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 #include <errno.h>
  20
  21 #define MAX_SLABS 500
  22 #define MAX_ALIASES 500
  23 #define MAX_NODES 1024
  24
  25 struct slabinfo {
  26         char *name;
  27         int alias;
  28         int refs;
  29         int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
  30         int hwcache_align, object_size, objs_per_slab;
  31         int sanity_checks, slab_size, store_user, trace;
  32         int order, poison, reclaim_account, red_zone;
  33         unsigned long partial, objects, slabs;
  34         int numa[MAX_NODES];
  35         int numa_partial[MAX_NODES];
  36 } slabinfo[MAX_SLABS];
  37
  38 struct aliasinfo {
  39         char *name;
  40         char *ref;
  41         struct slabinfo *slab;
  42 } aliasinfo[MAX_ALIASES];
  43
  44 int slabs = 0;
  45 int actual_slabs = 0;
  46 int aliases = 0;
  47 int alias_targets = 0;
  48 int highest_node = 0;
  49
  50 char buffer[4096];
  51
  52 int show_empty = 0;
  53 int show_report = 0;
  54 int show_alias = 0;
  55 int show_slab = 0;
  56 int skip_zero = 1;
  57 int show_numa = 0;
  58 int show_track = 0;
  59 int show_first_alias = 0;
  60 int validate = 0;
  61 int shrink = 0;
  62 int show_inverted = 0;
  63 int show_single_ref = 0;
  64 int show_totals = 0;
  65 int sort_size = 0;
  66 int set_debug = 0;
  67 int show_ops = 0;
  68
  69 /* Debug options */
  70 int sanity = 0;
  71 int redzone = 0;
  72 int poison = 0;
  73 int tracking = 0;
  74 int tracing = 0;
  75
  76 int page_size;
  77
  78 regex_t pattern;
  79
  80 void fatal(const char *x, ...)
  81 {
  82         va_list ap;
  83
  84         va_start(ap, x);
  85         vfprintf(stderr, x, ap);
  86         va_end(ap);
  87         exit(1);
  88 }
  89
  90 void usage(void)
  91 {
  92         printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\n\n"
  93                 "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
  94                 "-a|--aliases           Show aliases\n"
  95                 "-d<options>|--debug=<options> Set/Clear Debug options\n"
  96                 "-e|--empty             Show empty slabs\n"
  97                 "-f|--first-alias       Show first alias\n"
  98                 "-h|--help              Show usage information\n"
  99                 "-i|--inverted          Inverted list\n"
 100                 "-l|--slabs             Show slabs\n"
 101                 "-n|--numa              Show NUMA information\n"
 102                 "-o|--ops               Show kmem_cache_ops\n"
 103                 "-s|--shrink            Shrink slabs\n"
 104                 "-r|--report            Detailed report on single slabs\n"
 105                 "-S|--Size              Sort by size\n"
 106                 "-t|--tracking          Show alloc/free information\n"
 107                 "-T|--Totals            Show summary information\n"
 108                 "-v|--validate          Validate slabs\n"
 109                 "-z|--zero              Include empty slabs\n"
 110                 "-1|--1ref              Single reference\n"
 111                 "\nValid debug options (FZPUT may be combined)\n"
 112                 "a / A          Switch on all debug options (=FZUP)\n"
 113                 "-              Switch off all debug options\n"
 114                 "f / F          Sanity Checks (SLAB_DEBUG_FREE)\n"
 115                 "z / Z          Redzoning\n"
 116                 "p / P          Poisoning\n"
 117                 "u / U          Tracking\n"
 118                 "t / T          Tracing\n"
 119         );
 120 }
 121
 122 unsigned long read_obj(char *name)
 123 {
 124         FILE *f = fopen(name, "r");
 125
 126         if (!f)
 127                 buffer[0] = 0;
 128         else {
 129                 if (!fgets(buffer,sizeof(buffer), f))
 130                         buffer[0] = 0;
 131                 fclose(f);
 132                 if (buffer[strlen(buffer)] == '\n')
 133                         buffer[strlen(buffer)] = 0;
 134         }
 135         return strlen(buffer);
 136 }
 137
 138
 139 /*
 140  * Get the contents of an attribute
 141  */
 142 unsigned long get_obj(char *name)
 143 {
 144         if (!read_obj(name))
 145                 return 0;
 146
 147         return atol(buffer);
 148 }
 149
 150 unsigned long get_obj_and_str(char *name, char **x)
 151 {
 152         unsigned long result = 0;
 153         char *p;
 154
 155         *x = NULL;
 156
 157         if (!read_obj(name)) {
 158                 x = NULL;
 159                 return 0;
 160         }
 161         result = strtoul(buffer, &p, 10);
 162         while (*p == ' ')
 163                 p++;
 164         if (*p)
 165                 *x = strdup(p);
 166         return result;
 167 }
 168
 169 void set_obj(struct slabinfo *s, char *name, int n)
 170 {
 171         char x[100];
 172         FILE *f;
 173
 174         sprintf(x, "%s/%s", s->name, name);
 175         f = fopen(x, "w");
 176         if (!f)
 177                 fatal("Cannot write to %s\n", x);
 178
 179         fprintf(f, "%d\n", n);
 180         fclose(f);
 181 }
 182
