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         if (!t)
 246                 return;
 247
 248         while (*t == 'N') {
 249                 t++;
 250                 node = strtoul(t, &t, 10);
 251                 if (*t == '=') {
 252                         t++;
 253                         nr = strtoul(t, &t, 10);
 254                         numa[node] = nr;
 255                         if (node > highest_node)
 256                                 highest_node = node;
 257                 }
 258                 while (*t == ' ')
 259                         t++;
 260         }
 261 }
 262
 263 void slab_validate(struct slabinfo *s)
 264 {
 265         if (strcmp(s->name, "*") == 0)
 266                 return;
 267
 268         set_obj(s, "validate", 1);
 269 }
 270
 271 void slab_shrink(struct slabinfo *s)
 272 {
 273         if (strcmp(s->name, "*") == 0)
 274                 return;
 275
 276         set_obj(s, "shrink", 1);
 277 }
 278
 279 int line = 0;
 280
 281 void first_line(void)
 282 {
 283         printf("Name                   Objects Objsize    Space "
 284                 "Slabs/Part/Cpu  O/S O %%Fr %%Ef Flg\n");
 285 }
 286
 287 /*
 288  * Find the shortest alias of a slab
 289  */
 290 struct aliasinfo *find_one_alias(struct slabinfo *find)
 291 {
 292         struct aliasinfo *a;
 293         struct aliasinfo *best = NULL;
 294
 295         for(a = aliasinfo;a < aliasinfo + aliases; a++) {
 296                 if (a->slab == find &&
 297                         (!best || strlen(best->name) < strlen(a->name))) {
 298                                 best = a;
 299                                 if (strncmp(a->name,"kmall", 5) == 0)
 300                                         return best;
 301                         }
 302         }
 303         return best;
 304 }
 305
 306 unsigned long slab_size(struct slabinfo *s)
 307 {
 308         return  s->slabs * (page_size << s->order);
 309 }
 310
 311 void slab_numa(struct slabinfo *s, int mode)
 312 {
 313         int node;
 314
 315         if (strcmp(s->name, "*") == 0)
 316                 return;
 317
 318         if (!highest_node) {
 319                 printf("\n%s: No NUMA information available.\n", s->name);
 320                 return;
 321         }
 322
 323         if (skip_zero && !s->slabs)
 324                 return;
 325
 326         if (!line) {
 327                 printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
 328                 for(node = 0; node <= highest_node; node++)
 329                         printf(" %4d", node);
 330                 printf("\n----------------------");
 331                 for(node = 0; node <= highest_node; node++)
 332                         printf("-----");
 333                 printf("\n");
 334         }
 335         printf("%-21s ", mode ? "All slabs" : s->name);
 336         for(node = 0; node <= highest_node; node++) {
 337                 char b[20];
 338
 339                 store_size(b, s->numa[node]);
 340                 printf(" %4s", b);
 341         }
 342         printf("\n");
 343         if (mode) {
 344                 printf("%-21s ", "Partial slabs");
 345                 for(node = 0; node <= highest_node; node++) {
 346                         char b[20];
 347
 348                         store_size(b, s->numa_partial[node]);
 349                         printf(" %4s", b);
 350                 }
 351                 printf("\n");
 352         }
 353         line++;
 354 }
 355
 356 void show_tracking(struct slabinfo *s)
 357 {
 358         printf("\n%s: Kernel object allocation\n", s->name);
 359         printf("-----------------------------------------------------------------------\n");
 360         if (read_slab_obj(s, "alloc_calls"))
 361                 printf(buffer);
 362         else
 363                 printf("No Data\n");
 364
 365         printf("\n%s: Kernel object freeing\n", s->name);
 366         printf("------------------------------------------------------------------------\n");
 367         if (read_slab_obj(s, "free_calls"))
 368                 printf(buffer);
 369         else
 370                 printf("No Data\n");
 371
 372 }
 373
 374 void ops(struct slabinfo *s)
 375 {
 376         if (strcmp(s->name, "*") == 0)
 377                 return;
 378
 379         if (read_slab_obj(s, "ops")) {
 380                 printf("\n%s: kmem_cache operations\n", s->name);
