drivers/md/dm-zoned-reclaim.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2017 Western Digital Corporation or its affiliates.
   4  *
   5  * This file is released under the GPL.
   6  */
   7
   8 #include "dm-zoned.h"
   9
  10 #include <linux/module.h>
  11
  12 #define DM_MSG_PREFIX           "zoned reclaim"
  13
  14 struct dmz_reclaim {
  15         struct dmz_metadata     *metadata;
  16
  17         struct delayed_work     work;
  18         struct workqueue_struct *wq;
  19
  20         struct dm_kcopyd_client *kc;
  21         struct dm_kcopyd_throttle kc_throttle;
  22         int                     kc_err;
  23
  24         int                     dev_idx;
  25
  26         unsigned long           flags;
  27
  28         /* Last target access time */
  29         unsigned long           atime;
  30 };
  31
  32 /*
  33  * Reclaim state flags.
  34  */
  35 enum {
  36         DMZ_RECLAIM_KCOPY,
  37 };
  38
  39 /*
  40  * Number of seconds of target BIO inactivity to consider the target idle.
  41  */
  42 #define DMZ_IDLE_PERIOD                 (10UL * HZ)
  43
  44 /*
  45  * Percentage of unmapped (free) random zones below which reclaim starts
  46  * even if the target is busy.
  47  */
  48 #define DMZ_RECLAIM_LOW_UNMAP_ZONES     30
  49
  50 /*
  51  * Percentage of unmapped (free) random zones above which reclaim will
  52  * stop if the target is busy.
  53  */
  54 #define DMZ_RECLAIM_HIGH_UNMAP_ZONES    50
  55
  56 /*
  57  * Align a sequential zone write pointer to chunk_block.
  58  */
  59 static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
  60                                 sector_t block)
  61 {
  62         struct dmz_metadata *zmd = zrc->metadata;
  63         struct dmz_dev *dev = zone->dev;
  64         sector_t wp_block = zone->wp_block;
  65         unsigned int nr_blocks;
  66         int ret;
  67
  68         if (wp_block == block)
  69                 return 0;
  70
  71         if (wp_block > block)
  72                 return -EIO;
  73
  74         /*
  75          * Zeroout the space between the write
  76          * pointer and the requested position.
  77          */
  78         nr_blocks = block - wp_block;
  79         ret = blkdev_issue_zeroout(dev->bdev,
  80                                    dmz_start_sect(zmd, zone) + dmz_blk2sect(wp_block),
  81                                    dmz_blk2sect(nr_blocks), GFP_NOIO, 0);
  82         if (ret) {
  83                 dmz_dev_err(dev,
  84                             "Align zone %u wp %llu to %llu (wp+%u) blocks failed %d",
  85                             zone->id, (unsigned long long)wp_block,
  86                             (unsigned long long)block, nr_blocks, ret);
  87                 dmz_check_bdev(dev);
  88                 return ret;
  89         }
  90
  91         zone->wp_block = block;
  92
  93         return 0;
  94 }
  95
  96 /*
  97  * dm_kcopyd_copy end notification.
  98  */
  99 static void dmz_reclaim_kcopy_end(int read_err, unsigned long write_err,
 100                                   void *context)
 101 {
 102         struct dmz_reclaim *zrc = context;
 103
 104         if (read_err || write_err)
 105                 zrc->kc_err = -EIO;
 106         else
 107                 zrc->kc_err = 0;
 108
 109         clear_bit_unlock(DMZ_RECLAIM_KCOPY, &zrc->flags);
 110         smp_mb__after_atomic();
 111         wake_up_bit(&zrc->flags, DMZ_RECLAIM_KCOPY);
 112 }
 113
 114 /*
 115  * Copy valid blocks of src_zone into dst_zone.
