mmap_filename = event->mmap.filename; 238 goto check_bname; 239 case PERF_RECORD_MMAP2: 240 mmap_filename = event->mmap2.filename; 241 check_bname: 242 bname = strrchr(mmap_filename, '/'); 243 if (bname != NULL) { 244 if (!found_cmd_mmap) 245 found_cmd_mmap = !strcmp(bname + 1, cmd); 246 if (!found_libc_mmap) 247 found_libc_mmap = !strncmp(bname + 1, "libc", 4); 248 if (!found_ld_mmap) 249 found_ld_mmap = !strncmp(bname + 1, "ld", 2); 250 } else if (!found_vdso_mmap) 251 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]"); 252 break; 253 254 case PERF_RECORD_SAMPLE: 255 /* Just ignore samples for now */ 256 break; 257 default: 258 pr_debug("Unexpected perf_event->header.type %d!\n", 259 type); 260 ++errs; 261 } 262 263 perf_evlist__mmap_consume(evlist, i); 264 } 265 } 266 267 /* 268 * We don't use poll here because at least at 3.1 times the 269 * PERF_RECORD_{!SAMPLE} events don't honour 270 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does. 271 */ 272 if (total_events == before && false) 273 perf_evlist__poll(evlist, -1); 274 275 sleep(1); 276 if (++wakeups > 5) { 277 pr_debug("No PERF_RECORD_EXIT event!\n"); 278 break; 279 } 280 } 281 282 found_exit: 283 if (nr_events[PERF_RECORD_COMM] > 1) { 284 pr_debug("Excessive number of PERF_RECORD_COMM events!\n"); 285 ++errs; 286 } 287 288 if (nr_events[PERF_RECORD_COMM] == 0) { 289 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd); 290 ++errs; 291 } 292 293 if (!found_cmd_mmap) { 294 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd); 295 ++errs; 296 } 297 298 if (!found_libc_mmap) { 299 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc"); 300 ++errs; 301 } 302 303 if (!found_ld_mmap) { 304 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld"); 305 ++errs; 306 } 307 308 if (!found_vdso_mmap) { 309 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]"); 310 ++errs; 311 } 312 out_delete_evlist: 313 perf_evlist__delete(evlist); 314 out: 315 return (err < 0 || errs > 0) ? -1 : 0; 316 } 317