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 <string.h>
  15 #include <unistd.h>
  16 #include <stdarg.h>
  17 #include <getopt.h>
  18 #include <regex.h>
  19
  20 #define MAX_SLABS 500
  21 #define MAX_ALIASES 500
  22 #define MAX_NODES 1024
  23
  24 struct slabinfo {
  25         char *name;
  26         int alias;
  27         int refs;
  28         int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
  29         int hwcache_align, object_size, objs_per_slab;
  30         int sanity_checks, slab_size, store_user, trace;
  31         int order, poison, reclaim_account, red_zone;
  32         unsigned long partial, objects, slabs;
  33         int numa[MAX_NODES];
  34         int numa_partial[MAX_NODES];
  35 } slabinfo[MAX_SLABS];
  36
  37 struct aliasinfo {
  38         char *name;
  39         char *ref;
  40         struct slabinfo *slab;
  41 } aliasinfo[MAX_ALIASES];
  42
  43 int slabs = 0;
  44 int aliases = 0;
  45 int alias_targets = 0;
  46 int highest_node = 0;
  47
  48 char buffer[4096];
  49
  50 int show_alias = 0;
  51 int show_slab = 0;
  52 int skip_zero = 1;
  53 int show_numa = 0;
  54 int show_track = 0;
  55 int show_first_alias = 0;
  56 int validate = 0;
  57 int shrink = 0;
  58 int show_inverted = 0;
  59 int show_single_ref = 0;
  60 int show_totals = 0;
  61 int sort_size = 0;
  62
  63 int page_size;
  64
  65 regex_t pattern;
  66
  67 void fatal(const char *x, ...)
  68 {
  69         va_list ap;
  70
  71         va_start(ap, x);
  72         vfprintf(stderr, x, ap);
  73         va_end(ap);
  74         exit(1);
  75 }
  76
  77 void usage(void)
  78 {
  79         printf("slabinfo [-ahnpvtsz] [slab-regexp]\n"
  80                 "-a|--aliases           Show aliases\n"
  81                 "-h|--help              Show usage information\n"
  82                 "-n|--numa              Show NUMA information\n"
  83                 "-s|--shrink            Shrink slabs\n"
  84                 "-v|--validate          Validate slabs\n"
  85                 "-t|--tracking          Show alloc/free information\n"
  86                 "-T|--Totals            Show summary information\n"
  87                 "-l|--slabs             Show slabs\n"
  88                 "-S|--Size              Sort by size\n"
  89                 "-z|--zero              Include empty slabs\n"
  90                 "-f|--first-alias       Show first alias\n"
  91                 "-i|--inverted          Inverted list\n"
  92                 "-1|--1ref              Single reference\n"
  93         );
  94 }
  95
  96 unsigned long read_obj(char *name)
  97 {
  98         FILE *f = fopen(name, "r");
  99
 100         if (!f)
 101                 buffer[0] = 0;
 102         else {
 103                 if (!fgets(buffer,sizeof(buffer), f))
 104                         buffer[0] = 0;
 105                 fclose(f);
 106                 if (buffer[strlen(buffer)] == '\n')
 107                         buffer[strlen(buffer)] = 0;
 108         }
 109         return strlen(buffer);
 110 }
 111
 112
 113 /*
 114  * Get the contents of an attribute
 115  */
 116 unsigned long get_obj(char *name)
 117 {
 118         if (!read_obj(name))
 119                 return 0;
 120
 121         return atol(buffer);
 122 }
 123
 124 unsigned long get_obj_and_str(char *name, char **x)
 125 {
 126         unsigned long result = 0;
 127         char *p;
 128
 129         *x = NULL;
 130
 131         if (!read_obj(name)) {
 132                 x = NULL;
 133                 return 0;
 134         }
 135         result = strtoul(buffer, &p, 10);
 136         while (*p == ' ')
 137                 p++;
 138         if (*p)
 139                 *x = strdup(p);
 140         return result;
 141 }
 142
 143 void set_obj(struct slabinfo *s, char *name, int n)
 144 {
 145         char x[100];
 146
 147         sprintf(x, "%s/%s", s->name, name);
 148
 149         FILE *f = fopen(x, "w");
 150
 151         if (!f)
 152                 fatal("Cannot write to %s\n", x);
 153
 154         fprintf(f, "%d\n", n);
 155         fclose(f);
 156 }
 157
 158 /*
 159  * Put a size string together
 160  */
 161 int store_size(char *buffer, unsigned long value)
 162 {
 163         unsigned long divisor = 1;
 164         char trailer = 0;
 165         int n;
 166
 167         if (value > 1000000000UL) {
