linux/Documentation/vm/slabinfo.c
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   1/*
   2 * Slabinfo: Tool to get reports about slabs
   3 *
   4 * (C) 2007 sgi, Christoph Lameter
   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
  26struct 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, objects_partial, objects_total;
  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, order_fallback;
  42        int numa[MAX_NODES];
  43        int numa_partial[MAX_NODES];
  44} slabinfo[MAX_SLABS];
  45
  46struct aliasinfo {
  47        char *name;
  48        char *ref;
  49        struct slabinfo *slab;
  50} aliasinfo[MAX_ALIASES];
  51
  52int slabs = 0;
  53int actual_slabs = 0;
  54int aliases = 0;
  55int alias_targets = 0;
  56int highest_node = 0;
  57
  58char buffer[4096];
  59
  60int show_empty = 0;
  61int show_report = 0;
  62int show_alias = 0;
  63int show_slab = 0;
  64int skip_zero = 1;
  65int show_numa = 0;
  66int show_track = 0;
  67int show_first_alias = 0;
  68int validate = 0;
  69int shrink = 0;
  70int show_inverted = 0;
  71int show_single_ref = 0;
  72int show_totals = 0;
  73int sort_size = 0;
  74int sort_active = 0;
  75int set_debug = 0;
  76int show_ops = 0;
  77int show_activity = 0;
  78
  79/* Debug options */
  80int sanity = 0;
  81int redzone = 0;
  82int poison = 0;
  83int tracking = 0;
  84int tracing = 0;
  85
  86int page_size;
  87
  88regex_t pattern;
  89
  90void 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
 100void usage(void)
 101{
 102        printf("slabinfo 5/7/2007. (c) 2007 sgi.\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
 134unsigned 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 */
 154unsigned long get_obj(const char *name)
 155{
 156        if (!read_obj(name))
 157                return 0;
 158
 159        return atol(buffer);
 160}
 161
 162unsigned 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
 181void 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
 195unsigned 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 */
 218int 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
 250void 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
 275void slab_validate(struct slabinfo *s)
 276{
 277        if (strcmp(s->name, "*") == 0)
 278                return;
 279
 280        set_obj(s, "validate", 1);
 281}
 282
 283void slab_shrink(struct slabinfo *s)
 284{
 285        if (strcmp(s->name, "*") == 0)
 286                return;
 287
 288        set_obj(s, "shrink", 1);
 289}
 290
 291int line = 0;
 292
 293void first_line(void)
 294{
 295        if (show_activity)
 296                printf("Name                   Objects      Alloc       Free   %%Fast Fallb O\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 */
 305struct 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
 321unsigned long slab_size(struct slabinfo *s)
 322{
 323        return  s->slabs * (page_size << s->order);
 324}
 325
 326unsigned long slab_activity(struct slabinfo *s)
 327{
 328        return  s->alloc_fastpath + s->free_fastpath +
 329                s->alloc_slowpath + s->free_slowpath;
 330}
 331
 332void 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
 377void 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
 395void 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
 408const char *onoff(int x)
 409{
 410        if (x)
 411                return "On ";
 412        return "Off";
 413}
 414
 415void 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
 480void 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
 521void 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->cpu_slabs,
 544                                                s->partial, s->cpu_slabs);
 545
 546        if (!line++)
 547                first_line();
 548
 549        if (s->aliases)
 550                *p++ = '*';
 551        if (s->cache_dma)
 552                *p++ = 'd';
 553        if (s->hwcache_align)
 554                *p++ = 'A';
 555        if (s->poison)
 556                *p++ = 'P';
 557        if (s->reclaim_account)
 558                *p++ = 'a';
 559        if (s->red_zone)
 560                *p++ = 'Z';
 561        if (s->sanity_checks)
 562                *p++ = 'F';
 563        if (s->store_user)
 564                *p++ = 'U';
 565        if (s->trace)
 566                *p++ = 'T';
 567
 568        *p = 0;
 569        if (show_activity) {
 570                unsigned long total_alloc;
 571                unsigned long total_free;
 572
 573                total_alloc = s->alloc_fastpath + s->alloc_slowpath;
 574                total_free = s->free_fastpath + s->free_slowpath;
 575
 576                printf("%-21s %8ld %10ld %10ld %3ld %3ld %5ld %1d\n",
 577                        s->name, s->objects,
 578                        total_alloc, total_free,
 579                        total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
 580                        total_free ? (s->free_fastpath * 100 / total_free) : 0,
 581                        s->order_fallback, s->order);
 582        }
 583        else
 584                printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
 585                        s->name, s->objects, s->object_size, size_str, dist_str,
 586                        s->objs_per_slab, s->order,
 587                        s->slabs ? (s->partial * 100) / s->slabs : 100,
 588                        s->slabs ? (s->objects * s->object_size * 100) /
 589                                (s->slabs * (page_size << s->order)) : 100,
 590                        flags);
 591}
 592
 593/*
 594 * Analyze debug options. Return false if something is amiss.
