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