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