 595 */
 596int debug_opt_scan(char *opt)
 597{
 598        if (!opt || !opt[0] || strcmp(opt, "-") == 0)
 599                return 1;
 600
 601        if (strcasecmp(opt, "a") == 0) {
 602                sanity = 1;
 603                poison = 1;
 604                redzone = 1;
 605                tracking = 1;
 606                return 1;
 607        }
 608
 609        for ( ; *opt; opt++)
 610                switch (*opt) {
 611                case 'F' : case 'f':
 612                        if (sanity)
 613                                return 0;
 614                        sanity = 1;
 615                        break;
 616                case 'P' : case 'p':
 617                        if (poison)
 618                                return 0;
 619                        poison = 1;
 620                        break;
 621
 622                case 'Z' : case 'z':
 623                        if (redzone)
 624                                return 0;
 625                        redzone = 1;
 626                        break;
 627
 628                case 'U' : case 'u':
 629                        if (tracking)
 630                                return 0;
 631                        tracking = 1;
 632                        break;
 633
 634                case 'T' : case 't':
 635                        if (tracing)
 636                                return 0;
 637                        tracing = 1;
 638                        break;
 639                default:
 640                        return 0;
 641                }
 642        return 1;
 643}
 644
 645int slab_empty(struct slabinfo *s)
 646{
 647        if (s->objects > 0)
 648                return 0;
 649
 650        /*
 651         * We may still have slabs even if there are no objects. Shrinking will
 652         * remove them.
 653         */
 654        if (s->slabs != 0)
 655                set_obj(s, "shrink", 1);
 656
 657        return 1;
 658}
 659
 660void slab_debug(struct slabinfo *s)
 661{
 662        if (strcmp(s->name, "*") == 0)
 663                return;
 664
 665        if (sanity && !s->sanity_checks) {
 666                set_obj(s, "sanity", 1);
 667        }
 668        if (!sanity && s->sanity_checks) {
 669                if (slab_empty(s))
 670                        set_obj(s, "sanity", 0);
 671                else
 672                        fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
 673        }
 674        if (redzone && !s->red_zone) {
 675                if (slab_empty(s))
 676                        set_obj(s, "red_zone", 1);
 677                else
 678                        fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
 679        }
 680        if (!redzone && s->red_zone) {
 681                if (slab_empty(s))
 682                        set_obj(s, "red_zone", 0);
 683                else
 684                        fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
 685        }
 686        if (poison && !s->poison) {
 687                if (slab_empty(s))
 688                        set_obj(s, "poison", 1);
 689                else
 690                        fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
 691        }
 692        if (!poison && s->poison) {
 693                if (slab_empty(s))
 694                        set_obj(s, "poison", 0);
 695                else
 696                        fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
 697        }
 698        if (tracking && !s->store_user) {
 699                if (slab_empty(s))
 700                        set_obj(s, "store_user", 1);
 701                else
 702                        fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
 703        }
 704        if (!tracking && s->store_user) {
 705                if (slab_empty(s))
 706                        set_obj(s, "store_user", 0);
 707                else
 708                        fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
 709        }
 710        if (tracing && !s->trace) {
 711                if (slabs == 1)
 712                        set_obj(s, "trace", 1);
 713                else
 714                        fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
 715        }
 716        if (!tracing && s->trace)
 717                set_obj(s, "trace", 1);
 718}
 719
 720void totals(void)
 721{
 722        struct slabinfo *s;
 723
 724        int used_slabs = 0;
 725        char b1[20], b2[20], b3[20], b4[20];
