Documentation/vm/slabinfo.c

   1 /*
   2  * Slabinfo: Tool to get reports about slabs
   3  *
   4  * (C) 2007 sgi, Christoph Lameter <clameter@sgi.com>
   5  *
   6  * Compile by:
   7  *
   8  * gcc -o slabinfo slabinfo.c
   9  */
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <sys/types.h>
  13 #include <dirent.h>
  14 #include <strings.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <stdarg.h>
  18 #include <getopt.h>
  19 #include <regex.h>
  20 #include <errno.h>
  21
  22 #define MAX_SLABS 500
  23 #define MAX_ALIASES 500
  24 #define MAX_NODES 1024
  25
  26 struct slabinfo {
  27         char *name;
  28         int alias;
  29         int refs;
  30         int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
  31         int hwcache_align, object_size, objs_per_slab;
  32         int sanity_checks, slab_size, store_user, trace;
  33         int order, poison, reclaim_account, red_zone;
  34         unsigned long partial, objects, slabs;
  35         unsigned long alloc_fastpath, alloc_slowpath;
  36         unsigned long free_fastpath, free_slowpath;
  37         unsigned long free_frozen, free_add_partial, free_remove_partial;
  38         unsigned long alloc_from_partial, alloc_slab, free_slab, alloc_refill;
  39         unsigned long cpuslab_flush, deactivate_full, deactivate_empty;
  40         unsigned long deactivate_to_head, deactivate_to_tail;
  41         unsigned long deactivate_remote_frees;
  42         int numa[MAX_NODES];
  43         int numa_partial[MAX_NODES];
  44 } slabinfo[MAX_SLABS];
  45
  46 struct aliasinfo {
  47         char *name;
  48         char *ref;
  49         struct slabinfo *slab;
  50 } aliasinfo[MAX_ALIASES];
  51
  52 int slabs = 0;
  53 int actual_slabs = 0;
  54 int aliases = 0;
  55 int alias_targets = 0;
  56 int highest_node = 0;
  57
  58 char buffer[4096];
  59
  60 int show_empty = 0;
  61 int show_report = 0;
  62 int show_alias = 0;
  63 int show_slab = 0;
  64 int skip_zero = 1;
  65 int show_numa = 0;
  66 int show_track = 0;
  67 int show_first_alias = 0;
  68 int validate = 0;
  69 int shrink = 0;
  70 int show_inverted = 0;
  71 int show_single_ref = 0;
  72 int show_totals = 0;
  73 int sort_size = 0;
  74 int sort_active = 0;
  75 int set_debug = 0;
  76 int show_ops = 0;
  77 int show_activity = 0;
  78
  79 /* Debug options */
  80 int sanity = 0;
  81 int redzone = 0;
  82 int poison = 0;
  83 int tracking = 0;
  84 int tracing = 0;
  85
  86 int page_size;
  87
  88 regex_t pattern;
  89
  90 void fatal(const char *x, ...)
  91 {
  92         va_list ap;
  93
  94         va_start(ap, x);
  95         vfprintf(stderr, x, ap);
  96         va_end(ap);
  97         exit(EXIT_FAILURE);
  98 }
  99
 100 void usage(void)
 101 {
 102         printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\n\n"
 103                 "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
 104                 "-a|--aliases           Show aliases\n"
 105                 "-A|--activity          Most active slabs first\n"
 106                 "-d<options>|--debug=<options> Set/Clear Debug options\n"
 107                 "-D|--display-active    Switch line format to activity\n"
 108                 "-e|--empty             Show empty slabs\n"
 109                 "-f|--first-alias       Show first alias\n"
 110                 "-h|--help              Show usage information\n"
 111                 "-i|--inverted          Inverted list\n"
 112                 "-l|--slabs             Show slabs\n"
 113                 "-n|--numa              Show NUMA information\n"
 114                 "-o|--ops               Show kmem_cache_ops\n"
 115                 "-s|--shrink            Shrink slabs\n"
 116                 "-r|--report            Detailed report on single slabs\n"
 117                 "-S|--Size              Sort by size\n"
 118                 "-t|--tracking          Show alloc/free information\n"
 119                 "-T|--Totals            Show summary information\n"
 120                 "-v|--validate          Validate slabs\n"
 121                 "-z|--zero              Include empty slabs\n"
 122                 "-1|--1ref              Single reference\n"
 123                 "\nValid debug options (FZPUT may be combined)\n"
 124                 "a / A          Switch on all debug options (=FZUP)\n"
 125                 "-              Switch off all debug options\n"
 126                 "f / F          Sanity Checks (SLAB_DEBUG_FREE)\n"
 127                 "z / Z          Redzoning\n"
 128                 "p / P          Poisoning\n"
 129                 "u / U          Tracking\n"
 130                 "t / T          Tracing\n"
 131         );
 132 }
 133
 134 unsigned long read_obj(const char *name)
 135 {
 136         FILE *f = fopen(name, "r");
 137
 138         if (!f)
 139                 buffer[0] = 0;
 140         else {
 141                 if (!fgets(buffer, sizeof(buffer), f))
 142                         buffer[0] = 0;
 143                 fclose(f);
 144                 if (buffer[strlen(buffer)] == '\n')
 145                         buffer[strlen(buffer)] = 0;
 146         }
 147         return strlen(buffer);
 148 }
 149
 150
 151 /*
 152  * Get the contents of an attribute
 153  */
 154 unsigned long get_obj(const char *name)
 155 {
 156         if (!read_obj(name))
 157                 return 0;
 158
 159         return atol(buffer);
 160 }
 161
 162 unsigned long get_obj_and_str(const char *name, char **x)
 163 {
 164         unsigned long result = 0;
 165         char *p;
 166
 167         *x = NULL;
 168
 169         if (!read_obj(name)) {
 170                 x = NULL;
 171                 return 0;
 172         }
 173         result = strtoul(buffer, &p, 10);
 174         while (*p == ' ')
 175                 p++;
 176         if (*p)
 177                 *x = strdup(p);
 178         return result;
 179 }
 180
 181 void set_obj(struct slabinfo *s, const char *name, int n)
 182 {
 183         char x[100];
 184         FILE *f;
 185
 186         snprintf(x, 100, "%s/%s", s->name, name);
 187         f = fopen(x, "w");
 188         if (!f)
 189                 fatal("Cannot write to %s\n", x);
 190
 191         fprintf(f, "%d\n", n);
 192         fclose(f);
 193 }
 194
 195 unsigned long read_slab_obj(struct slabinfo *s, const char *name)
 196 {
 197         char x[100];
 198         FILE *f;
 199         size_t l;
 200
 201         snprintf(x, 100, "%s/%s", s->name, name);
 202         f = fopen(x, "r");
 203         if (!f) {
 204                 buffer[0] = 0;
 205                 l = 0;
 206         } else {
 207                 l = fread(buffer, 1, sizeof(buffer), f);
