git.sur5r.net Git - openldap/blob - servers/slapd/sl_malloc.c

   1 /* sl_malloc.c - malloc routines using a per-thread slab */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2003-2011 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 #include "portable.h"
  18
  19 #include <stdio.h>
  20 #include <ac/string.h>
  21
  22 #include "slap.h"
  23
  24 enum {
  25         Align = 2 * sizeof(int),
  26         Align_log2 = 1 + (Align>2) + (Align>4) + (Align>8) + (Align>16),
  27         order_start = Align_log2 - 1,
  28         pad = Align - 1
  29 };
  30
  31 static struct slab_object * slap_replenish_sopool(struct slab_heap* sh);
  32 #ifdef SLAPD_UNUSED
  33 static void print_slheap(int level, void *ctx);
  34 #endif
  35
  36 /* Keep memory context in a thread-local var, or in a global when no threads */
  37 #ifdef NO_THREADS
  38 static struct slab_heap *slheap;
  39 # define SET_MEMCTX(thrctx, memctx, sfree)      ((void) (slheap = (memctx)))
  40 # define GET_MEMCTX(thrctx, memctxp)            (*(memctxp) = slheap))
  41 #else
  42 # define memctx_key ((void *) slap_sl_mem_init)
  43 # define SET_MEMCTX(thrctx, memctx, kfree) \
  44         ldap_pvt_thread_pool_setkey(thrctx,memctx_key, memctx,kfree, NULL,NULL)
  45 # define GET_MEMCTX(thrctx, memctxp) \
  46         ((void) (*(memctxp) = NULL), \
  47          (void) ldap_pvt_thread_pool_getkey(thrctx,memctx_key, memctxp,NULL), \
  48          *(memctxp))
  49 #endif /* NO_THREADS */
  50
  51
  52 /* Destroy the context, or if key==NULL clean it up for reuse. */
  53 void
  54 slap_sl_mem_destroy(
  55         void *key,
  56         void *data
  57 )
  58 {
  59         struct slab_heap *sh = data;
  60         struct slab_object *so;
  61         int i;
  62
  63         if (!sh->sh_stack) {
  64                 for (i = 0; i <= sh->sh_maxorder - order_start; i++) {
  65                         so = LDAP_LIST_FIRST(&sh->sh_free[i]);
  66                         while (so) {
  67                                 struct slab_object *so_tmp = so;
  68                                 so = LDAP_LIST_NEXT(so, so_link);
  69                                 LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, so_tmp, so_link);
  70                         }
  71                         ch_free(sh->sh_map[i]);
  72                 }
  73                 ch_free(sh->sh_free);
  74                 ch_free(sh->sh_map);
  75
  76                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
  77                 while (so) {
  78                         struct slab_object *so_tmp = so;
  79                         so = LDAP_LIST_NEXT(so, so_link);
  80                         if (!so_tmp->so_blockhead) {
  81                                 LDAP_LIST_REMOVE(so_tmp, so_link);
  82                         }
  83                 }
  84                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
  85                 while (so) {
  86                         struct slab_object *so_tmp = so;
  87                         so = LDAP_LIST_NEXT(so, so_link);
  88                         ch_free(so_tmp);
  89                 }
  90         }
  91
  92         if (key != NULL) {
  93                 ber_memfree_x(sh->sh_base, NULL);
  94                 ber_memfree_x(sh, NULL);
  95         }
  96 }
  97
  98 BerMemoryFunctions slap_sl_mfuncs =
  99         { slap_sl_malloc, slap_sl_calloc, slap_sl_realloc, slap_sl_free };
 100
 101 void
 102 slap_sl_mem_init()
 103 {
 104         assert( Align == 1 << Align_log2 );
 105         /* Adding head+tail preserves alignment */
 106         assert( 2*sizeof(ber_len_t) % Align == 0 );
 107
 108         ber_set_option( NULL, LBER_OPT_MEMORY_FNS, &slap_sl_mfuncs );
 109 }
 110
 111 /* This allocator always returns memory aligned on a 2-int boundary.