 726        unsigned long long max = 1ULL << 63;
 727
 728        /* Object size */
 729        unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
 730
 731        /* Number of partial slabs in a slabcache */
 732        unsigned long long min_partial = max, max_partial = 0,
 733                                avg_partial, total_partial = 0;
 734
 735        /* Number of slabs in a slab cache */
 736        unsigned long long min_slabs = max, max_slabs = 0,
 737                                avg_slabs, total_slabs = 0;
 738
 739        /* Size of the whole slab */
 740        unsigned long long min_size = max, max_size = 0,
 741                                avg_size, total_size = 0;
 742
 743        /* Bytes used for object storage in a slab */
 744        unsigned long long min_used = max, max_used = 0,
 745                                avg_used, total_used = 0;
 746
 747        /* Waste: Bytes used for alignment and padding */
 748        unsigned long long min_waste = max, max_waste = 0,
 749                                avg_waste, total_waste = 0;
 750        /* Number of objects in a slab */
 751        unsigned long long min_objects = max, max_objects = 0,
 752                                avg_objects, total_objects = 0;
 753        /* Waste per object */
 754        unsigned long long min_objwaste = max,
 755                                max_objwaste = 0, avg_objwaste,
 756                                total_objwaste = 0;
 757
 758        /* Memory per object */
 759        unsigned long long min_memobj = max,
 760                                max_memobj = 0, avg_memobj,
 761                                total_objsize = 0;
 762
 763        /* Percentage of partial slabs per slab */
 764        unsigned long min_ppart = 100, max_ppart = 0,
 765                                avg_ppart, total_ppart = 0;
 766
 767        /* Number of objects in partial slabs */
 768        unsigned long min_partobj = max, max_partobj = 0,
 769                                avg_partobj, total_partobj = 0;
 770
 771        /* Percentage of partial objects of all objects in a slab */
 772        unsigned long min_ppartobj = 100, max_ppartobj = 0,
 773                                avg_ppartobj, total_ppartobj = 0;
 774
 775
 776        for (s = slabinfo; s < slabinfo + slabs; s++) {
 777                unsigned long long size;
 778                unsigned long used;
 779                unsigned long long wasted;
 780                unsigned long long objwaste;
 781                unsigned long percentage_partial_slabs;
 782                unsigned long percentage_partial_objs;
 783
 784                if (!s->slabs || !s->objects)
 785                        continue;
 786
 787                used_slabs++;
 788
 789                size = slab_size(s);
 790                used = s->objects * s->object_size;
 791                wasted = size - used;
 792                objwaste = s->slab_size - s->object_size;
 793
 794                percentage_partial_slabs = s->partial * 100 / s->slabs;
 795                if (percentage_partial_slabs > 100)
 796                        percentage_partial_slabs = 100;
 797
 798                percentage_partial_objs = s->objects_partial * 100
 799                                                        / s->objects;
 800
 801                if (percentage_partial_objs > 100)
 802                        percentage_partial_objs = 100;
 803
 804                if (s->object_size < min_objsize)
 805                        min_objsize = s->object_size;
 806                if (s->partial < min_partial)
 807                        min_partial = s->partial;
 808                if (s->slabs < min_slabs)
 809                        min_slabs = s->slabs;
 810                if (size < min_size)
 811                        min_size = size;
 812                if (wasted < min_waste)
 813                        min_waste = wasted;
 814                if (objwaste < min_objwaste)
 815                        min_objwaste = objwaste;
 816                if (s->objects < min_objects)
 817                        min_objects = s->objects;
 818                if (used < min_used)
 819                        min_used = used;
 820                if (s->objects_partial < min_partobj)
 821                        min_partobj = s->objects_partial;
 822                if (percentage_partial_slabs < min_ppart)
 823                        min_ppart = percentage_partial_slabs;
 824                if (percentage_partial_objs < min_ppartobj)
