Documentation/vm/slabinfo.c

   1 /*
   2  * Slabinfo: Tool to get reports about slabs
   3  *
   4  * (C) 2007 sgi, Christoph Lameter <clameter@sgi.com>
   5  *
   6  * Compile by:
   7  *
   8  * gcc -o slabinfo slabinfo.c
   9  */
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <sys/types.h>
  13 #include <dirent.h>
  14 #include <strings.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <stdarg.h>
  18 #include <getopt.h>
  19 #include <regex.h>
  20 #include <errno.h>
  21
  22 #define MAX_SLABS 500
  23 #define MAX_ALIASES 500
  24 #define MAX_NODES 1024
  25
  26 struct slabinfo {
  27         char *name;
  28         int alias;
  29         int refs;
  30         int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
  31         int hwcache_align, object_size, objs_per_slab;
  32         int sanity_checks, slab_size, store_user, trace;
  33         int order, poison, reclaim_account, red_zone;
  34         unsigned long partial, objects, slabs, objects_partial, objects_total;
  35         unsigned long alloc_fastpath, alloc_slowpath;
  36         unsigned long free_fastpath, free_slowpath;
  37         unsigned long free_frozen, free_add_partial, free_remove_partial;
  38         unsigned long alloc_from_partial, alloc_slab, free_slab, alloc_refill;
  39         unsigned long cpuslab_flush, deactivate_full, deactivate_empty;
  40         unsigned long deactivate_to_head, deactivate_to_tail;
  41         unsigned long deactivate_remote_frees;
  42         int numa[MAX_NODES];
  43         int numa_partial[MAX_NODES];
  44 } slabinfo[MAX_SLABS];
  45
  46 struct aliasinfo {
  47         char *name;
  48         char *ref;
  49         struct slabinfo *slab;
  50 } aliasinfo[MAX_ALIASES];
  51
  52 int slabs = 0;
  53 int actual_slabs = 0;
  54 int aliases = 0;
  55 int alias_targets = 0;
  56 int highest_node = 0;
  57
  58 char buffer[4096];
  59
  60 int show_empty = 0;
  61 int show_report = 0;
  62 int show_alias = 0;
  63 int show_slab = 0;
  64 int skip_zero = 1;
  65 int show_numa = 0;
  66 int show_track = 0;
  67 int show_first_alias = 0;
  68 int validate = 0;
  69 int shrink = 0;
  70 int show_inverted = 0;
  71 int show_single_ref = 0;
  72 int show_totals = 0;
  73 int sort_size = 0;
  74 int sort_active = 0;
  75 int set_debug = 0;
  76 int show_ops = 0;
  77 int show_activity = 0;
  78
  79 /* Debug options */
  80 int sanity = 0;
  81 int redzone = 0;
  82 int poison = 0;
  83 int tracking = 0;
  84 int tracing = 0;
  85
  86 int page_size;
  87
  88 regex_t pattern;
  89
  90 void fatal(const char *x, ...)
  91 {
  92         va_list ap;
  93
  94         va_start(ap, x);
  95         vfprintf(stderr, x, ap);
  96         va_end(ap);
  97         exit(EXIT_FAILURE);
  98 }
  99
 100 void usage(void)
 101 {
 102         printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\n\n"
 103                 "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
 104                 "-a|--aliases           Show aliases\n"
 105                 "-A|--activity          Most active slabs first\n"
 106                 "-d<options>|--debug=<options> Set/Clear Debug options\n"
 107                 "-D|--display-active    Switch line format to activity\n"
 108                 "-e|--empty             Show empty slabs\n"
 109                 "-f|--first-alias       Show first alias\n"
 110                 "-h|--help              Show usage information\n"
 111                 "-i|--inverted          Inverted list\n"
 112                 "-l|--slabs             Show slabs\n"
 113                 "-n|--numa              Show NUMA information\n"
 114                 "-o|--ops               Show kmem_cache_ops\n"
 115                 "-s|--shrink            Shrink slabs\n"
 116                 "-r|--report            Detailed report on single slabs\n"
 117                 "-S|--Size              Sort by size\n"
 118                 "-t|--tracking          Show alloc/free information\n"
 119                 "-T|--Totals            Show summary information\n"
 120                 "-v|--validate          Validate slabs\n"
 121                 "-z|--zero              Include empty slabs\n"
 122                 "-1|--1ref              Single reference\n"
 123                 "\nValid debug options (FZPUT may be combined)\n"
 124                 "a / A          Switch on all debug options (=FZUP)\n"
 125                 "-              Switch off all debug options\n"
 126                 "f / F          Sanity Checks (SLAB_DEBUG_FREE)\n"
 127                 "z / Z          Redzoning\n"
 128                 "p / P          Poisoning\n"
 129                 "u / U          Tracking\n"
 130                 "t / T          Tracing\n"
 131         );
 132 }
 133
 134 unsigned long read_obj(const char *name)
 135 {
 136         FILE *f = fopen(name, "r");
 137
 138         if (!f)
 139                 buffer[0] = 0;
 140         else {
 141                 if (!fgets(buffer, sizeof(buffer), f))
 142                         buffer[0] = 0;
 143                 fclose(f);
 144                 if (buffer[strlen(buffer)] == '\n')
 145                         buffer[strlen(buffer)] = 0;
 146         }
 147         return strlen(buffer);
 148 }
 149
 150
 151 /*
 152  * Get the contents of an attribute
 153  */
 154 unsigned long get_obj(const char *name)
 155 {
 156         if (!read_obj(name))
 157                 return 0;
 158
 159         return atol(buffer);
 160 }
 161
 162 unsigned long get_obj_and_str(const char *name, char **x)
 163 {
 164         unsigned long result = 0;
 165         char *p;
 166
 167         *x = NULL;
 168
 169         if (!read_obj(name)) {
 170                 x = NULL;
 171                 return 0;
 172         }
 173         result = strtoul(buffer, &p, 10);