 381                 printf("--------------------------------------------\n");
 382                 printf(buffer);
 383         } else
 384                 printf("\n%s has no kmem_cache operations\n", s->name);
 385 }
 386
 387 const char *onoff(int x)
 388 {
 389         if (x)
 390                 return "On ";
 391         return "Off";
 392 }
 393
 394 void report(struct slabinfo *s)
 395 {
 396         if (strcmp(s->name, "*") == 0)
 397                 return;
 398
 399         printf("\nSlabcache: %-20s  Aliases: %2d Order : %2d Objects: %lu\n",
 400                 s->name, s->aliases, s->order, s->objects);
 401         if (s->hwcache_align)
 402                 printf("** Hardware cacheline aligned\n");
 403         if (s->cache_dma)
 404                 printf("** Memory is allocated in a special DMA zone\n");
 405         if (s->destroy_by_rcu)
 406                 printf("** Slabs are destroyed via RCU\n");
 407         if (s->reclaim_account)
 408                 printf("** Reclaim accounting active\n");
 409
 410         printf("\nSizes (bytes)     Slabs              Debug                Memory\n");
 411         printf("------------------------------------------------------------------------\n");
 412         printf("Object : %7d  Total  : %7ld   Sanity Checks : %s  Total: %7ld\n",
 413                         s->object_size, s->slabs, onoff(s->sanity_checks),
 414                         s->slabs * (page_size << s->order));
 415         printf("SlabObj: %7d  Full   : %7ld   Redzoning     : %s  Used : %7ld\n",
 416                         s->slab_size, s->slabs - s->partial - s->cpu_slabs,
 417                         onoff(s->red_zone), s->objects * s->object_size);
 418         printf("SlabSiz: %7d  Partial: %7ld   Poisoning     : %s  Loss : %7ld\n",
 419                         page_size << s->order, s->partial, onoff(s->poison),
 420                         s->slabs * (page_size << s->order) - s->objects * s->object_size);
 421         printf("Loss   : %7d  CpuSlab: %7d   Tracking      : %s  Lalig: %7ld\n",
 422                         s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
 423                         (s->slab_size - s->object_size) * s->objects);
 424         printf("Align  : %7d  Objects: %7d   Tracing       : %s  Lpadd: %7ld\n",
 425                         s->align, s->objs_per_slab, onoff(s->trace),
 426                         ((page_size << s->order) - s->objs_per_slab * s->slab_size) *
 427                         s->slabs);
 428
 429         ops(s);
 430         show_tracking(s);
 431         slab_numa(s, 1);
 432 }
 433
 434 void slabcache(struct slabinfo *s)
 435 {
 436         char size_str[20];
 437         char dist_str[40];
 438         char flags[20];
 439         char *p = flags;
 440
 441         if (strcmp(s->name, "*") == 0)
 442                 return;
 443
 444         if (actual_slabs == 1) {
 445                 report(s);
 446                 return;
 447         }
 448
 449         if (skip_zero && !show_empty && !s->slabs)
 450                 return;
 451
 452         if (show_empty && s->slabs)
 453                 return;
 454
 455         store_size(size_str, slab_size(s));
 456         sprintf(dist_str,"%lu/%lu/%d", s->slabs, s->partial, s->cpu_slabs);
 457
 458         if (!line++)
 459                 first_line();
 460
 461         if (s->aliases)
 462                 *p++ = '*';
 463         if (s->cache_dma)
 464                 *p++ = 'd';
 465         if (s->hwcache_align)
 466                 *p++ = 'A';
 467         if (s->poison)
 468                 *p++ = 'P';
 469         if (s->reclaim_account)
 470                 *p++ = 'a';
 471         if (s->red_zone)
 472                 *p++ = 'Z';
 473         if (s->sanity_checks)
 474                 *p++ = 'F';
 475         if (s->store_user)
 476                 *p++ = 'U';
 477         if (s->trace)
 478                 *p++ = 'T';
 479
 480         *p = 0;
 481         printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
 482                 s->name, s->objects, s->object_size, size_str, dist_str,
 483                 s->objs_per_slab, s->order,
 484                 s->slabs ? (s->partial * 100) / s->slabs : 100,
 485                 s->slabs ? (s->objects * s->object_size * 100) /
 486                         (s->slabs * (page_size << s->order)) : 100,
 487                 flags);
 488 }
 489
 490 /*
 491  * Analyze debug options. Return false if something is amiss.