 208                 buffer[l] = 0;
 209                 fclose(f);
 210         }
 211         return l;
 212 }
 213
 214
 215 /*
 216  * Put a size string together
 217  */
 218 int store_size(char *buffer, unsigned long value)
 219 {
 220         unsigned long divisor = 1;
 221         char trailer = 0;
 222         int n;
 223
 224         if (value > 1000000000UL) {
 225                 divisor = 100000000UL;
 226                 trailer = 'G';
 227         } else if (value > 1000000UL) {
 228                 divisor = 100000UL;
 229                 trailer = 'M';
 230         } else if (value > 1000UL) {
 231                 divisor = 100;
 232                 trailer = 'K';
 233         }
 234
 235         value /= divisor;
 236         n = sprintf(buffer, "%ld",value);
 237         if (trailer) {
 238                 buffer[n] = trailer;
 239                 n++;
 240                 buffer[n] = 0;
 241         }
 242         if (divisor != 1) {
 243                 memmove(buffer + n - 2, buffer + n - 3, 4);
 244                 buffer[n-2] = '.';
 245                 n++;
 246         }
 247         return n;
 248 }
 249
 250 void decode_numa_list(int *numa, char *t)
 251 {
 252         int node;
 253         int nr;
 254
 255         memset(numa, 0, MAX_NODES * sizeof(int));
 256
 257         if (!t)
 258                 return;
 259
 260         while (*t == 'N') {
 261                 t++;
 262                 node = strtoul(t, &t, 10);
 263                 if (*t == '=') {
 264                         t++;
 265                         nr = strtoul(t, &t, 10);
 266                         numa[node] = nr;
 267                         if (node > highest_node)
 268                                 highest_node = node;
 269                 }
 270                 while (*t == ' ')
 271                         t++;
 272         }
 273 }
 274
 275 void slab_validate(struct slabinfo *s)
 276 {
 277         if (strcmp(s->name, "*") == 0)
 278                 return;
 279
 280         set_obj(s, "validate", 1);
 281 }
 282
 283 void slab_shrink(struct slabinfo *s)
 284 {
 285         if (strcmp(s->name, "*") == 0)
 286                 return;
 287
 288         set_obj(s, "shrink", 1);
 289 }
 290
 291 int line = 0;
 292
 293 void first_line(void)
 294 {
 295         if (show_activity)
 296                 printf("Name                   Objects    Alloc     Free   %%Fast\n");
 297         else
 298                 printf("Name                   Objects Objsize    Space "
 299                         "Slabs/Part/Cpu  O/S O %%Fr %%Ef Flg\n");
 300 }
 301
 302 /*
 303  * Find the shortest alias of a slab
 304  */
 305 struct aliasinfo *find_one_alias(struct slabinfo *find)
 306 {
 307         struct aliasinfo *a;
 308         struct aliasinfo *best = NULL;
 309
 310         for(a = aliasinfo;a < aliasinfo + aliases; a++) {
 311                 if (a->slab == find &&
 312                         (!best || strlen(best->name) < strlen(a->name))) {
 313                                 best = a;
 314                                 if (strncmp(a->name,"kmall", 5) == 0)
 315                                         return best;
 316                         }
 317         }
 318         return best;
 319 }
 320
 321 unsigned long slab_size(struct slabinfo *s)
 322 {
 323         return  s->slabs * (page_size << s->order);
 324 }
 325
 326 unsigned long slab_activity(struct slabinfo *s)
 327 {
 328         return  s->alloc_fastpath + s->free_fastpath +
 329                 s->alloc_slowpath + s->free_slowpath;
 330 }
 331
 332 void slab_numa(struct slabinfo *s, int mode)
 333 {
 334         int node;
 335
 336         if (strcmp(s->name, "*") == 0)
 337                 return;
 338
 339         if (!highest_node) {
 340                 printf("\n%s: No NUMA information available.\n", s->name);
 341                 return;
 342         }
 343
 344         if (skip_zero && !s->slabs)
 345                 return;
 346
 347         if (!line) {
 348                 printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
 349                 for(node = 0; node <= highest_node; node++)
 350                         printf(" %4d", node);
 351                 printf("\n----------------------");
 352                 for(node = 0; node <= highest_node; node++)
 353                         printf("-----");
 354                 printf("\n");
 355         }
 356         printf("%-21s ", mode ? "All slabs" : s->name);
 357         for(node = 0; node <= highest_node; node++) {
 358                 char b[20];
 359
 360                 store_size(b, s->numa[node]);
 361                 printf(" %4s", b);
 362         }
 363         printf("\n");
 364         if (mode) {
 365                 printf("%-21s ", "Partial slabs");
 366                 for(node = 0; node <= highest_node; node++) {
 367                         char b[20];
 368
 369                         store_size(b, s->numa_partial[node]);
 370                         printf(" %4s", b);
 371                 }
 372                 printf("\n");
 373         }
 374         line++;
 375 }
 376
 377 void show_tracking(struct slabinfo *s)
 378 {
 379         printf("\n%s: Kernel object allocation\n", s->name);
 380         printf("-----------------------------------------------------------------------\n");
 381         if (read_slab_obj(s, "alloc_calls"))
 382                 printf(buffer);
 383         else
 384                 printf("No Data\n");
 385
 386         printf("\n%s: Kernel object freeing\n", s->name);
 387         printf("------------------------------------------------------------------------\n");
 388         if (read_slab_obj(s, "free_calls"))
 389                 printf(buffer);
 390         else
 391                 printf("No Data\n");
 392
 393 }
 394
 395 void ops(struct slabinfo *s)
 396 {
 397         if (strcmp(s->name, "*") == 0)
 398                 return;
 399
 400         if (read_slab_obj(s, "ops")) {
 401                 printf("\n%s: kmem_cache operations\n", s->name);
 402                 printf("--------------------------------------------\n");
 403                 printf(buffer);
 404         } else
 405                 printf("\n%s has no kmem_cache operations\n", s->name);
 406 }
 407
 408 const char *onoff(int x)
 409 {
 410         if (x)
 411                 return "On ";
 412         return "Off";
 413 }
 414
 415 void slab_stats(struct slabinfo *s)
 416 {
 417         unsigned long total_alloc;
 418         unsigned long total_free;
 419         unsigned long total;
 420
 421         if (!s->alloc_slab)
 422                 return;
 423
 424         total_alloc = s->alloc_fastpath + s->alloc_slowpath;
