ceph/src/seastar/dpdk/drivers/mempool/bucket/rte_mempool_bucket.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright (c) 2017-2018 Solarflare Communications Inc.
   4  * All rights reserved.
   5  *
   6  * This software was jointly developed between OKTET Labs (under contract
   7  * for Solarflare) and Solarflare Communications, Inc.
   8  */
   9
  10 #include <stdbool.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13
  14 #include <rte_errno.h>
  15 #include <rte_ring.h>
  16 #include <rte_mempool.h>
  17 #include <rte_malloc.h>
  18
  19 /*
  20  * The general idea of the bucket mempool driver is as follows.
  21  * We keep track of physically contiguous groups (buckets) of objects
  22  * of a certain size. Every such a group has a counter that is
  23  * incremented every time an object from that group is enqueued.
  24  * Until the bucket is full, no objects from it are eligible for allocation.
  25  * If a request is made to dequeue a multiply of bucket size, it is
  26  * satisfied by returning the whole buckets, instead of separate objects.
  27  */
  28
  29
  30 struct bucket_header {
  31         unsigned int lcore_id;
  32         uint8_t fill_cnt;
  33 };
  34
  35 struct bucket_stack {
  36         unsigned int top;
  37         unsigned int limit;
  38         void *objects[];
  39 };
  40
  41 struct bucket_data {
  42         unsigned int header_size;
  43         unsigned int total_elt_size;
  44         unsigned int obj_per_bucket;
  45         unsigned int bucket_stack_thresh;
  46         uintptr_t bucket_page_mask;
  47         struct rte_ring *shared_bucket_ring;
  48         struct bucket_stack *buckets[RTE_MAX_LCORE];
  49         /*
  50          * Multi-producer single-consumer ring to hold objects that are
  51          * returned to the mempool at a different lcore than initially
  52          * dequeued
  53          */
  54         struct rte_ring *adoption_buffer_rings[RTE_MAX_LCORE];
  55         struct rte_ring *shared_orphan_ring;
  56         struct rte_mempool *pool;
  57         unsigned int bucket_mem_size;
  58 };
  59
  60 static struct bucket_stack *
  61 bucket_stack_create(const struct rte_mempool *mp, unsigned int n_elts)
  62 {
  63         struct bucket_stack *stack;
  64
  65         stack = rte_zmalloc_socket("bucket_stack",
  66                                    sizeof(struct bucket_stack) +
  67                                    n_elts * sizeof(void *),
  68                                    RTE_CACHE_LINE_SIZE,
  69                                    mp->socket_id);
  70         if (stack == NULL)
  71                 return NULL;
  72         stack->limit = n_elts;
  73         stack->top = 0;
  74
  75         return stack;
  76 }
  77
  78 static void
  79 bucket_stack_push(struct bucket_stack *stack, void *obj)
  80 {
  81         RTE_ASSERT(stack->top < stack->limit);
  82         stack->objects[stack->top++] = obj;
  83 }
  84
  85 static void *
  86 bucket_stack_pop_unsafe(struct bucket_stack *stack)
  87 {
  88         RTE_ASSERT(stack->top > 0);
  89         return stack->objects[--stack->top];
  90 }
  91
  92 static void *
  93 bucket_stack_pop(struct bucket_stack *stack)
  94 {
  95         if (stack->top == 0)
  96                 return NULL;
  97         return bucket_stack_pop_unsafe(stack);
  98 }
  99
 100 static int
 101 bucket_enqueue_single(struct bucket_data *bd, void *obj)
 102 {
 103         int rc = 0;
 104         uintptr_t addr = (uintptr_t)obj;
 105         struct bucket_header *hdr;
 106         unsigned int lcore_id = rte_lcore_id();
 107
 108         addr &= bd->bucket_page_mask;
 109         hdr = (struct bucket_header *)addr;
 110
 111         if (likely(hdr->lcore_id == lcore_id)) {
 112                 if (hdr->fill_cnt < bd->obj_per_bucket - 1) {
 113                         hdr->fill_cnt++;
 114                 } else {
 115                         hdr->fill_cnt = 0;
 116                         /* Stack is big enough to put all buckets */
 117                         bucket_stack_push(bd->buckets[lcore_id], hdr);
 118                 }
 119         } else if (hdr->lcore_id != LCORE_ID_ANY) {
 120                 struct rte_ring *adopt_ring =
 121                         bd->adoption_buffer_rings[hdr->lcore_id];
 122