 492  */
 493 int debug_opt_scan(char *opt)
 494 {
 495         if (!opt || !opt[0] || strcmp(opt, "-") == 0)
 496                 return 1;
 497
 498         if (strcasecmp(opt, "a") == 0) {
 499                 sanity = 1;
 500                 poison = 1;
 501                 redzone = 1;
 502                 tracking = 1;
 503                 return 1;
 504         }
 505
 506         for ( ; *opt; opt++)
 507                 switch (*opt) {
 508                 case 'F' : case 'f':
 509                         if (sanity)
 510                                 return 0;
 511                         sanity = 1;
 512                         break;
 513                 case 'P' : case 'p':
 514                         if (poison)
 515                                 return 0;
 516                         poison = 1;
 517                         break;
 518
 519                 case 'Z' : case 'z':
 520                         if (redzone)
 521                                 return 0;
 522                         redzone = 1;
 523                         break;
 524
 525                 case 'U' : case 'u':
 526                         if (tracking)
 527                                 return 0;
 528                         tracking = 1;
 529                         break;
 530
 531                 case 'T' : case 't':
 532                         if (tracing)
 533                                 return 0;
 534                         tracing = 1;
 535                         break;
 536                 default:
 537                         return 0;
 538                 }
 539         return 1;
 540 }
 541
 542 int slab_empty(struct slabinfo *s)
 543 {
 544         if (s->objects > 0)
 545                 return 0;
 546
 547         /*
 548          * We may still have slabs even if there are no objects. Shrinking will
 549          * remove them.
 550          */
 551         if (s->slabs != 0)
 552                 set_obj(s, "shrink", 1);
 553
 554         return 1;
 555 }
 556
 557 void slab_debug(struct slabinfo *s)
 558 {
 559         if (strcmp(s->name, "*") == 0)
 560                 return;
 561
 562         if (sanity && !s->sanity_checks) {
 563                 set_obj(s, "sanity", 1);
 564         }
 565         if (!sanity && s->sanity_checks) {
 566                 if (slab_empty(s))
 567                         set_obj(s, "sanity", 0);
 568                 else
 569                         fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
 570         }
 571         if (redzone && !s->red_zone) {
 572                 if (slab_empty(s))
 573                         set_obj(s, "red_zone", 1);
 574                 else
 575                         fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
 576         }
 577         if (!redzone && s->red_zone) {
 578                 if (slab_empty(s))
 579                         set_obj(s, "red_zone", 0);
 580                 else
 581                         fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
 582         }
 583         if (poison && !s->poison) {
 584                 if (slab_empty(s))
 585                         set_obj(s, "poison", 1);
 586                 else
 587                         fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
 588         }
 589         if (!poison && s->poison) {
 590                 if (slab_empty(s))
 591                         set_obj(s, "poison", 0);
 592                 else
 593                         fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
 594         }
 595         if (tracking && !s->store_user) {
 596                 if (slab_empty(s))
 597                         set_obj(s, "store_user", 1);
 598                 else
 599                         fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
 600         }
 601         if (!tracking && s->store_user) {
 602                 if (slab_empty(s))
 603                         set_obj(s, "store_user", 0);
 604                 else
 605                         fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
 606         }
 607         if (tracing && !s->trace) {
 608                 if (slabs == 1)
 609                         set_obj(s, "trace", 1);
 610                 else
 611                         fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
 612         }
 613         if (!tracing && s->trace)
 614                 set_obj(s, "trace", 1);
 615 }
 616
 617 void totals(void)
 618 {
 619         struct slabinfo *s;
 620
 621         int used_slabs = 0;
 622         char b1[20], b2[20], b3[20], b4[20];
 623         unsigned long long max = 1ULL << 63;
 624
 625         /* Object size */
 626         unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
 627
 628         /* Number of partial slabs in a slabcache */
 629         unsigned long long min_partial = max, max_partial = 0,
 630                                 avg_partial, total_partial = 0;
 631
 632         /* Number of slabs in a slab cache */
 633         unsigned long long min_slabs = max, max_slabs = 0,
