1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <linux/string.h> 5 /* For the CLR_() macros */ 6 #include <pthread.h> 7 8 #include <sched.h> 9 #include "evlist.h" 10 #include "evsel.h" 11 #include "debug.h" 12 #include "record.h" 13 #include "tests.h" 14 #include "util/mmap.h" 15 16 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t *maskp) 17 { 18 int i, cpu = -1, nrcpus = 1024; 19 realloc: 20 CPU_ZERO(maskp); 21 22 if (sched_getaffinity(pid, sizeof(*maskp), maskp) == -1) { 23 if (errno == EINVAL && nrcpus < (1024 << 8)) { 24 nrcpus = nrcpus << 2; 25 goto realloc; 26 } 27 perror("sched_getaffinity"); 28 return -1; 29 } 30 31 for (i = 0; i < nrcpus; i++) { 32 if (CPU_ISSET(i, maskp)) { 33 if (cpu == -1) 34 cpu = i; 35 else 36 CPU_CLR(i, maskp); 37 } 38 } 39 40 return cpu; 41 } 42 43 int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unused) 44 { 45 struct record_opts opts = { 46 .target = { 47 .uid = UINT_MAX, 48 .uses_mmap = true, 49 }, 50 .no_buffering = true, 51 .mmap_pages = 256, 52 }; 53 cpu_set_t cpu_mask; 54 size_t cpu_mask_size = sizeof(cpu_mask); 55 struct evlist *evlist = perf_evlist__new_dummy(); 56 struct evsel *evsel; 57 struct perf_sample sample; 58 const char *cmd = "sleep"; 59 const char *argv[] = { cmd, "1", NULL, }; 60 char *bname, *mmap_filename; 61 u64 prev_time = 0; 62 bool found_cmd_mmap = false, 63 found_coreutils_mmap = false, 64 found_libc_mmap = false, 65 found_vdso_mmap = false, 66 found_ld_mmap = false; 67 int err = -1, errs = 0, i, wakeups = 0; 68 u32 cpu; 69 int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, }; 70 char sbuf[STRERR_BUFSIZE]; 71 72 if (evlist == NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUMMY */ 73 evlist = perf_evlist__new_default(); 74 75 if (evlist == NULL) { 76 pr_debug("Not enough memory to create evlist\n"); 77 goto out; 78 } 79 80 /* 81 * Create maps of threads and cpus to monitor. In this case 82 * we start with all threads and cpus (-1, -1) but then in 83 * perf_evlist__prepare_workload we'll fill in the only thread 84 * we're monitoring, the one forked there. 85 */ 86 err = perf_evlist__create_maps(evlist, &opts.target); 87 if (err < 0) { 88 pr_debug("Not enough memory to create thread/cpu maps\n"); 89 goto out_delete_evlist; 90 } 91 92 /* 93 * Prepare the workload in argv[] to run, it'll fork it, and then wait 94 * for perf_evlist__start_workload() to exec it. This is done this way 95 * so that we have time to open the evlist (calling sys_perf_event_open 96 * on all the fds) and then mmap them. 97 */ 98 err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL); 99 if (err < 0) { 100 pr_debug("Couldn't run the workload!\n"); 101 goto out_delete_evlist; 102 } 103 104 /* 105 * Config the evsels, setting attr->comm on the first one, etc. 106 */ 107 evsel = evlist__first(evlist); 108 perf_evsel__set_sample_bit(evsel, CPU); 109 perf_evsel__set_sample_bit(evsel, TID); 110 perf_evsel__set_sample_bit(evsel, TIME); 111 perf_evlist__config(evlist, &opts, NULL); 112 113 err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask); 114 if (err < 0) { 115 pr_debug("sched__get_first_possible_cpu: %s\n", 116 str_error_r(errno, sbuf, sizeof(sbuf))); 117 goto out_delete_evlist; 118 } 119 120 cpu = err; 121 122 /* 123 * So that we can check perf_sample.cpu on all the samples. 124 */ 125 if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) { 126 pr_debug("sched_setaffinity: %s\n", 127 str_error_r(errno, sbuf, sizeof(sbuf))); 128 goto out_delete_evlist; 129 } 130 131 /* 132 * Call sys_perf_event_open on all the fds on all the evsels, 133 * grouping them if asked to. 134 */ 135 err = evlist__open(evlist); 136 if (err < 0) { 137 pr_debug("perf_evlist__open: %s\n", 138 str_error_r(errno, sbuf, sizeof(sbuf))); 139 goto out_delete_evlist; 140 } 141 142 /* 143 * mmap the first fd on a given CPU and ask for events for the other 144 * fds in the same CPU to be injected in the same mmap ring buffer 145 * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)). 146 */ 147 err = evlist__mmap(evlist, opts.mmap_pages); 148 if (err < 0) { 149 pr_debug("evlist__mmap: %s\n", 150 str_error_r(errno, sbuf, sizeof(sbuf))); 151 goto out_delete_evlist; 152 } 153 154 /* 155 * Now that all is properly set up, enable the events, they will 156 * count just on workload.pid, which will start... 