 123                 rc = rte_ring_enqueue(adopt_ring, obj);
 124                 /* Ring is big enough to put all objects */
 125                 RTE_ASSERT(rc == 0);
 126         } else if (hdr->fill_cnt < bd->obj_per_bucket - 1) {
 127                 hdr->fill_cnt++;
 128         } else {
 129                 hdr->fill_cnt = 0;
 130                 rc = rte_ring_enqueue(bd->shared_bucket_ring, hdr);
 131                 /* Ring is big enough to put all buckets */
 132                 RTE_ASSERT(rc == 0);
 133         }
 134
 135         return rc;
 136 }
 137
 138 static int
 139 bucket_enqueue(struct rte_mempool *mp, void * const *obj_table,
 140                unsigned int n)
 141 {
 142         struct bucket_data *bd = mp->pool_data;
 143         struct bucket_stack *local_stack = bd->buckets[rte_lcore_id()];
 144         unsigned int i;
 145         int rc = 0;
 146
 147         for (i = 0; i < n; i++) {
 148                 rc = bucket_enqueue_single(bd, obj_table[i]);
 149                 RTE_ASSERT(rc == 0);
 150         }
 151         if (local_stack->top > bd->bucket_stack_thresh) {
 152                 rte_ring_enqueue_bulk(bd->shared_bucket_ring,
 153                                       &local_stack->objects
 154                                       [bd->bucket_stack_thresh],
 155                                       local_stack->top -
 156                                       bd->bucket_stack_thresh,
 157                                       NULL);
 158             local_stack->top = bd->bucket_stack_thresh;
 159         }
 160         return rc;
 161 }
 162
 163 static void **
 164 bucket_fill_obj_table(const struct bucket_data *bd, void **pstart,
 165                       void **obj_table, unsigned int n)
 166 {
 167         unsigned int i;
 168         uint8_t *objptr = *pstart;
 169
 170         for (objptr += bd->header_size, i = 0; i < n;
 171              i++, objptr += bd->total_elt_size)
 172                 *obj_table++ = objptr;
 173         *pstart = objptr;
 174         return obj_table;
 175 }
 176
 177 static int
 178 bucket_dequeue_orphans(struct bucket_data *bd, void **obj_table,
 179                        unsigned int n_orphans)
 180 {
 181         unsigned int i;
 182         int rc;
 183         uint8_t *objptr;
 184
 185         rc = rte_ring_dequeue_bulk(bd->shared_orphan_ring, obj_table,
 186                                    n_orphans, NULL);
 187         if (unlikely(rc != (int)n_orphans)) {
 188                 struct bucket_header *hdr;
 189
 190                 objptr = bucket_stack_pop(bd->buckets[rte_lcore_id()]);
 191                 hdr = (struct bucket_header *)objptr;
 192
 193                 if (objptr == NULL) {
 194                         rc = rte_ring_dequeue(bd->shared_bucket_ring,
 195                                               (void **)&objptr);
 196                         if (rc != 0) {
 197                                 rte_errno = ENOBUFS;
 198                                 return -rte_errno;
 199                         }
 200                         hdr = (struct bucket_header *)objptr;
 201                         hdr->lcore_id = rte_lcore_id();
 202                 }
 203                 hdr->fill_cnt = 0;
 204                 bucket_fill_obj_table(bd, (void **)&objptr, obj_table,
 205                                       n_orphans);
 206                 for (i = n_orphans; i < bd->obj_per_bucket; i++,
 207                              objptr += bd->total_elt_size) {
 208                         rc = rte_ring_enqueue(bd->shared_orphan_ring,
 209                                               objptr);
 210                         if (rc != 0) {
 211                                 RTE_ASSERT(0);
 212                                 rte_errno = -rc;
 213                                 return rc;
 214                         }
 215                 }
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int
 222 bucket_dequeue_buckets(struct bucket_data *bd, void **obj_table,
 223                        unsigned int n_buckets)
 224 {
 225         struct bucket_stack *cur_stack = bd->buckets[rte_lcore_id()];
 226         unsigned int n_buckets_from_stack = RTE_MIN(n_buckets, cur_stack->top);
 227         void **obj_table_base = obj_table;
 228
 229         n_buckets -= n_buckets_from_stack;