 634                                 avg_slabs, total_slabs = 0;
 635
 636         /* Size of the whole slab */
 637         unsigned long long min_size = max, max_size = 0,
 638                                 avg_size, total_size = 0;
 639
 640         /* Bytes used for object storage in a slab */
 641         unsigned long long min_used = max, max_used = 0,
 642                                 avg_used, total_used = 0;
 643
 644         /* Waste: Bytes used for alignment and padding */
 645         unsigned long long min_waste = max, max_waste = 0,
 646                                 avg_waste, total_waste = 0;
 647         /* Number of objects in a slab */
 648         unsigned long long min_objects = max, max_objects = 0,
 649                                 avg_objects, total_objects = 0;
 650         /* Waste per object */
 651         unsigned long long min_objwaste = max,
 652                                 max_objwaste = 0, avg_objwaste,
 653                                 total_objwaste = 0;
 654
 655         /* Memory per object */
 656         unsigned long long min_memobj = max,
 657                                 max_memobj = 0, avg_memobj,
 658                                 total_objsize = 0;
 659
 660         /* Percentage of partial slabs per slab */
 661         unsigned long min_ppart = 100, max_ppart = 0,
 662                                 avg_ppart, total_ppart = 0;
 663
 664         /* Number of objects in partial slabs */
 665         unsigned long min_partobj = max, max_partobj = 0,
 666                                 avg_partobj, total_partobj = 0;
 667
 668         /* Percentage of partial objects of all objects in a slab */
 669         unsigned long min_ppartobj = 100, max_ppartobj = 0,
 670                                 avg_ppartobj, total_ppartobj = 0;
 671
 672
 673         for (s = slabinfo; s < slabinfo + slabs; s++) {
 674                 unsigned long long size;
 675                 unsigned long used;
 676                 unsigned long long wasted;
 677                 unsigned long long objwaste;
 678                 long long objects_in_partial_slabs;
 679                 unsigned long percentage_partial_slabs;
 680                 unsigned long percentage_partial_objs;
 681
 682                 if (!s->slabs || !s->objects)
 683                         continue;
 684
 685                 used_slabs++;
 686
 687                 size = slab_size(s);
 688                 used = s->objects * s->object_size;
 689                 wasted = size - used;
 690                 objwaste = s->slab_size - s->object_size;
 691
 692                 objects_in_partial_slabs = s->objects -
 693                         (s->slabs - s->partial - s ->cpu_slabs) *
 694                         s->objs_per_slab;
 695
 696                 if (objects_in_partial_slabs < 0)
 697                         objects_in_partial_slabs = 0;
 698
 699                 percentage_partial_slabs = s->partial * 100 / s->slabs;
 700                 if (percentage_partial_slabs > 100)
 701                         percentage_partial_slabs = 100;
 702
 703                 percentage_partial_objs = objects_in_partial_slabs * 100
 704                                                         / s->objects;
 705
 706                 if (percentage_partial_objs > 100)
 707                         percentage_partial_objs = 100;
 708
 709                 if (s->object_size < min_objsize)
 710                         min_objsize = s->object_size;
 711                 if (s->partial < min_partial)
 712                         min_partial = s->partial;
 713                 if (s->slabs < min_slabs)
 714                         min_slabs = s->slabs;
 715                 if (size < min_size)
 716                         min_size = size;
 717                 if (wasted < min_waste)
 718                         min_waste = wasted;
 719                 if (objwaste < min_objwaste)
 720                         min_objwaste = objwaste;
 721                 if (s->objects < min_objects)
 722                         min_objects = s->objects;
 723                 if (used < min_used)
 724                         min_used = used;
 725                 if (objects_in_partial_slabs < min_partobj)
 726                         min_partobj = objects_in_partial_slabs;
 727                 if (percentage_partial_slabs < min_ppart)
 728                         min_ppart = percentage_partial_slabs;
 729                 if (percentage_partial_objs < min_ppartobj)
 730                         min_ppartobj = percentage_partial_objs;
 731                 if (s->slab_size < min_memobj)
 732                         min_memobj = s->slab_size;
 733
 734                 if (s->object_size > max_objsize)
 735                         max_objsize = s->object_size;
 736                 if (s->partial > max_partial)
 737                         max_partial = s->partial;
 738                 if (s->slabs > max_slabs)
 739                         max_slabs = s->slabs;
 740                 if (size > max_size)