 425         total_free = s->free_fastpath + s->free_slowpath;
 426
 427         if (!total_alloc)
 428                 return;
 429
 430         printf("\n");
 431         printf("Slab Perf Counter       Alloc     Free %%Al %%Fr\n");
 432         printf("--------------------------------------------------\n");
 433         printf("Fastpath             %8lu %8lu %3lu %3lu\n",
 434                 s->alloc_fastpath, s->free_fastpath,
 435                 s->alloc_fastpath * 100 / total_alloc,
 436                 s->free_fastpath * 100 / total_free);
 437         printf("Slowpath             %8lu %8lu %3lu %3lu\n",
 438                 total_alloc - s->alloc_fastpath, s->free_slowpath,
 439                 (total_alloc - s->alloc_fastpath) * 100 / total_alloc,
 440                 s->free_slowpath * 100 / total_free);
 441         printf("Page Alloc           %8lu %8lu %3lu %3lu\n",
 442                 s->alloc_slab, s->free_slab,
 443                 s->alloc_slab * 100 / total_alloc,
 444                 s->free_slab * 100 / total_free);
 445         printf("Add partial          %8lu %8lu %3lu %3lu\n",
 446                 s->deactivate_to_head + s->deactivate_to_tail,
 447                 s->free_add_partial,
 448                 (s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
 449                 s->free_add_partial * 100 / total_free);
 450         printf("Remove partial       %8lu %8lu %3lu %3lu\n",
 451                 s->alloc_from_partial, s->free_remove_partial,
 452                 s->alloc_from_partial * 100 / total_alloc,
 453                 s->free_remove_partial * 100 / total_free);
 454
 455         printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
 456                 s->deactivate_remote_frees, s->free_frozen,
 457                 s->deactivate_remote_frees * 100 / total_alloc,
 458                 s->free_frozen * 100 / total_free);
 459
 460         printf("Total                %8lu %8lu\n\n", total_alloc, total_free);
 461
 462         if (s->cpuslab_flush)
 463                 printf("Flushes %8lu\n", s->cpuslab_flush);
 464
 465         if (s->alloc_refill)
 466                 printf("Refill %8lu\n", s->alloc_refill);
 467
 468         total = s->deactivate_full + s->deactivate_empty +
 469                         s->deactivate_to_head + s->deactivate_to_tail;
 470
 471         if (total)
 472                 printf("Deactivate Full=%lu(%lu%%) Empty=%lu(%lu%%) "
 473                         "ToHead=%lu(%lu%%) ToTail=%lu(%lu%%)\n",
 474                         s->deactivate_full, (s->deactivate_full * 100) / total,
 475                         s->deactivate_empty, (s->deactivate_empty * 100) / total,
 476                         s->deactivate_to_head, (s->deactivate_to_head * 100) / total,
 477                         s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
 478 }
 479
 480 void report(struct slabinfo *s)
 481 {
 482         if (strcmp(s->name, "*") == 0)
 483                 return;
 484
 485         printf("\nSlabcache: %-20s  Aliases: %2d Order : %2d Objects: %lu\n",
 486                 s->name, s->aliases, s->order, s->objects);
 487         if (s->hwcache_align)
 488                 printf("** Hardware cacheline aligned\n");
 489         if (s->cache_dma)
 490                 printf("** Memory is allocated in a special DMA zone\n");
 491         if (s->destroy_by_rcu)
 492                 printf("** Slabs are destroyed via RCU\n");
 493         if (s->reclaim_account)
 494                 printf("** Reclaim accounting active\n");
 495
 496         printf("\nSizes (bytes)     Slabs              Debug                Memory\n");
 497         printf("------------------------------------------------------------------------\n");
 498         printf("Object : %7d  Total  : %7ld   Sanity Checks : %s  Total: %7ld\n",
 499                         s->object_size, s->slabs, onoff(s->sanity_checks),
 500                         s->slabs * (page_size << s->order));
 501         printf("SlabObj: %7d  Full   : %7ld   Redzoning     : %s  Used : %7ld\n",
 502                         s->slab_size, s->slabs - s->partial - s->cpu_slabs,
 503                         onoff(s->red_zone), s->objects * s->object_size);
 504         printf("SlabSiz: %7d  Partial: %7ld   Poisoning     : %s  Loss : %7ld\n",
 505                         page_size << s->order, s->partial, onoff(s->poison),
 506                         s->slabs * (page_size << s->order) - s->objects * s->object_size);
 507         printf("Loss   : %7d  CpuSlab: %7d   Tracking      : %s  Lalig: %7ld\n",
 508                         s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
 509                         (s->slab_size - s->object_size) * s->objects);
 510         printf("Align  : %7d  Objects: %7d   Tracing       : %s  Lpadd: %7ld\n",
 511                         s->align, s->objs_per_slab, onoff(s->trace),
 512                         ((page_size << s->order) - s->objs_per_slab * s->slab_size) *
 513                         s->slabs);
 514
 515         ops(s);
 516         show_tracking(s);
 517         slab_numa(s, 1);
 518         slab_stats(s);
 519 }
 520
 521 void slabcache(struct slabinfo *s)
 522 {
 523         char size_str[20];
 524         char dist_str[40];
 525         char flags[20];
 526         char *p = flags;
 527
 528         if (strcmp(s->name, "*") == 0)
 529                 return;
 530
 531         if (actual_slabs == 1) {
 532                 report(s);
 533                 return;
 534         }
 535
 536         if (skip_zero && !show_empty && !s->slabs)
 537                 return;
 538
 539         if (show_empty && s->slabs)
 540                 return;
 541
 542         store_size(size_str, slab_size(s));
 543         snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs, s->partial, s->cpu_slabs);
 544
 545         if (!line++)
 546                 first_line();
 547
 548         if (s->aliases)
 549                 *p++ = '*';
 550         if (s->cache_dma)
 551                 *p++ = 'd';
 552         if (s->hwcache_align)
 553                 *p++ = 'A';
 554         if (s->poison)
 555                 *p++ = 'P';
 556         if (s->reclaim_account)
 557                 *p++ = 'a';
 558         if (s->red_zone)
 559                 *p++ = 'Z';
 560         if (s->sanity_checks)
 561                 *p++ = 'F';
 562         if (s->store_user)
 563                 *p++ = 'U';
 564         if (s->trace)
 565                 *p++ = 'T';
 566
 567         *p = 0;
 568         if (show_activity) {
 569                 unsigned long total_alloc;
 570                 unsigned long total_free;