 168                 divisor = 100000000UL;
 169                 trailer = 'G';
 170         } else if (value > 1000000UL) {
 171                 divisor = 100000UL;
 172                 trailer = 'M';
 173         } else if (value > 1000UL) {
 174                 divisor = 100;
 175                 trailer = 'K';
 176         }
 177
 178         value /= divisor;
 179         n = sprintf(buffer, "%ld",value);
 180         if (trailer) {
 181                 buffer[n] = trailer;
 182                 n++;
 183                 buffer[n] = 0;
 184         }
 185         if (divisor != 1) {
 186                 memmove(buffer + n - 2, buffer + n - 3, 4);
 187                 buffer[n-2] = '.';
 188                 n++;
 189         }
 190         return n;
 191 }
 192
 193 void decode_numa_list(int *numa, char *t)
 194 {
 195         int node;
 196         int nr;
 197
 198         memset(numa, 0, MAX_NODES * sizeof(int));
 199
 200         while (*t == 'N') {
 201                 t++;
 202                 node = strtoul(t, &t, 10);
 203                 if (*t == '=') {
 204                         t++;
 205                         nr = strtoul(t, &t, 10);
 206                         numa[node] = nr;
 207                         if (node > highest_node)
 208                                 highest_node = node;
 209                 }
 210                 while (*t == ' ')
 211                         t++;
 212         }
 213 }
 214
 215 void slab_validate(struct slabinfo *s)
 216 {
 217         set_obj(s, "validate", 1);
 218 }
 219
 220 void slab_shrink(struct slabinfo *s)
 221 {
 222         set_obj(s, "shrink", 1);
 223 }
 224
 225 int line = 0;
 226
 227 void first_line(void)
 228 {
 229         printf("Name                 Objects   Objsize    Space "
 230                 "Slabs/Part/Cpu  O/S O %%Fr %%Ef Flg\n");
 231 }
 232
 233 /*
 234  * Find the shortest alias of a slab
 235  */
 236 struct aliasinfo *find_one_alias(struct slabinfo *find)
 237 {
 238         struct aliasinfo *a;
 239         struct aliasinfo *best = NULL;
 240
 241         for(a = aliasinfo;a < aliasinfo + aliases; a++) {
 242                 if (a->slab == find &&
 243                         (!best || strlen(best->name) < strlen(a->name))) {
 244                                 best = a;
 245                                 if (strncmp(a->name,"kmall", 5) == 0)
 246                                         return best;
 247                         }
 248         }
 249         if (best)
 250                 return best;
 251         fatal("Cannot find alias for %s\n", find->name);
 252         return NULL;
 253 }
 254
 255 unsigned long slab_size(struct slabinfo *s)
 256 {
 257         return  s->slabs * (page_size << s->order);
 258 }
 259
 260
 261 void slabcache(struct slabinfo *s)
 262 {
 263         char size_str[20];
 264         char dist_str[40];
 265         char flags[20];
 266         char *p = flags;
 267
 268         if (skip_zero && !s->slabs)
 269                 return;
 270
 271         store_size(size_str, slab_size(s));
 272         sprintf(dist_str,"%lu/%lu/%d", s->slabs, s->partial, s->cpu_slabs);
 273
 274         if (!line++)
 275                 first_line();
 276
 277         if (s->aliases)
 278                 *p++ = '*';
 279         if (s->cache_dma)
 280                 *p++ = 'd';
 281         if (s->hwcache_align)
 282                 *p++ = 'A';
 283         if (s->poison)
 284                 *p++ = 'P';
 285         if (s->reclaim_account)
 286                 *p++ = 'a';
 287         if (s->red_zone)
 288                 *p++ = 'Z';
 289         if (s->sanity_checks)
 290                 *p++ = 'F';
 291         if (s->store_user)
 292                 *p++ = 'U';
 293         if (s->trace)
 294                 *p++ = 'T';
 295
 296         *p = 0;
 297         printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
 298                 s->name, s->objects, s->object_size, size_str, dist_str,
 299                 s->objs_per_slab, s->order,
 300                 s->slabs ? (s->partial * 100) / s->slabs : 100,
 301                 s->slabs ? (s->objects * s->object_size * 100) /
 302                         (s->slabs * (page_size << s->order)) : 100,
 303                 flags);
 304 }
 305
 306 void slab_numa(struct slabinfo *s)
 307 {
 308         int node;
 309