 741                         max_size = size;
 742                 if (wasted > max_waste)
 743                         max_waste = wasted;
 744                 if (objwaste > max_objwaste)
 745                         max_objwaste = objwaste;
 746                 if (s->objects > max_objects)
 747                         max_objects = s->objects;
 748                 if (used > max_used)
 749                         max_used = used;
 750                 if (objects_in_partial_slabs > max_partobj)
 751                         max_partobj = objects_in_partial_slabs;
 752                 if (percentage_partial_slabs > max_ppart)
 753                         max_ppart = percentage_partial_slabs;
 754                 if (percentage_partial_objs > max_ppartobj)
 755                         max_ppartobj = percentage_partial_objs;
 756                 if (s->slab_size > max_memobj)
 757                         max_memobj = s->slab_size;
 758
 759                 total_partial += s->partial;
 760                 total_slabs += s->slabs;
 761                 total_size += size;
 762                 total_waste += wasted;
 763
 764                 total_objects += s->objects;
 765                 total_used += used;
 766                 total_partobj += objects_in_partial_slabs;
 767                 total_ppart += percentage_partial_slabs;
 768                 total_ppartobj += percentage_partial_objs;
 769
 770                 total_objwaste += s->objects * objwaste;
 771                 total_objsize += s->objects * s->slab_size;
 772         }
 773
 774         if (!total_objects) {
 775                 printf("No objects\n");
 776                 return;
 777         }
 778         if (!used_slabs) {
 779                 printf("No slabs\n");
 780                 return;
 781         }
 782
 783         /* Per slab averages */
 784         avg_partial = total_partial / used_slabs;
 785         avg_slabs = total_slabs / used_slabs;
 786         avg_size = total_size / used_slabs;
 787         avg_waste = total_waste / used_slabs;
 788
 789         avg_objects = total_objects / used_slabs;
 790         avg_used = total_used / used_slabs;
 791         avg_partobj = total_partobj / used_slabs;
 792         avg_ppart = total_ppart / used_slabs;
 793         avg_ppartobj = total_ppartobj / used_slabs;
 794
 795         /* Per object object sizes */
 796         avg_objsize = total_used / total_objects;
 797         avg_objwaste = total_objwaste / total_objects;
 798         avg_partobj = total_partobj * 100 / total_objects;
 799         avg_memobj = total_objsize / total_objects;
 800
 801         printf("Slabcache Totals\n");
 802         printf("----------------\n");
 803         printf("Slabcaches : %3d      Aliases  : %3d->%-3d Active: %3d\n",
 804                         slabs, aliases, alias_targets, used_slabs);
 805
 806         store_size(b1, total_size);store_size(b2, total_waste);
 807         store_size(b3, total_waste * 100 / total_used);
 808         printf("Memory used: %6s   # Loss   : %6s   MRatio:%6s%%\n", b1, b2, b3);
 809
 810         store_size(b1, total_objects);store_size(b2, total_partobj);
 811         store_size(b3, total_partobj * 100 / total_objects);
 812         printf("# Objects  : %6s   # PartObj: %6s   ORatio:%6s%%\n", b1, b2, b3);
 813
 814         printf("\n");
 815         printf("Per Cache    Average         Min         Max       Total\n");
 816         printf("---------------------------------------------------------\n");
 817
 818         store_size(b1, avg_objects);store_size(b2, min_objects);
 819         store_size(b3, max_objects);store_size(b4, total_objects);
 820         printf("#Objects  %10s  %10s  %10s  %10s\n",
 821                         b1,     b2,     b3,     b4);
 822
 823         store_size(b1, avg_slabs);store_size(b2, min_slabs);
 824         store_size(b3, max_slabs);store_size(b4, total_slabs);
 825         printf("#Slabs    %10s  %10s  %10s  %10s\n",
 826                         b1,     b2,     b3,     b4);
 827
 828         store_size(b1, avg_partial);store_size(b2, min_partial);
 829         store_size(b3, max_partial);store_size(b4, total_partial);
 830         printf("#PartSlab %10s  %10s  %10s  %10s\n",
 831                         b1,     b2,     b3,     b4);
 832         store_size(b1, avg_ppart);store_size(b2, min_ppart);
 833         store_size(b3, max_ppart);
 834         store_size(b4, total_partial * 100  / total_slabs);
 835         printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n",
 836                         b1,     b2,     b3,     b4);
 837
 838         store_size(b1, avg_partobj);store_size(b2, min_partobj);
 839         store_size(b3, max_partobj);
 840         store_size(b4, total_partobj);
 841         printf("PartObjs  %10s  %10s  %10s  %10s\n",
 842                         b1,     b2,     b3,     b4);
 843
 844         store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
 845         store_size(b3, max_ppartobj);
 846         store_size(b4, total_partobj * 100 / total_objects);