 174         while (*p == ' ')
 175                 p++;
 176         if (*p)
 177                 *x = strdup(p);
 178         return result;
 179 }
 180
 181 void set_obj(struct slabinfo *s, const char *name, int n)
 182 {
 183         char x[100];
 184         FILE *f;
 185
 186         snprintf(x, 100, "%s/%s", s->name, name);
 187         f = fopen(x, "w");
 188         if (!f)
 189                 fatal("Cannot write to %s\n", x);
 190
 191         fprintf(f, "%d\n", n);
 192         fclose(f);
 193 }
 194
 195 unsigned long read_slab_obj(struct slabinfo *s, const char *name)
 196 {
 197         char x[100];
 198         FILE *f;
 199         size_t l;
 200
 201         snprintf(x, 100, "%s/%s", s->name, name);
 202         f = fopen(x, "r");
 203         if (!f) {
 204                 buffer[0] = 0;
 205                 l = 0;
 206         } else {
 207                 l = fread(buffer, 1, sizeof(buffer), f);
 208                 buffer[l] = 0;
 209                 fclose(f);
 210         }
 211         return l;
 212 }
 213
 214
 215 /*
 216  * Put a size string together
 217  */
 218 int store_size(char *buffer, unsigned long value)
 219 {
 220         unsigned long divisor = 1;
 221         char trailer = 0;
 222         int n;
 223
 224         if (value > 1000000000UL) {
 225                 divisor = 100000000UL;
 226                 trailer = 'G';
 227         } else if (value > 1000000UL) {
 228                 divisor = 100000UL;
 229                 trailer = 'M';
 230         } else if (value > 1000UL) {
 231                 divisor = 100;
 232                 trailer = 'K';
 233         }
 234
 235         value /= divisor;
 236         n = sprintf(buffer, "%ld",value);
 237         if (trailer) {
 238                 buffer[n] = trailer;
 239                 n++;
 240                 buffer[n] = 0;
 241         }
 242         if (divisor != 1) {
 243                 memmove(buffer + n - 2, buffer + n - 3, 4);
 244                 buffer[n-2] = '.';
 245                 n++;
 246         }
 247         return n;
 248 }
 249
 250 void decode_numa_list(int *numa, char *t)
 251 {
 252         int node;
 253         int nr;
 254
 255         memset(numa, 0, MAX_NODES * sizeof(int));
 256
 257         if (!t)
 258                 return;
 259
 260         while (*t == 'N') {
 261                 t++;
 262                 node = strtoul(t, &t, 10);
 263                 if (*t == '=') {
 264                         t++;
 265                         nr = strtoul(t, &t, 10);
 266                         numa[node] = nr;
 267                         if (node > highest_node)
 268                                 highest_node = node;
 269                 }
 270                 while (*t == ' ')
 271                         t++;
 272         }
 273 }
 274
 275 void slab_validate(struct slabinfo *s)
 276 {
 277         if (strcmp(s->name, "*") == 0)
 278                 return;
 279
 280         set_obj(s, "validate", 1);
 281 }
 282
 283 void slab_shrink(struct slabinfo *s)
 284 {
 285         if (strcmp(s->name, "*") == 0)
 286                 return;
 287
 288         set_obj(s, "shrink", 1);
 289 }
 290
 291 int line = 0;
 292
 293 void first_line(void)
 294 {
 295         if (show_activity)
 296                 printf("Name                   Objects    Alloc     Free   %%Fast\n");
 297         else
 298                 printf("Name                   Objects Objsize    Space "
 299                         "Slabs/Part/Cpu  O/S O %%Fr %%Ef Flg\n");
 300 }
 301
 302 /*
 303  * Find the shortest alias of a slab
 304  */
 305 struct aliasinfo *find_one_alias(struct slabinfo *find)
 306 {
 307         struct aliasinfo *a;
 308         struct aliasinfo *best = NULL;
 309
 310         for(a = aliasinfo;a < aliasinfo + aliases; a++) {
 311                 if (a->slab == find &&
 312                         (!best || strlen(best->name) < strlen(a->name))) {
 313                                 best = a;
 314                                 if (strncmp(a->name,"kmall", 5) == 0)
 315                                         return best;
 316                         }
 317         }
 318         return best;
 319 }
 320
 321 unsigned long slab_size(struct slabinfo *s)
 322 {
 323         return  s->slabs * (page_size << s->order);
 324 }
 325
 326 unsigned long slab_activity(struct slabinfo *s)
 327 {
 328         return  s->alloc_fastpath + s->free_fastpath +
 329                 s->alloc_slowpath + s->free_slowpath;
 330 }
 331
 332 void slab_numa(struct slabinfo *s, int mode)
 333 {
 334         int node;
 335
 336         if (strcmp(s->name, "*") == 0)
 337                 return;
 338
 339         if (!highest_node) {
 340                 printf("\n%s: No NUMA information available.\n", s->name);
 341                 return;
 342         }
 343
 344         if (skip_zero && !s->slabs)
 345                 return;
 346
 347         if (!line) {
 348                 printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
 349                 for(node = 0; node <= highest_node; node++)
 350                         printf(" %4d", node);
 351                 printf("\n----------------------");
 352                 for(node = 0; node <= highest_node; node++)
 353                         printf("-----");
 354                 printf("\n");
 355         }
 356         printf("%-21s ", mode ? "All slabs" : s->name);
 357         for(node = 0; node <= highest_node; node++) {
 358                 char b[20];
 359
 360                 store_size(b, s->numa[node]);
 361                 printf(" %4s", b);
 362         }
 363         printf("\n");
 364         if (mode) {
 365                 printf("%-21s ", "Partial slabs");
 366                 for(node = 0; node <= highest_node; node++) {