 571
 572                 total_alloc = s->alloc_fastpath + s->alloc_slowpath;
 573                 total_free = s->free_fastpath + s->free_slowpath;
 574
 575                 printf("%-21s %8ld %8ld %8ld %3ld %3ld \n",
 576                         s->name, s->objects,
 577                         total_alloc, total_free,
 578                         total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
 579                         total_free ? (s->free_fastpath * 100 / total_free) : 0);
 580         }
 581         else
 582                 printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
 583                         s->name, s->objects, s->object_size, size_str, dist_str,
 584                         s->objs_per_slab, s->order,
 585                         s->slabs ? (s->partial * 100) / s->slabs : 100,
 586                         s->slabs ? (s->objects * s->object_size * 100) /
 587                                 (s->slabs * (page_size << s->order)) : 100,
 588                         flags);
 589 }
 590
 591 /*
 592  * Analyze debug options. Return false if something is amiss.
 593  */
 594 int debug_opt_scan(char *opt)
 595 {
 596         if (!opt || !opt[0] || strcmp(opt, "-") == 0)
 597                 return 1;
 598
 599         if (strcasecmp(opt, "a") == 0) {
 600                 sanity = 1;
 601                 poison = 1;
 602                 redzone = 1;
 603                 tracking = 1;
 604                 return 1;
 605         }
 606
 607         for ( ; *opt; opt++)
 608                 switch (*opt) {
 609                 case 'F' : case 'f':
 610                         if (sanity)
 611                                 return 0;
 612                         sanity = 1;
 613                         break;
 614                 case 'P' : case 'p':
 615                         if (poison)
 616                                 return 0;
 617                         poison = 1;
 618                         break;
 619
 620                 case 'Z' : case 'z':
 621                         if (redzone)
 622                                 return 0;
 623                         redzone = 1;
 624                         break;
 625
 626                 case 'U' : case 'u':
 627                         if (tracking)
 628                                 return 0;
 629                         tracking = 1;
 630                         break;
 631
 632                 case 'T' : case 't':
 633                         if (tracing)
 634                                 return 0;
 635                         tracing = 1;
 636                         break;
 637                 default:
 638                         return 0;
 639                 }
 640         return 1;
 641 }
 642
 643 int slab_empty(struct slabinfo *s)
 644 {
 645         if (s->objects > 0)
 646                 return 0;
 647
 648         /*
 649          * We may still have slabs even if there are no objects. Shrinking will
 650          * remove them.
 651          */
 652         if (s->slabs != 0)
 653                 set_obj(s, "shrink", 1);
 654
 655         return 1;
 656 }
 657
 658 void slab_debug(struct slabinfo *s)
 659 {
 660         if (strcmp(s->name, "*") == 0)
 661                 return;
 662
 663         if (sanity && !s->sanity_checks) {
 664                 set_obj(s, "sanity", 1);
 665         }
 666         if (!sanity && s->sanity_checks) {
 667                 if (slab_empty(s))
 668                         set_obj(s, "sanity", 0);
 669                 else
 670                         fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
 671         }
 672         if (redzone && !s->red_zone) {
 673                 if (slab_empty(s))
 674                         set_obj(s, "red_zone", 1);
 675                 else
 676                         fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
 677         }
 678         if (!redzone && s->red_zone) {
 679                 if (slab_empty(s))
 680                         set_obj(s, "red_zone", 0);
 681                 else
 682                         fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
 683         }
 684         if (poison && !s->poison) {
 685                 if (slab_empty(s))
 686                         set_obj(s, "poison", 1);
 687                 else
 688                         fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
 689         }
 690         if (!poison && s->poison) {
 691                 if (slab_empty(s))
 692                         set_obj(s, "poison", 0);
 693                 else
 694                         fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
 695         }
 696         if (tracking && !s->store_user) {
 697                 if (slab_empty(s))
 698                         set_obj(s, "store_user", 1);
 699                 else
 700                         fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
 701         }
 702         if (!tracking && s->store_user) {
 703                 if (slab_empty(s))
 704                         set_obj(s, "store_user", 0);
 705                 else
 706                         fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
 707         }
 708         if (tracing && !s->trace) {
 709                 if (slabs == 1)
 710                         set_obj(s, "trace", 1);
 711                 else
 712                         fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
 713         }
 714         if (!tracing && s->trace)
 715                 set_obj(s, "trace", 1);
 716 }
 717
 718 void totals(void)
 719 {
 720         struct slabinfo *s;
 721
 722         int used_slabs = 0;
 723         char b1[20], b2[20], b3[20], b4[20];
 724         unsigned long long max = 1ULL << 63;
 725
 726         /* Object size */
 727         unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
 728
 729         /* Number of partial slabs in a slabcache */
 730         unsigned long long min_partial = max, max_partial = 0,
 731                                 avg_partial, total_partial = 0;
 732
 733         /* Number of slabs in a slab cache */
 734         unsigned long long min_slabs = max, max_slabs = 0,
 735                                 avg_slabs, total_slabs = 0;
 736
 737         /* Size of the whole slab */
 738         unsigned long long min_size = max, max_size = 0,
 739                                 avg_size, total_size = 0;
 740
 741         /* Bytes used for object storage in a slab */
 742         unsigned long long min_used = max, max_used = 0,
 743                                 avg_used, total_used = 0;
 744
 745         /* Waste: Bytes used for alignment and padding */
