1 /* 2 * builtin-buildid-cache.c 3 * 4 * Builtin buildid-cache command: Manages build-id cache 5 * 6 * Copyright (C) 2010, Red Hat Inc. 7 * Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com> 8 */ 9 #include <sys/types.h> 10 #include <sys/time.h> 11 #include <time.h> 12 #include <dirent.h> 13 #include <errno.h> 14 #include <unistd.h> 15 #include "builtin.h" 16 #include "perf.h" 17 #include "util/cache.h" 18 #include "util/debug.h" 19 #include "util/header.h" 20 #include <subcmd/parse-options.h> 21 #include "util/strlist.h" 22 #include "util/build-id.h" 23 #include "util/session.h" 24 #include "util/symbol.h" 25 #include "util/time-utils.h" 26 27 static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid) 28 { 29 char root_dir[PATH_MAX]; 30 char *p; 31 32 strlcpy(root_dir, proc_dir, sizeof(root_dir)); 33 34 p = strrchr(root_dir, '/'); 35 if (!p) 36 return -1; 37 *p = '\0'; 38 return sysfs__sprintf_build_id(root_dir, sbuildid); 39 } 40 41 static int build_id_cache__kcore_dir(char *dir, size_t sz) 42 { 43 return fetch_current_timestamp(dir, sz); 44 } 45 46 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir) 47 { 48 char from[PATH_MAX]; 49 char to[PATH_MAX]; 50 const char *name; 51 u64 addr1 = 0, addr2 = 0; 52 int i, err = -1; 53 54 scnprintf(from, sizeof(from), "%s/kallsyms", from_dir); 55 scnprintf(to, sizeof(to), "%s/kallsyms", to_dir); 56 57 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) { 58 err = kallsyms__get_function_start(from, name, &addr1); 59 if (!err) 60 break; 61 } 62 63 if (err) 64 return false; 65 66 if (kallsyms__get_function_start(to, name, &addr2)) 67 return false; 68 69 return addr1 == addr2; 70 } 71 72 static int build_id_cache__kcore_existing(const char *from_dir, char *to_dir, 73 size_t to_dir_sz) 74 { 75 char from[PATH_MAX]; 76 char to[PATH_MAX]; 77 char to_subdir[PATH_MAX]; 78 struct dirent *dent; 79 int ret = -1; 80 DIR *d; 81 82 d = opendir(to_dir); 83 if (!d) 84 return -1; 85 86 scnprintf(from, sizeof(from), "%s/modules", from_dir); 87 88 while (1) { 89 dent = readdir(d); 90 if (!dent) 91 break; 92 if (dent->d_type != DT_DIR) 93 continue; 94 scnprintf(to, sizeof(to), "%s/%s/modules", to_dir, 95 dent->d_name); 96 scnprintf(to_subdir, sizeof(to_subdir), "%s/%s", 97 to_dir, dent->d_name); 98 if (!compare_proc_modules(from, to) && 99 same_kallsyms_reloc(from_dir, to_subdir)) { 100 strlcpy(to_dir, to_subdir, to_dir_sz); 101 ret = 0; 102 break; 103 } 104 } 105 106 closedir(d); 107 108 return ret; 109 } 110 111 static int build_id_cache__add_kcore(const char *filename, bool force) 112 { 113 char dir[32], sbuildid[SBUILD_ID_SIZE]; 114 char from_dir[PATH_MAX], to_dir[PATH_MAX]; 115 char *p; 116 117 strlcpy(from_dir, filename, sizeof(from_dir)); 118 119 p = strrchr(from_dir, '/'); 120 if (!p || strcmp(p + 1, "kcore")) 121 return -1; 122 *p = '\0'; 123 124 if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0) 125 return -1; 126 127 scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s", 128 buildid_dir, DSO__NAME_KCORE, sbuildid); 129 130 if (!force && 131 !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) { 132 pr_debug("same kcore found in %s\n", to_dir); 133 return 0; 134 } 135 136 if (build_id_cache__kcore_dir(dir, sizeof(dir))) 137 return -1; 138 139 scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s/%s", 140 buildid_dir, DSO__NAME_KCORE, sbuildid, dir); 141 142 if (mkdir_p(to_dir, 0755)) 143 return -1; 144 145 if (kcore_copy(from_dir, to_dir)) { 146 /* Remove YYYYmmddHHMMSShh directory */ 147 if (!rmdir(to_dir)) { 148 p = strrchr(to_dir, '/'); 149 if (p) 150 *p = '\0'; 151 /* Try to remove buildid directory */ 152 if (!rmdir(to_dir)) { 153 p = strrchr(to_dir, '/'); 154 if (p) 155 *p = '\0'; 156 /* Try to remove [kernel.kcore] directory */ 157 rmdir(to_dir); 158 } 159 } 160 return -1; 161 } 162 163 pr_debug("kcore added to build-id cache directory %s\n", to_dir); 164 165 return 0; 166 } 167 168 static int build_id_cache__add_file(const char *filename) 169 { 170 char sbuild_id[SBUILD_ID_SIZE]; 171 u8 build_id[BUILD_ID_SIZE]; 172 int err; 173 174 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 175 pr_debug("Couldn't read a build-id in %s\n", filename); 176 return -1; 177 } 178 179 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 180 err = build_id_cache__add_s(sbuild_id, filename, 181 false, false); 182 pr_debug("Adding %s %s: %s\n", sbuild_id, filename, 183 err ? "FAIL" : "Ok"); 184 return err; 185 } 186 187 static int build_id_cache__remove_file(const char *filename) 188 { 189 u8 build_id[BUILD_ID_SIZE]; 190 char sbuild_id[SBUILD_ID_SIZE]; 191 192 int err; 193 194 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 195 pr_debug("Couldn't read a build-id in %s\n", filename); 196 return -1; 197 } 198 199 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 200 err = build_id_cache__remove_s(sbuild_id); 201 pr_debug("Removing %s %s: %s\n", sbuild_id, filename, 202 err ? "FAIL" : "Ok"); 203 204 return err; 205 } 206 207 static int build_id_cache__purge_path(const char *pathname) 208 { 209 struct strlist *list; 210 struct str_node *pos; 211 int err; 212 213 err = build_id_cache__list_build_ids(pathname, &list); 214 if (err) 215 goto out; 216 217 strlist__for_each_entry(pos, list) { 218 err = build_id_cache__remove_s(pos->s); 219 pr_debug("Removing %s %s: %s\n", pos->s, pathname, 220 err ? "FAIL" : "Ok"); 221 if (err) 222 break; 223 } 224 strlist__delete(list); 225 226 out: 227 pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok"); 228 229 return err; 230 } 231 232 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused) 233 { 234 char filename[PATH_MAX]; 235 u8 build_id[BUILD_ID_SIZE]; 236 237 if (dso__build_id_filename(dso, filename, sizeof(filename)) && 238 filename__read_build_id(filename, build_id, 239 sizeof(build_id)) != sizeof(build_id)) { 240 if (errno == ENOENT) 241 return false; 242 243 pr_warning("Problems with %s file, consider removing it from the cache\n", 244 filename); 245 } else if (memcmp(dso->build_id, build_id, sizeof(dso->build_id))) { 246 pr_warning("Problems with %s file, consider removing it from the cache\n", 247 filename); 248 } 249 250 return true; 251 } 252 253 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp) 254 { 255 perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0); 256 return 0; 257 } 258 259 static int build_id_cache__update_file(const char *filename) 260 { 261 u8 build_id[BUILD_ID_SIZE]; 262 char sbuild_id[SBUILD_ID_SIZE]; 263 264 int err = 0; 265 266 if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) { 267 pr_debug("Couldn't read a build-id in %s\n", filename); 268 return -1; 269 } 270 271 build_id__sprintf(build_id, sizeof(build_id), sbuild_id); 272 if (build_id_cache__cached(sbuild_id)) 273 err = build_id_cache__remove_s(sbuild_id); 274 275 if (!err) 276 err = build_id_cache__add_s(sbuild_id, filename, false, false); 277 278 pr_debug("Updating %s %s: %s\n", sbuild_id, filename, 279 err ? "FAIL" : "Ok"); 280 281 return err; 282 } 283 284 int cmd_buildid_cache(int argc, const char **argv) 285 { 286 struct strlist *list; 287 struct str_node *pos; 288 int ret = 0; 289 bool force = false; 290 char const *add_name_list_str = NULL, 291 *remove_name_list_str = NULL, 292 *purge_name_list_str = NULL, 293 *missing_filename = NULL, 294 *update_name_list_str = NULL, 295 *kcore_filename = NULL; 296 char sbuf[STRERR_BUFSIZE]; 297 298 struct perf_data_file file = { 299 .mode = PERF_DATA_MODE_READ, 300 }; 301 struct perf_session *session = NULL; 302 303 const struct option buildid_cache_options[] = { 304 OPT_STRING('a', "add", &add_name_list_str, 305 "file list", "file(s) to add"), 306 OPT_STRING('k', "kcore", &kcore_filename, 307 "file", "kcore file to add"), 308 OPT_STRING('r', "remove", &remove_name_list_str, "file list", 309 "file(s) to remove"), 310 OPT_STRING('p', "purge", &purge_name_list_str, "path list", 311 "path(s) to remove (remove old caches too)"), 312 OPT_STRING('M', "missing", &missing_filename, "file", 313 "to find missing build ids in the cache"), 314 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 315 OPT_STRING('u', "update", &update_name_list_str, "file list", 316 "file(s) to update"), 317 OPT_INCR('v', "verbose", &verbose, "be more verbose"), 318 OPT_END() 319 }; 320 const char * const buildid_cache_usage[] = { 321 "perf buildid-cache [<options>]", 322 NULL 323 }; 324 325 argc = parse_options(argc, argv, buildid_cache_options, 326 buildid_cache_usage, 0); 327 328 if (argc || (!add_name_list_str && !kcore_filename && 329 !remove_name_list_str && !purge_name_list_str && 330 !missing_filename && !update_name_list_str)) 331 usage_with_options(buildid_cache_usage, buildid_cache_options); 332 333 if (missing_filename) { 334 file.path = missing_filename; 335 file.force = force; 336 337 session = perf_session__new(&file, false, NULL); 338 if (session == NULL) 339 return -1; 340 } 341 342 if (symbol__init(session ? &session->header.env : NULL) < 0) 343 goto out; 344 345 setup_pager(); 346 347 if (add_name_list_str) { 348 list = strlist__new(add_name_list_str, NULL); 349 if (list) { 350 strlist__for_each_entry(pos, list) 351 if (build_id_cache__add_file(pos->s)) { 352 if (errno == EEXIST) { 353 pr_debug("%s already in the cache\n", 354 pos->s); 355 continue; 356 } 357 pr_warning("Couldn't add %s: %s\n", 358 pos->s, str_error_r(errno, sbuf, sizeof(sbuf))); 359 } 360 361 strlist__delete(list); 362 } 363 } 364 365 if (remove_name_list_str) { 366 list = strlist__new(remove_name_list_str, NULL); 367 if (list) { 368 strlist__for_each_entry(pos, list) 369 if (build_id_cache__remove_file(pos->s)) { 370 if (errno == ENOENT) { 371 pr_debug("%s wasn't in the cache\n", 372 pos->s); 373 continue; 374 } 375 pr_warning("Couldn't remove %s: %s\n", 376 pos->s, str_error_r(errno, sbuf, sizeof(sbuf))); 377 } 378 379 strlist__delete(list); 380 } 381 } 382 383 if (purge_name_list_str) { 384 list = strlist__new(purge_name_list_str, NULL); 385 if (list) { 386 strlist__for_each_entry(pos, list) 387 if (build_id_cache__purge_path(pos->s)) { 388 if (errno == ENOENT) { 389 pr_debug("%s wasn't in the cache\n", 390 pos->s); 391 continue; 392 } 393 pr_warning("Couldn't remove %s: %s\n", 394 pos->s, str_error_r(errno, sbuf, sizeof(sbuf))); 395 } 396 397 strlist__delete(list); 398 } 399 } 400 401 if (missing_filename) 402 ret = build_id_cache__fprintf_missing(session, stdout); 403 404 if (update_name_list_str) { 405 list = strlist__new(update_name_list_str, NULL); 406 if (list) { 407 strlist__for_each_entry(pos, list) 408 if (build_id_cache__update_file(pos->s)) { 409 if (errno == ENOENT) { 410 pr_debug("%s wasn't in the cache\n", 411 pos->s); 412 continue; 413 } 414 pr_warning("Couldn't update %s: %s\n", 415 pos->s, str_error_r(errno, sbuf, sizeof(sbuf))); 416 } 417 418 strlist__delete(list); 419 } 420 } 421 422 if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force)) 423 pr_warning("Couldn't add %s\n", kcore_filename); 424 425 out: 426 perf_session__delete(session); 427 428 return ret; 429 } 430