 183 unsigned long read_slab_obj(struct slabinfo *s, char *name)
 184 {
 185         char x[100];
 186         FILE *f;
 187         int l;
 188
 189         sprintf(x, "%s/%s", s->name, name);
 190         f = fopen(x, "r");
 191         if (!f) {
 192                 buffer[0] = 0;
 193                 l = 0;
 194         } else {
 195                 l = fread(buffer, 1, sizeof(buffer), f);
 196                 buffer[l] = 0;
 197                 fclose(f);
 198         }
 199         return l;
 200 }
 201
 202
 203 /*
 204  * Put a size string together
 205  */
 206 int store_size(char *buffer, unsigned long value)
 207 {
 208         unsigned long divisor = 1;
 209         char trailer = 0;
 210         int n;
 211
 212         if (value > 1000000000UL) {
 213                 divisor = 100000000UL;
 214                 trailer = 'G';
 215         } else if (value > 1000000UL) {
 216                 divisor = 100000UL;
 217                 trailer = 'M';
 218         } else if (value > 1000UL) {
 219                 divisor = 100;
 220                 trailer = 'K';
 221         }
 222
 223         value /= divisor;
 224         n = sprintf(buffer, "%ld",value);
 225         if (trailer) {
 226                 buffer[n] = trailer;
 227                 n++;
 228                 buffer[n] = 0;
 229         }
 230         if (divisor != 1) {
 231                 memmove(buffer + n - 2, buffer + n - 3, 4);
 232                 buffer[n-2] = '.';
 233                 n++;
 234         }
 235         return n;
 236 }
 237
 238 void decode_numa_list(int *numa, char *t)
 239 {
 240         int node;
 241         int nr;
 242
 243         memset(numa, 0, MAX_NODES * sizeof(int));
 244
 245         while (*t == 'N') {
 246                 t++;
 247                 node = strtoul(t, &t, 10);
 248                 if (*t == '=') {
 249                         t++;
 250                         nr = strtoul(t, &t, 10);
 251                         numa[node] = nr;
 252                         if (node > highest_node)
 253                                 highest_node = node;
 254                 }
 255                 while (*t == ' ')
 256                         t++;
 257         }
 258 }
 259
 260 void slab_validate(struct slabinfo *s)
 261 {
 262         set_obj(s, "validate", 1);
 263 }
 264
 265 void slab_shrink(struct slabinfo *s)
 266 {
 267         set_obj(s, "shrink", 1);
 268 }
 269
 270 int line = 0;
 271
 272 void first_line(void)
 273 {
 274         printf("Name                   Objects Objsize    Space "
 275                 "Slabs/Part/Cpu  O/S O %%Fr %%Ef Flg\n");
 276 }
 277
 278 /*
 279  * Find the shortest alias of a slab
 280  */
 281 struct aliasinfo *find_one_alias(struct slabinfo *find)
 282 {
 283         struct aliasinfo *a;
 284         struct aliasinfo *best = NULL;
 285
 286         for(a = aliasinfo;a < aliasinfo + aliases; a++) {
 287                 if (a->slab == find &&
 288                         (!best || strlen(best->name) < strlen(a->name))) {
 289                                 best = a;
 290                                 if (strncmp(a->name,"kmall", 5) == 0)
 291                                         return best;
 292                         }
 293         }
 294         return best;
 295 }
 296
 297 unsigned long slab_size(struct slabinfo *s)
 298 {
 299         return  s->slabs * (page_size << s->order);
 300 }
 301
 302 void slab_numa(struct slabinfo *s, int mode)
 303 {
 304         int node;
 305
 306         if (strcmp(s->name, "*") == 0)
 307                 return;
 308
 309         if (!highest_node) {
 310                 printf("\n%s: No NUMA information available.\n", s->name);
 311                 return;
 312         }
 313
 314         if (skip_zero && !s->slabs)
 315                 return;
 316
 317         if (!line) {
 318                 printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
 319                 for(node = 0; node <= highest_node; node++)
 320                         printf(" %4d", node);
 321                 printf("\n----------------------");
 322                 for(node = 0; node <= highest_node; node++)
 323                         printf("-----");
 324                 printf("\n");
 325         }
 326         printf("%-21s ", mode ? "All slabs" : s->name);
 327         for(node = 0; node <= highest_node; node++) {
 328                 char b[20];
 329
 330                 store_size(b, s->numa[node]);
 331                 printf(" %4s", b);
 332         }
 333         printf("\n");
 334         if (mode) {
 335                 printf("%-21s ", "Partial slabs");
 336                 for(node = 0; node <= highest_node; node++) {
 337                         char b[20];
 338
 339                         store_size(b, s->numa_partial[node]);
 340                         printf(" %4s", b);
 341                 }
 342                 printf("\n");
 343         }
 344         line++;
 345 }
 346
 347 void show_tracking(struct slabinfo *s)
 348 {
 349         printf("\n%s: Kernel object allocation\n", s->name);
 350         printf("-----------------------------------------------------------------------\n");