 230         while (n_buckets_from_stack-- > 0) {
 231                 void *obj = bucket_stack_pop_unsafe(cur_stack);
 232
 233                 obj_table = bucket_fill_obj_table(bd, &obj, obj_table,
 234                                                   bd->obj_per_bucket);
 235         }
 236         while (n_buckets-- > 0) {
 237                 struct bucket_header *hdr;
 238
 239                 if (unlikely(rte_ring_dequeue(bd->shared_bucket_ring,
 240                                               (void **)&hdr) != 0)) {
 241                         /*
 242                          * Return the already-dequeued buffers
 243                          * back to the mempool
 244                          */
 245                         bucket_enqueue(bd->pool, obj_table_base,
 246                                        obj_table - obj_table_base);
 247                         rte_errno = ENOBUFS;
 248                         return -rte_errno;
 249                 }
 250                 hdr->lcore_id = rte_lcore_id();
 251                 obj_table = bucket_fill_obj_table(bd, (void **)&hdr,
 252                                                   obj_table,
 253                                                   bd->obj_per_bucket);
 254         }
 255
 256         return 0;
 257 }
 258
 259 static int
 260 bucket_adopt_orphans(struct bucket_data *bd)
 261 {
 262         int rc = 0;
 263         struct rte_ring *adopt_ring =
 264                 bd->adoption_buffer_rings[rte_lcore_id()];
 265
 266         if (unlikely(!rte_ring_empty(adopt_ring))) {
 267                 void *orphan;
 268
 269                 while (rte_ring_sc_dequeue(adopt_ring, &orphan) == 0) {
 270                         rc = bucket_enqueue_single(bd, orphan);
 271                         RTE_ASSERT(rc == 0);
 272                 }
 273         }
 274         return rc;
 275 }
 276
 277 static int
 278 bucket_dequeue(struct rte_mempool *mp, void **obj_table, unsigned int n)
 279 {
 280         struct bucket_data *bd = mp->pool_data;
 281         unsigned int n_buckets = n / bd->obj_per_bucket;
 282         unsigned int n_orphans = n - n_buckets * bd->obj_per_bucket;
 283         int rc = 0;
 284
 285         bucket_adopt_orphans(bd);
 286
 287         if (unlikely(n_orphans > 0)) {
 288                 rc = bucket_dequeue_orphans(bd, obj_table +
 289                                             (n_buckets * bd->obj_per_bucket),
 290                                             n_orphans);
 291                 if (rc != 0)
 292                         return rc;
 293         }
 294
 295         if (likely(n_buckets > 0)) {
 296                 rc = bucket_dequeue_buckets(bd, obj_table, n_buckets);
 297                 if (unlikely(rc != 0) && n_orphans > 0) {
 298                         rte_ring_enqueue_bulk(bd->shared_orphan_ring,
 299                                               obj_table + (n_buckets *
 300                                                            bd->obj_per_bucket),
 301                                               n_orphans, NULL);
 302                 }
 303         }
 304
 305         return rc;
 306 }
 307
 308 static int
 309 bucket_dequeue_contig_blocks(struct rte_mempool *mp, void **first_obj_table,
 310                              unsigned int n)
 311 {
 312         struct bucket_data *bd = mp->pool_data;
 313         const uint32_t header_size = bd->header_size;
 314         struct bucket_stack *cur_stack = bd->buckets[rte_lcore_id()];
 315         unsigned int n_buckets_from_stack = RTE_MIN(n, cur_stack->top);
 316         struct bucket_header *hdr;
 317         void **first_objp = first_obj_table;
 318
 319         bucket_adopt_orphans(bd);
 320
 321         n -= n_buckets_from_stack;
 322         while (n_buckets_from_stack-- > 0) {
 323                 hdr = bucket_stack_pop_unsafe(cur_stack);
 324                 *first_objp++ = (uint8_t *)hdr + header_size;
 325         }
 326         if (n > 0) {
 327                 if (unlikely(rte_ring_dequeue_bulk(bd->shared_bucket_ring,
 328                                                    first_objp, n, NULL) != n)) {
 329                         /* Return the already dequeued buckets */
 330                         while (first_objp-- != first_obj_table) {