 310         if (!highest_node)
 311                 fatal("No NUMA information available.\n");
 312
 313         if (skip_zero && !s->slabs)
 314                 return;
 315
 316         if (!line) {
 317                 printf("\nSlab             Node ");
 318                 for(node = 0; node <= highest_node; node++)
 319                         printf(" %4d", node);
 320                 printf("\n----------------------");
 321                 for(node = 0; node <= highest_node; node++)
 322                         printf("-----");
 323                 printf("\n");
 324         }
 325         printf("%-21s ", s->name);
 326         for(node = 0; node <= highest_node; node++) {
 327                 char b[20];
 328
 329                 store_size(b, s->numa[node]);
 330                 printf(" %4s", b);
 331         }
 332         printf("\n");
 333         line++;
 334 }
 335
 336 void show_tracking(struct slabinfo *s)
 337 {
 338         printf("\n%s: Calls to allocate a slab object\n", s->name);
 339         printf("---------------------------------------------------\n");
 340         if (read_obj("alloc_calls"))
 341                 printf(buffer);
 342
 343         printf("%s: Calls to free a slab object\n", s->name);
 344         printf("-----------------------------------------------\n");
 345         if (read_obj("free_calls"))
 346                 printf(buffer);
 347
 348 }
 349
 350 void totals(void)
 351 {
 352         struct slabinfo *s;
 353
 354         int used_slabs = 0;
 355         char b1[20], b2[20], b3[20], b4[20];
 356         unsigned long long max = 1ULL << 63;
 357
 358         /* Object size */
 359         unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
 360
 361         /* Number of partial slabs in a slabcache */
 362         unsigned long long min_partial = max, max_partial = 0,
 363                                 avg_partial, total_partial = 0;
 364
 365         /* Number of slabs in a slab cache */
 366         unsigned long long min_slabs = max, max_slabs = 0,
 367                                 avg_slabs, total_slabs = 0;
 368
 369         /* Size of the whole slab */
 370         unsigned long long min_size = max, max_size = 0,
 371                                 avg_size, total_size = 0;
 372
 373         /* Bytes used for object storage in a slab */
 374         unsigned long long min_used = max, max_used = 0,
 375                                 avg_used, total_used = 0;
 376
 377         /* Waste: Bytes used for alignment and padding */
 378         unsigned long long min_waste = max, max_waste = 0,
 379                                 avg_waste, total_waste = 0;
 380         /* Number of objects in a slab */
 381         unsigned long long min_objects = max, max_objects = 0,
 382                                 avg_objects, total_objects = 0;
 383         /* Waste per object */
 384         unsigned long long min_objwaste = max,
 385                                 max_objwaste = 0, avg_objwaste,
 386                                 total_objwaste = 0;
 387
 388         /* Memory per object */
 389         unsigned long long min_memobj = max,
 390                                 max_memobj = 0, avg_memobj,
 391                                 total_objsize = 0;
 392
 393         /* Percentage of partial slabs per slab */
 394         unsigned long min_ppart = 100, max_ppart = 0,
 395                                 avg_ppart, total_ppart = 0;
 396
 397         /* Number of objects in partial slabs */
 398         unsigned long min_partobj = max, max_partobj = 0,
 399                                 avg_partobj, total_partobj = 0;
 400
 401         /* Percentage of partial objects of all objects in a slab */
 402         unsigned long min_ppartobj = 100, max_ppartobj = 0,
 403                                 avg_ppartobj, total_ppartobj = 0;
 404
 405
 406         for (s = slabinfo; s < slabinfo + slabs; s++) {
 407                 unsigned long long size;
 408                 unsigned long used;
 409                 unsigned long long wasted;
 410                 unsigned long long objwaste;
 411                 long long objects_in_partial_slabs;
 412                 unsigned long percentage_partial_slabs;
 413                 unsigned long percentage_partial_objs;
 414
 415                 if (!s->slabs || !s->objects)