 825                        min_ppartobj = percentage_partial_objs;
 826                if (s->slab_size < min_memobj)
 827                        min_memobj = s->slab_size;
 828
 829                if (s->object_size > max_objsize)
 830                        max_objsize = s->object_size;
 831                if (s->partial > max_partial)
 832                        max_partial = s->partial;
 833                if (s->slabs > max_slabs)
 834                        max_slabs = s->slabs;
 835                if (size > max_size)
 836                        max_size = size;
 837                if (wasted > max_waste)
 838                        max_waste = wasted;
 839                if (objwaste > max_objwaste)
 840                        max_objwaste = objwaste;
 841                if (s->objects > max_objects)
 842                        max_objects = s->objects;
 843                if (used > max_used)
 844                        max_used = used;
 845                if (s->objects_partial > max_partobj)
 846                        max_partobj = s->objects_partial;
 847                if (percentage_partial_slabs > max_ppart)
 848                        max_ppart = percentage_partial_slabs;
 849                if (percentage_partial_objs > max_ppartobj)
 850                        max_ppartobj = percentage_partial_objs;
 851                if (s->slab_size > max_memobj)
 852                        max_memobj = s->slab_size;
 853
 854                total_partial += s->partial;
 855                total_slabs += s->slabs;
 856                total_size += size;
 857                total_waste += wasted;
 858
 859                total_objects += s->objects;
 860                total_used += used;
 861                total_partobj += s->objects_partial;
 862                total_ppart += percentage_partial_slabs;
 863                total_ppartobj += percentage_partial_objs;
 864
 865                total_objwaste += s->objects * objwaste;
 866                total_objsize += s->objects * s->slab_size;
 867        }
 868
 869        if (!total_objects) {
 870                printf("No objects\n");
 871                return;
 872        }
 873        if (!used_slabs) {
 874                printf("No slabs\n");
 875                return;
 876        }
 877
 878        /* Per slab averages */
 879        avg_partial = total_partial / used_slabs;
 880        avg_slabs = total_slabs / used_slabs;
 881        avg_size = total_size / used_slabs;
 882        avg_waste = total_waste / used_slabs;
 883
 884        avg_objects = total_objects / used_slabs;
 885        avg_used = total_used / used_slabs;
 886        avg_partobj = total_partobj / used_slabs;
 887        avg_ppart = total_ppart / used_slabs;
 888        avg_ppartobj = total_ppartobj / used_slabs;
 889
 890        /* Per object object sizes */
 891        avg_objsize = total_used / total_objects;
 892        avg_objwaste = total_objwaste / total_objects;
 893        avg_partobj = total_partobj * 100 / total_objects;
 894        avg_memobj = total_objsize / total_objects;
 895
 896        printf("Slabcache Totals\n");
 897        printf("----------------\n");
 898        printf("Slabcaches : %3d      Aliases  : %3d->%-3d Active: %3d\n",
 899                        slabs, aliases, alias_targets, used_slabs);
 900
 901        store_size(b1, total_size);store_size(b2, total_waste);
 902        store_size(b3, total_waste * 100 / total_used);
 903        printf("Memory used: %6s   # Loss   : %6s   MRatio:%6s%%\n", b1, b2, b3);
 904
 905        store_size(b1, total_objects);store_size(b2, total_partobj);
 906        store_size(b3, total_partobj * 100 / total_objects);
 907        printf("# Objects  : %6s   # PartObj: %6s   ORatio:%6s%%\n", b1, b2, b3);
 908
 909        printf("\n");
 910        printf("Per Cache    Average         Min         Max       Total\n");
 911        printf("---------------------------------------------------------\n");
 912
 913        store_size(b1, avg_objects);store_size(b2, min_objects);
 914        store_size(b3, max_objects);store_size(b4, total_objects);
 915        printf("#Objects  %10s  %10s  %10s  %10s\n",
 916                        b1,     b2,     b3,     b4);
 917
 918        store_size(b1, avg_slabs);store_size(b2, min_slabs);
 919        store_size(b3, max_slabs);store_size(b4, total_slabs);
 920        printf("#Slabs    %10s  %10s  %10s  %10s\n",
 921                        b1,     b2,     b3,     b4);
 922