 351         if (read_slab_obj(s, "alloc_calls"))
 352                 printf(buffer);
 353         else
 354                 printf("No Data\n");
 355
 356         printf("\n%s: Kernel object freeing\n", s->name);
 357         printf("------------------------------------------------------------------------\n");
 358         if (read_slab_obj(s, "free_calls"))
 359                 printf(buffer);
 360         else
 361                 printf("No Data\n");
 362
 363 }
 364
 365 void ops(struct slabinfo *s)
 366 {
 367         if (strcmp(s->name, "*") == 0)
 368                 return;
 369
 370         if (read_slab_obj(s, "ops")) {
 371                 printf("\n%s: kmem_cache operations\n", s->name);
 372                 printf("--------------------------------------------\n");
 373                 printf(buffer);
 374         } else
 375                 printf("\n%s has no kmem_cache operations\n", s->name);
 376 }
 377
 378 const char *onoff(int x)
 379 {
 380         if (x)
 381                 return "On ";
 382         return "Off";
 383 }
 384
 385 void report(struct slabinfo *s)
 386 {
 387         if (strcmp(s->name, "*") == 0)
 388                 return;
 389         printf("\nSlabcache: %-20s  Aliases: %2d Order : %2d\n", s->name, s->aliases, s->order);
 390         if (s->hwcache_align)
 391                 printf("** Hardware cacheline aligned\n");
 392         if (s->cache_dma)
 393                 printf("** Memory is allocated in a special DMA zone\n");
 394         if (s->destroy_by_rcu)
 395                 printf("** Slabs are destroyed via RCU\n");
 396         if (s->reclaim_account)
 397                 printf("** Reclaim accounting active\n");
 398
 399         printf("\nSizes (bytes)     Slabs              Debug                Memory\n");
 400         printf("------------------------------------------------------------------------\n");
 401         printf("Object : %7d  Total  : %7ld   Sanity Checks : %s  Total: %7ld\n",
 402                         s->object_size, s->slabs, onoff(s->sanity_checks),
 403                         s->slabs * (page_size << s->order));
 404         printf("SlabObj: %7d  Full   : %7ld   Redzoning     : %s  Used : %7ld\n",
 405                         s->slab_size, s->slabs - s->partial - s->cpu_slabs,
 406                         onoff(s->red_zone), s->objects * s->object_size);
 407         printf("SlabSiz: %7d  Partial: %7ld   Poisoning     : %s  Loss : %7ld\n",
 408                         page_size << s->order, s->partial, onoff(s->poison),
 409                         s->slabs * (page_size << s->order) - s->objects * s->object_size);
 410         printf("Loss   : %7d  CpuSlab: %7d   Tracking      : %s  Lalig: %7ld\n",
 411                         s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
 412                         (s->slab_size - s->object_size) * s->objects);
 413         printf("Align  : %7d  Objects: %7d   Tracing       : %s  Lpadd: %7ld\n",
 414                         s->align, s->objs_per_slab, onoff(s->trace),
 415                         ((page_size << s->order) - s->objs_per_slab * s->slab_size) *
 416                         s->slabs);
 417
 418         ops(s);
 419         show_tracking(s);
 420         slab_numa(s, 1);
 421 }
 422
 423 void slabcache(struct slabinfo *s)
 424 {
 425         char size_str[20];
 426         char dist_str[40];
 427         char flags[20];
 428         char *p = flags;
 429
 430         if (strcmp(s->name, "*") == 0)
 431                 return;
 432
 433         if (actual_slabs == 1) {
 434                 report(s);
 435                 return;
 436         }
 437
 438         if (skip_zero && !show_empty && !s->slabs)
 439                 return;
 440
 441         if (show_empty && s->slabs)
 442                 return;
 443
 444         store_size(size_str, slab_size(s));
 445         sprintf(dist_str,"%lu/%lu/%d", s->slabs, s->partial, s->cpu_slabs);
 446
 447         if (!line++)
 448                 first_line();
 449
 450         if (s->aliases)
 451                 *p++ = '*';
 452         if (s->cache_dma)
 453                 *p++ = 'd';
 454         if (s->hwcache_align)
 455                 *p++ = 'A';
 456         if (s->poison)
 457                 *p++ = 'P';
 458         if (s->reclaim_account)
 459                 *p++ = 'a';
 460         if (s->red_zone)
 461                 *p++ = 'Z';
 462         if (s->sanity_checks)
 463                 *p++ = 'F';
 464         if (s->store_user)
 465                 *p++ = 'U';
 466         if (s->trace)
 467                 *p++ = 'T';
 468
 469         *p = 0;
 470         printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
 471                 s->name, s->objects, s->object_size, size_str, dist_str,
 472                 s->objs_per_slab, s->order,
 473                 s->slabs ? (s->partial * 100) / s->slabs : 100,
 474                 s->slabs ? (s->objects * s->object_size * 100) /
 475                         (s->slabs * (page_size << s->order)) : 100,
 476                 flags);
 477 }
 478
 479 /*
 480  * Analyze debug options. Return false if something is amiss.