 746         unsigned long long min_waste = max, max_waste = 0,
 747                                 avg_waste, total_waste = 0;
 748         /* Number of objects in a slab */
 749         unsigned long long min_objects = max, max_objects = 0,
 750                                 avg_objects, total_objects = 0;
 751         /* Waste per object */
 752         unsigned long long min_objwaste = max,
 753                                 max_objwaste = 0, avg_objwaste,
 754                                 total_objwaste = 0;
 755
 756         /* Memory per object */
 757         unsigned long long min_memobj = max,
 758                                 max_memobj = 0, avg_memobj,
 759                                 total_objsize = 0;
 760
 761         /* Percentage of partial slabs per slab */
 762         unsigned long min_ppart = 100, max_ppart = 0,
 763                                 avg_ppart, total_ppart = 0;
 764
 765         /* Number of objects in partial slabs */
 766         unsigned long min_partobj = max, max_partobj = 0,
 767                                 avg_partobj, total_partobj = 0;
 768
 769         /* Percentage of partial objects of all objects in a slab */
 770         unsigned long min_ppartobj = 100, max_ppartobj = 0,
 771                                 avg_ppartobj, total_ppartobj = 0;
 772
 773
 774         for (s = slabinfo; s < slabinfo + slabs; s++) {
 775                 unsigned long long size;
 776                 unsigned long used;
 777                 unsigned long long wasted;
 778                 unsigned long long objwaste;
 779                 long long objects_in_partial_slabs;
 780                 unsigned long percentage_partial_slabs;
 781                 unsigned long percentage_partial_objs;
 782
 783                 if (!s->slabs || !s->objects)
 784                         continue;
 785
 786                 used_slabs++;
 787
 788                 size = slab_size(s);
 789                 used = s->objects * s->object_size;
 790                 wasted = size - used;
 791                 objwaste = s->slab_size - s->object_size;
 792
 793                 objects_in_partial_slabs = s->objects -
 794                         (s->slabs - s->partial - s ->cpu_slabs) *
 795                         s->objs_per_slab;
 796
 797                 if (objects_in_partial_slabs < 0)
 798                         objects_in_partial_slabs = 0;
 799
 800                 percentage_partial_slabs = s->partial * 100 / s->slabs;
 801                 if (percentage_partial_slabs > 100)
 802                         percentage_partial_slabs = 100;
 803
 804                 percentage_partial_objs = objects_in_partial_slabs * 100
 805                                                         / s->objects;
 806
 807                 if (percentage_partial_objs > 100)
 808                         percentage_partial_objs = 100;
 809
 810                 if (s->object_size < min_objsize)
 811                         min_objsize = s->object_size;
 812                 if (s->partial < min_partial)
 813                         min_partial = s->partial;
 814                 if (s->slabs < min_slabs)
 815                         min_slabs = s->slabs;
 816                 if (size < min_size)
 817                         min_size = size;
 818                 if (wasted < min_waste)
 819                         min_waste = wasted;
 820                 if (objwaste < min_objwaste)
 821                         min_objwaste = objwaste;
 822                 if (s->objects < min_objects)
 823                         min_objects = s->objects;
 824                 if (used < min_used)
 825                         min_used = used;
 826                 if (objects_in_partial_slabs < min_partobj)
 827                         min_partobj = objects_in_partial_slabs;
 828                 if (percentage_partial_slabs < min_ppart)
 829                         min_ppart = percentage_partial_slabs;
 830                 if (percentage_partial_objs < min_ppartobj)
 831                         min_ppartobj = percentage_partial_objs;
 832                 if (s->slab_size < min_memobj)
 833                         min_memobj = s->slab_size;
 834
 835                 if (s->object_size > max_objsize)
 836                         max_objsize = s->object_size;
 837                 if (s->partial > max_partial)
 838                         max_partial = s->partial;
 839                 if (s->slabs > max_slabs)
 840                         max_slabs = s->slabs;
 841                 if (size > max_size)
 842                         max_size = size;
 843                 if (wasted > max_waste)
 844                         max_waste = wasted;
 845                 if (objwaste > max_objwaste)
 846                         max_objwaste = objwaste;
 847                 if (s->objects > max_objects)
 848                         max_objects = s->objects;
 849                 if (used > max_used)
 850                         max_used = used;
 851                 if (objects_in_partial_slabs > max_partobj)
 852                         max_partobj = objects_in_partial_slabs;
 853                 if (percentage_partial_slabs > max_ppart)
 854                         max_ppart = percentage_partial_slabs;
 855                 if (percentage_partial_objs > max_ppartobj)
 856                         max_ppartobj = percentage_partial_objs;
 857                 if (s->slab_size > max_memobj)
 858                         max_memobj = s->slab_size;
 859
 860                 total_partial += s->partial;
 861                 total_slabs += s->slabs;
 862                 total_size += size;
 863                 total_waste += wasted;
 864
 865                 total_objects += s->objects;
 866                 total_used += used;
 867                 total_partobj += objects_in_partial_slabs;
 868                 total_ppart += percentage_partial_slabs;
 869                 total_ppartobj += percentage_partial_objs;
 870
 871                 total_objwaste += s->objects * objwaste;
 872                 total_objsize += s->objects * s->slab_size;
 873         }
 874
 875         if (!total_objects) {
 876                 printf("No objects\n");
 877                 return;
 878         }
 879         if (!used_slabs) {
 880                 printf("No slabs\n");
 881                 return;
 882         }
 883
 884         /* Per slab averages */
 885         avg_partial = total_partial / used_slabs;
 886         avg_slabs = total_slabs / used_slabs;
 887         avg_size = total_size / used_slabs;
 888         avg_waste = total_waste / used_slabs;
 889
 890         avg_objects = total_objects / used_slabs;