 923        store_size(b1, avg_partial);store_size(b2, min_partial);
 924        store_size(b3, max_partial);store_size(b4, total_partial);
 925        printf("#PartSlab %10s  %10s  %10s  %10s\n",
 926                        b1,     b2,     b3,     b4);
 927        store_size(b1, avg_ppart);store_size(b2, min_ppart);
 928        store_size(b3, max_ppart);
 929        store_size(b4, total_partial * 100  / total_slabs);
 930        printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n",
 931                        b1,     b2,     b3,     b4);
 932
 933        store_size(b1, avg_partobj);store_size(b2, min_partobj);
 934        store_size(b3, max_partobj);
 935        store_size(b4, total_partobj);
 936        printf("PartObjs  %10s  %10s  %10s  %10s\n",
 937                        b1,     b2,     b3,     b4);
 938
 939        store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
 940        store_size(b3, max_ppartobj);
 941        store_size(b4, total_partobj * 100 / total_objects);
 942        printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n",
 943                        b1,     b2,     b3,     b4);
 944
 945        store_size(b1, avg_size);store_size(b2, min_size);
 946        store_size(b3, max_size);store_size(b4, total_size);
 947        printf("Memory    %10s  %10s  %10s  %10s\n",
 948                        b1,     b2,     b3,     b4);
 949
 950        store_size(b1, avg_used);store_size(b2, min_used);
 951        store_size(b3, max_used);store_size(b4, total_used);
 952        printf("Used      %10s  %10s  %10s  %10s\n",
 953                        b1,     b2,     b3,     b4);
 954
 955        store_size(b1, avg_waste);store_size(b2, min_waste);
 956        store_size(b3, max_waste);store_size(b4, total_waste);
 957        printf("Loss      %10s  %10s  %10s  %10s\n",
 958                        b1,     b2,     b3,     b4);
 959
 960        printf("\n");
 961        printf("Per Object   Average         Min         Max\n");
 962        printf("---------------------------------------------\n");
 963
 964        store_size(b1, avg_memobj);store_size(b2, min_memobj);
 965        store_size(b3, max_memobj);
 966        printf("Memory    %10s  %10s  %10s\n",
 967                        b1,     b2,     b3);
 968        store_size(b1, avg_objsize);store_size(b2, min_objsize);
 969        store_size(b3, max_objsize);
 970        printf("User      %10s  %10s  %10s\n",
 971                        b1,     b2,     b3);
 972
 973        store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
 974        store_size(b3, max_objwaste);
 975        printf("Loss      %10s  %10s  %10s\n",
 976                        b1,     b2,     b3);
 977}
 978
 979void sort_slabs(void)
 980{
 981        struct slabinfo *s1,*s2;
 982
 983        for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
 984                for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
 985                        int result;
 986
 987                        if (sort_size)
 988                                result = slab_size(s1) < slab_size(s2);
 989                        else if (sort_active)
 990                                result = slab_activity(s1) < slab_activity(s2);
 991                        else
 992                                result = strcasecmp(s1->name, s2->name);
 993
 994                        if (show_inverted)
 995                                result = -result;
 996
 997                        if (result > 0) {
 998                                struct slabinfo t;
 999
1000                                memcpy(&t, s1, sizeof(struct slabinfo));
1001                                memcpy(s1, s2, sizeof(struct slabinfo));
1002                                memcpy(s2, &t, sizeof(struct slabinfo));
1003                        }
1004                }
1005        }
1006}
1007
1008void sort_aliases(void)
1009{
1010        struct aliasinfo *a1,*a2;
1011
1012        for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
1013                for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
1014                        char *n1, *n2;
1015
1016                        n1 = a1->name;
1017                        n2 = a2->name;
1018                        if (show_alias && !show_inverted) {
1019                                n1 = a1->ref;
1020                                n2 = a2->ref;
1021                        }
1022                        if (strcasecmp(n1, n2) > 0) {
1023                                struct aliasinfo t;
1024