 481  */
 482 int debug_opt_scan(char *opt)
 483 {
 484         if (!opt || !opt[0] || strcmp(opt, "-") == 0)
 485                 return 1;
 486
 487         if (strcasecmp(opt, "a") == 0) {
 488                 sanity = 1;
 489                 poison = 1;
 490                 redzone = 1;
 491                 tracking = 1;
 492                 return 1;
 493         }
 494
 495         for ( ; *opt; opt++)
 496                 switch (*opt) {
 497                 case 'F' : case 'f':
 498                         if (sanity)
 499                                 return 0;
 500                         sanity = 1;
 501                         break;
 502                 case 'P' : case 'p':
 503                         if (poison)
 504                                 return 0;
 505                         poison = 1;
 506                         break;
 507
 508                 case 'Z' : case 'z':
 509                         if (redzone)
 510                                 return 0;
 511                         redzone = 1;
 512                         break;
 513
 514                 case 'U' : case 'u':
 515                         if (tracking)
 516                                 return 0;
 517                         tracking = 1;
 518                         break;
 519
 520                 case 'T' : case 't':
 521                         if (tracing)
 522                                 return 0;
 523                         tracing = 1;
 524                         break;
 525                 default:
 526                         return 0;
 527                 }
 528         return 1;
 529 }
 530
 531 int slab_empty(struct slabinfo *s)
 532 {
 533         if (s->objects > 0)
 534                 return 0;
 535
 536         /*
 537          * We may still have slabs even if there are no objects. Shrinking will
 538          * remove them.
 539          */
 540         if (s->slabs != 0)
 541                 set_obj(s, "shrink", 1);
 542
 543         return 1;
 544 }
 545
 546 void slab_debug(struct slabinfo *s)
 547 {
 548         if (sanity && !s->sanity_checks) {
 549                 set_obj(s, "sanity", 1);
 550         }
 551         if (!sanity && s->sanity_checks) {
 552                 if (slab_empty(s))
 553                         set_obj(s, "sanity", 0);
 554                 else
 555                         fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
 556         }
 557         if (redzone && !s->red_zone) {
 558                 if (slab_empty(s))
 559                         set_obj(s, "red_zone", 1);
 560                 else
 561                         fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
 562         }
 563         if (!redzone && s->red_zone) {
 564                 if (slab_empty(s))
 565                         set_obj(s, "red_zone", 0);
 566                 else
 567                         fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
 568         }
 569         if (poison && !s->poison) {
 570                 if (slab_empty(s))
 571                         set_obj(s, "poison", 1);
 572                 else
 573                         fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
 574         }
 575         if (!poison && s->poison) {
 576                 if (slab_empty(s))
 577                         set_obj(s, "poison", 0);
 578                 else
 579                         fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
 580         }
 581         if (tracking && !s->store_user) {
 582                 if (slab_empty(s))
 583                         set_obj(s, "store_user", 1);
 584                 else
 585                         fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
 586         }
 587         if (!tracking && s->store_user) {
 588                 if (slab_empty(s))
 589                         set_obj(s, "store_user", 0);
 590                 else
 591                         fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
 592         }
 593         if (tracing && !s->trace) {
 594                 if (slabs == 1)
 595                         set_obj(s, "trace", 1);
 596                 else
 597                         fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
 598         }
 599         if (!tracing && s->trace)
 600                 set_obj(s, "trace", 1);
 601 }
 602
 603 void totals(void)
 604 {
 605         struct slabinfo *s;
 606
 607         int used_slabs = 0;
 608         char b1[20], b2[20], b3[20], b4[20];
 609         unsigned long long max = 1ULL << 63;
 610
 611         /* Object size */
 612         unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
 613
 614         /* Number of partial slabs in a slabcache */
 615         unsigned long long min_partial = max, max_partial = 0,
 616                                 avg_partial, total_partial = 0;
 617
 618         /* Number of slabs in a slab cache */
 619         unsigned long long min_slabs = max, max_slabs = 0,
 620                                 avg_slabs, total_slabs = 0;
 621
 622         /* Size of the whole slab */
 623         unsigned long long min_size = max, max_size = 0,
 624                                 avg_size, total_size = 0;
 625
 626         /* Bytes used for object storage in a slab */
 627         unsigned long long min_used = max, max_used = 0,
 628                                 avg_used, total_used = 0;
 629
 630         /* Waste: Bytes used for alignment and padding */
 631         unsigned long long min_waste = max, max_waste = 0,
 632                                 avg_waste, total_waste = 0;
 633         /* Number of objects in a slab */
 634         unsigned long long min_objects = max, max_objects = 0,
 635                                 avg_objects, total_objects = 0;
 636         /* Waste per object */
 637         unsigned long long min_objwaste = max,
 638                                 max_objwaste = 0, avg_objwaste,
 639                                 total_objwaste = 0;
 640
