1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 /* For the CLR_() macros */ 5 #include <pthread.h> 6 7 #include <sched.h> 8 #include "evlist.h" 9 #include "evsel.h" 10 #include "perf.h" 11 #include "debug.h" 12 #include "tests.h" 13 14 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp) 15 { 16 int i, cpu = -1, nrcpus = 1024; 17 realloc: 18 CPU_ZERO(maskp); 19 20 if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) { 21 if (errno == EINVAL && nrcpus < (1024 << 8)) { 22 nrcpus = nrcpus << 2; 23 goto realloc; 24 } 25 perror("sched_getaffinity"); 26 return -1; 27 } 28 29 for (i = 0; i < nrcpus; i++) { 30 if (CPU_ISSET(i, maskp)) { 31 if (cpu == -1) 32 cpu = i; 33 else 34 CPU_CLR(i, maskp); 35 } 36 } 37 38 return cpu; 39 } 40 41 int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unused) 42 { 43 struct record_opts opts = { 44 .target = { 45 .uid = UINT_MAX, 46 .uses_mmap = true, 47 }, 48 .no_buffering = true, 49 .mmap_pages = 256, 50 }; 51 cpu_set_t cpu_mask; 52 size_t cpu_mask_size = sizeof(cpu_mask); 53 struct perf_evlist *evlist = perf_evlist__new_dummy(); 54 struct perf_evsel *evsel; 55 struct perf_sample sample; 56 const char *cmd = "sleep"; 57 const char *argv[] = { cmd, "1", NULL, }; 58 char *bname, *mmap_filename; 59 u64 prev_time = 0; 60 bool found_cmd_mmap = false, 61 found_libc_mmap = false, 62 found_vdso_mmap = false, 63 found_ld_mmap = false; 64 int err = -1, errs = 0, i, wakeups = 0; 65 u32 cpu; 66 int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, }; 67 char sbuf[STRERR_BUFSIZE]; 68 69 if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */ 70 evlist = perf_evlist__new_default(); 71 72 if (evlist == NULL) { 73 pr_debug("Not enough memory to create evlist\n"); 74 goto out; 75 } 76 77 /* 78 * Create maps of threads and cpus to monitor. In this case 79 * we start with all threads and cpus (-1, -1) but then in 80 * perf_evlist__prepare_workload we'll fill in the only thread 81 * we're monitoring, the one forked there. 82 */ 83 err = perf_evlist__create_maps(evlist, &opts.target); 84 if (err < 0) { 85 pr_debug("Not enough memory to create thread/cpu maps\n"); 86 goto out_delete_evlist; 87 } 88 89 /* 90 * Prepare the workload in argv[] to run, it'll fork it, and then wait 91 * for perf_evlist__start_workload() to exec it. This is done this way 92 * so that we have time to open the evlist (calling sys_perf_event_open 93 * on all the fds) and then mmap them. 94 */ 95 err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL); 96 if (err < 0) { 97 pr_debug("Couldn't run the workload!\n"); 98 goto out_delete_evlist; 99 } 100 101 /* 102 * Config the evsels, setting attr->comm on the first one, etc. 103 */ 104 evsel = perf_evlist__first(evlist); 105 perf_evsel__set_sample_bit(evsel, CPU); 106 perf_evsel__set_sample_bit(evsel, TID); 107 perf_evsel__set_sample_bit(evsel, TIME); 108 perf_evlist__config(evlist, &opts, NULL); 109 110 err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask); 111 if (err < 0) { 112 pr_debug("sched__get_first_possible_cpu: %s\n", 113 str_error_r(errno, sbuf, sizeof(sbuf))); 114 goto out_delete_evlist; 115 } 116 117 cpu = err; 118 119 /* 120 * So that we can check perf_sample.cpu on all the samples. 121 */ 122 if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) { 123 pr_debug("sched_setaffinity: %s\n", 124 str_error_r(errno, sbuf, sizeof(sbuf))); 125 goto out_delete_evlist; 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", 135 str_error_r(errno, sbuf, sizeof(sbuf))); 136 goto out_delete_evlist; 137 } 138 139 /* 140 * mmap the first fd on a given CPU and ask for events for the other 141 * fds in the same CPU to be injected in the same mmap ring buffer 142 * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)). 143 */ 144 err = perf_evlist__mmap(evlist, opts.mmap_pages, false); 145 if (err < 0) { 146 pr_debug("perf_evlist__mmap: %s\n", 147 str_error_r(errno, sbuf, sizeof(sbuf))); 148 goto out_delete_evlist; 149 } 150 151 /* 152 * Now that all is properly set up, enable the events, they will 153 * count just on workload.pid, which will start... 