 116  */
 117 static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
 118                             struct dm_zone *src_zone, struct dm_zone *dst_zone)
 119 {
 120         struct dmz_metadata *zmd = zrc->metadata;
 121         struct dm_io_region src, dst;
 122         sector_t block = 0, end_block;
 123         sector_t nr_blocks;
 124         sector_t src_zone_block;
 125         sector_t dst_zone_block;
 126         unsigned long flags = 0;
 127         int ret;
 128
 129         if (dmz_is_seq(src_zone))
 130                 end_block = src_zone->wp_block;
 131         else
 132                 end_block = dmz_zone_nr_blocks(zmd);
 133         src_zone_block = dmz_start_block(zmd, src_zone);
 134         dst_zone_block = dmz_start_block(zmd, dst_zone);
 135
 136         if (dmz_is_seq(dst_zone))
 137                 set_bit(DM_KCOPYD_WRITE_SEQ, &flags);
 138
 139         while (block < end_block) {
 140                 if (src_zone->dev->flags & DMZ_BDEV_DYING)
 141                         return -EIO;
 142                 if (dst_zone->dev->flags & DMZ_BDEV_DYING)
 143                         return -EIO;
 144
 145                 if (dmz_reclaim_should_terminate(src_zone))
 146                         return -EINTR;
 147
 148                 /* Get a valid region from the source zone */
 149                 ret = dmz_first_valid_block(zmd, src_zone, &block);
 150                 if (ret <= 0)
 151                         return ret;
 152                 nr_blocks = ret;
 153
 154                 /*
 155                  * If we are writing in a sequential zone, we must make sure
 156                  * that writes are sequential. So Zeroout any eventual hole
 157                  * between writes.
 158                  */
 159                 if (dmz_is_seq(dst_zone)) {
 160                         ret = dmz_reclaim_align_wp(zrc, dst_zone, block);
 161                         if (ret)
 162                                 return ret;
 163                 }
 164
 165                 src.bdev = src_zone->dev->bdev;
 166                 src.sector = dmz_blk2sect(src_zone_block + block);
 167                 src.count = dmz_blk2sect(nr_blocks);
 168
 169                 dst.bdev = dst_zone->dev->bdev;
 170                 dst.sector = dmz_blk2sect(dst_zone_block + block);
 171                 dst.count = src.count;
 172
 173                 /* Copy the valid region */
 174                 set_bit(DMZ_RECLAIM_KCOPY, &zrc->flags);
 175                 dm_kcopyd_copy(zrc->kc, &src, 1, &dst, flags,
 176                                dmz_reclaim_kcopy_end, zrc);
 177
 178                 /* Wait for copy to complete */
 179                 wait_on_bit_io(&zrc->flags, DMZ_RECLAIM_KCOPY,
 180                                TASK_UNINTERRUPTIBLE);
 181                 if (zrc->kc_err)
 182                         return zrc->kc_err;
 183
 184                 block += nr_blocks;
 185                 if (dmz_is_seq(dst_zone))
 186                         dst_zone->wp_block = block;
 187         }
 188
 189         return 0;
 190 }
 191
 192 /*
 193  * Move valid blocks of dzone buffer zone into dzone (after its write pointer)
 194  * and free the buffer zone.
 195  */
 196 static int dmz_reclaim_buf(struct dmz_reclaim *zrc, struct dm_zone *dzone)
 197 {
 198         struct dm_zone *bzone = dzone->bzone;
 199         sector_t chunk_block = dzone->wp_block;
 200         struct dmz_metadata *zmd = zrc->metadata;
 201         int ret;
 202
 203         DMDEBUG("(%s/%u): Chunk %u, move buf zone %u (weight %u) to data zone %u (weight %u)",
 204                 dmz_metadata_label(zmd), zrc->dev_idx,
 205                 dzone->chunk, bzone->id, dmz_weight(bzone),
 206                 dzone->id, dmz_weight(dzone));
 207
 208         /* Flush data zone into the buffer zone */
 209         ret = dmz_reclaim_copy(zrc, bzone, dzone);
 210         if (ret < 0)
 211                 return ret;
 212
 213         dmz_lock_flush(zmd);
 214
 215         /* Validate copied blocks */
 216         ret = dmz_merge_valid_blocks(zmd, bzone, dzone, chunk_block);
 217         if (ret == 0) {
 218                 /* Free the buffer zone */
 219                 dmz_invalidate_blocks(zmd, bzone, 0, dmz_zone_nr_blocks(zmd));
 220                 dmz_lock_map(zmd);
 221                 dmz_unmap_zone(zmd, bzone);
 222                 dmz_unlock_zone_reclaim(dzone);
 223                 dmz_free_zone(zmd, bzone);
 224                 dmz_unlock_map(zmd);
 225         }
 226
 227         dmz_unlock_flush(zmd);
 228
 229         return ret;
 230 }
 231
 232 /*
 233  * Merge valid blocks of dzone into its buffer zone and free dzone.