 416                         continue;
 417
 418                 used_slabs++;
 419
 420                 size = slab_size(s);
 421                 used = s->objects * s->object_size;
 422                 wasted = size - used;
 423                 objwaste = s->slab_size - s->object_size;
 424
 425                 objects_in_partial_slabs = s->objects -
 426                         (s->slabs - s->partial - s ->cpu_slabs) *
 427                         s->objs_per_slab;
 428
 429                 if (objects_in_partial_slabs < 0)
 430                         objects_in_partial_slabs = 0;
 431
 432                 percentage_partial_slabs = s->partial * 100 / s->slabs;
 433                 if (percentage_partial_slabs > 100)
 434                         percentage_partial_slabs = 100;
 435
 436                 percentage_partial_objs = objects_in_partial_slabs * 100
 437                                                         / s->objects;
 438
 439                 if (percentage_partial_objs > 100)
 440                         percentage_partial_objs = 100;
 441
 442                 if (s->object_size < min_objsize)
 443                         min_objsize = s->object_size;
 444                 if (s->partial < min_partial)
 445                         min_partial = s->partial;
 446                 if (s->slabs < min_slabs)
 447                         min_slabs = s->slabs;
 448                 if (size < min_size)
 449                         min_size = size;
 450                 if (wasted < min_waste)
 451                         min_waste = wasted;
 452                 if (objwaste < min_objwaste)
 453                         min_objwaste = objwaste;
 454                 if (s->objects < min_objects)
 455                         min_objects = s->objects;
 456                 if (used < min_used)
 457                         min_used = used;
 458                 if (objects_in_partial_slabs < min_partobj)
 459                         min_partobj = objects_in_partial_slabs;
 460                 if (percentage_partial_slabs < min_ppart)
 461                         min_ppart = percentage_partial_slabs;
 462                 if (percentage_partial_objs < min_ppartobj)
 463                         min_ppartobj = percentage_partial_objs;
 464                 if (s->slab_size < min_memobj)
 465                         min_memobj = s->slab_size;
 466
 467                 if (s->object_size > max_objsize)
 468                         max_objsize = s->object_size;
 469                 if (s->partial > max_partial)
 470                         max_partial = s->partial;
 471                 if (s->slabs > max_slabs)
 472                         max_slabs = s->slabs;
 473                 if (size > max_size)
 474                         max_size = size;
 475                 if (wasted > max_waste)
 476                         max_waste = wasted;
 477                 if (objwaste > max_objwaste)
 478                         max_objwaste = objwaste;
 479                 if (s->objects > max_objects)
 480                         max_objects = s->objects;
 481                 if (used > max_used)
 482                         max_used = used;
 483                 if (objects_in_partial_slabs > max_partobj)
 484                         max_partobj = objects_in_partial_slabs;
 485                 if (percentage_partial_slabs > max_ppart)
 486                         max_ppart = percentage_partial_slabs;
 487                 if (percentage_partial_objs > max_ppartobj)
 488                         max_ppartobj = percentage_partial_objs;
 489                 if (s->slab_size > max_memobj)
 490                         max_memobj = s->slab_size;
 491
 492                 total_partial += s->partial;
 493                 total_slabs += s->slabs;
 494                 total_size += size;
 495                 total_waste += wasted;
 496
 497                 total_objects += s->objects;
 498                 total_used += used;
 499                 total_partobj += objects_in_partial_slabs;
 500                 total_ppart += percentage_partial_slabs;
 501                 total_ppartobj += percentage_partial_objs;
 502
 503                 total_objwaste += s->objects * objwaste;
 504                 total_objsize += s->objects * s->slab_size;
 505         }
 506
 507         if (!total_objects) {
