tools/perf/builtin-buildid-cache.c

   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 }