157 */ 158 evlist__enable(evlist); 159 160 /* 161 * Now! 162 */ 163 perf_evlist__start_workload(evlist); 164 165 while (1) { 166 int before = total_events; 167 168 for (i = 0; i < evlist->core.nr_mmaps; i++) { 169 union perf_event *event; 170 struct mmap *md; 171 172 md = &evlist->mmap[i]; 173 if (perf_mmap__read_init(md) < 0) 174 continue; 175 176 while ((event = perf_mmap__read_event(md)) != NULL) { 177 const u32 type = event->header.type; 178 const char *name = perf_event__name(type); 179 180 ++total_events; 181 if (type < PERF_RECORD_MAX) 182 nr_events[type]++; 183 184 err = perf_evlist__parse_sample(evlist, event, &sample); 185 if (err < 0) { 186 if (verbose > 0) 187 perf_event__fprintf(event, stderr); 188 pr_debug("Couldn't parse sample\n"); 189 goto out_delete_evlist; 190 } 191 192 if (verbose > 0) { 193 pr_info("%" PRIu64" %d ", sample.time, sample.cpu); 194 perf_event__fprintf(event, stderr); 195 } 196 197 if (prev_time > sample.time) { 198 pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n", 199 name, prev_time, sample.time); 200 ++errs; 201 } 202 203 prev_time = sample.time; 204 205 if (sample.cpu != cpu) { 206 pr_debug("%s with unexpected cpu, expected %d, got %d\n", 207 name, cpu, sample.cpu); 208 ++errs; 209 } 210 211 if ((pid_t)sample.pid != evlist->workload.pid) { 212 pr_debug("%s with unexpected pid, expected %d, got %d\n", 213 name, evlist->workload.pid, sample.pid); 214 ++errs; 215 } 216 217 if ((pid_t)sample.tid != evlist->workload.pid) { 218 pr_debug("%s with unexpected tid, expected %d, got %d\n", 219 name, evlist->workload.pid, sample.tid); 220 ++errs; 221 } 222 223 if ((type == PERF_RECORD_COMM || 224 type == PERF_RECORD_MMAP || 225 type == PERF_RECORD_MMAP2 || 226 type == PERF_RECORD_FORK || 227 type == PERF_RECORD_EXIT) && 228 (pid_t)event->comm.pid != evlist->workload.pid) { 229 pr_debug("%s with unexpected pid/tid\n", name); 230 ++errs; 231 } 232 233 if ((type == PERF_RECORD_COMM || 234 type == PERF_RECORD_MMAP || 235 type == PERF_RECORD_MMAP2) && 236 event->comm.pid != event->comm.tid) { 237 pr_debug("%s with different pid/tid!\n", name); 238 ++errs; 239 } 240 241 switch (type) { 242 case PERF_RECORD_COMM: 243 if (strcmp(event->comm.comm, cmd)) { 244 pr_debug("%s with unexpected comm!\n", name); 245 ++errs; 246 } 247 break; 248 case PERF_RECORD_EXIT: 249 goto found_exit; 250 case PERF_RECORD_MMAP: 251 mmap_filename = event->mmap.filename; 252 goto check_bname; 253 case PERF_RECORD_MMAP2: 254 mmap_filename = event->mmap2.filename; 255 check_bname: 256 bname = strrchr(mmap_filename, '/'); 257 if (bname != NULL) { 258 if (!found_cmd_mmap) 259 found_cmd_mmap = !strcmp(bname + 1, cmd); 260 if (!found_coreutils_mmap) 261 found_coreutils_mmap = !strcmp(bname + 1, "coreutils"); 262 if (!found_libc_mmap) 263 found_libc_mmap = !strncmp(bname + 1, "libc", 4); 264 if (!found_ld_mmap) 265 found_ld_mmap = !strncmp(bname + 1, "ld", 2); 266 } else if (!found_vdso_mmap) 267 found_vdso_mmap = !strcmp(mmap_filename, "[vdso]"); 268 break; 269 270 case PERF_RECORD_SAMPLE: 271 /* Just ignore samples for now */ 272 break; 273 default: 274 pr_debug("Unexpected perf_event->header.type %d!\n", 275 type); 276 ++errs; 277 } 278 279 perf_mmap__consume(md); 280 } 281 perf_mmap__read_done(md); 282 } 283 284 /* 285 * We don't use poll here because at least at 3.1 times the 286 * PERF_RECORD_{!SAMPLE} events don't honour 287 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does. 288 */ 289 if (total_events == before && false) 290 evlist__poll(evlist, -1); 291 292 sleep(1); 293 if (++wakeups > 5) { 294 pr_debug("No PERF_RECORD_EXIT event!\n"); 295 break; 296 } 297 } 298 299 found_exit: 300 if (nr_events[PERF_RECORD_COMM] > 1 + !!found_coreutils_mmap) { 301 pr_debug("Excessive number of PERF_RECORD_COMM events!\n"); 302 ++errs; 303 } 304 305 if (nr_events[PERF_RECORD_COMM] == 0) { 306 pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd); 307 ++errs; 308 } 309 310 if (!found_cmd_mmap && !found_coreutils_mmap) { 311 pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd); 312 ++errs; 313 } 314 315 if (!found_libc_mmap) { 316 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc"); 317 ++errs; 318 } 319 320 if (!found_ld_mmap) { 321 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld"); 322 ++errs; 323 } 324 325 if (!found_vdso_mmap) { 326 pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]"); 327 ++errs; 328 } 329 out_delete_evlist: 330 evlist__delete(evlist); 331 out: 332 return (err < 0 || errs > 0) ? -1 : 0; 333 } 334