 847         printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n",
 848                         b1,     b2,     b3,     b4);
 849
 850         store_size(b1, avg_size);store_size(b2, min_size);
 851         store_size(b3, max_size);store_size(b4, total_size);
 852         printf("Memory    %10s  %10s  %10s  %10s\n",
 853                         b1,     b2,     b3,     b4);
 854
 855         store_size(b1, avg_used);store_size(b2, min_used);
 856         store_size(b3, max_used);store_size(b4, total_used);
 857         printf("Used      %10s  %10s  %10s  %10s\n",
 858                         b1,     b2,     b3,     b4);
 859
 860         store_size(b1, avg_waste);store_size(b2, min_waste);
 861         store_size(b3, max_waste);store_size(b4, total_waste);
 862         printf("Loss      %10s  %10s  %10s  %10s\n",
 863                         b1,     b2,     b3,     b4);
 864
 865         printf("\n");
 866         printf("Per Object   Average         Min         Max\n");
 867         printf("---------------------------------------------\n");
 868
 869         store_size(b1, avg_memobj);store_size(b2, min_memobj);
 870         store_size(b3, max_memobj);
 871         printf("Memory    %10s  %10s  %10s\n",
 872                         b1,     b2,     b3);
 873         store_size(b1, avg_objsize);store_size(b2, min_objsize);
 874         store_size(b3, max_objsize);
 875         printf("User      %10s  %10s  %10s\n",
 876                         b1,     b2,     b3);
 877
 878         store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
 879         store_size(b3, max_objwaste);
 880         printf("Loss      %10s  %10s  %10s\n",
 881                         b1,     b2,     b3);
 882 }
 883
 884 void sort_slabs(void)
 885 {
 886         struct slabinfo *s1,*s2;
 887
 888         for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
 889                 for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
 890                         int result;
 891
 892                         if (sort_size)
 893                                 result = slab_size(s1) < slab_size(s2);
 894                         else
 895                                 result = strcasecmp(s1->name, s2->name);
 896
 897                         if (show_inverted)
 898                                 result = -result;
 899
 900                         if (result > 0) {
 901                                 struct slabinfo t;
 902
 903                                 memcpy(&t, s1, sizeof(struct slabinfo));
 904                                 memcpy(s1, s2, sizeof(struct slabinfo));
 905                                 memcpy(s2, &t, sizeof(struct slabinfo));
 906                         }
 907                 }
 908         }
 909 }
 910
 911 void sort_aliases(void)
 912 {
 913         struct aliasinfo *a1,*a2;
 914
 915         for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
 916                 for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
 917                         char *n1, *n2;
 918
 919                         n1 = a1->name;
 920                         n2 = a2->name;
 921                         if (show_alias && !show_inverted) {
 922                                 n1 = a1->ref;
 923                                 n2 = a2->ref;
 924                         }
 925                         if (strcasecmp(n1, n2) > 0) {
 926                                 struct aliasinfo t;
 927
 928                                 memcpy(&t, a1, sizeof(struct aliasinfo));
 929                                 memcpy(a1, a2, sizeof(struct aliasinfo));
 930                                 memcpy(a2, &t, sizeof(struct aliasinfo));
 931                         }
 932                 }
 933         }
 934 }
 935
 936 void link_slabs(void)
 937 {
 938         struct aliasinfo *a;
 939         struct slabinfo *s;
 940
 941         for (a = aliasinfo; a < aliasinfo + aliases; a++) {
 942
 943                 for (s = slabinfo; s < slabinfo + slabs; s++)
 944                         if (strcmp(a->ref, s->name) == 0) {
 945                                 a->slab = s;
 946                                 s->refs++;
 947                                 break;
 948                         }
 949                 if (s == slabinfo + slabs)
 950                         fatal("Unresolved alias %s\n", a->ref);
 951         }
 952 }
 953
 954 void alias(void)
 955 {
 956         struct aliasinfo *a;
 957         char *active = NULL;
 958
 959         sort_aliases();
 960         link_slabs();
 961
 962         for(a = aliasinfo; a < aliasinfo + aliases; a++) {
 963
 964                 if (!show_single_ref && a->slab->refs == 1)
 965                         continue;
 966
 967                 if (!show_inverted) {
 968                         if (active) {
 969                                 if (strcmp(a->slab->name, active) == 0) {
 970                                         printf(" %s", a->name);
 971                                         continue;
 972                                 }