 112  *
 113  * The stack-based allocator stores the size as a ber_len_t at both
 114  * the head and tail of the allocated block. When freeing a block, the
 115  * tail length is ORed with 1 to mark it as free. Freed space can only
 116  * be reclaimed from the tail forward. If the tail block is never freed,
 117  * nothing else will be reclaimed until the slab is reset...
 118  */
 119 void *
 120 slap_sl_mem_create(
 121         ber_len_t size,
 122         int stack,
 123         void *thrctx,
 124         int new
 125 )
 126 {
 127         void *memctx;
 128         struct slab_heap *sh;
 129         ber_len_t size_shift;
 130         struct slab_object *so;
 131
 132         sh = GET_MEMCTX(thrctx, &memctx);
 133         if ( sh && !new )
 134                 return sh;
 135
 136         /* round up to doubleword boundary */
 137         size = (size + Align-1) & -Align;
 138
 139         if (!sh) {
 140                 sh = ch_malloc(sizeof(struct slab_heap));
 141                 sh->sh_base = ch_malloc(size);
 142                 SET_MEMCTX(thrctx, sh, slap_sl_mem_destroy);
 143         } else {
 144                 slap_sl_mem_destroy(NULL, sh);
 145                 if ( size > (char *)sh->sh_end - (char *)sh->sh_base ) {
 146                         void    *newptr;
 147
 148                         newptr = ch_realloc( sh->sh_base, size );
 149                         if ( newptr == NULL ) return NULL;
 150                         sh->sh_base = newptr;
 151                 }
 152         }
 153         sh->sh_end = (char *) sh->sh_base + size;
 154
 155         sh->sh_stack = stack;
 156         if (stack) {
 157                 /* insert dummy len */
 158                 {
 159                         ber_len_t *i = sh->sh_base;
 160                         *i++ = 0;
 161                         sh->sh_last = i;
 162                 }
 163         } else {
 164                 int i, order = -1, order_end = -1;
 165
 166                 size_shift = size - 1;
 167                 do {
 168                         order_end++;
 169                 } while (size_shift >>= 1);
 170                 order = order_end - order_start + 1;
 171                 sh->sh_maxorder = order_end;
 172
 173                 sh->sh_free = (struct sh_freelist *)
 174                                                 ch_malloc(order * sizeof(struct sh_freelist));
 175                 for (i = 0; i < order; i++) {
 176                         LDAP_LIST_INIT(&sh->sh_free[i]);
 177                 }
 178
 179                 LDAP_LIST_INIT(&sh->sh_sopool);
 180
 181                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 182                         slap_replenish_sopool(sh);
 183                 }
 184                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 185                 LDAP_LIST_REMOVE(so, so_link);
 186                 so->so_ptr = sh->sh_base;
 187
 188                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[order-1], so, so_link);
 189
 190                 sh->sh_map = (unsigned char **)
 191                                         ch_malloc(order * sizeof(unsigned char *));
 192                 for (i = 0; i < order; i++) {
 193                         int shiftamt = order_start + 1 + i;
 194                         int nummaps = size >> shiftamt;
 195                         assert(nummaps);
 196                         nummaps >>= 3;
 197                         if (!nummaps) nummaps = 1;
 198                         sh->sh_map[i] = (unsigned char *) ch_malloc(nummaps);
 199                         memset(sh->sh_map[i], 0, nummaps);
 200                 }
 201         }
 202         return sh;
 203 }
 204
 205 void
 206 slap_sl_mem_detach(
 207         void *thrctx,
 208         void *memctx
 209 )
 210 {
 211         /* separate from context */
 212         SET_MEMCTX(thrctx, NULL, 0);
 213 }
 214
 215 void *
 216 slap_sl_malloc(
 217     ber_len_t   size,
 218     void *ctx
 219 )
 220 {
 221         struct slab_heap *sh = ctx;
 222         ber_len_t *ptr, *newptr;
 223
 224 #ifdef SLAP_NO_SL_MALLOC
 225         newptr = ber_memalloc_x( size, NULL );
 226         if ( newptr ) return newptr;
 227         assert( 0 );
 228         exit( EXIT_FAILURE );
 229 #endif
 230
 231         /* ber_set_option calls us like this */
 232         if (!ctx) {
 233                 newptr = ber_memalloc_x( size, NULL );
 234                 if ( newptr ) return newptr;
 235                 assert( 0 );
 236                 exit( EXIT_FAILURE );
 237         }
 238
 239         /* round up to doubleword boundary, plus space for len at head and tail */
 240         size = (size + 2*sizeof(ber_len_t) + Align-1) & -Align;
 241
 242         if (sh->sh_stack) {
 243                 if ((char *)sh->sh_last + size >= (char *)sh->sh_end) {
 244                         Debug(LDAP_DEBUG_TRACE,