 234  */
 235 static int dmz_reclaim_seq_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
 236 {
 237         unsigned int chunk = dzone->chunk;
 238         struct dm_zone *bzone = dzone->bzone;
 239         struct dmz_metadata *zmd = zrc->metadata;
 240         int ret = 0;
 241
 242         DMDEBUG("(%s/%u): Chunk %u, move data zone %u (weight %u) to buf zone %u (weight %u)",
 243                 dmz_metadata_label(zmd), zrc->dev_idx,
 244                 chunk, dzone->id, dmz_weight(dzone),
 245                 bzone->id, dmz_weight(bzone));
 246
 247         /* Flush data zone into the buffer zone */
 248         ret = dmz_reclaim_copy(zrc, dzone, bzone);
 249         if (ret < 0)
 250                 return ret;
 251
 252         dmz_lock_flush(zmd);
 253
 254         /* Validate copied blocks */
 255         ret = dmz_merge_valid_blocks(zmd, dzone, bzone, 0);
 256         if (ret == 0) {
 257                 /*
 258                  * Free the data zone and remap the chunk to
 259                  * the buffer zone.
 260                  */
 261                 dmz_invalidate_blocks(zmd, dzone, 0, dmz_zone_nr_blocks(zmd));
 262                 dmz_lock_map(zmd);
 263                 dmz_unmap_zone(zmd, bzone);
 264                 dmz_unmap_zone(zmd, dzone);
 265                 dmz_unlock_zone_reclaim(dzone);
 266                 dmz_free_zone(zmd, dzone);
 267                 dmz_map_zone(zmd, bzone, chunk);
 268                 dmz_unlock_map(zmd);
 269         }
 270
 271         dmz_unlock_flush(zmd);
 272
 273         return ret;
 274 }
 275
 276 /*
 277  * Move valid blocks of the random data zone dzone into a free sequential zone.
 278  * Once blocks are moved, remap the zone chunk to the sequential zone.
 279  */
 280 static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
 281 {
 282         unsigned int chunk = dzone->chunk;
 283         struct dm_zone *szone = NULL;
 284         struct dmz_metadata *zmd = zrc->metadata;
 285         int ret;
 286         int alloc_flags = DMZ_ALLOC_SEQ;
 287
 288         /* Get a free random or sequential zone */
 289         dmz_lock_map(zmd);
 290 again:
 291         szone = dmz_alloc_zone(zmd, zrc->dev_idx,
 292                                alloc_flags | DMZ_ALLOC_RECLAIM);
 293         if (!szone && alloc_flags == DMZ_ALLOC_SEQ && dmz_nr_cache_zones(zmd)) {
 294                 alloc_flags = DMZ_ALLOC_RND;
 295                 goto again;
 296         }
 297         dmz_unlock_map(zmd);
 298         if (!szone)
 299                 return -ENOSPC;
 300
 301         DMDEBUG("(%s/%u): Chunk %u, move %s zone %u (weight %u) to %s zone %u",
 302                 dmz_metadata_label(zmd), zrc->dev_idx, chunk,
 303                 dmz_is_cache(dzone) ? "cache" : "rnd",
 304                 dzone->id, dmz_weight(dzone),
 305                 dmz_is_rnd(szone) ? "rnd" : "seq", szone->id);
 306
 307         /* Flush the random data zone into the sequential zone */
 308         ret = dmz_reclaim_copy(zrc, dzone, szone);
 309
 310         dmz_lock_flush(zmd);
 311
 312         if (ret == 0) {
 313                 /* Validate copied blocks */
 314                 ret = dmz_copy_valid_blocks(zmd, dzone, szone);
 315         }
 316         if (ret) {
 317                 /* Free the sequential zone */
 318                 dmz_lock_map(zmd);
 319                 dmz_free_zone(zmd, szone);
 320                 dmz_unlock_map(zmd);
 321         } else {
 322                 /* Free the data zone and remap the chunk */
 323                 dmz_invalidate_blocks(zmd, dzone, 0, dmz_zone_nr_blocks(zmd));
 324                 dmz_lock_map(zmd);
 325                 dmz_unmap_zone(zmd, dzone);
 326                 dmz_unlock_zone_reclaim(dzone);
 327                 dmz_free_zone(zmd, dzone);
 328                 dmz_map_zone(zmd, szone, chunk);
 329                 dmz_unlock_map(zmd);
 330         }
 331
 332         dmz_unlock_flush(zmd);
 333
 334         return ret;
 335 }
 336
 337 /*
 338  * Reclaim an empty zone.
 339  */
 340 static void dmz_reclaim_empty(struct dmz_reclaim *zrc, struct dm_zone *dzone)
 341 {
 342         struct dmz_metadata *zmd = zrc->metadata;
 343
 344         dmz_lock_flush(zmd);
 345         dmz_lock_map(zmd);
 346         dmz_unmap_zone(zmd, dzone);
 347         dmz_unlock_zone_reclaim(dzone);
 348         dmz_free_zone(zmd, dzone);
 349         dmz_unlock_map(zmd);
 350         dmz_unlock_flush(zmd);
 351 }
 352
 353 /*
 354  * Test if the target device is idle.