 973                         }
 974                         printf("\n%-12s <- %s", a->slab->name, a->name);
 975                         active = a->slab->name;
 976                 }
 977                 else
 978                         printf("%-20s -> %s\n", a->name, a->slab->name);
 979         }
 980         if (active)
 981                 printf("\n");
 982 }
 983
 984
 985 void rename_slabs(void)
 986 {
 987         struct slabinfo *s;
 988         struct aliasinfo *a;
 989
 990         for (s = slabinfo; s < slabinfo + slabs; s++) {
 991                 if (*s->name != ':')
 992                         continue;
 993
 994                 if (s->refs > 1 && !show_first_alias)
 995                         continue;
 996
 997                 a = find_one_alias(s);
 998
 999                 if (a)
1000                         s->name = a->name;
1001                 else {
1002                         s->name = "*";
1003                         actual_slabs--;
1004                 }
1005         }
1006 }
1007
1008 int slab_mismatch(char *slab)
1009 {
1010         return regexec(&pattern, slab, 0, NULL, 0);
1011 }
1012
1013 void read_slab_dir(void)
1014 {
1015         DIR *dir;
1016         struct dirent *de;
1017         struct slabinfo *slab = slabinfo;
1018         struct aliasinfo *alias = aliasinfo;
1019         char *p;
1020         char *t;
1021         int count;
1022
1023         if (chdir("/sys/slab"))
1024                 fatal("SYSFS support for SLUB not active\n");
1025
1026         dir = opendir(".");
1027         while ((de = readdir(dir))) {
1028                 if (de->d_name[0] == '.' ||
1029                         (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1030                                 continue;
1031                 switch (de->d_type) {
1032                    case DT_LNK:
1033                         alias->name = strdup(de->d_name);
1034                         count = readlink(de->d_name, buffer, sizeof(buffer));
1035
1036                         if (count < 0)
1037                                 fatal("Cannot read symlink %s\n", de->d_name);
1038
1039                         buffer[count] = 0;
1040                         p = buffer + count;
1041                         while (p > buffer && p[-1] != '/')
1042                                 p--;
1043                         alias->ref = strdup(p);
1044                         alias++;
1045                         break;
1046                    case DT_DIR:
1047                         if (chdir(de->d_name))
1048                                 fatal("Unable to access slab %s\n", slab->name);
1049                         slab->name = strdup(de->d_name);
1050                         slab->alias = 0;
1051                         slab->refs = 0;
1052                         slab->aliases = get_obj("aliases");
1053                         slab->align = get_obj("align");
1054                         slab->cache_dma = get_obj("cache_dma");
1055                         slab->cpu_slabs = get_obj("cpu_slabs");
1056                         slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1057                         slab->hwcache_align = get_obj("hwcache_align");
1058                         slab->object_size = get_obj("object_size");
1059                         slab->objects = get_obj("objects");
1060                         slab->objs_per_slab = get_obj("objs_per_slab");
1061                         slab->order = get_obj("order");
1062                         slab->partial = get_obj("partial");
1063                         slab->partial = get_obj_and_str("partial", &t);
1064                         decode_numa_list(slab->numa_partial, t);
1065                         slab->poison = get_obj("poison");
1066                         slab->reclaim_account = get_obj("reclaim_account");
1067                         slab->red_zone = get_obj("red_zone");
1068                         slab->sanity_checks = get_obj("sanity_checks");
1069                         slab->slab_size = get_obj("slab_size");
1070                         slab->slabs = get_obj_and_str("slabs", &t);
1071                         decode_numa_list(slab->numa, t);
1072                         slab->store_user = get_obj("store_user");
1073                         slab->trace = get_obj("trace");
1074                         chdir("..");
1075                         if (slab->name[0] == ':')
1076                                 alias_targets++;
1077                         slab++;
1078                         break;
1079                    default :
1080                         fatal("Unknown file type %lx\n", de->d_type);
1081                 }
1082         }
1083         closedir(dir);
1084         slabs = slab - slabinfo;
1085         actual_slabs = slabs;
1086         aliases = alias - aliasinfo;
1087         if (slabs > MAX_SLABS)
1088                 fatal("Too many slabs\n");
1089         if (aliases > MAX_ALIASES)
1090                 fatal("Too many aliases\n");
1091 }
1092
1093 void output_slabs(void)
1094 {