 367                         char b[20];
 368
 369                         store_size(b, s->numa_partial[node]);
 370                         printf(" %4s", b);
 371                 }
 372                 printf("\n");
 373         }
 374         line++;
 375 }
 376
 377 void show_tracking(struct slabinfo *s)
 378 {
 379         printf("\n%s: Kernel object allocation\n", s->name);
 380         printf("-----------------------------------------------------------------------\n");
 381         if (read_slab_obj(s, "alloc_calls"))
 382                 printf(buffer);
 383         else
 384                 printf("No Data\n");
 385
 386         printf("\n%s: Kernel object freeing\n", s->name);
 387         printf("------------------------------------------------------------------------\n");
 388         if (read_slab_obj(s, "free_calls"))
 389                 printf(buffer);
 390         else
 391                 printf("No Data\n");
 392
 393 }
 394
 395 void ops(struct slabinfo *s)
 396 {
 397         if (strcmp(s->name, "*") == 0)
 398                 return;
 399
 400         if (read_slab_obj(s, "ops")) {
 401                 printf("\n%s: kmem_cache operations\n", s->name);
 402                 printf("--------------------------------------------\n");
 403                 printf(buffer);
 404         } else
 405                 printf("\n%s has no kmem_cache operations\n", s->name);
 406 }
 407
 408 const char *onoff(int x)
 409 {
 410         if (x)
 411                 return "On ";
 412         return "Off";
 413 }
 414
 415 void slab_stats(struct slabinfo *s)
 416 {
 417         unsigned long total_alloc;
 418         unsigned long total_free;
 419         unsigned long total;
 420
 421         if (!s->alloc_slab)
 422                 return;
 423
 424         total_alloc = s->alloc_fastpath + s->alloc_slowpath;
 425         total_free = s->free_fastpath + s->free_slowpath;
 426
 427         if (!total_alloc)
 428                 return;
 429
 430         printf("\n");
 431         printf("Slab Perf Counter       Alloc     Free %%Al %%Fr\n");
 432         printf("--------------------------------------------------\n");
 433         printf("Fastpath             %8lu %8lu %3lu %3lu\n",
 434                 s->alloc_fastpath, s->free_fastpath,
 435                 s->alloc_fastpath * 100 / total_alloc,
 436                 s->free_fastpath * 100 / total_free);
 437         printf("Slowpath             %8lu %8lu %3lu %3lu\n",
 438                 total_alloc - s->alloc_fastpath, s->free_slowpath,
 439                 (total_alloc - s->alloc_fastpath) * 100 / total_alloc,
 440                 s->free_slowpath * 100 / total_free);
 441         printf("Page Alloc           %8lu %8lu %3lu %3lu\n",
 442                 s->alloc_slab, s->free_slab,
 443                 s->alloc_slab * 100 / total_alloc,
 444                 s->free_slab * 100 / total_free);
 445         printf("Add partial          %8lu %8lu %3lu %3lu\n",
 446                 s->deactivate_to_head + s->deactivate_to_tail,
 447                 s->free_add_partial,
 448                 (s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
 449                 s->free_add_partial * 100 / total_free);
 450         printf("Remove partial       %8lu %8lu %3lu %3lu\n",
 451                 s->alloc_from_partial, s->free_remove_partial,
 452                 s->alloc_from_partial * 100 / total_alloc,
 453                 s->free_remove_partial * 100 / total_free);
 454
 455         printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
 456                 s->deactivate_remote_frees, s->free_frozen,
 457                 s->deactivate_remote_frees * 100 / total_alloc,
 458                 s->free_frozen * 100 / total_free);
 459
 460         printf("Total                %8lu %8lu\n\n", total_alloc, total_free);
 461
 462         if (s->cpuslab_flush)
 463                 printf("Flushes %8lu\n", s->cpuslab_flush);
 464
 465         if (s->alloc_refill)
 466                 printf("Refill %8lu\n", s->alloc_refill);
 467
 468         total = s->deactivate_full + s->deactivate_empty +
 469                         s->deactivate_to_head + s->deactivate_to_tail;
 470
 471         if (total)
 472                 printf("Deactivate Full=%lu(%lu%%) Empty=%lu(%lu%%) "
 473                         "ToHead=%lu(%lu%%) ToTail=%lu(%lu%%)\n",
 474                         s->deactivate_full, (s->deactivate_full * 100) / total,
 475                         s->deactivate_empty, (s->deactivate_empty * 100) / total,
 476                         s->deactivate_to_head, (s->deactivate_to_head * 100) / total,
 477                         s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
 478 }
 479
 480 void report(struct slabinfo *s)
 481 {
 482         if (strcmp(s->name, "*") == 0)
 483                 return;
 484
 485         printf("\nSlabcache: %-20s  Aliases: %2d Order : %2d Objects: %lu\n",
 486                 s->name, s->aliases, s->order, s->objects);
 487         if (s->hwcache_align)
 488                 printf("** Hardware cacheline aligned\n");
 489         if (s->cache_dma)
 490                 printf("** Memory is allocated in a special DMA zone\n");
 491         if (s->destroy_by_rcu)
 492                 printf("** Slabs are destroyed via RCU\n");
 493         if (s->reclaim_account)
 494                 printf("** Reclaim accounting active\n");
 495
 496         printf("\nSizes (bytes)     Slabs              Debug                Memory\n");
 497         printf("------------------------------------------------------------------------\n");
 498         printf("Object : %7d  Total  : %7ld   Sanity Checks : %s  Total: %7ld\n",
 499                         s->object_size, s->slabs, onoff(s->sanity_checks),