 331                                 bucket_stack_push(cur_stack,
 332                                                   (uint8_t *)*first_objp -
 333                                                   header_size);
 334                         }
 335                         rte_errno = ENOBUFS;
 336                         return -rte_errno;
 337                 }
 338                 while (n-- > 0) {
 339                         hdr = (struct bucket_header *)*first_objp;
 340                         hdr->lcore_id = rte_lcore_id();
 341                         *first_objp++ = (uint8_t *)hdr + header_size;
 342                 }
 343         }
 344
 345         return 0;
 346 }
 347
 348 static void
 349 count_underfilled_buckets(struct rte_mempool *mp,
 350                           void *opaque,
 351                           struct rte_mempool_memhdr *memhdr,
 352                           __rte_unused unsigned int mem_idx)
 353 {
 354         unsigned int *pcount = opaque;
 355         const struct bucket_data *bd = mp->pool_data;
 356         unsigned int bucket_page_sz =
 357                 (unsigned int)(~bd->bucket_page_mask + 1);
 358         uintptr_t align;
 359         uint8_t *iter;
 360
 361         align = (uintptr_t)RTE_PTR_ALIGN_CEIL(memhdr->addr, bucket_page_sz) -
 362                 (uintptr_t)memhdr->addr;
 363
 364         for (iter = (uint8_t *)memhdr->addr + align;
 365              iter < (uint8_t *)memhdr->addr + memhdr->len;
 366              iter += bucket_page_sz) {
 367                 struct bucket_header *hdr = (struct bucket_header *)iter;
 368
 369                 *pcount += hdr->fill_cnt;
 370         }
 371 }
 372
 373 static unsigned int
 374 bucket_get_count(const struct rte_mempool *mp)
 375 {
 376         const struct bucket_data *bd = mp->pool_data;
 377         unsigned int count =
 378                 bd->obj_per_bucket * rte_ring_count(bd->shared_bucket_ring) +
 379                 rte_ring_count(bd->shared_orphan_ring);
 380         unsigned int i;
 381
 382         for (i = 0; i < RTE_MAX_LCORE; i++) {
 383                 if (!rte_lcore_is_enabled(i))
 384                         continue;
 385                 count += bd->obj_per_bucket * bd->buckets[i]->top +
 386                         rte_ring_count(bd->adoption_buffer_rings[i]);
 387         }
 388
 389         rte_mempool_mem_iter((struct rte_mempool *)(uintptr_t)mp,
 390                              count_underfilled_buckets, &count);
 391
 392         return count;
 393 }
 394
 395 static int
 396 bucket_alloc(struct rte_mempool *mp)
 397 {
 398         int rg_flags = 0;
 399         int rc = 0;
 400         char rg_name[RTE_RING_NAMESIZE];
 401         struct bucket_data *bd;
 402         unsigned int i;
 403         unsigned int bucket_header_size;
 404
 405         bd = rte_zmalloc_socket("bucket_pool", sizeof(*bd),
 406                                 RTE_CACHE_LINE_SIZE, mp->socket_id);
 407         if (bd == NULL) {
 408                 rc = -ENOMEM;
 409                 goto no_mem_for_data;
 410         }
 411         bd->pool = mp;
 412         if (mp->flags & MEMPOOL_F_NO_CACHE_ALIGN)
 413                 bucket_header_size = sizeof(struct bucket_header);
 414         else
 415                 bucket_header_size = RTE_CACHE_LINE_SIZE;
 416         RTE_BUILD_BUG_ON(sizeof(struct bucket_header) > RTE_CACHE_LINE_SIZE);
 417         bd->header_size = mp->header_size + bucket_header_size;
 418         bd->total_elt_size = mp->header_size + mp->elt_size + mp->trailer_size;
 419         bd->bucket_mem_size = RTE_DRIVER_MEMPOOL_BUCKET_SIZE_KB * 1024;
 420         bd->obj_per_bucket = (bd->bucket_mem_size - bucket_header_size) /
 421                 bd->total_elt_size;
 422         bd->bucket_page_mask = ~(rte_align64pow2(bd->bucket_mem_size) - 1);
 423         /* eventually this should be a tunable parameter */
 424         bd->bucket_stack_thresh = (mp->size / bd->obj_per_bucket) * 4 / 3;
 425
 426         if (mp->flags & MEMPOOL_F_SP_PUT)
 427                 rg_flags |= RING_F_SP_ENQ;
 428         if (mp->flags & MEMPOOL_F_SC_GET)
 429                 rg_flags |= RING_F_SC_DEQ;
 430
 431         for (i = 0; i < RTE_MAX_LCORE; i++) {
 432                 if (!rte_lcore_is_enabled(i))
 433                         continue;
 434                 bd->buckets[i] =