1095         struct slabinfo *slab;
1096
1097         for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
1098
1099                 if (slab->alias)
1100                         continue;
1101
1102
1103                 if (show_numa)
1104                         slab_numa(slab, 0);
1105                 else if (show_track)
1106                         show_tracking(slab);
1107                 else if (validate)
1108                         slab_validate(slab);
1109                 else if (shrink)
1110                         slab_shrink(slab);
1111                 else if (set_debug)
1112                         slab_debug(slab);
1113                 else if (show_ops)
1114                         ops(slab);
1115                 else if (show_slab)
1116                         slabcache(slab);
1117                 else if (show_report)
1118                         report(slab);
1119         }
1120 }
1121
1122 struct option opts[] = {
1123         { "aliases", 0, NULL, 'a' },
1124         { "debug", 2, NULL, 'd' },
1125         { "empty", 0, NULL, 'e' },
1126         { "first-alias", 0, NULL, 'f' },
1127         { "help", 0, NULL, 'h' },
1128         { "inverted", 0, NULL, 'i'},
1129         { "numa", 0, NULL, 'n' },
1130         { "ops", 0, NULL, 'o' },
1131         { "report", 0, NULL, 'r' },
1132         { "shrink", 0, NULL, 's' },
1133         { "slabs", 0, NULL, 'l' },
1134         { "track", 0, NULL, 't'},
1135         { "validate", 0, NULL, 'v' },
1136         { "zero", 0, NULL, 'z' },
1137         { "1ref", 0, NULL, '1'},
1138         { NULL, 0, NULL, 0 }
1139 };
1140
1141 int main(int argc, char *argv[])
1142 {
1143         int c;
1144         int err;
1145         char *pattern_source;
1146
1147         page_size = getpagesize();
1148
1149         while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
1150                                                 opts, NULL)) != -1)
1151         switch(c) {
1152                 case '1':
1153                         show_single_ref = 1;
1154                         break;
1155                 case 'a':
1156                         show_alias = 1;
1157                         break;
1158                 case 'd':
1159                         set_debug = 1;
1160                         if (!debug_opt_scan(optarg))
1161                                 fatal("Invalid debug option '%s'\n", optarg);
1162                         break;
1163                 case 'e':
1164                         show_empty = 1;
1165                         break;
1166                 case 'f':
1167                         show_first_alias = 1;
1168                         break;
1169                 case 'h':
1170                         usage();
1171                         return 0;
1172                 case 'i':
1173                         show_inverted = 1;
1174                         break;
1175                 case 'n':
1176                         show_numa = 1;
1177                         break;
1178                 case 'o':
1179                         show_ops = 1;
1180                         break;
1181                 case 'r':
1182                         show_report = 1;
1183                         break;
1184                 case 's':
1185                         shrink = 1;
1186                         break;
1187                 case 'l':
1188                         show_slab = 1;
1189                         break;
1190                 case 't':
1191                         show_track = 1;
1192                         break;
1193                 case 'v':
1194                         validate = 1;
1195                         break;
1196                 case 'z':
1197                         skip_zero = 0;
1198                         break;
1199                 case 'T':
1200                         show_totals = 1;
1201                         break;
1202                 case 'S':
1203                         sort_size = 1;
1204                         break;
1205
1206                 default:
1207                         fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1208
1209         }
1210
1211         if (!show_slab && !show_alias && !show_track && !show_report
1212                 && !validate && !shrink && !set_debug && !show_ops)
1213                         show_slab = 1;
1214
1215         if (argc > optind)
1216                 pattern_source = argv[optind];
1217         else
1218                 pattern_source = ".*";
1219
1220         err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1221         if (err)
1222                 fatal("%s: Invalid pattern '%s' code %d\n",
1223                         argv[0], pattern_source, err);
1224         read_slab_dir();
1225         if (show_alias)
1226                 alias();
1227         else
1228         if (show_totals)
1229                 totals();
1230         else {
1231                 link_slabs();
1232                 rename_slabs();
1233                 sort_slabs();
1234                 output_slabs();
1235         }
1236         return 0;
1237 }