1025                                memcpy(&t, a1, sizeof(struct aliasinfo));
1026                                memcpy(a1, a2, sizeof(struct aliasinfo));
1027                                memcpy(a2, &t, sizeof(struct aliasinfo));
1028                        }
1029                }
1030        }
1031}
1032
1033void link_slabs(void)
1034{
1035        struct aliasinfo *a;
1036        struct slabinfo *s;
1037
1038        for (a = aliasinfo; a < aliasinfo + aliases; a++) {
1039
1040                for (s = slabinfo; s < slabinfo + slabs; s++)
1041                        if (strcmp(a->ref, s->name) == 0) {
1042                                a->slab = s;
1043                                s->refs++;
1044                                break;
1045                        }
1046                if (s == slabinfo + slabs)
1047                        fatal("Unresolved alias %s\n", a->ref);
1048        }
1049}
1050
1051void alias(void)
1052{
1053        struct aliasinfo *a;
1054        char *active = NULL;
1055
1056        sort_aliases();
1057        link_slabs();
1058
1059        for(a = aliasinfo; a < aliasinfo + aliases; a++) {
1060
1061                if (!show_single_ref && a->slab->refs == 1)
1062                        continue;
1063
1064                if (!show_inverted) {
1065                        if (active) {
1066                                if (strcmp(a->slab->name, active) == 0) {
1067                                        printf(" %s", a->name);
1068                                        continue;
1069                                }
1070                        }
1071                        printf("\n%-12s <- %s", a->slab->name, a->name);
1072                        active = a->slab->name;
1073                }
1074                else
1075                        printf("%-20s -> %s\n", a->name, a->slab->name);
1076        }
1077        if (active)
1078                printf("\n");
1079}
1080
1081
1082void rename_slabs(void)
1083{
1084        struct slabinfo *s;
1085        struct aliasinfo *a;
1086
1087        for (s = slabinfo; s < slabinfo + slabs; s++) {
1088                if (*s->name != ':')
1089                        continue;
1090
1091                if (s->refs > 1 && !show_first_alias)
1092                        continue;
1093
1094                a = find_one_alias(s);
1095
1096                if (a)
1097                        s->name = a->name;
1098                else {
1099                        s->name = "*";
1100                        actual_slabs--;
1101                }
1102        }
1103}
1104
1105int slab_mismatch(char *slab)
1106{
1107        return regexec(&pattern, slab, 0, NULL, 0);
1108}
1109
1110void read_slab_dir(void)
1111{
1112        DIR *dir;
1113        struct dirent *de;
1114        struct slabinfo *slab = slabinfo;
1115        struct aliasinfo *alias = aliasinfo;
1116        char *p;
1117        char *t;
1118        int count;
1119
1120        if (chdir("/sys/kernel/slab") && chdir("/sys/slab"))
1121                fatal("SYSFS support for SLUB not active\n");
1122
1123        dir = opendir(".");
1124        while ((de = readdir(dir))) {
1125                if (de->d_name[0] == '.' ||
1126                        (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1127                                continue;
1128                switch (de->d_type) {
1129                   case DT_LNK:
1130                        alias->name = strdup(de->d_name);
1131                        count = readlink(de->d_name, buffer, sizeof(buffer));
1132
1133                        if (count < 0)
1134                                fatal("Cannot read symlink %s\n", de->d_name);
1135
1136                        buffer[count] = 0;
1137                        p = buffer + count;
1138                        while (p > buffer && p[-1] != '/')
1139                                p--;
1140                        alias->ref = strdup(p);
1141                        alias++;
1142                        break;
1143                   case DT_DIR:
1144                        if (chdir(de->d_name))
1145                                fatal("Unable to access slab %s\n", slab->name);
1146                        slab->name = strdup(de->d_name);
1147                        slab->alias = 0;
1148                        slab->refs = 0;
1149                        slab->aliases = get_obj("aliases");
1150                        slab->align = get_obj("align");
1151                        slab->cache_dma = get_obj("cache_dma");