 245                                 "slap_sl_malloc of %lu bytes failed, using ch_malloc\n",
 246                                 (long)size, 0, 0);
 247                         return ch_malloc(size);
 248                 }
 249                 newptr = sh->sh_last;
 250                 sh->sh_last = (char *) sh->sh_last + size;
 251                 size -= sizeof(ber_len_t);
 252                 *newptr++ = size;
 253                 *(ber_len_t *)((char *)sh->sh_last - sizeof(ber_len_t)) = size;
 254                 return( (void *)newptr );
 255         } else {
 256                 struct slab_object *so_new, *so_left, *so_right;
 257                 ber_len_t size_shift;
 258                 unsigned long diff;
 259                 int i, j, order = -1;
 260
 261                 size_shift = size - 1;
 262                 do {
 263                         order++;
 264                 } while (size_shift >>= 1);
 265
 266                 for (i = order; i <= sh->sh_maxorder &&
 267                                 LDAP_LIST_EMPTY(&sh->sh_free[i-order_start]); i++);
 268
 269                 if (i == order) {
 270                         so_new = LDAP_LIST_FIRST(&sh->sh_free[i-order_start]);
 271                         LDAP_LIST_REMOVE(so_new, so_link);
 272                         ptr = so_new->so_ptr;
 273                         diff = (unsigned long)((char*)ptr -
 274                                         (char*)sh->sh_base) >> (order + 1);
 275                         sh->sh_map[order-order_start][diff>>3] |= (1 << (diff & 0x7));
 276                         *ptr++ = size - sizeof(ber_len_t);
 277                         LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, so_new, so_link);
 278                         return((void*)ptr);
 279                 } else if (i <= sh->sh_maxorder) {
 280                         for (j = i; j > order; j--) {
 281                                 so_left = LDAP_LIST_FIRST(&sh->sh_free[j-order_start]);
 282                                 LDAP_LIST_REMOVE(so_left, so_link);
 283                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 284                                         slap_replenish_sopool(sh);
 285                                 }
 286                                 so_right = LDAP_LIST_FIRST(&sh->sh_sopool);
 287                                 LDAP_LIST_REMOVE(so_right, so_link);
 288                                 so_right->so_ptr = (void *)((char *)so_left->so_ptr + (1 << j));
 289                                 if (j == order + 1) {
 290                                         ptr = so_left->so_ptr;
 291                                         diff = (unsigned long)((char*)ptr -
 292                                                         (char*)sh->sh_base) >> (order+1);
 293                                         sh->sh_map[order-order_start][diff>>3] |=
 294                                                         (1 << (diff & 0x7));
 295                                         *ptr++ = size - sizeof(ber_len_t);
 296                                         LDAP_LIST_INSERT_HEAD(
 297                                                         &sh->sh_free[j-1-order_start], so_right, so_link);
 298                                         LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, so_left, so_link);
 299                                         return((void*)ptr);
 300                                 } else {
 301                                         LDAP_LIST_INSERT_HEAD(
 302                                                         &sh->sh_free[j-1-order_start], so_right, so_link);
 303                                         LDAP_LIST_INSERT_HEAD(
 304                                                         &sh->sh_free[j-1-order_start], so_left, so_link);
 305                                 }
 306                         }
 307                 } else {
 308                         Debug( LDAP_DEBUG_TRACE,
 309                                 "sl_malloc %lu: ch_malloc\n",
 310                                 (long)size, 0, 0);
 311                         return (void*)ch_malloc(size);
 312                 }
 313         }
 314
 315         /* FIXME: missing return; guessing... */
 316         return NULL;
 317 }
 318
 319 void *
 320 slap_sl_calloc( ber_len_t n, ber_len_t size, void *ctx )
 321 {
 322         void *newptr;
 323
 324         newptr = slap_sl_malloc( n*size, ctx );
 325         if ( newptr ) {
 326                 memset( newptr, 0, n*size );
 327         }
 328         return newptr;
 329 }
 330
 331 void *
 332 slap_sl_realloc(void *ptr, ber_len_t size, void *ctx)
 333 {
 334         struct slab_heap *sh = ctx;
 335         ber_len_t oldsize, *p = (ber_len_t *) ptr;
 336         void *newptr;
 337
 338         if (ptr == NULL)
 339                 return slap_sl_malloc(size, ctx);
 340
 341 #ifdef SLAP_NO_SL_MALLOC