 355  */
 356 static inline int dmz_target_idle(struct dmz_reclaim *zrc)
 357 {
 358         return time_is_before_jiffies(zrc->atime + DMZ_IDLE_PERIOD);
 359 }
 360
 361 /*
 362  * Find a candidate zone for reclaim and process it.
 363  */
 364 static int dmz_do_reclaim(struct dmz_reclaim *zrc)
 365 {
 366         struct dmz_metadata *zmd = zrc->metadata;
 367         struct dm_zone *dzone;
 368         struct dm_zone *rzone;
 369         unsigned long start;
 370         int ret;
 371
 372         /* Get a data zone */
 373         dzone = dmz_get_zone_for_reclaim(zmd, zrc->dev_idx,
 374                                          dmz_target_idle(zrc));
 375         if (!dzone) {
 376                 DMDEBUG("(%s/%u): No zone found to reclaim",
 377                         dmz_metadata_label(zmd), zrc->dev_idx);
 378                 return -EBUSY;
 379         }
 380         rzone = dzone;
 381
 382         start = jiffies;
 383         if (dmz_is_cache(dzone) || dmz_is_rnd(dzone)) {
 384                 if (!dmz_weight(dzone)) {
 385                         /* Empty zone */
 386                         dmz_reclaim_empty(zrc, dzone);
 387                         ret = 0;
 388                 } else {
 389                         /*
 390                          * Reclaim the random data zone by moving its
 391                          * valid data blocks to a free sequential zone.
 392                          */
 393                         ret = dmz_reclaim_rnd_data(zrc, dzone);
 394                 }
 395         } else {
 396                 struct dm_zone *bzone = dzone->bzone;
 397                 sector_t chunk_block = 0;
 398
 399                 ret = dmz_first_valid_block(zmd, bzone, &chunk_block);
 400                 if (ret < 0)
 401                         goto out;
 402
 403                 if (ret == 0 || chunk_block >= dzone->wp_block) {
 404                         /*
 405                          * The buffer zone is empty or its valid blocks are
 406                          * after the data zone write pointer.
 407                          */
 408                         ret = dmz_reclaim_buf(zrc, dzone);
 409                         rzone = bzone;
 410                 } else {
 411                         /*
 412                          * Reclaim the data zone by merging it into the
 413                          * buffer zone so that the buffer zone itself can
 414                          * be later reclaimed.
 415                          */
 416                         ret = dmz_reclaim_seq_data(zrc, dzone);
 417                 }
 418         }
 419 out:
 420         if (ret) {
 421                 if (ret == -EINTR)
 422                         DMDEBUG("(%s/%u): reclaim zone %u interrupted",
 423                                 dmz_metadata_label(zmd), zrc->dev_idx,
 424                                 rzone->id);
 425                 else
 426                         DMDEBUG("(%s/%u): Failed to reclaim zone %u, err %d",
 427                                 dmz_metadata_label(zmd), zrc->dev_idx,
 428                                 rzone->id, ret);
 429                 dmz_unlock_zone_reclaim(dzone);
 430                 return ret;
 431         }
 432
 433         ret = dmz_flush_metadata(zrc->metadata);
 434         if (ret) {
 435                 DMDEBUG("(%s/%u): Metadata flush for zone %u failed, err %d",
 436                         dmz_metadata_label(zmd), zrc->dev_idx, rzone->id, ret);
 437                 return ret;
 438         }
 439
 440         DMDEBUG("(%s/%u): Reclaimed zone %u in %u ms",
 441                 dmz_metadata_label(zmd), zrc->dev_idx,
 442                 rzone->id, jiffies_to_msecs(jiffies - start));
 443         return 0;
 444 }
 445
 446 static unsigned int dmz_reclaim_percentage(struct dmz_reclaim *zrc)
 447 {
 448         struct dmz_metadata *zmd = zrc->metadata;
 449         unsigned int nr_cache = dmz_nr_cache_zones(zmd);
 450         unsigned int nr_unmap, nr_zones;
 451
 452         if (nr_cache) {
 453                 nr_zones = nr_cache;
 454                 nr_unmap = dmz_nr_unmap_cache_zones(zmd);
 455         } else {
 456                 nr_zones = dmz_nr_rnd_zones(zmd, zrc->dev_idx);
 457                 nr_unmap = dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx);
 458         }
 459         if (nr_unmap <= 1)
 460                 return 0;
 461         return nr_unmap * 100 / nr_zones;
 462 }
 463
 464 /*
 465  * Test if reclaim is necessary.