154 */ 155 perf_evlist__enable(evlist); 156 157 /* 158 * Now! 159 */ 160 perf_evlist__start_workload(evlist); 161 162 while (1) { 163 int before = total_events; 164 165 for (i = 0; i < evlist->nr_mmaps; i++) { 166 union perf_event *event; 167 168 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { 169 const u32 type = event->header.type; 170 const char *name = perf_event__name(type); 171 172 ++total_events; 173 if (type < PERF_RECORD_MAX) 174 nr_events[type]++; 175 176 err = perf_evlist__parse_sample(evlist, event, &sample); 177 if (err < 0) { 178 if (verbose > 0) 179 perf_event__fprintf(event, stderr); 180 pr_debug("Couldn't parse sample\n"); 181 goto out_delete_evlist; 182 } 183 184 if (verbose > 0) { 185 pr_info("%" PRIu64" %d ", sample.time, sample.cpu); 186 perf_event__fprintf(event, stderr); 187 } 188 189 if (prev_time > sample.time) { 190 pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n", 191 name, prev_time, sample.time); 192 ++errs; 193 } 194 195 prev_time = sample.time; 196 197 if (sample.cpu != cpu) { 198 pr_debug("%s with unexpected cpu, expected %d, got %d\n", 199 name, cpu, sample.cpu); 200 ++errs; 201 } 202 203 if ((pid_t)sample.pid != evlist->workload.pid) { 204 pr_debug("%s with unexpected pid, expected %d, got %d\n", 205 name, evlist->workload.pid, sample.pid); 206 ++errs; 207 } 208 209 if ((pid_t)sample.tid != evlist->workload.pid) { 210 pr_debug("%s with unexpected tid, expected %d, got %d\n", 211 name, evlist->workload.pid, sample.tid); 212 ++errs; 213 } 214 215 if ((type == PERF_RECORD_COMM || 216 type == PERF_RECORD_MMAP || 217 type == PERF_RECORD_MMAP2 || 218 type == PERF_RECORD_FORK || 219 type == PERF_RECORD_EXIT) && 220 (pid_t)event->comm.pid != evlist->workload.pid) { 221 pr_debug("%s with unexpected pid/tid\n", name); 222 ++errs; 223 } 224 225 if ((type == PERF_RECORD_COMM || 226 type == PERF_RECORD_MMAP || 227 type == PERF_RECORD_MMAP2) && 228 event->comm.pid != event->comm.tid) { 229 pr_debug("%s with different pid/tid!\n", name); 230 ++errs; 231 } 232 233 switch (type) { 234 case PERF_RECORD_COMM: 235 if (strcmp(event->comm.comm, cmd)) { 236 pr_debug("%s with unexpected comm!\n", name); 237 ++errs; 238 } 239 break; 240 case PERF_RECORD_EXIT: 241 goto found_exit; 242 case PERF_RECORD_MMAP: 243 mmap_filename = event->mmap.filename; 244 goto check_bname; 245 case PERF_RECORD_MMAP2: 246 mmap_filename = event->mmap2.filename; 247 check_bname: 248 bname = strrchr(mmap_filename, '/'); 249 if (bname != NULL) { 250 if (!found_cmd_mmap) 251 found_cmd_mmap = !strcmp(bname + 1, cmd); 252 if (!found_libc_mmap) 253 found_libc_mmap = !strncmp(bname + 1, "libc", 4); 254 if (!found_ld_mmap) 255 found_ld_mmap = !strncmp(bname + 1, "ld", 2); 256 } else if (!found_vdso_mmap) 257 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]"); 258 break; 259 260 case PERF_RECORD_SAMPLE: 261 /* Just ignore samples for now */ 262 break; 263 default: 264 pr_debug("Unexpected perf_event->header.type %d!\n", 265 type); 266 ++errs; 267 } 268 269 perf_evlist__mmap_consume(evlist, i); 270 } 271 } 272 273 /* 274 * We don't use poll here because at least at 3.1 times the 275 * PERF_RECORD_{!SAMPLE} events don't honour 276 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does. 277 */ 278 if (total_events == before && false) 279 perf_evlist__poll(evlist, -1); 280 281 sleep(1); 282 if (++wakeups > 5) { 283 pr_debug("No PERF_RECORD_EXIT event!\n"); 284 break; 285 } 286 } 287 288 found_exit: 289 if (nr_events[PERF_RECORD_COMM] > 1) { 290 pr_debug("Excessive number of PERF_RECORD_COMM events!\n"); 291 ++errs; 292 } 293 294 if (nr_events[PERF_RECORD_COMM] == 0) { 295 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd); 296 ++errs; 297 } 298 299 if (!found_cmd_mmap) { 300 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd); 301 ++errs; 302 } 303 304 if (!found_libc_mmap) { 305 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc"); 306 ++errs; 307 } 308 309 if (!found_ld_mmap) { 310 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld"); 311 ++errs; 312 } 313 314 if (!found_vdso_mmap) { 315 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]"); 316 ++errs; 317 } 318 out_delete_evlist: 319 perf_evlist__delete(evlist); 320 out: 321 return (err < 0 || errs > 0) ? -1 : 0; 322 } 323