 500                         s->slabs * (page_size << s->order));
 501         printf("SlabObj: %7d  Full   : %7ld   Redzoning     : %s  Used : %7ld\n",
 502                         s->slab_size, s->slabs - s->partial - s->cpu_slabs,
 503                         onoff(s->red_zone), s->objects * s->object_size);
 504         printf("SlabSiz: %7d  Partial: %7ld   Poisoning     : %s  Loss : %7ld\n",
 505                         page_size << s->order, s->partial, onoff(s->poison),
 506                         s->slabs * (page_size << s->order) - s->objects * s->object_size);
 507         printf("Loss   : %7d  CpuSlab: %7d   Tracking      : %s  Lalig: %7ld\n",
 508                         s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
 509                         (s->slab_size - s->object_size) * s->objects);
 510         printf("Align  : %7d  Objects: %7d   Tracing       : %s  Lpadd: %7ld\n",
 511                         s->align, s->objs_per_slab, onoff(s->trace),
 512                         ((page_size << s->order) - s->objs_per_slab * s->slab_size) *
 513                         s->slabs);
 514
 515         ops(s);
 516         show_tracking(s);
 517         slab_numa(s, 1);
 518         slab_stats(s);
 519 }
 520
 521 void slabcache(struct slabinfo *s)
 522 {
 523         char size_str[20];
 524         char dist_str[40];
 525         char flags[20];
 526         char *p = flags;
 527
 528         if (strcmp(s->name, "*") == 0)
 529                 return;
 530
 531         if (actual_slabs == 1) {
 532                 report(s);
 533                 return;
 534         }
 535
 536         if (skip_zero && !show_empty && !s->slabs)
 537                 return;
 538
 539         if (show_empty && s->slabs)
 540                 return;
 541
 542         store_size(size_str, slab_size(s));
 543         snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs - s->cpu_slabs,
 544                                                 s->partial, s->cpu_slabs);
 545
 546         if (!line++)
 547                 first_line();
 548
 549         if (s->aliases)
 550                 *p++ = '*';
 551         if (s->cache_dma)
 552                 *p++ = 'd';
 553         if (s->hwcache_align)
 554                 *p++ = 'A';
 555         if (s->poison)
 556                 *p++ = 'P';
 557         if (s->reclaim_account)
 558                 *p++ = 'a';
 559         if (s->red_zone)
 560                 *p++ = 'Z';
 561         if (s->sanity_checks)
 562                 *p++ = 'F';
 563         if (s->store_user)
 564                 *p++ = 'U';
 565         if (s->trace)
 566                 *p++ = 'T';
 567
 568         *p = 0;
 569         if (show_activity) {
 570                 unsigned long total_alloc;
 571                 unsigned long total_free;
 572
 573                 total_alloc = s->alloc_fastpath + s->alloc_slowpath;
 574                 total_free = s->free_fastpath + s->free_slowpath;
 575
 576                 printf("%-21s %8ld %8ld %8ld %3ld %3ld \n",
 577                         s->name, s->objects,
 578                         total_alloc, total_free,
 579                         total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
 580                         total_free ? (s->free_fastpath * 100 / total_free) : 0);
 581         }
 582         else
 583                 printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
 584                         s->name, s->objects, s->object_size, size_str, dist_str,
 585                         s->objs_per_slab, s->order,
 586                         s->slabs ? (s->partial * 100) / s->slabs : 100,
 587                         s->slabs ? (s->objects * s->object_size * 100) /
 588                                 (s->slabs * (page_size << s->order)) : 100,
 589                         flags);
 590 }
 591
 592 /*
 593  * Analyze debug options. Return false if something is amiss.
 594  */
 595 int debug_opt_scan(char *opt)
 596 {
 597         if (!opt || !opt[0] || strcmp(opt, "-") == 0)
 598                 return 1;
 599
 600         if (strcasecmp(opt, "a") == 0) {
 601                 sanity = 1;
 602                 poison = 1;
 603                 redzone = 1;
 604                 tracking = 1;
 605                 return 1;
 606         }
 607
 608         for ( ; *opt; opt++)
 609                 switch (*opt) {
 610                 case 'F' : case 'f':
 611                         if (sanity)
 612                                 return 0;
 613                         sanity = 1;
 614                         break;
 615                 case 'P' : case 'p':
 616                         if (poison)
 617                                 return 0;
 618                         poison = 1;
 619                         break;
 620
 621                 case 'Z' : case 'z':
 622                         if (redzone)
 623                                 return 0;
 624                         redzone = 1;
 625                         break;
 626
 627                 case 'U' : case 'u':
 628                         if (tracking)
 629                                 return 0;
 630                         tracking = 1;
 631                         break;
 632
 633                 case 'T' : case 't':
 634                         if (tracing)
 635                                 return 0;
 636                         tracing = 1;
 637                         break;
 638                 default:
 639                         return 0;
 640                 }
 641         return 1;
 642 }
 643
 644 int slab_empty(struct slabinfo *s)
 645 {
 646         if (s->objects > 0)
 647                 return 0;
 648
 649         /*
 650          * We may still have slabs even if there are no objects. Shrinking will
 651          * remove them.