 435                         bucket_stack_create(mp, mp->size / bd->obj_per_bucket);
 436                 if (bd->buckets[i] == NULL) {
 437                         rc = -ENOMEM;
 438                         goto no_mem_for_stacks;
 439                 }
 440                 rc = snprintf(rg_name, sizeof(rg_name),
 441                               RTE_MEMPOOL_MZ_FORMAT ".a%u", mp->name, i);
 442                 if (rc < 0 || rc >= (int)sizeof(rg_name)) {
 443                         rc = -ENAMETOOLONG;
 444                         goto no_mem_for_stacks;
 445                 }
 446                 bd->adoption_buffer_rings[i] =
 447                         rte_ring_create(rg_name, rte_align32pow2(mp->size + 1),
 448                                         mp->socket_id,
 449                                         rg_flags | RING_F_SC_DEQ);
 450                 if (bd->adoption_buffer_rings[i] == NULL) {
 451                         rc = -rte_errno;
 452                         goto no_mem_for_stacks;
 453                 }
 454         }
 455
 456         rc = snprintf(rg_name, sizeof(rg_name),
 457                       RTE_MEMPOOL_MZ_FORMAT ".0", mp->name);
 458         if (rc < 0 || rc >= (int)sizeof(rg_name)) {
 459                 rc = -ENAMETOOLONG;
 460                 goto invalid_shared_orphan_ring;
 461         }
 462         bd->shared_orphan_ring =
 463                 rte_ring_create(rg_name, rte_align32pow2(mp->size + 1),
 464                                 mp->socket_id, rg_flags);
 465         if (bd->shared_orphan_ring == NULL) {
 466                 rc = -rte_errno;
 467                 goto cannot_create_shared_orphan_ring;
 468         }
 469
 470         rc = snprintf(rg_name, sizeof(rg_name),
 471                        RTE_MEMPOOL_MZ_FORMAT ".1", mp->name);
 472         if (rc < 0 || rc >= (int)sizeof(rg_name)) {
 473                 rc = -ENAMETOOLONG;
 474                 goto invalid_shared_bucket_ring;
 475         }
 476         bd->shared_bucket_ring =
 477                 rte_ring_create(rg_name,
 478                                 rte_align32pow2((mp->size + 1) /
 479                                                 bd->obj_per_bucket),
 480                                 mp->socket_id, rg_flags);
 481         if (bd->shared_bucket_ring == NULL) {
 482                 rc = -rte_errno;
 483                 goto cannot_create_shared_bucket_ring;
 484         }
 485
 486         mp->pool_data = bd;
 487
 488         return 0;
 489
 490 cannot_create_shared_bucket_ring:
 491 invalid_shared_bucket_ring:
 492         rte_ring_free(bd->shared_orphan_ring);
 493 cannot_create_shared_orphan_ring:
 494 invalid_shared_orphan_ring:
 495 no_mem_for_stacks:
 496         for (i = 0; i < RTE_MAX_LCORE; i++) {
 497                 rte_free(bd->buckets[i]);
 498                 rte_ring_free(bd->adoption_buffer_rings[i]);
 499         }
 500         rte_free(bd);
 501 no_mem_for_data:
 502         rte_errno = -rc;
 503         return rc;
 504 }
 505
 506 static void
 507 bucket_free(struct rte_mempool *mp)
 508 {
 509         unsigned int i;
 510         struct bucket_data *bd = mp->pool_data;
 511
 512         if (bd == NULL)
 513                 return;
 514
 515         for (i = 0; i < RTE_MAX_LCORE; i++) {
 516                 rte_free(bd->buckets[i]);
 517                 rte_ring_free(bd->adoption_buffer_rings[i]);
 518         }
 519
 520         rte_ring_free(bd->shared_orphan_ring);
 521         rte_ring_free(bd->shared_bucket_ring);
 522
 523         rte_free(bd);
 524 }
 525
 526 static ssize_t
 527 bucket_calc_mem_size(const struct rte_mempool *mp, uint32_t obj_num,
 528                      __rte_unused uint32_t pg_shift, size_t *min_total_elt_size,
 529                      size_t *align)
 530 {
 531         struct bucket_data *bd = mp->pool_data;
 532         unsigned int bucket_page_sz;
 533
 534         if (bd == NULL)
 535                 return -EINVAL;
 536
 537         bucket_page_sz = rte_align32pow2(bd->bucket_mem_size);
 538         *align = bucket_page_sz;
 539         *min_total_elt_size = bucket_page_sz;
 540         /*
 541          * Each bucket occupies its own block aligned to
 542          * bucket_page_sz, so the required amount of memory is
 543          * a multiple of bucket_page_sz.