 641         /* Memory per object */
 642         unsigned long long min_memobj = max,
 643                                 max_memobj = 0, avg_memobj,
 644                                 total_objsize = 0;
 645
 646         /* Percentage of partial slabs per slab */
 647         unsigned long min_ppart = 100, max_ppart = 0,
 648                                 avg_ppart, total_ppart = 0;
 649
 650         /* Number of objects in partial slabs */
 651         unsigned long min_partobj = max, max_partobj = 0,
 652                                 avg_partobj, total_partobj = 0;
 653
 654         /* Percentage of partial objects of all objects in a slab */
 655         unsigned long min_ppartobj = 100, max_ppartobj = 0,
 656                                 avg_ppartobj, total_ppartobj = 0;
 657
 658
 659         for (s = slabinfo; s < slabinfo + slabs; s++) {
 660                 unsigned long long size;
 661                 unsigned long used;
 662                 unsigned long long wasted;
 663                 unsigned long long objwaste;
 664                 long long objects_in_partial_slabs;
 665                 unsigned long percentage_partial_slabs;
 666                 unsigned long percentage_partial_objs;
 667
 668                 if (!s->slabs || !s->objects)
 669                         continue;
 670
 671                 used_slabs++;
 672
 673                 size = slab_size(s);
 674                 used = s->objects * s->object_size;
 675                 wasted = size - used;
 676                 objwaste = s->slab_size - s->object_size;
 677
 678                 objects_in_partial_slabs = s->objects -
 679                         (s->slabs - s->partial - s ->cpu_slabs) *
 680                         s->objs_per_slab;
 681
 682                 if (objects_in_partial_slabs < 0)
 683                         objects_in_partial_slabs = 0;
 684
 685                 percentage_partial_slabs = s->partial * 100 / s->slabs;
 686                 if (percentage_partial_slabs > 100)
 687                         percentage_partial_slabs = 100;
 688
 689                 percentage_partial_objs = objects_in_partial_slabs * 100
 690                                                         / s->objects;
 691
 692                 if (percentage_partial_objs > 100)
 693                         percentage_partial_objs = 100;
 694
 695                 if (s->object_size < min_objsize)
 696                         min_objsize = s->object_size;
 697                 if (s->partial < min_partial)
 698                         min_partial = s->partial;
 699                 if (s->slabs < min_slabs)
 700                         min_slabs = s->slabs;
 701                 if (size < min_size)
 702                         min_size = size;
 703                 if (wasted < min_waste)
 704                         min_waste = wasted;
 705                 if (objwaste < min_objwaste)
 706                         min_objwaste = objwaste;
 707                 if (s->objects < min_objects)
 708                         min_objects = s->objects;
 709                 if (used < min_used)
 710                         min_used = used;
 711                 if (objects_in_partial_slabs < min_partobj)
 712                         min_partobj = objects_in_partial_slabs;
 713                 if (percentage_partial_slabs < min_ppart)
 714                         min_ppart = percentage_partial_slabs;
 715                 if (percentage_partial_objs < min_ppartobj)
 716                         min_ppartobj = percentage_partial_objs;
 717                 if (s->slab_size < min_memobj)
 718                         min_memobj = s->slab_size;
 719
 720                 if (s->object_size > max_objsize)
 721                         max_objsize = s->object_size;
 722                 if (s->partial > max_partial)
 723                         max_partial = s->partial;
 724                 if (s->slabs > max_slabs)
 725                         max_slabs = s->slabs;
 726                 if (size > max_size)
 727                         max_size = size;
 728                 if (wasted > max_waste)
 729                         max_waste = wasted;
 730                 if (objwaste > max_objwaste)
 731                         max_objwaste = objwaste;
 732                 if (s->objects > max_objects)
 733                         max_objects = s->objects;
 734                 if (used > max_used)
 735                         max_used = used;
 736                 if (objects_in_partial_slabs > max_partobj)
 737                         max_partobj = objects_in_partial_slabs;
 738                 if (percentage_partial_slabs > max_ppart)
 739                         max_ppart = percentage_partial_slabs;
 740                 if (percentage_partial_objs > max_ppartobj)
 741                         max_ppartobj = percentage_partial_objs;
 742                 if (s->slab_size > max_memobj)
 743                         max_memobj = s->slab_size;
 744
 745                 total_partial += s->partial;
 746                 total_slabs += s->slabs;
 747                 total_size += size;
 748                 total_waste += wasted;
 749
 750                 total_objects += s->objects;
 751                 total_used += used;
 752                 total_partobj += objects_in_partial_slabs;
 753                 total_ppart += percentage_partial_slabs;
 754                 total_ppartobj += percentage_partial_objs;
 755
 756                 total_objwaste += s->objects * objwaste;
 757                 total_objsize += s->objects * s->slab_size;
 758         }
 759
 760         if (!total_objects) {
 761                 printf("No objects\n");
 762                 return;
 763         }
 764         if (!used_slabs) {
 765                 printf("No slabs\n");
 766                 return;
 767         }
 768
 769         /* Per slab averages */
 770         avg_partial = total_partial / used_slabs;
 771         avg_slabs = total_slabs / used_slabs;
 772         avg_size = total_size / used_slabs;