 342         newptr = ber_memrealloc_x( ptr, size, NULL );
 343         if ( newptr ) return newptr;
 344         assert( 0 );
 345         exit( EXIT_FAILURE );
 346 #endif
 347
 348         /* Not our memory? */
 349         if (!sh || ptr < sh->sh_base || ptr >= sh->sh_end) {
 350                 /* duplicate of realloc behavior, oh well */
 351                 newptr = ber_memrealloc_x(ptr, size, NULL);
 352                 if (newptr) {
 353                         return newptr;
 354                 }
 355                 Debug(LDAP_DEBUG_ANY, "ch_realloc of %lu bytes failed\n",
 356                                 (long) size, 0, 0);
 357                 assert(0);
 358                 exit( EXIT_FAILURE );
 359         }
 360
 361         if (size == 0) {
 362                 slap_sl_free(ptr, ctx);
 363                 return NULL;
 364         }
 365
 366         oldsize = p[-1];
 367
 368         if (sh->sh_stack) {
 369                 /* Round up to doubleword boundary, add room for head */
 370                 size = ((size + Align-1) & -Align) + sizeof( ber_len_t );
 371
 372                 p--;
 373
 374                 /* Never shrink blocks */
 375                 if (size <= oldsize) {
 376                         return ptr;
 377
 378                 /* If reallocing the last block, try to grow it */
 379                 } else if ((char *) ptr + oldsize == sh->sh_last) {
 380                         if (size < (char *) sh->sh_end - (char *) ptr) {
 381                                 sh->sh_last = (char *) ptr + size;
 382                                 p[0] = size;
 383                                 p[size/sizeof(ber_len_t)] = size;
 384                                 return ptr;
 385                         }
 386
 387                 /* Nowhere to grow, need to alloc and copy */
 388                 } else {
 389                         /* Slight optimization of the final realloc variant */
 390                         size -= sizeof(ber_len_t);
 391                         oldsize -= sizeof(ber_len_t);
 392                         newptr = slap_sl_malloc(size, ctx);
 393                         AC_MEMCPY(newptr, ptr, oldsize);
 394                         /* Not last block, can just mark old region as free */
 395                         p[p[0]/sizeof(ber_len_t)] |= 1;
 396                         return newptr;
 397                 }
 398
 399                 size -= sizeof(ber_len_t);
 400                 oldsize -= sizeof(ber_len_t);
 401
 402         } else if (oldsize > size) {
 403                 oldsize = size;
 404         }
 405
 406         newptr = slap_sl_malloc(size, ctx);
 407         AC_MEMCPY(newptr, ptr, oldsize);
 408         slap_sl_free(ptr, ctx);
 409         return newptr;
 410 }
 411
 412 void
 413 slap_sl_free(void *ptr, void *ctx)
 414 {
 415         struct slab_heap *sh = ctx;
 416         ber_len_t size;
 417         ber_len_t *p = (ber_len_t *)ptr, *tmpp;
 418
 419         if (!ptr)
 420                 return;
 421
 422 #ifdef SLAP_NO_SL_MALLOC
 423         ber_memfree_x( ptr, NULL );
 424         return;
 425 #endif
 426
 427         if (!sh || ptr < sh->sh_base || ptr >= sh->sh_end) {
 428                 ber_memfree_x(ptr, NULL);
 429
 430         } else if (sh->sh_stack) {
 431                 size = p[-1];
 432                 p = (ber_len_t *) ((char *) ptr + size);
 433                 /* mark it free */
 434                 p[-1] = size |= 1;
 435                 /* reclaim free space off tail */
 436                 if (sh->sh_last == p) {
 437                         do {
 438                                 p = (ber_len_t *) ((char *) p - size + 1) - 1;
 439                                 size = p[-1];
 440                         } while (size & 1);
 441                         sh->sh_last = p;
 442                 }
 443
 444         } else {
 445                 int size_shift, order_size;
 446                 struct slab_object *so;
 447                 unsigned long diff;
 448                 int i, inserted = 0, order = -1;
 449
 450                 size = *(--p);
 451                 size_shift = size + sizeof(ber_len_t) - 1;
 452                 do {
 453                         order++;
 454                 } while (size_shift >>= 1);
 455
 456                 for (i = order, tmpp = p; i <= sh->sh_maxorder; i++) {
 457                         order_size = 1 << (i+1);
 458                         diff = (unsigned long)((char*)tmpp - (char*)sh->sh_base) >> (i+1);
 459                         sh->sh_map[i-order_start][diff>>3] &= (~(1 << (diff & 0x7)));
 460                         if (diff == ((diff>>1)<<1)) {
 461                                 if (!(sh->sh_map[i-order_start][(diff+1)>>3] &
 462                                                 (1<<((diff+1)&0x7)))) {
 463                                         so = LDAP_LIST_FIRST(&sh->sh_free[i-order_start]);