 652          */
 653         if (s->slabs != 0)
 654                 set_obj(s, "shrink", 1);
 655
 656         return 1;
 657 }
 658
 659 void slab_debug(struct slabinfo *s)
 660 {
 661         if (strcmp(s->name, "*") == 0)
 662                 return;
 663
 664         if (sanity && !s->sanity_checks) {
 665                 set_obj(s, "sanity", 1);
 666         }
 667         if (!sanity && s->sanity_checks) {
 668                 if (slab_empty(s))
 669                         set_obj(s, "sanity", 0);
 670                 else
 671                         fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
 672         }
 673         if (redzone && !s->red_zone) {
 674                 if (slab_empty(s))
 675                         set_obj(s, "red_zone", 1);
 676                 else
 677                         fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
 678         }
 679         if (!redzone && s->red_zone) {
 680                 if (slab_empty(s))
 681                         set_obj(s, "red_zone", 0);
 682                 else
 683                         fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
 684         }
 685         if (poison && !s->poison) {
 686                 if (slab_empty(s))
 687                         set_obj(s, "poison", 1);
 688                 else
 689                         fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
 690         }
 691         if (!poison && s->poison) {
 692                 if (slab_empty(s))
 693                         set_obj(s, "poison", 0);
 694                 else
 695                         fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
 696         }
 697         if (tracking && !s->store_user) {
 698                 if (slab_empty(s))
 699                         set_obj(s, "store_user", 1);
 700                 else
 701                         fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
 702         }
 703         if (!tracking && s->store_user) {
 704                 if (slab_empty(s))
 705                         set_obj(s, "store_user", 0);
 706                 else
 707                         fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
 708         }
 709         if (tracing && !s->trace) {
 710                 if (slabs == 1)
 711                         set_obj(s, "trace", 1);
 712                 else
 713                         fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
 714         }
 715         if (!tracing && s->trace)
 716                 set_obj(s, "trace", 1);
 717 }
 718
 719 void totals(void)
 720 {
 721         struct slabinfo *s;
 722
 723         int used_slabs = 0;
 724         char b1[20], b2[20], b3[20], b4[20];
 725         unsigned long long max = 1ULL << 63;
 726
 727         /* Object size */
 728         unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
 729
 730         /* Number of partial slabs in a slabcache */
 731         unsigned long long min_partial = max, max_partial = 0,
 732                                 avg_partial, total_partial = 0;
 733
 734         /* Number of slabs in a slab cache */
 735         unsigned long long min_slabs = max, max_slabs = 0,
 736                                 avg_slabs, total_slabs = 0;
 737
 738         /* Size of the whole slab */
 739         unsigned long long min_size = max, max_size = 0,
 740                                 avg_size, total_size = 0;
 741
 742         /* Bytes used for object storage in a slab */
 743         unsigned long long min_used = max, max_used = 0,
 744                                 avg_used, total_used = 0;
 745
 746         /* Waste: Bytes used for alignment and padding */
 747         unsigned long long min_waste = max, max_waste = 0,
 748                                 avg_waste, total_waste = 0;
 749         /* Number of objects in a slab */
 750         unsigned long long min_objects = max, max_objects = 0,
 751                                 avg_objects, total_objects = 0;
 752         /* Waste per object */
 753         unsigned long long min_objwaste = max,
 754                                 max_objwaste = 0, avg_objwaste,
 755                                 total_objwaste = 0;
 756
 757         /* Memory per object */
 758         unsigned long long min_memobj = max,
 759                                 max_memobj = 0, avg_memobj,
 760                                 total_objsize = 0;
 761
 762         /* Percentage of partial slabs per slab */
 763         unsigned long min_ppart = 100, max_ppart = 0,
 764                                 avg_ppart, total_ppart = 0;
 765
 766         /* Number of objects in partial slabs */
 767         unsigned long min_partobj = max, max_partobj = 0,
 768                                 avg_partobj, total_partobj = 0;
 769
 770         /* Percentage of partial objects of all objects in a slab */
 771         unsigned long min_ppartobj = 100, max_ppartobj = 0,
 772                                 avg_ppartobj, total_ppartobj = 0;
 773
 774
 775         for (s = slabinfo; s < slabinfo + slabs; s++) {
 776                 unsigned long long size;
 777                 unsigned long used;
 778                 unsigned long long wasted;
 779                 unsigned long long objwaste;
 780                 unsigned long percentage_partial_slabs;
 781                 unsigned long percentage_partial_objs;
 782
 783                 if (!s->slabs || !s->objects)
 784                         continue;
 785
 786                 used_slabs++;
 787
 788                 size = slab_size(s);
 789                 used = s->objects * s->object_size;
 790                 wasted = size - used;
 791                 objwaste = s->slab_size - s->object_size;
 792
 793                 percentage_partial_slabs = s->partial * 100 / s->slabs;
 794                 if (percentage_partial_slabs > 100)
 795                         percentage_partial_slabs = 100;
 796
 797                 percentage_partial_objs = s->objects_partial * 100
 798                                                         / s->objects;
 799
 800                 if (percentage_partial_objs > 100)
 801                         percentage_partial_objs = 100;
 802
 803                 if (s->object_size < min_objsize)
 804                         min_objsize = s->object_size;
 805                 if (s->partial < min_partial)
 806                         min_partial = s->partial;
 807                 if (s->slabs < min_slabs)
 808                         min_slabs = s->slabs;
 809                 if (size < min_size)
 810                         min_size = size;
 811                 if (wasted < min_waste)
 812                         min_waste = wasted;
 813                 if (objwaste < min_objwaste)
 814                         min_objwaste = objwaste;
 815                 if (s->objects < min_objects)
 816                         min_objects = s->objects;
 817                 if (used < min_used)
 818                         min_used = used;
 819                 if (s->objects_partial < min_partobj)
 820                         min_partobj = s->objects_partial;
 821                 if (percentage_partial_slabs < min_ppart)
 822                         min_ppart = percentage_partial_slabs;
 823                 if (percentage_partial_objs < min_ppartobj)
 824                         min_ppartobj = percentage_partial_objs;
 825                 if (s->slab_size < min_memobj)
 826                         min_memobj = s->slab_size;
 827
 828                 if (s->object_size > max_objsize)