 773         avg_waste = total_waste / used_slabs;
 774
 775         avg_objects = total_objects / used_slabs;
 776         avg_used = total_used / used_slabs;
 777         avg_partobj = total_partobj / used_slabs;
 778         avg_ppart = total_ppart / used_slabs;
 779         avg_ppartobj = total_ppartobj / used_slabs;
 780
 781         /* Per object object sizes */
 782         avg_objsize = total_used / total_objects;
 783         avg_objwaste = total_objwaste / total_objects;
 784         avg_partobj = total_partobj * 100 / total_objects;
 785         avg_memobj = total_objsize / total_objects;
 786
 787         printf("Slabcache Totals\n");
 788         printf("----------------\n");
 789         printf("Slabcaches : %3d      Aliases  : %3d->%-3d Active: %3d\n",
 790                         slabs, aliases, alias_targets, used_slabs);
 791
 792         store_size(b1, total_size);store_size(b2, total_waste);
 793         store_size(b3, total_waste * 100 / total_used);
 794         printf("Memory used: %6s   # Loss   : %6s   MRatio: %6s%%\n", b1, b2, b3);
 795
 796         store_size(b1, total_objects);store_size(b2, total_partobj);
 797         store_size(b3, total_partobj * 100 / total_objects);
 798         printf("# Objects  : %6s   # PartObj: %6s   ORatio: %6s%%\n", b1, b2, b3);
 799
 800         printf("\n");
 801         printf("Per Cache    Average         Min         Max       Total\n");
 802         printf("---------------------------------------------------------\n");
 803
 804         store_size(b1, avg_objects);store_size(b2, min_objects);
 805         store_size(b3, max_objects);store_size(b4, total_objects);
 806         printf("#Objects  %10s  %10s  %10s  %10s\n",
 807                         b1,     b2,     b3,     b4);
 808
 809         store_size(b1, avg_slabs);store_size(b2, min_slabs);
 810         store_size(b3, max_slabs);store_size(b4, total_slabs);
 811         printf("#Slabs    %10s  %10s  %10s  %10s\n",
 812                         b1,     b2,     b3,     b4);
 813
 814         store_size(b1, avg_partial);store_size(b2, min_partial);
 815         store_size(b3, max_partial);store_size(b4, total_partial);
 816         printf("#PartSlab %10s  %10s  %10s  %10s\n",
 817                         b1,     b2,     b3,     b4);
 818         store_size(b1, avg_ppart);store_size(b2, min_ppart);
 819         store_size(b3, max_ppart);
 820         store_size(b4, total_partial * 100  / total_slabs);
 821         printf("%%PartSlab %10s%% %10s%% %10s%% %10s%%\n",
 822                         b1,     b2,     b3,     b4);
 823
 824         store_size(b1, avg_partobj);store_size(b2, min_partobj);
 825         store_size(b3, max_partobj);
 826         store_size(b4, total_partobj);
 827         printf("PartObjs  %10s  %10s  %10s  %10s\n",
 828                         b1,     b2,     b3,     b4);
 829
 830         store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
 831         store_size(b3, max_ppartobj);
 832         store_size(b4, total_partobj * 100 / total_objects);
 833         printf("%% PartObj %10s%% %10s%% %10s%% %10s%%\n",
 834                         b1,     b2,     b3,     b4);
 835
 836         store_size(b1, avg_size);store_size(b2, min_size);
 837         store_size(b3, max_size);store_size(b4, total_size);
 838         printf("Memory    %10s  %10s  %10s  %10s\n",
 839                         b1,     b2,     b3,     b4);
 840
 841         store_size(b1, avg_used);store_size(b2, min_used);
 842         store_size(b3, max_used);store_size(b4, total_used);
 843         printf("Used      %10s  %10s  %10s  %10s\n",
 844                         b1,     b2,     b3,     b4);
 845
 846         store_size(b1, avg_waste);store_size(b2, min_waste);
 847         store_size(b3, max_waste);store_size(b4, total_waste);
 848         printf("Loss      %10s  %10s  %10s  %10s\n",
 849                         b1,     b2,     b3,     b4);
 850
 851         printf("\n");
 852         printf("Per Object   Average         Min         Max\n");
 853         printf("---------------------------------------------\n");
 854
 855         store_size(b1, avg_memobj);store_size(b2, min_memobj);
 856         store_size(b3, max_memobj);
 857         printf("Memory    %10s  %10s  %10s\n",
 858                         b1,     b2,     b3);
 859         store_size(b1, avg_objsize);store_size(b2, min_objsize);
 860         store_size(b3, max_objsize);
 861         printf("User      %10s  %10s  %10s\n",
 862                         b1,     b2,     b3);
 863
 864         store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
 865         store_size(b3, max_objwaste);
 866         printf("Loss      %10s  %10s  %10s\n",
 867                         b1,     b2,     b3);
 868 }
 869
 870 void sort_slabs(void)
 871 {
 872         struct slabinfo *s1,*s2;
 873
 874         for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
 875                 for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
 876                         int result;
 877
 878                         if (sort_size)
 879                                 result = slab_size(s1) < slab_size(s2);
 880                         else
 881                                 result = strcasecmp(s1->name, s2->name);
 882
 883                         if (show_inverted)
 884                                 result = -result;
 885
 886                         if (result > 0) {
 887                                 struct slabinfo t;
 888
 889                                 memcpy(&t, s1, sizeof(struct slabinfo));
 890                                 memcpy(s1, s2, sizeof(struct slabinfo));
 891                                 memcpy(s2, &t, sizeof(struct slabinfo));
 892                         }
 893                 }
 894         }
 895 }
 896
 897 void sort_aliases(void)
 898 {
 899         struct aliasinfo *a1,*a2;
 900
 901         for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
 902                 for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
 903                         char *n1, *n2;