 464                                         while (so) {
 465                                                 if ((char*)so->so_ptr == (char*)tmpp) {
 466                                                         LDAP_LIST_REMOVE( so, so_link );
 467                                                 } else if ((char*)so->so_ptr ==
 468                                                                 (char*)tmpp + order_size) {
 469                                                         LDAP_LIST_REMOVE(so, so_link);
 470                                                         break;
 471                                                 }
 472                                                 so = LDAP_LIST_NEXT(so, so_link);
 473                                         }
 474                                         if (so) {
 475                                                 if (i < sh->sh_maxorder) {
 476                                                         inserted = 1;
 477                                                         so->so_ptr = tmpp;
 478                                                         LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start+1],
 479                                                                         so, so_link);
 480                                                 }
 481                                                 continue;
 482                                         } else {
 483                                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 484                                                         slap_replenish_sopool(sh);
 485                                                 }
 486                                                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 487                                                 LDAP_LIST_REMOVE(so, so_link);
 488                                                 so->so_ptr = tmpp;
 489                                                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start],
 490                                                                 so, so_link);
 491                                                 break;
 492
 493                                                 Debug(LDAP_DEBUG_TRACE, "slap_sl_free: "
 494                                                         "free object not found while bit is clear.\n",
 495                                                         0, 0, 0);
 496                                                 assert(so != NULL);
 497
 498                                         }
 499                                 } else {
 500                                         if (!inserted) {
 501                                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 502                                                         slap_replenish_sopool(sh);
 503                                                 }
 504                                                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 505                                                 LDAP_LIST_REMOVE(so, so_link);
 506                                                 so->so_ptr = tmpp;
 507                                                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start],
 508                                                                 so, so_link);
 509                                         }
 510                                         break;
 511                                 }
 512                         } else {
 513                                 if (!(sh->sh_map[i-order_start][(diff-1)>>3] &
 514                                                 (1<<((diff-1)&0x7)))) {
 515                                         so = LDAP_LIST_FIRST(&sh->sh_free[i-order_start]);
 516                                         while (so) {
 517                                                 if ((char*)so->so_ptr == (char*)tmpp) {
 518                                                         LDAP_LIST_REMOVE(so, so_link);
 519                                                 } else if ((char*)tmpp == (char *)so->so_ptr + order_size) {
 520                                                         LDAP_LIST_REMOVE(so, so_link);
 521                                                         tmpp = so->so_ptr;
 522                                                         break;
 523                                                 }
 524                                                 so = LDAP_LIST_NEXT(so, so_link);
 525                                         }
 526                                         if (so) {
 527                                                 if (i < sh->sh_maxorder) {
 528                                                         inserted = 1;
 529                                                         LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start+1],                                                                    so, so_link);