 829                         max_objsize = s->object_size;
 830                 if (s->partial > max_partial)
 831                         max_partial = s->partial;
 832                 if (s->slabs > max_slabs)
 833                         max_slabs = s->slabs;
 834                 if (size > max_size)
 835                         max_size = size;
 836                 if (wasted > max_waste)
 837                         max_waste = wasted;
 838                 if (objwaste > max_objwaste)
 839                         max_objwaste = objwaste;
 840                 if (s->objects > max_objects)
 841                         max_objects = s->objects;
 842                 if (used > max_used)
 843                         max_used = used;
 844                 if (s->objects_partial > max_partobj)
 845                         max_partobj = s->objects_partial;
 846                 if (percentage_partial_slabs > max_ppart)
 847                         max_ppart = percentage_partial_slabs;
 848                 if (percentage_partial_objs > max_ppartobj)
 849                         max_ppartobj = percentage_partial_objs;
 850                 if (s->slab_size > max_memobj)
 851                         max_memobj = s->slab_size;
 852
 853                 total_partial += s->partial;
 854                 total_slabs += s->slabs;
 855                 total_size += size;
 856                 total_waste += wasted;
 857
 858                 total_objects += s->objects;
 859                 total_used += used;
 860                 total_partobj += s->objects_partial;
 861                 total_ppart += percentage_partial_slabs;
 862                 total_ppartobj += percentage_partial_objs;
 863
 864                 total_objwaste += s->objects * objwaste;
 865                 total_objsize += s->objects * s->slab_size;
 866         }
 867
 868         if (!total_objects) {
 869                 printf("No objects\n");
 870                 return;
 871         }
 872         if (!used_slabs) {
 873                 printf("No slabs\n");
 874                 return;
 875         }
 876
 877         /* Per slab averages */
 878         avg_partial = total_partial / used_slabs;
 879         avg_slabs = total_slabs / used_slabs;
 880         avg_size = total_size / used_slabs;
 881         avg_waste = total_waste / used_slabs;
 882
 883         avg_objects = total_objects / used_slabs;
 884         avg_used = total_used / used_slabs;
 885         avg_partobj = total_partobj / used_slabs;
 886         avg_ppart = total_ppart / used_slabs;
 887         avg_ppartobj = total_ppartobj / used_slabs;
 888
 889         /* Per object object sizes */
 890         avg_objsize = total_used / total_objects;
 891         avg_objwaste = total_objwaste / total_objects;
 892         avg_partobj = total_partobj * 100 / total_objects;
 893         avg_memobj = total_objsize / total_objects;
 894
 895         printf("Slabcache Totals\n");
 896         printf("----------------\n");
 897         printf("Slabcaches : %3d      Aliases  : %3d->%-3d Active: %3d\n",
 898                         slabs, aliases, alias_targets, used_slabs);
 899
 900         store_size(b1, total_size);store_size(b2, total_waste);
 901         store_size(b3, total_waste * 100 / total_used);
 902         printf("Memory used: %6s   # Loss   : %6s   MRatio:%6s%%\n", b1, b2, b3);
 903
 904         store_size(b1, total_objects);store_size(b2, total_partobj);
 905         store_size(b3, total_partobj * 100 / total_objects);
 906         printf("# Objects  : %6s   # PartObj: %6s   ORatio:%6s%%\n", b1, b2, b3);
 907
 908         printf("\n");
 909         printf("Per Cache    Average         Min         Max       Total\n");
 910         printf("---------------------------------------------------------\n");
 911
 912         store_size(b1, avg_objects);store_size(b2, min_objects);
 913         store_size(b3, max_objects);store_size(b4, total_objects);
 914         printf("#Objects  %10s  %10s  %10s  %10s\n",
 915                         b1,     b2,     b3,     b4);
 916
 917         store_size(b1, avg_slabs);store_size(b2, min_slabs);
 918         store_size(b3, max_slabs);store_size(b4, total_slabs);
 919         printf("#Slabs    %10s  %10s  %10s  %10s\n",
 920                         b1,     b2,     b3,     b4);
 921
 922         store_size(b1, avg_partial);store_size(b2, min_partial);
 923         store_size(b3, max_partial);store_size(b4, total_partial);
 924         printf("#PartSlab %10s  %10s  %10s  %10s\n",
 925                         b1,     b2,     b3,     b4);
 926         store_size(b1, avg_ppart);store_size(b2, min_ppart);
 927         store_size(b3, max_ppart);
 928         store_size(b4, total_partial * 100  / total_slabs);
 929         printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n",
 930                         b1,     b2,     b3,     b4);
 931
 932         store_size(b1, avg_partobj);store_size(b2, min_partobj);
 933         store_size(b3, max_partobj);
 934         store_size(b4, total_partobj);
 935         printf("PartObjs  %10s  %10s  %10s  %10s\n",
 936                         b1,     b2,     b3,     b4);
 937
 938         store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
 939         store_size(b3, max_ppartobj);
 940         store_size(b4, total_partobj * 100 / total_objects);
 941         printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n",
 942                         b1,     b2,     b3,     b4);
 943
 944         store_size(b1, avg_size);store_size(b2, min_size);
 945         store_size(b3, max_size);store_size(b4, total_size);
 946         printf("Memory    %10s  %10s  %10s  %10s\n",
 947                         b1,     b2,     b3,     b4);
 948
 949         store_size(b1, avg_used);store_size(b2, min_used);
 950         store_size(b3, max_used);store_size(b4, total_used);
 951         printf("Used      %10s  %10s  %10s  %10s\n",
 952                         b1,     b2,     b3,     b4);
 953
 954         store_size(b1, avg_waste);store_size(b2, min_waste);
 955         store_size(b3, max_waste);store_size(b4, total_waste);
 956         printf("Loss      %10s  %10s  %10s  %10s\n",
 957                         b1,     b2,     b3,     b4);
 958
 959         printf("\n");
 960         printf("Per Object   Average         Min         Max\n");
 961         printf("---------------------------------------------\n");
 962
 963         store_size(b1, avg_memobj);store_size(b2, min_memobj);
 964         store_size(b3, max_memobj);
 965         printf("Memory    %10s  %10s  %10s\n",
 966                         b1,     b2,     b3);
 967         store_size(b1, avg_objsize);store_size(b2, min_objsize);
 968         store_size(b3, max_objsize);
 969         printf("User      %10s  %10s  %10s\n",
 970                         b1,     b2,     b3);
 971
 972         store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
 973         store_size(b3, max_objwaste);
 974         printf("Loss      %10s  %10s  %10s\n",
 975                         b1,     b2,     b3);
 976 }
 977
 978 void sort_slabs(void)
 979 {
 980         struct slabinfo *s1,*s2;
 981
 982         for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
 983                 for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
 984                         int result;
 985
 986                         if (sort_size)
 987                                 result = slab_size(s1) < slab_size(s2);
 988                         else if (sort_active)