 904
 905                         n1 = a1->name;
 906                         n2 = a2->name;
 907                         if (show_alias && !show_inverted) {
 908                                 n1 = a1->ref;
 909                                 n2 = a2->ref;
 910                         }
 911                         if (strcasecmp(n1, n2) > 0) {
 912                                 struct aliasinfo t;
 913
 914                                 memcpy(&t, a1, sizeof(struct aliasinfo));
 915                                 memcpy(a1, a2, sizeof(struct aliasinfo));
 916                                 memcpy(a2, &t, sizeof(struct aliasinfo));
 917                         }
 918                 }
 919         }
 920 }
 921
 922 void link_slabs(void)
 923 {
 924         struct aliasinfo *a;
 925         struct slabinfo *s;
 926
 927         for (a = aliasinfo; a < aliasinfo + aliases; a++) {
 928
 929                 for (s = slabinfo; s < slabinfo + slabs; s++)
 930                         if (strcmp(a->ref, s->name) == 0) {
 931                                 a->slab = s;
 932                                 s->refs++;
 933                                 break;
 934                         }
 935                 if (s == slabinfo + slabs)
 936                         fatal("Unresolved alias %s\n", a->ref);
 937         }
 938 }
 939
 940 void alias(void)
 941 {
 942         struct aliasinfo *a;
 943         char *active = NULL;
 944
 945         sort_aliases();
 946         link_slabs();
 947
 948         for(a = aliasinfo; a < aliasinfo + aliases; a++) {
 949
 950                 if (!show_single_ref && a->slab->refs == 1)
 951                         continue;
 952
 953                 if (!show_inverted) {
 954                         if (active) {
 955                                 if (strcmp(a->slab->name, active) == 0) {
 956                                         printf(" %s", a->name);
 957                                         continue;
 958                                 }
 959                         }
 960                         printf("\n%-12s <- %s", a->slab->name, a->name);
 961                         active = a->slab->name;
 962                 }
 963                 else
 964                         printf("%-20s -> %s\n", a->name, a->slab->name);
 965         }
 966         if (active)
 967                 printf("\n");
 968 }
 969
 970
 971 void rename_slabs(void)
 972 {
 973         struct slabinfo *s;
 974         struct aliasinfo *a;
 975
 976         for (s = slabinfo; s < slabinfo + slabs; s++) {
 977                 if (*s->name != ':')
 978                         continue;
 979
 980                 if (s->refs > 1 && !show_first_alias)
 981                         continue;
 982
 983                 a = find_one_alias(s);
 984
 985                 if (a)
 986                         s->name = a->name;
 987                 else {
 988                         s->name = "*";
 989                         actual_slabs--;
 990                 }
 991         }
 992 }
 993
 994 int slab_mismatch(char *slab)
 995 {
 996         return regexec(&pattern, slab, 0, NULL, 0);
 997 }
 998
 999 void read_slab_dir(void)
1000 {
1001         DIR *dir;
1002         struct dirent *de;
1003         struct slabinfo *slab = slabinfo;
1004         struct aliasinfo *alias = aliasinfo;
1005         char *p;
1006         char *t;
1007         int count;
1008
1009         if (chdir("/sys/slab"))
1010                 fatal("SYSFS support for SLUB not active\n");
1011
1012         dir = opendir(".");
1013         while ((de = readdir(dir))) {
1014                 if (de->d_name[0] == '.' ||
1015                         (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1016                                 continue;
1017                 switch (de->d_type) {
1018                    case DT_LNK:
1019                         alias->name = strdup(de->d_name);
1020                         count = readlink(de->d_name, buffer, sizeof(buffer));
1021
1022                         if (count < 0)
1023                                 fatal("Cannot read symlink %s\n", de->d_name);
1024
1025                         buffer[count] = 0;
1026                         p = buffer + count;
1027                         while (p > buffer && p[-1] != '/')
1028                                 p--;
1029                         alias->ref = strdup(p);
1030                         alias++;
1031                         break;
1032                    case DT_DIR:
1033                         if (chdir(de->d_name))
1034                                 fatal("Unable to access slab %s\n", slab->name);
1035                         slab->name = strdup(de->d_name);
1036                         slab->alias = 0;
1037                         slab->refs = 0;
1038                         slab->aliases = get_obj("aliases");
1039                         slab->align = get_obj("align");
1040                         slab->cache_dma = get_obj("cache_dma");
1041                         slab->cpu_slabs = get_obj("cpu_slabs");
1042                         slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1043                         slab->hwcache_align = get_obj("hwcache_align");
1044                         slab->object_size = get_obj("object_size");
1045                         slab->objects = get_obj("objects");
1046                         slab->objs_per_slab = get_obj("objs_per_slab");
1047                         slab->order = get_obj("order");
1048                         slab->partial = get_obj("partial");
1049                         slab->partial = get_obj_and_str("partial", &t);
1050                         decode_numa_list(slab->numa_partial, t);
1051                         slab->poison = get_obj("poison");
1052                         slab->reclaim_account = get_obj("reclaim_account");
1053                         slab->red_zone = get_obj("red_zone");
1054                         slab->sanity_checks = get_obj("sanity_checks");