 508                 printf("No objects\n");
 509                 return;
 510         }
 511         if (!used_slabs) {
 512                 printf("No slabs\n");
 513                 return;
 514         }
 515
 516         /* Per slab averages */
 517         avg_partial = total_partial / used_slabs;
 518         avg_slabs = total_slabs / used_slabs;
 519         avg_size = total_size / used_slabs;
 520         avg_waste = total_waste / used_slabs;
 521
 522         avg_objects = total_objects / used_slabs;
 523         avg_used = total_used / used_slabs;
 524         avg_partobj = total_partobj / used_slabs;
 525         avg_ppart = total_ppart / used_slabs;
 526         avg_ppartobj = total_ppartobj / used_slabs;
 527
 528         /* Per object object sizes */
 529         avg_objsize = total_used / total_objects;
 530         avg_objwaste = total_objwaste / total_objects;
 531         avg_partobj = total_partobj * 100 / total_objects;
 532         avg_memobj = total_objsize / total_objects;
 533
 534         printf("Slabcache Totals\n");
 535         printf("----------------\n");
 536         printf("Slabcaches : %3d      Aliases  : %3d->%-3d Active: %3d\n",
 537                         slabs, aliases, alias_targets, used_slabs);
 538
 539         store_size(b1, total_size);store_size(b2, total_waste);
 540         store_size(b3, total_waste * 100 / total_used);
 541         printf("Memory used: %6s   # Loss   : %6s   MRatio: %6s%%\n", b1, b2, b3);
 542
 543         store_size(b1, total_objects);store_size(b2, total_partobj);
 544         store_size(b3, total_partobj * 100 / total_objects);
 545         printf("# Objects  : %6s   # PartObj: %6s   ORatio: %6s%%\n", b1, b2, b3);
 546
 547         printf("\n");
 548         printf("Per Cache    Average         Min         Max       Total\n");
 549         printf("---------------------------------------------------------\n");
 550
 551         store_size(b1, avg_objects);store_size(b2, min_objects);
 552         store_size(b3, max_objects);store_size(b4, total_objects);
 553         printf("#Objects  %10s  %10s  %10s  %10s\n",
 554                         b1,     b2,     b3,     b4);
 555
 556         store_size(b1, avg_slabs);store_size(b2, min_slabs);
 557         store_size(b3, max_slabs);store_size(b4, total_slabs);
 558         printf("#Slabs    %10s  %10s  %10s  %10s\n",
 559                         b1,     b2,     b3,     b4);
 560
 561         store_size(b1, avg_partial);store_size(b2, min_partial);
 562         store_size(b3, max_partial);store_size(b4, total_partial);
 563         printf("#PartSlab %10s  %10s  %10s  %10s\n",
 564                         b1,     b2,     b3,     b4);
 565         store_size(b1, avg_ppart);store_size(b2, min_ppart);
 566         store_size(b3, max_ppart);
 567         store_size(b4, total_partial * 100  / total_slabs);
 568         printf("%%PartSlab %10s%% %10s%% %10s%% %10s%%\n",
 569                         b1,     b2,     b3,     b4);
 570
 571         store_size(b1, avg_partobj);store_size(b2, min_partobj);
 572         store_size(b3, max_partobj);
 573         store_size(b4, total_partobj);
 574         printf("PartObjs  %10s  %10s  %10s  %10s\n",
 575                         b1,     b2,     b3,     b4);
 576
 577         store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
 578         store_size(b3, max_ppartobj);
 579         store_size(b4, total_partobj * 100 / total_objects);
 580         printf("%% PartObj %10s%% %10s%% %10s%% %10s%%\n",
 581                         b1,     b2,     b3,     b4);
 582
 583         store_size(b1, avg_size);store_size(b2, min_size);
 584         store_size(b3, max_size);store_size(b4, total_size);
 585         printf("Memory    %10s  %10s  %10s  %10s\n",
 586                         b1,     b2,     b3,     b4);
 587
 588         store_size(b1, avg_used);store_size(b2, min_used);
 589         store_size(b3, max_used);store_size(b4, total_used);
 590         printf("Used      %10s  %10s  %10s  %10s\n",
 591                         b1,     b2,     b3,     b4);
 592
 593         store_size(b1, avg_waste);store_size(b2, min_waste);
 594         store_size(b3, max_waste);store_size(b4, total_waste);
 595         printf("Loss      %10s  %10s  %10s  %10s\n",
 596                         b1,     b2,     b3,     b4);
 597
 598         printf("\n");