 530                                                         continue;
 531                                                 }
 532                                         } else {
 533                                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 534                                                         slap_replenish_sopool(sh);
 535                                                 }
 536                                                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 537                                                 LDAP_LIST_REMOVE(so, so_link);
 538                                                 so->so_ptr = tmpp;
 539                                                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start],
 540                                                                 so, so_link);
 541                                                 break;
 542
 543                                                 Debug(LDAP_DEBUG_TRACE, "slap_sl_free: "
 544                                                         "free object not found while bit is clear.\n",
 545                                                         0, 0, 0 );
 546                                                 assert(so != NULL);
 547
 548                                         }
 549                                 } else {
 550                                         if ( !inserted ) {
 551                                                 if (LDAP_LIST_EMPTY(&sh->sh_sopool)) {
 552                                                         slap_replenish_sopool(sh);
 553                                                 }
 554                                                 so = LDAP_LIST_FIRST(&sh->sh_sopool);
 555                                                 LDAP_LIST_REMOVE(so, so_link);
 556                                                 so->so_ptr = tmpp;
 557                                                 LDAP_LIST_INSERT_HEAD(&sh->sh_free[i-order_start],
 558                                                                 so, so_link);
 559                                         }
 560                                         break;
 561                                 }
 562                         }
 563                 }
 564         }
 565 }
 566
 567 void *
 568 slap_sl_context( void *ptr )
 569 {
 570         void *memctx;
 571         struct slab_heap *sh;
 572
 573         if ( slapMode & SLAP_TOOL_MODE ) return NULL;
 574
 575         sh = GET_MEMCTX(ldap_pvt_thread_pool_context(), &memctx);
 576         if (sh && ptr >= sh->sh_base && ptr <= sh->sh_end) {
 577                 return sh;
 578         }
 579         return NULL;
 580 }
 581
 582 static struct slab_object *
 583 slap_replenish_sopool(
 584     struct slab_heap* sh
 585 )
 586 {
 587     struct slab_object *so_block;
 588     int i;
 589
 590     so_block = (struct slab_object *)ch_malloc(
 591                     SLAP_SLAB_SOBLOCK * sizeof(struct slab_object));
 592
 593     if ( so_block == NULL ) {
 594         return NULL;
 595     }
 596
 597     so_block[0].so_blockhead = 1;
 598     LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, &so_block[0], so_link);
 599     for (i = 1; i < SLAP_SLAB_SOBLOCK; i++) {
 600         so_block[i].so_blockhead = 0;
 601         LDAP_LIST_INSERT_HEAD(&sh->sh_sopool, &so_block[i], so_link );
 602     }
 603
 604     return so_block;
 605 }
 606
 607 #ifdef SLAPD_UNUSED
 608 static void
 609 print_slheap(int level, void *ctx)
 610 {
 611         struct slab_heap *sh = ctx;
 612         struct slab_object *so;
 613         int i, j, once = 0;
 614
 615         if (!ctx) {
 616                 Debug(level, "NULL memctx\n", 0, 0, 0);
 617                 return;
 618         }
 619
 620         Debug(level, "sh->sh_maxorder=%d\n", sh->sh_maxorder, 0, 0);
 621
 622         for (i = order_start; i <= sh->sh_maxorder; i++) {
 623                 once = 0;
 624                 Debug(level, "order=%d\n", i, 0, 0);
 625                 for (j = 0; j < (1<<(sh->sh_maxorder-i))/8; j++) {
 626                         Debug(level, "%02x ", sh->sh_map[i-order_start][j], 0, 0);
 627                         once = 1;
 628                 }
 629                 if (!once) {
 630                         Debug(level, "%02x ", sh->sh_map[i-order_start][0], 0, 0);
 631                 }
 632                 Debug(level, "\n", 0, 0, 0);
 633                 Debug(level, "free list:\n", 0, 0, 0);
 634                 so = LDAP_LIST_FIRST(&sh->sh_free[i-order_start]);
 635                 while (so) {
 636                         Debug(level, "%lx\n", (unsigned long) so->so_ptr, 0, 0);
 637                         so = LDAP_LIST_NEXT(so, so_link);
 638                 }
 639         }
 640 }
 641 #endif