1152                        slab->cpu_slabs = get_obj("cpu_slabs");
1153                        slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1154                        slab->hwcache_align = get_obj("hwcache_align");
1155                        slab->object_size = get_obj("object_size");
1156                        slab->objects = get_obj("objects");
1157                        slab->objects_partial = get_obj("objects_partial");
1158                        slab->objects_total = get_obj("objects_total");
1159                        slab->objs_per_slab = get_obj("objs_per_slab");
1160                        slab->order = get_obj("order");
1161                        slab->partial = get_obj("partial");
1162                        slab->partial = get_obj_and_str("partial", &t);
1163                        decode_numa_list(slab->numa_partial, t);
1164                        free(t);
1165                        slab->poison = get_obj("poison");
1166                        slab->reclaim_account = get_obj("reclaim_account");
1167                        slab->red_zone = get_obj("red_zone");
1168                        slab->sanity_checks = get_obj("sanity_checks");
1169                        slab->slab_size = get_obj("slab_size");
1170                        slab->slabs = get_obj_and_str("slabs", &t);
1171                        decode_numa_list(slab->numa, t);
1172                        free(t);
1173                        slab->store_user = get_obj("store_user");
1174                        slab->trace = get_obj("trace");
1175                        slab->alloc_fastpath = get_obj("alloc_fastpath");
1176                        slab->alloc_slowpath = get_obj("alloc_slowpath");
1177                        slab->free_fastpath = get_obj("free_fastpath");
1178                        slab->free_slowpath = get_obj("free_slowpath");
1179                        slab->free_frozen= get_obj("free_frozen");
1180                        slab->free_add_partial = get_obj("free_add_partial");
1181                        slab->free_remove_partial = get_obj("free_remove_partial");
1182                        slab->alloc_from_partial = get_obj("alloc_from_partial");
1183                        slab->alloc_slab = get_obj("alloc_slab");
1184                        slab->alloc_refill = get_obj("alloc_refill");
1185                        slab->free_slab = get_obj("free_slab");
1186                        slab->cpuslab_flush = get_obj("cpuslab_flush");
1187                        slab->deactivate_full = get_obj("deactivate_full");
1188                        slab->deactivate_empty = get_obj("deactivate_empty");
1189                        slab->deactivate_to_head = get_obj("deactivate_to_head");
1190                        slab->deactivate_to_tail = get_obj("deactivate_to_tail");
1191                        slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
1192                        slab->order_fallback = get_obj("order_fallback");
1193                        chdir("..");
1194                        if (slab->name[0] == ':')
1195                                alias_targets++;
1196                        slab++;
1197                        break;
1198                   default :
1199                        fatal("Unknown file type %lx\n", de->d_type);
1200                }
1201        }
1202        closedir(dir);
1203        slabs = slab - slabinfo;
1204        actual_slabs = slabs;
1205        aliases = alias - aliasinfo;
1206        if (slabs > MAX_SLABS)
1207                fatal("Too many slabs\n");
1208        if (aliases > MAX_ALIASES)
1209                fatal("Too many aliases\n");
1210}
1211
1212void output_slabs(void)
1213{
1214        struct slabinfo *slab;
1215
1216        for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
1217
1218                if (slab->alias)
1219                        continue;
1220
1221
1222                if (show_numa)
1223                        slab_numa(slab, 0);
1224                else if (show_track)
1225                        show_tracking(slab);
1226                else if (validate)
1227                        slab_validate(slab);
1228                else if (shrink)
1229                        slab_shrink(slab);
1230                else if (set_debug)
1231                        slab_debug(slab);
1232                else if (show_ops)
1233                        ops(slab);
1234                else if (show_slab)
1235                        slabcache(slab);
1236                else if (show_report)