 599         printf("Per Object   Average         Min         Max\n");
 600         printf("---------------------------------------------\n");
 601
 602         store_size(b1, avg_memobj);store_size(b2, min_memobj);
 603         store_size(b3, max_memobj);
 604         printf("Memory    %10s  %10s  %10s\n",
 605                         b1,     b2,     b3);
 606         store_size(b1, avg_objsize);store_size(b2, min_objsize);
 607         store_size(b3, max_objsize);
 608         printf("User      %10s  %10s  %10s\n",
 609                         b1,     b2,     b3);
 610
 611         store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
 612         store_size(b3, max_objwaste);
 613         printf("Loss      %10s  %10s  %10s\n",
 614                         b1,     b2,     b3);
 615 }
 616
 617 void sort_slabs(void)
 618 {
 619         struct slabinfo *s1,*s2;
 620
 621         for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
 622                 for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
 623                         int result;
 624
 625                         if (sort_size)
 626                                 result = slab_size(s1) < slab_size(s2);
 627                         else
 628                                 result = strcasecmp(s1->name, s2->name);
 629
 630                         if (show_inverted)
 631                                 result = -result;
 632
 633                         if (result > 0) {
 634                                 struct slabinfo t;
 635
 636                                 memcpy(&t, s1, sizeof(struct slabinfo));
 637                                 memcpy(s1, s2, sizeof(struct slabinfo));
 638                                 memcpy(s2, &t, sizeof(struct slabinfo));
 639                         }
 640                 }
 641         }
 642 }
 643
 644 void sort_aliases(void)
 645 {
 646         struct aliasinfo *a1,*a2;
 647
 648         for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
 649                 for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
 650                         char *n1, *n2;
 651
 652                         n1 = a1->name;
 653                         n2 = a2->name;
 654                         if (show_alias && !show_inverted) {
 655                                 n1 = a1->ref;
 656                                 n2 = a2->ref;
 657                         }
 658                         if (strcasecmp(n1, n2) > 0) {
 659                                 struct aliasinfo t;
 660
 661                                 memcpy(&t, a1, sizeof(struct aliasinfo));
 662                                 memcpy(a1, a2, sizeof(struct aliasinfo));
 663                                 memcpy(a2, &t, sizeof(struct aliasinfo));
 664                         }
 665                 }
 666         }
 667 }
 668
 669 void link_slabs(void)
 670 {
 671         struct aliasinfo *a;
 672         struct slabinfo *s;
 673
 674         for (a = aliasinfo; a < aliasinfo + aliases; a++) {
 675
 676                 for(s = slabinfo; s < slabinfo + slabs; s++)
 677                         if (strcmp(a->ref, s->name) == 0) {
 678                                 a->slab = s;
 679                                 s->refs++;
 680                                 break;
 681                         }
 682                 if (s == slabinfo + slabs)
 683                         fatal("Unresolved alias %s\n", a->ref);
 684         }
 685 }
 686
 687 void alias(void)
 688 {
 689         struct aliasinfo *a;
 690         char *active = NULL;
 691
 692         sort_aliases();
 693         link_slabs();
 694
 695         for(a = aliasinfo; a < aliasinfo + aliases; a++) {
 696
 697                 if (!show_single_ref && a->slab->refs == 1)
 698                         continue;
 699
 700                 if (!show_inverted) {
 701                         if (active) {
 702                                 if (strcmp(a->slab->name, active) == 0) {
 703                                         printf(" %s", a->name);
 704                                         continue;
 705                                 }
 706                         }
 707                         printf("\n%-20s <- %s", a->slab->name, a->name);
 708                         active = a->slab->name;
 709                 }
 710                 else