 544          * We also need extra space for a bucket header
 545          */
 546         return ((obj_num + bd->obj_per_bucket - 1) /
 547                 bd->obj_per_bucket) * bucket_page_sz;
 548 }
 549
 550 static int
 551 bucket_populate(struct rte_mempool *mp, unsigned int max_objs,
 552                 void *vaddr, rte_iova_t iova, size_t len,
 553                 rte_mempool_populate_obj_cb_t *obj_cb, void *obj_cb_arg)
 554 {
 555         struct bucket_data *bd = mp->pool_data;
 556         unsigned int bucket_page_sz;
 557         unsigned int bucket_header_sz;
 558         unsigned int n_objs;
 559         uintptr_t align;
 560         uint8_t *iter;
 561         int rc;
 562
 563         if (bd == NULL)
 564                 return -EINVAL;
 565
 566         bucket_page_sz = rte_align32pow2(bd->bucket_mem_size);
 567         align = RTE_PTR_ALIGN_CEIL((uintptr_t)vaddr, bucket_page_sz) -
 568                 (uintptr_t)vaddr;
 569
 570         bucket_header_sz = bd->header_size - mp->header_size;
 571         if (iova != RTE_BAD_IOVA)
 572                 iova += align + bucket_header_sz;
 573
 574         for (iter = (uint8_t *)vaddr + align, n_objs = 0;
 575              iter < (uint8_t *)vaddr + len && n_objs < max_objs;
 576              iter += bucket_page_sz) {
 577                 struct bucket_header *hdr = (struct bucket_header *)iter;
 578                 unsigned int chunk_len = bd->bucket_mem_size;
 579
 580                 if ((size_t)(iter - (uint8_t *)vaddr) + chunk_len > len)
 581                         chunk_len = len - (iter - (uint8_t *)vaddr);
 582                 if (chunk_len <= bucket_header_sz)
 583                         break;
 584                 chunk_len -= bucket_header_sz;
 585
 586                 hdr->fill_cnt = 0;
 587                 hdr->lcore_id = LCORE_ID_ANY;
 588                 rc = rte_mempool_op_populate_default(mp,
 589                                                      RTE_MIN(bd->obj_per_bucket,
 590                                                              max_objs - n_objs),
 591                                                      iter + bucket_header_sz,
 592                                                      iova, chunk_len,
 593                                                      obj_cb, obj_cb_arg);
 594                 if (rc < 0)
 595                         return rc;
 596                 n_objs += rc;
 597                 if (iova != RTE_BAD_IOVA)
 598                         iova += bucket_page_sz;
 599         }
 600
 601         return n_objs;
 602 }
 603
 604 static int
 605 bucket_get_info(const struct rte_mempool *mp, struct rte_mempool_info *info)
 606 {
 607         struct bucket_data *bd = mp->pool_data;
 608
 609         info->contig_block_size = bd->obj_per_bucket;
 610         return 0;
 611 }
 612
 613
 614 static const struct rte_mempool_ops ops_bucket = {
 615         .name = "bucket",
 616         .alloc = bucket_alloc,
 617         .free = bucket_free,
 618         .enqueue = bucket_enqueue,
 619         .dequeue = bucket_dequeue,
 620         .get_count = bucket_get_count,
 621         .calc_mem_size = bucket_calc_mem_size,
 622         .populate = bucket_populate,
 623         .get_info = bucket_get_info,
 624         .dequeue_contig_blocks = bucket_dequeue_contig_blocks,
 625 };
 626
 627
 628 MEMPOOL_REGISTER_OPS(ops_bucket);