 989                                 result = slab_activity(s1) < slab_activity(s2);
 990                         else
 991                                 result = strcasecmp(s1->name, s2->name);
 992
 993                         if (show_inverted)
 994                                 result = -result;
 995
 996                         if (result > 0) {
 997                                 struct slabinfo t;
 998
 999                                 memcpy(&t, s1, sizeof(struct slabinfo));
1000                                 memcpy(s1, s2, sizeof(struct slabinfo));
1001                                 memcpy(s2, &t, sizeof(struct slabinfo));
1002                         }
1003                 }
1004         }
1005 }
1006
1007 void sort_aliases(void)
1008 {
1009         struct aliasinfo *a1,*a2;
1010
1011         for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
1012                 for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
1013                         char *n1, *n2;
1014
1015                         n1 = a1->name;
1016                         n2 = a2->name;
1017                         if (show_alias && !show_inverted) {
1018                                 n1 = a1->ref;
1019                                 n2 = a2->ref;
1020                         }
1021                         if (strcasecmp(n1, n2) > 0) {
1022                                 struct aliasinfo t;
1023
1024                                 memcpy(&t, a1, sizeof(struct aliasinfo));
1025                                 memcpy(a1, a2, sizeof(struct aliasinfo));
1026                                 memcpy(a2, &t, sizeof(struct aliasinfo));
1027                         }
1028                 }
1029         }
1030 }
1031
1032 void link_slabs(void)
1033 {
1034         struct aliasinfo *a;
1035         struct slabinfo *s;
1036
1037         for (a = aliasinfo; a < aliasinfo + aliases; a++) {
1038
1039                 for (s = slabinfo; s < slabinfo + slabs; s++)
1040                         if (strcmp(a->ref, s->name) == 0) {
1041                                 a->slab = s;
1042                                 s->refs++;
1043                                 break;
1044                         }
1045                 if (s == slabinfo + slabs)
1046                         fatal("Unresolved alias %s\n", a->ref);
1047         }
1048 }
1049
1050 void alias(void)
1051 {
1052         struct aliasinfo *a;
1053         char *active = NULL;
1054
1055         sort_aliases();
1056         link_slabs();
1057
1058         for(a = aliasinfo; a < aliasinfo + aliases; a++) {
1059
1060                 if (!show_single_ref && a->slab->refs == 1)
1061                         continue;
1062
1063                 if (!show_inverted) {
1064                         if (active) {
1065                                 if (strcmp(a->slab->name, active) == 0) {
1066                                         printf(" %s", a->name);
1067                                         continue;
1068                                 }
1069                         }
1070                         printf("\n%-12s <- %s", a->slab->name, a->name);
1071                         active = a->slab->name;
1072                 }
1073                 else
1074                         printf("%-20s -> %s\n", a->name, a->slab->name);
1075         }
1076         if (active)
1077                 printf("\n");
1078 }
1079
1080
1081 void rename_slabs(void)
1082 {
1083         struct slabinfo *s;
1084         struct aliasinfo *a;
1085
1086         for (s = slabinfo; s < slabinfo + slabs; s++) {
1087                 if (*s->name != ':')
1088                         continue;
1089
1090                 if (s->refs > 1 && !show_first_alias)
1091                         continue;
1092
1093                 a = find_one_alias(s);
1094
1095                 if (a)
1096                         s->name = a->name;
1097                 else {
1098                         s->name = "*";
1099                         actual_slabs--;
1100                 }
1101         }
1102 }
1103
1104 int slab_mismatch(char *slab)
1105 {
1106         return regexec(&pattern, slab, 0, NULL, 0);
1107 }
1108
1109 void read_slab_dir(void)
1110 {
1111         DIR *dir;
1112         struct dirent *de;
1113         struct slabinfo *slab = slabinfo;
1114         struct aliasinfo *alias = aliasinfo;
1115         char *p;
1116         char *t;
1117         int count;
1118
1119         if (chdir("/sys/kernel/slab") && chdir("/sys/slab"))
1120                 fatal("SYSFS support for SLUB not active\n");
1121
1122         dir = opendir(".");
1123         while ((de = readdir(dir))) {
1124                 if (de->d_name[0] == '.' ||
1125                         (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1126                                 continue;
1127                 switch (de->d_type) {
1128                    case DT_LNK:
1129                         alias->name = strdup(de->d_name);
1130                         count = readlink(de->d_name, buffer, sizeof(buffer));
1131
1132                         if (count < 0)
1133                                 fatal("Cannot read symlink %s\n", de->d_name);
1134
1135                         buffer[count] = 0;
1136                         p = buffer + count;
1137                         while (p > buffer && p[-1] != '/')
1138                                 p--;
1139                         alias->ref = strdup(p);
1140                         alias++;
1141                         break;
1142                    case DT_DIR:
1143                         if (chdir(de->d_name))
1144                                 fatal("Unable to access slab %s\n", slab->name);
1145                         slab->name = strdup(de->d_name);
1146                         slab->alias = 0;
1147                         slab->refs = 0;
1148                         slab->aliases = get_obj("aliases");
1149                         slab->align = get_obj("align");
1150                         slab->cache_dma = get_obj("cache_dma");
1151                         slab->cpu_slabs = get_obj("cpu_slabs");
1152                         slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1153                         slab->hwcache_align = get_obj("hwcache_align");
1154                         slab->object_size = get_obj("object_size");
1155                         slab->objects = get_obj("objects");
1156                         slab->objects_partial = get_obj("objects_partial");
1157                         slab->objects_total = get_obj("objects_total");
1158                         slab->objs_per_slab = get_obj("objs_per_slab");
1159                         slab->order = get_obj("order");
1160                         slab->partial = get_obj("partial");
1161                         slab->partial = get_obj_and_str("partial", &t);
1162                         decode_numa_list(slab->numa_partial, t);
1163                         free(t);
1164                         slab->poison = get_obj("poison");
1165                         slab->reclaim_account = get_obj("reclaim_account");
1166                         slab->red_zone = get_obj("red_zone");
1167                         slab->sanity_checks = get_obj("sanity_checks");
1168                         slab->slab_size = get_obj("slab_size");
1169                         slab->slabs = get_obj_and_str("slabs", &t);
1170                         decode_numa_list(slab->numa, t);
1171                         free(t);
1172                         slab->store_user = get_obj("store_user");
