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