1055                         slab->slab_size = get_obj("slab_size");
1056                         slab->slabs = get_obj_and_str("slabs", &t);
1057                         decode_numa_list(slab->numa, t);
1058                         slab->store_user = get_obj("store_user");
1059                         slab->trace = get_obj("trace");
1060                         chdir("..");
1061                         if (slab->name[0] == ':')
1062                                 alias_targets++;
1063                         slab++;
1064                         break;
1065                    default :
1066                         fatal("Unknown file type %lx\n", de->d_type);
1067                 }
1068         }
1069         closedir(dir);
1070         slabs = slab - slabinfo;
1071         actual_slabs = slabs;
1072         aliases = alias - aliasinfo;
1073         if (slabs > MAX_SLABS)
1074                 fatal("Too many slabs\n");
1075         if (aliases > MAX_ALIASES)
1076                 fatal("Too many aliases\n");
1077 }
1078
1079 void output_slabs(void)
1080 {
1081         struct slabinfo *slab;
1082
1083         for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
1084
1085                 if (slab->alias)
1086                         continue;
1087
1088
1089                 if (show_numa)
1090                         slab_numa(slab, 0);
1091                 else if (show_track)
1092                         show_tracking(slab);
1093                 else if (validate)
1094                         slab_validate(slab);
1095                 else if (shrink)
1096                         slab_shrink(slab);
1097                 else if (set_debug)
1098                         slab_debug(slab);
1099                 else if (show_ops)
1100                         ops(slab);
1101                 else if (show_slab)
1102                         slabcache(slab);
1103         }
1104 }
1105
1106 struct option opts[] = {
1107         { "aliases", 0, NULL, 'a' },
1108         { "debug", 2, NULL, 'd' },
1109         { "empty", 0, NULL, 'e' },
1110         { "first-alias", 0, NULL, 'f' },
1111         { "help", 0, NULL, 'h' },
1112         { "inverted", 0, NULL, 'i'},
1113         { "numa", 0, NULL, 'n' },
1114         { "ops", 0, NULL, 'o' },
1115         { "report", 0, NULL, 'r' },
1116         { "shrink", 0, NULL, 's' },
1117         { "slabs", 0, NULL, 'l' },
1118         { "track", 0, NULL, 't'},
1119         { "validate", 0, NULL, 'v' },
1120         { "zero", 0, NULL, 'z' },
1121         { "1ref", 0, NULL, '1'},
1122         { NULL, 0, NULL, 0 }
1123 };
1124
1125 int main(int argc, char *argv[])
1126 {
1127         int c;
1128         int err;
1129         char *pattern_source;
1130
1131         page_size = getpagesize();
1132
1133         while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
1134                                                 opts, NULL)) != -1)
1135         switch(c) {
1136                 case '1':
1137                         show_single_ref = 1;
1138                         break;
1139                 case 'a':
1140                         show_alias = 1;
1141                         break;
1142                 case 'd':
1143                         set_debug = 1;
1144                         if (!debug_opt_scan(optarg))
1145                                 fatal("Invalid debug option '%s'\n", optarg);
1146                         break;
1147                 case 'e':
1148                         show_empty = 1;
1149                         break;
1150                 case 'f':
1151                         show_first_alias = 1;
1152                         break;
1153                 case 'h':
1154                         usage();
1155                         return 0;
1156                 case 'i':
1157                         show_inverted = 1;
1158                         break;
1159                 case 'n':
1160                         show_numa = 1;
1161                         break;
1162                 case 'o':
1163                         show_ops = 1;
1164                         break;
1165                 case 'r':
1166                         show_report = 1;
1167                         break;
1168                 case 's':
1169                         shrink = 1;
1170                         break;
1171                 case 'l':
1172                         show_slab = 1;
1173                         break;
1174                 case 't':
1175                         show_track = 1;
1176                         break;
1177                 case 'v':
1178                         validate = 1;
1179                         break;
1180                 case 'z':
1181                         skip_zero = 0;
1182                         break;
1183                 case 'T':
1184                         show_totals = 1;
1185                         break;
1186                 case 'S':
1187                         sort_size = 1;
1188                         break;
1189
1190                 default:
1191                         fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1192
1193         }
1194
1195         if (!show_slab && !show_alias && !show_track && !show_report
1196                 && !validate && !shrink && !set_debug && !show_ops)
1197                         show_slab = 1;
1198
1199         if (argc > optind)
1200                 pattern_source = argv[optind];
1201         else
1202                 pattern_source = ".*";
1203
1204         err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1205         if (err)
1206                 fatal("%s: Invalid pattern '%s' code %d\n",
1207                         argv[0], pattern_source, err);
1208         read_slab_dir();
1209         if (show_alias)
1210                 alias();
1211         else
1212         if (show_totals)
1213                 totals();
1214         else {
1215                 link_slabs();
1216                 rename_slabs();
1217                 sort_slabs();
1218                 output_slabs();
1219         }
1220         return 0;
1221 }