 711                         printf("%-20s -> %s\n", a->name, a->slab->name);
 712         }
 713         if (active)
 714                 printf("\n");
 715 }
 716
 717
 718 void rename_slabs(void)
 719 {
 720         struct slabinfo *s;
 721         struct aliasinfo *a;
 722
 723         for (s = slabinfo; s < slabinfo + slabs; s++) {
 724                 if (*s->name != ':')
 725                         continue;
 726
 727                 if (s->refs > 1 && !show_first_alias)
 728                         continue;
 729
 730                 a = find_one_alias(s);
 731
 732                 s->name = a->name;
 733         }
 734 }
 735
 736 int slab_mismatch(char *slab)
 737 {
 738         return regexec(&pattern, slab, 0, NULL, 0);
 739 }
 740
 741 void read_slab_dir(void)
 742 {
 743         DIR *dir;
 744         struct dirent *de;
 745         struct slabinfo *slab = slabinfo;
 746         struct aliasinfo *alias = aliasinfo;
 747         char *p;
 748         char *t;
 749         int count;
 750
 751         dir = opendir(".");
 752         while ((de = readdir(dir))) {
 753                 if (de->d_name[0] == '.' ||
 754                                 slab_mismatch(de->d_name))
 755                         continue;
 756                 switch (de->d_type) {
 757                    case DT_LNK:
 758                         alias->name = strdup(de->d_name);
 759                         count = readlink(de->d_name, buffer, sizeof(buffer));
 760
 761                         if (count < 0)
 762                                 fatal("Cannot read symlink %s\n", de->d_name);
 763
 764                         buffer[count] = 0;
 765                         p = buffer + count;
 766                         while (p > buffer && p[-1] != '/')
 767                                 p--;
 768                         alias->ref = strdup(p);
 769                         alias++;
 770                         break;
 771                    case DT_DIR:
 772                         if (chdir(de->d_name))
 773                                 fatal("Unable to access slab %s\n", slab->name);
 774                         slab->name = strdup(de->d_name);
 775                         slab->alias = 0;
 776                         slab->refs = 0;
 777                         slab->aliases = get_obj("aliases");
 778                         slab->align = get_obj("align");
 779                         slab->cache_dma = get_obj("cache_dma");
 780                         slab->cpu_slabs = get_obj("cpu_slabs");
 781                         slab->destroy_by_rcu = get_obj("destroy_by_rcu");
 782                         slab->hwcache_align = get_obj("hwcache_align");
 783                         slab->object_size = get_obj("object_size");
 784                         slab->objects = get_obj("objects");
 785                         slab->objs_per_slab = get_obj("objs_per_slab");
 786                         slab->order = get_obj("order");
 787                         slab->partial = get_obj("partial");
 788                         slab->partial = get_obj_and_str("partial", &t);
 789                         decode_numa_list(slab->numa_partial, t);
 790                         slab->poison = get_obj("poison");
 791                         slab->reclaim_account = get_obj("reclaim_account");
 792                         slab->red_zone = get_obj("red_zone");
 793                         slab->sanity_checks = get_obj("sanity_checks");
 794                         slab->slab_size = get_obj("slab_size");
 795                         slab->slabs = get_obj_and_str("slabs", &t);
 796                         decode_numa_list(slab->numa, t);
 797                         slab->store_user = get_obj("store_user");
 798                         slab->trace = get_obj("trace");
 799                         chdir("..");
 800                         if (slab->name[0] == ':')
 801                                 alias_targets++;
 802                         slab++;
 803                         break;
 804                    default :
 805                         fatal("Unknown file type %lx\n", de->d_type);
 806                 }
 807         }
 808         closedir(dir);
 809         slabs = slab - slabinfo;
 810         aliases = alias - aliasinfo;
 811         if (slabs > MAX_SLABS)
 812                 fatal("Too many slabs\n");