 891         avg_used = total_used / used_slabs;
 892         avg_partobj = total_partobj / used_slabs;
 893         avg_ppart = total_ppart / used_slabs;
 894         avg_ppartobj = total_ppartobj / used_slabs;
 895
 896         /* Per object object sizes */
 897         avg_objsize = total_used / total_objects;
 898         avg_objwaste = total_objwaste / total_objects;
 899         avg_partobj = total_partobj * 100 / total_objects;
 900         avg_memobj = total_objsize / total_objects;
 901
 902         printf("Slabcache Totals\n");
 903         printf("----------------\n");
 904         printf("Slabcaches : %3d      Aliases  : %3d->%-3d Active: %3d\n",
 905                         slabs, aliases, alias_targets, used_slabs);
 906
 907         store_size(b1, total_size);store_size(b2, total_waste);
 908         store_size(b3, total_waste * 100 / total_used);
 909         printf("Memory used: %6s   # Loss   : %6s   MRatio:%6s%%\n", b1, b2, b3);
 910
 911         store_size(b1, total_objects);store_size(b2, total_partobj);
 912         store_size(b3, total_partobj * 100 / total_objects);
 913         printf("# Objects  : %6s   # PartObj: %6s   ORatio:%6s%%\n", b1, b2, b3);
 914
 915         printf("\n");
 916         printf("Per Cache    Average         Min         Max       Total\n");
 917         printf("---------------------------------------------------------\n");
 918
 919         store_size(b1, avg_objects);store_size(b2, min_objects);
 920         store_size(b3, max_objects);store_size(b4, total_objects);
 921         printf("#Objects  %10s  %10s  %10s  %10s\n",
 922                         b1,     b2,     b3,     b4);
 923
 924         store_size(b1, avg_slabs);store_size(b2, min_slabs);
 925         store_size(b3, max_slabs);store_size(b4, total_slabs);
 926         printf("#Slabs    %10s  %10s  %10s  %10s\n",
 927                         b1,     b2,     b3,     b4);
 928
 929         store_size(b1, avg_partial);store_size(b2, min_partial);
 930         store_size(b3, max_partial);store_size(b4, total_partial);
 931         printf("#PartSlab %10s  %10s  %10s  %10s\n",
 932                         b1,     b2,     b3,     b4);
 933         store_size(b1, avg_ppart);store_size(b2, min_ppart);
 934         store_size(b3, max_ppart);
 935         store_size(b4, total_partial * 100  / total_slabs);
 936         printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n",
 937                         b1,     b2,     b3,     b4);
 938
 939         store_size(b1, avg_partobj);store_size(b2, min_partobj);
 940         store_size(b3, max_partobj);
 941         store_size(b4, total_partobj);
 942         printf("PartObjs  %10s  %10s  %10s  %10s\n",
 943                         b1,     b2,     b3,     b4);
 944
 945         store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
 946         store_size(b3, max_ppartobj);
 947         store_size(b4, total_partobj * 100 / total_objects);
 948         printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n",
 949                         b1,     b2,     b3,     b4);
 950
 951         store_size(b1, avg_size);store_size(b2, min_size);
 952         store_size(b3, max_size);store_size(b4, total_size);
 953         printf("Memory    %10s  %10s  %10s  %10s\n",
 954                         b1,     b2,     b3,     b4);
 955
 956         store_size(b1, avg_used);store_size(b2, min_used);
 957         store_size(b3, max_used);store_size(b4, total_used);
 958         printf("Used      %10s  %10s  %10s  %10s\n",
 959                         b1,     b2,     b3,     b4);
 960
 961         store_size(b1, avg_waste);store_size(b2, min_waste);
 962         store_size(b3, max_waste);store_size(b4, total_waste);
 963         printf("Loss      %10s  %10s  %10s  %10s\n",
 964                         b1,     b2,     b3,     b4);
 965
 966         printf("\n");
 967         printf("Per Object   Average         Min         Max\n");
 968         printf("---------------------------------------------\n");
 969
 970         store_size(b1, avg_memobj);store_size(b2, min_memobj);
 971         store_size(b3, max_memobj);
 972         printf("Memory    %10s  %10s  %10s\n",
 973                         b1,     b2,     b3);
 974         store_size(b1, avg_objsize);store_size(b2, min_objsize);
 975         store_size(b3, max_objsize);
 976         printf("User      %10s  %10s  %10s\n",
 977                         b1,     b2,     b3);
 978
 979         store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
 980         store_size(b3, max_objwaste);
 981         printf("Loss      %10s  %10s  %10s\n",
 982                         b1,     b2,     b3);
 983 }
 984
 985 void sort_slabs(void)
 986 {
 987         struct slabinfo *s1,*s2;
 988
 989         for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
 990                 for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
 991                         int result;
 992
 993                         if (sort_size)
 994                                 result = slab_size(s1) < slab_size(s2);
 995                         else if (sort_active)
 996                                 result = slab_activity(s1) < slab_activity(s2);
 997                         else
 998                                 result = strcasecmp(s1->name, s2->name);
 999
1000                         if (show_inverted)
1001                                 result = -result;
1002
1003                         if (result > 0) {
1004                                 struct slabinfo t;
1005
1006                                 memcpy(&t, s1, sizeof(struct slabinfo));
1007                                 memcpy(s1, s2, sizeof(struct slabinfo));
1008                                 memcpy(s2, &t, sizeof(struct slabinfo));
1009                         }
1010                 }
1011         }
1012 }
1013
1014 void sort_aliases(void)
1015 {
1016         struct aliasinfo *a1,*a2;
1017
1018         for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
1019                 for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
1020                         char *n1, *n2;
1021
1022                         n1 = a1->name;
1023                         n2 = a2->name;
1024                         if (show_alias && !show_inverted) {
1025                                 n1 = a1->ref;
1026                                 n2 = a2->ref;
1027                         }
1028                         if (strcasecmp(n1, n2) > 0) {
1029                                 struct aliasinfo t;
1030
1031                                 memcpy(&t, a1, sizeof(struct aliasinfo));
1032                                 memcpy(a1, a2, sizeof(struct aliasinfo));