1173                         slab->trace = get_obj("trace");
1174                         slab->alloc_fastpath = get_obj("alloc_fastpath");
1175                         slab->alloc_slowpath = get_obj("alloc_slowpath");
1176                         slab->free_fastpath = get_obj("free_fastpath");
1177                         slab->free_slowpath = get_obj("free_slowpath");
1178                         slab->free_frozen= get_obj("free_frozen");
1179                         slab->free_add_partial = get_obj("free_add_partial");
1180                         slab->free_remove_partial = get_obj("free_remove_partial");
1181                         slab->alloc_from_partial = get_obj("alloc_from_partial");
1182                         slab->alloc_slab = get_obj("alloc_slab");
1183                         slab->alloc_refill = get_obj("alloc_refill");
1184                         slab->free_slab = get_obj("free_slab");
1185                         slab->cpuslab_flush = get_obj("cpuslab_flush");
1186                         slab->deactivate_full = get_obj("deactivate_full");
1187                         slab->deactivate_empty = get_obj("deactivate_empty");
1188                         slab->deactivate_to_head = get_obj("deactivate_to_head");
1189                         slab->deactivate_to_tail = get_obj("deactivate_to_tail");
1190                         slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
1191                         chdir("..");
1192                         if (slab->name[0] == ':')
1193                                 alias_targets++;
1194                         slab++;
1195                         break;
1196                    default :
1197                         fatal("Unknown file type %lx\n", de->d_type);
1198                 }
1199         }
1200         closedir(dir);
1201         slabs = slab - slabinfo;
1202         actual_slabs = slabs;
1203         aliases = alias - aliasinfo;
1204         if (slabs > MAX_SLABS)
1205                 fatal("Too many slabs\n");
1206         if (aliases > MAX_ALIASES)
1207                 fatal("Too many aliases\n");
1208 }
1209
1210 void output_slabs(void)
1211 {
1212         struct slabinfo *slab;
1213
1214         for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
1215
1216                 if (slab->alias)
1217                         continue;
1218
1219
1220                 if (show_numa)
1221                         slab_numa(slab, 0);
1222                 else if (show_track)
1223                         show_tracking(slab);
1224                 else if (validate)
1225                         slab_validate(slab);
1226                 else if (shrink)
1227                         slab_shrink(slab);
1228                 else if (set_debug)
1229                         slab_debug(slab);
1230                 else if (show_ops)
1231                         ops(slab);
1232                 else if (show_slab)
1233                         slabcache(slab);
1234                 else if (show_report)
1235                         report(slab);
1236         }
1237 }
1238
1239 struct option opts[] = {
1240         { "aliases", 0, NULL, 'a' },
1241         { "activity", 0, NULL, 'A' },
1242         { "debug", 2, NULL, 'd' },
1243         { "display-activity", 0, NULL, 'D' },
1244         { "empty", 0, NULL, 'e' },
1245         { "first-alias", 0, NULL, 'f' },
1246         { "help", 0, NULL, 'h' },
1247         { "inverted", 0, NULL, 'i'},
1248         { "numa", 0, NULL, 'n' },
1249         { "ops", 0, NULL, 'o' },
1250         { "report", 0, NULL, 'r' },
1251         { "shrink", 0, NULL, 's' },
1252         { "slabs", 0, NULL, 'l' },
1253         { "track", 0, NULL, 't'},
1254         { "validate", 0, NULL, 'v' },
1255         { "zero", 0, NULL, 'z' },
1256         { "1ref", 0, NULL, '1'},
1257         { NULL, 0, NULL, 0 }
1258 };
1259
1260 int main(int argc, char *argv[])
1261 {
1262         int c;
1263         int err;
1264         char *pattern_source;
1265
1266         page_size = getpagesize();
1267
1268         while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
1269                                                 opts, NULL)) != -1)
1270                 switch (c) {
1271                 case '1':
1272                         show_single_ref = 1;
1273                         break;
1274                 case 'a':
1275                         show_alias = 1;
1276                         break;
1277                 case 'A':
1278                         sort_active = 1;
1279                         break;
1280                 case 'd':
1281                         set_debug = 1;
1282                         if (!debug_opt_scan(optarg))
1283                                 fatal("Invalid debug option '%s'\n", optarg);
1284                         break;
1285                 case 'D':
1286                         show_activity = 1;
1287                         break;
1288                 case 'e':
1289                         show_empty = 1;
1290                         break;
1291                 case 'f':
1292                         show_first_alias = 1;
1293                         break;
1294                 case 'h':
1295                         usage();
1296                         return 0;
1297                 case 'i':
1298                         show_inverted = 1;
1299                         break;
1300                 case 'n':
1301                         show_numa = 1;
1302                         break;
1303                 case 'o':
1304                         show_ops = 1;
1305                         break;
1306                 case 'r':
1307                         show_report = 1;
1308                         break;
1309                 case 's':
1310                         shrink = 1;
1311                         break;
1312                 case 'l':
1313                         show_slab = 1;
1314                         break;
1315                 case 't':
1316                         show_track = 1;
1317                         break;
1318                 case 'v':
1319                         validate = 1;
1320                         break;
1321                 case 'z':
1322                         skip_zero = 0;
1323                         break;
1324                 case 'T':
1325                         show_totals = 1;
1326                         break;
1327                 case 'S':
1328                         sort_size = 1;
1329                         break;
1330
1331                 default:
1332                         fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1333
1334         }
1335
1336         if (!show_slab && !show_alias && !show_track && !show_report
1337                 && !validate && !shrink && !set_debug && !show_ops)
1338                         show_slab = 1;
1339
1340         if (argc > optind)
1341                 pattern_source = argv[optind];
1342         else
1343                 pattern_source = ".*";
1344
1345         err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1346         if (err)
1347                 fatal("%s: Invalid pattern '%s' code %d\n",
1348                         argv[0], pattern_source, err);
1349         read_slab_dir();
1350         if (show_alias)
1351                 alias();
1352         else
1353         if (show_totals)
1354                 totals();
1355         else {
1356                 link_slabs();
1357                 rename_slabs();
1358                 sort_slabs();
1359                 output_slabs();
1360         }
1361         return 0;
1362 }