 813         if (aliases > MAX_ALIASES)
 814                 fatal("Too many aliases\n");
 815 }
 816
 817 void output_slabs(void)
 818 {
 819         struct slabinfo *slab;
 820
 821         for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
 822
 823                 if (slab->alias)
 824                         continue;
 825
 826
 827                 if (show_numa)
 828                         slab_numa(slab);
 829                 else
 830                 if (show_track)
 831                         show_tracking(slab);
 832                 else
 833                 if (validate)
 834                         slab_validate(slab);
 835                 else
 836                 if (shrink)
 837                         slab_shrink(slab);
 838                 else {
 839                         if (show_slab)
 840                                 slabcache(slab);
 841                 }
 842         }
 843 }
 844
 845 struct option opts[] = {
 846         { "aliases", 0, NULL, 'a' },
 847         { "slabs", 0, NULL, 'l' },
 848         { "numa", 0, NULL, 'n' },
 849         { "zero", 0, NULL, 'z' },
 850         { "help", 0, NULL, 'h' },
 851         { "validate", 0, NULL, 'v' },
 852         { "first-alias", 0, NULL, 'f' },
 853         { "shrink", 0, NULL, 's' },
 854         { "track", 0, NULL, 't'},
 855         { "inverted", 0, NULL, 'i'},
 856         { "1ref", 0, NULL, '1'},
 857         { NULL, 0, NULL, 0 }
 858 };
 859
 860 int main(int argc, char *argv[])
 861 {
 862         int c;
 863         int err;
 864         char *pattern_source;
 865
 866         page_size = getpagesize();
 867         if (chdir("/sys/slab"))
 868                 fatal("This kernel does not have SLUB support.\n");
 869
 870         while ((c = getopt_long(argc, argv, "afhil1npstvzTS", opts, NULL)) != -1)
 871         switch(c) {
 872                 case '1':
 873                         show_single_ref = 1;
 874                         break;
 875                 case 'a':
 876                         show_alias = 1;
 877                         break;
 878                 case 'f':
 879                         show_first_alias = 1;
 880                         break;
 881                 case 'h':
 882                         usage();
 883                         return 0;
 884                 case 'i':
 885                         show_inverted = 1;
 886                         break;
 887                 case 'n':
 888                         show_numa = 1;
 889                         break;
 890                 case 's':
 891                         shrink = 1;
 892                         break;
 893                 case 'l':
 894                         show_slab = 1;
 895                         break;
 896                 case 't':
 897                         show_track = 1;
 898                         break;
 899                 case 'v':
 900                         validate = 1;
 901                         break;
 902                 case 'z':
 903                         skip_zero = 0;
 904                         break;
 905                 case 'T':
 906                         show_totals = 1;
 907                         break;
 908                 case 'S':
 909                         sort_size = 1;
 910                         break;
 911
 912                 default:
 913                         fatal("%s: Invalid option '%c'\n", argv[0], optopt);
 914
 915         }
 916
 917         if (!show_slab && !show_alias && !show_track
 918                 && !validate && !shrink)
 919                         show_slab = 1;
 920
 921         if (argc > optind)
 922                 pattern_source = argv[optind];
 923         else
 924                 pattern_source = ".*";
 925
 926         err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
 927         if (err)
 928                 fatal("%s: Invalid pattern '%s' code %d\n",
 929                         argv[0], pattern_source, err);
 930         read_slab_dir();
 931         if (show_alias)
 932                 alias();
 933         else
 934         if (show_totals)
 935                 totals();
 936         else {
 937                 link_slabs();
 938                 rename_slabs();
 939                 sort_slabs();
 940                 output_slabs();
 941         }
 942         return 0;
 943 }