1033                                 memcpy(a2, &t, sizeof(struct aliasinfo));
1034                         }
1035                 }
1036         }
1037 }
1038
1039 void link_slabs(void)
1040 {
1041         struct aliasinfo *a;
1042         struct slabinfo *s;
1043
1044         for (a = aliasinfo; a < aliasinfo + aliases; a++) {
1045
1046                 for (s = slabinfo; s < slabinfo + slabs; s++)
1047                         if (strcmp(a->ref, s->name) == 0) {
1048                                 a->slab = s;
1049                                 s->refs++;
1050                                 break;
1051                         }
1052                 if (s == slabinfo + slabs)
1053                         fatal("Unresolved alias %s\n", a->ref);
1054         }
1055 }
1056
1057 void alias(void)
1058 {
1059         struct aliasinfo *a;
1060         char *active = NULL;
1061
1062         sort_aliases();
1063         link_slabs();
1064
1065         for(a = aliasinfo; a < aliasinfo + aliases; a++) {
1066
1067                 if (!show_single_ref && a->slab->refs == 1)
1068                         continue;
1069
1070                 if (!show_inverted) {
1071                         if (active) {
1072                                 if (strcmp(a->slab->name, active) == 0) {
1073                                         printf(" %s", a->name);
1074                                         continue;
1075                                 }
1076                         }
1077                         printf("\n%-12s <- %s", a->slab->name, a->name);
1078                         active = a->slab->name;
1079                 }
1080                 else
1081                         printf("%-20s -> %s\n", a->name, a->slab->name);
1082         }
1083         if (active)
1084                 printf("\n");
1085 }
1086
1087
1088 void rename_slabs(void)
1089 {
1090         struct slabinfo *s;
1091         struct aliasinfo *a;
1092
1093         for (s = slabinfo; s < slabinfo + slabs; s++) {
1094                 if (*s->name != ':')
1095                         continue;
1096
1097                 if (s->refs > 1 && !show_first_alias)
1098                         continue;
1099
1100                 a = find_one_alias(s);
1101
1102                 if (a)
1103                         s->name = a->name;
1104                 else {
1105                         s->name = "*";
1106                         actual_slabs--;
1107                 }
1108         }
1109 }
1110
1111 int slab_mismatch(char *slab)
1112 {
1113         return regexec(&pattern, slab, 0, NULL, 0);
1114 }
1115
1116 void read_slab_dir(void)
1117 {
1118         DIR *dir;
1119         struct dirent *de;
1120         struct slabinfo *slab = slabinfo;
1121         struct aliasinfo *alias = aliasinfo;
1122         char *p;
1123         char *t;
1124         int count;
1125
1126         if (chdir("/sys/kernel/slab"))
1127                 fatal("SYSFS support for SLUB not active\n");
1128
1129         dir = opendir(".");
1130         while ((de = readdir(dir))) {
1131                 if (de->d_name[0] == '.' ||
1132                         (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1133                                 continue;
1134                 switch (de->d_type) {
1135                    case DT_LNK:
1136                         alias->name = strdup(de->d_name);
1137                         count = readlink(de->d_name, buffer, sizeof(buffer));
1138
1139                         if (count < 0)
1140                                 fatal("Cannot read symlink %s\n", de->d_name);
1141
1142                         buffer[count] = 0;
1143                         p = buffer + count;
1144                         while (p > buffer && p[-1] != '/')
1145                                 p--;
1146                         alias->ref = strdup(p);
1147                         alias++;
1148                         break;
1149                    case DT_DIR:
1150                         if (chdir(de->d_name))
1151                                 fatal("Unable to access slab %s\n", slab->name);
1152                         slab->name = strdup(de->d_name);
1153                         slab->alias = 0;
1154                         slab->refs = 0;
1155                         slab->aliases = get_obj("aliases");
1156                         slab->align = get_obj("align");
1157                         slab->cache_dma = get_obj("cache_dma");
1158                         slab->cpu_slabs = get_obj("cpu_slabs");
1159                         slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1160                         slab->hwcache_align = get_obj("hwcache_align");
1161                         slab->object_size = get_obj("object_size");
1162                         slab->objects = get_obj("objects");
1163                         slab->objs_per_slab = get_obj("objs_per_slab");
1164                         slab->order = get_obj("order");
1165                         slab->partial = get_obj("partial");
1166                         slab->partial = get_obj_and_str("partial", &t);
1167                         decode_numa_list(slab->numa_partial, t);
1168                         free(t);
1169                         slab->poison = get_obj("poison");
1170                         slab->reclaim_account = get_obj("reclaim_account");
1171                         slab->red_zone = get_obj("red_zone");
1172                         slab->sanity_checks = get_obj("sanity_checks");
1173                         slab->slab_size = get_obj("slab_size");
1174                         slab->slabs = get_obj_and_str("slabs", &t);
1175                         decode_numa_list(slab->numa, t);
1176                         free(t);
1177                         slab->store_user = get_obj("store_user");
1178                         slab->trace = get_obj("trace");
1179                         slab->alloc_fastpath = get_obj("alloc_fastpath");
1180                         slab->alloc_slowpath = get_obj("alloc_slowpath");
1181                         slab->free_fastpath = get_obj("free_fastpath");
1182                         slab->free_slowpath = get_obj("free_slowpath");
1183                         slab->free_frozen= get_obj("free_frozen");
1184                         slab->free_add_partial = get_obj("free_add_partial");
1185                         slab->free_remove_partial = get_obj("free_remove_partial");
1186                         slab->alloc_from_partial = get_obj("alloc_from_partial");
1187                         slab->alloc_slab = get_obj("alloc_slab");
1188                         slab->alloc_refill = get_obj("alloc_refill");