1237                        report(slab);
1238        }
1239}
1240
1241struct option opts[] = {
1242        { "aliases", 0, NULL, 'a' },
1243        { "activity", 0, NULL, 'A' },
1244        { "debug", 2, NULL, 'd' },
1245        { "display-activity", 0, NULL, 'D' },
1246        { "empty", 0, NULL, 'e' },
1247        { "first-alias", 0, NULL, 'f' },
1248        { "help", 0, NULL, 'h' },
1249        { "inverted", 0, NULL, 'i'},
1250        { "numa", 0, NULL, 'n' },
1251        { "ops", 0, NULL, 'o' },
1252        { "report", 0, NULL, 'r' },
1253        { "shrink", 0, NULL, 's' },
1254        { "slabs", 0, NULL, 'l' },
1255        { "track", 0, NULL, 't'},
1256        { "validate", 0, NULL, 'v' },
1257        { "zero", 0, NULL, 'z' },
1258        { "1ref", 0, NULL, '1'},
1259        { NULL, 0, NULL, 0 }
1260};
1261
1262int main(int argc, char *argv[])
1263{
1264        int c;
1265        int err;
1266        char *pattern_source;
1267
1268        page_size = getpagesize();
1269
1270        while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
1271                                                opts, NULL)) != -1)
1272                switch (c) {
1273                case '1':
1274                        show_single_ref = 1;
1275                        break;
1276                case 'a':
1277                        show_alias = 1;
1278                        break;
1279                case 'A':
1280                        sort_active = 1;
1281                        break;
1282                case 'd':
1283                        set_debug = 1;
1284                        if (!debug_opt_scan(optarg))
1285                                fatal("Invalid debug option '%s'\n", optarg);
1286                        break;
1287                case 'D':
1288                        show_activity = 1;
1289                        break;
1290                case 'e':
1291                        show_empty = 1;
1292                        break;
1293                case 'f':
1294                        show_first_alias = 1;
1295                        break;
1296                case 'h':
1297                        usage();
1298                        return 0;
1299                case 'i':
1300                        show_inverted = 1;
1301                        break;
1302                case 'n':
1303                        show_numa = 1;
1304                        break;
1305                case 'o':
1306                        show_ops = 1;
1307                        break;
1308                case 'r':
1309                        show_report = 1;
1310                        break;
1311                case 's':
1312                        shrink = 1;
1313                        break;
1314                case 'l':
1315                        show_slab = 1;
1316                        break;
1317                case 't':
1318                        show_track = 1;
1319                        break;
1320                case 'v':
1321                        validate = 1;
1322                        break;
1323                case 'z':
1324                        skip_zero = 0;
1325                        break;
1326                case 'T':
1327                        show_totals = 1;
1328                        break;
1329                case 'S':
1330                        sort_size = 1;
1331                        break;
1332
1333                default:
1334                        fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1335
1336        }
1337
1338        if (!show_slab && !show_alias && !show_track && !show_report
1339                && !validate && !shrink && !set_debug && !show_ops)
1340                        show_slab = 1;
1341
1342        if (argc > optind)
1343                pattern_source = argv[optind];
1344        else
1345                pattern_source = ".*";
1346
1347        err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1348        if (err)
1349                fatal("%s: Invalid pattern '%s' code %d\n",
1350                        argv[0], pattern_source, err);
1351        read_slab_dir();
1352        if (show_alias)
1353                alias();
1354        else
1355        if (show_totals)
1356                totals();
1357        else {
1358                link_slabs();
1359                rename_slabs();
1360                sort_slabs();
1361                output_slabs();
1362        }
1363        return 0;
1364}
1365
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