1189                         slab->free_slab = get_obj("free_slab");
1190                         slab->cpuslab_flush = get_obj("cpuslab_flush");
1191                         slab->deactivate_full = get_obj("deactivate_full");
1192                         slab->deactivate_empty = get_obj("deactivate_empty");
1193                         slab->deactivate_to_head = get_obj("deactivate_to_head");
1194                         slab->deactivate_to_tail = get_obj("deactivate_to_tail");
1195                         slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
1196                         chdir("..");
1197                         if (slab->name[0] == ':')
1198                                 alias_targets++;
1199                         slab++;
1200                         break;
1201                    default :
1202                         fatal("Unknown file type %lx\n", de->d_type);
1203                 }
1204         }
1205         closedir(dir);
1206         slabs = slab - slabinfo;
1207         actual_slabs = slabs;
1208         aliases = alias - aliasinfo;
1209         if (slabs > MAX_SLABS)
1210                 fatal("Too many slabs\n");
1211         if (aliases > MAX_ALIASES)
1212                 fatal("Too many aliases\n");
1213 }
1214
1215 void output_slabs(void)
1216 {
1217         struct slabinfo *slab;
1218
1219         for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
1220
1221                 if (slab->alias)
1222                         continue;
1223
1224
1225                 if (show_numa)
1226                         slab_numa(slab, 0);
1227                 else if (show_track)
1228                         show_tracking(slab);
1229                 else if (validate)
1230                         slab_validate(slab);
1231                 else if (shrink)
1232                         slab_shrink(slab);
1233                 else if (set_debug)
1234                         slab_debug(slab);
1235                 else if (show_ops)
1236                         ops(slab);
1237                 else if (show_slab)
1238                         slabcache(slab);
1239                 else if (show_report)
1240                         report(slab);
1241         }
1242 }
1243
1244 struct option opts[] = {
1245         { "aliases", 0, NULL, 'a' },
1246         { "activity", 0, NULL, 'A' },
1247         { "debug", 2, NULL, 'd' },
1248         { "display-activity", 0, NULL, 'D' },
1249         { "empty", 0, NULL, 'e' },
1250         { "first-alias", 0, NULL, 'f' },
1251         { "help", 0, NULL, 'h' },
1252         { "inverted", 0, NULL, 'i'},
1253         { "numa", 0, NULL, 'n' },
1254         { "ops", 0, NULL, 'o' },
1255         { "report", 0, NULL, 'r' },
1256         { "shrink", 0, NULL, 's' },
1257         { "slabs", 0, NULL, 'l' },
1258         { "track", 0, NULL, 't'},
1259         { "validate", 0, NULL, 'v' },
1260         { "zero", 0, NULL, 'z' },
1261         { "1ref", 0, NULL, '1'},
1262         { NULL, 0, NULL, 0 }
1263 };
1264
1265 int main(int argc, char *argv[])
1266 {
1267         int c;
1268         int err;
1269         char *pattern_source;
1270
1271         page_size = getpagesize();
1272
1273         while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
1274                                                 opts, NULL)) != -1)
1275                 switch (c) {
1276                 case '1':
1277                         show_single_ref = 1;
1278                         break;
1279                 case 'a':
1280                         show_alias = 1;
1281                         break;
1282                 case 'A':
1283                         sort_active = 1;
1284                         break;
1285                 case 'd':
1286                         set_debug = 1;
1287                         if (!debug_opt_scan(optarg))
1288                                 fatal("Invalid debug option '%s'\n", optarg);
1289                         break;
1290                 case 'D':
1291                         show_activity = 1;
1292                         break;
1293                 case 'e':
1294                         show_empty = 1;
1295                         break;
1296                 case 'f':
1297                         show_first_alias = 1;
1298                         break;
1299                 case 'h':
1300                         usage();
1301                         return 0;
1302                 case 'i':
1303                         show_inverted = 1;
1304                         break;
1305                 case 'n':
1306                         show_numa = 1;
1307                         break;
1308                 case 'o':
1309                         show_ops = 1;
1310                         break;
1311                 case 'r':
1312                         show_report = 1;
1313                         break;
1314                 case 's':
1315                         shrink = 1;
1316                         break;
1317                 case 'l':
1318                         show_slab = 1;
1319                         break;
1320                 case 't':
1321                         show_track = 1;
1322                         break;
1323                 case 'v':
1324                         validate = 1;
1325                         break;
1326                 case 'z':
1327                         skip_zero = 0;
1328                         break;
1329                 case 'T':
1330                         show_totals = 1;
1331                         break;
1332                 case 'S':
1333                         sort_size = 1;
1334                         break;
1335
1336                 default:
1337                         fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1338
1339         }
1340
1341         if (!show_slab && !show_alias && !show_track && !show_report
1342                 && !validate && !shrink && !set_debug && !show_ops)
1343                         show_slab = 1;
1344
1345         if (argc > optind)
1346                 pattern_source = argv[optind];
1347         else
1348                 pattern_source = ".*";
1349
1350         err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1351         if (err)
1352                 fatal("%s: Invalid pattern '%s' code %d\n",
1353                         argv[0], pattern_source, err);
1354         read_slab_dir();
1355         if (show_alias)
1356                 alias();
1357         else
1358         if (show_totals)
1359                 totals();
1360         else {
1361                 link_slabs();
1362                 rename_slabs();
1363                 sort_slabs();
1364                 output_slabs();
1365         }
1366         return 0;
1367 }