 466  */
 467 static bool dmz_should_reclaim(struct dmz_reclaim *zrc, unsigned int p_unmap)
 468 {
 469         unsigned int nr_reclaim;
 470
 471         nr_reclaim = dmz_nr_rnd_zones(zrc->metadata, zrc->dev_idx);
 472
 473         if (dmz_nr_cache_zones(zrc->metadata)) {
 474                 /*
 475                  * The first device in a multi-device
 476                  * setup only contains cache zones, so
 477                  * never start reclaim there.
 478                  */
 479                 if (zrc->dev_idx == 0)
 480                         return false;
 481                 nr_reclaim += dmz_nr_cache_zones(zrc->metadata);
 482         }
 483
 484         /* Reclaim when idle */
 485         if (dmz_target_idle(zrc) && nr_reclaim)
 486                 return true;
 487
 488         /* If there are still plenty of cache zones, do not reclaim */
 489         if (p_unmap >= DMZ_RECLAIM_HIGH_UNMAP_ZONES)
 490                 return false;
 491
 492         /*
 493          * If the percentage of unmapped cache zones is low,
 494          * reclaim even if the target is busy.
 495          */
 496         return p_unmap <= DMZ_RECLAIM_LOW_UNMAP_ZONES;
 497 }
 498
 499 /*
 500  * Reclaim work function.
 501  */
 502 static void dmz_reclaim_work(struct work_struct *work)
 503 {
 504         struct dmz_reclaim *zrc = container_of(work, struct dmz_reclaim, work.work);
 505         struct dmz_metadata *zmd = zrc->metadata;
 506         unsigned int p_unmap;
 507         int ret;
 508
 509         if (dmz_dev_is_dying(zmd))
 510                 return;
 511
 512         p_unmap = dmz_reclaim_percentage(zrc);
 513         if (!dmz_should_reclaim(zrc, p_unmap)) {
 514                 mod_delayed_work(zrc->wq, &zrc->work, DMZ_IDLE_PERIOD);
 515                 return;
 516         }
 517
 518         /*
 519          * We need to start reclaiming random zones: set up zone copy
 520          * throttling to either go fast if we are very low on random zones
 521          * and slower if there are still some free random zones to avoid
 522          * as much as possible to negatively impact the user workload.
 523          */
 524         if (dmz_target_idle(zrc) || p_unmap < DMZ_RECLAIM_LOW_UNMAP_ZONES / 2) {
 525                 /* Idle or very low percentage: go fast */
 526                 zrc->kc_throttle.throttle = 100;
 527         } else {
 528                 /* Busy but we still have some random zone: throttle */
 529                 zrc->kc_throttle.throttle = min(75U, 100U - p_unmap / 2);
 530         }
 531
 532         DMDEBUG("(%s/%u): Reclaim (%u): %s, %u%% free zones (%u/%u cache %u/%u random)",
 533                 dmz_metadata_label(zmd), zrc->dev_idx,
 534                 zrc->kc_throttle.throttle,
 535                 (dmz_target_idle(zrc) ? "Idle" : "Busy"),
 536                 p_unmap, dmz_nr_unmap_cache_zones(zmd),
 537                 dmz_nr_cache_zones(zmd),
 538                 dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx),
 539                 dmz_nr_rnd_zones(zmd, zrc->dev_idx));
 540
 541         ret = dmz_do_reclaim(zrc);
 542         if (ret && ret != -EINTR) {
 543                 if (!dmz_check_dev(zmd))
 544                         return;
 545         }
 546
 547         dmz_schedule_reclaim(zrc);
 548 }
 549
 550 /*
 551  * Initialize reclaim.
 552  */
 553 int dmz_ctr_reclaim(struct dmz_metadata *zmd,
 554                     struct dmz_reclaim **reclaim, int idx)
 555 {
 556         struct dmz_reclaim *zrc;
 557         int ret;
 558
 559         zrc = kzalloc(sizeof(struct dmz_reclaim), GFP_KERNEL);
 560         if (!zrc)
 561                 return -ENOMEM;
 562
 563         zrc->metadata = zmd;
 564         zrc->atime = jiffies;
 565         zrc->dev_idx = idx;
 566
 567         /* Reclaim kcopyd client */
 568         zrc->kc = dm_kcopyd_client_create(&zrc->kc_throttle);
 569         if (IS_ERR(zrc->kc)) {
 570                 ret = PTR_ERR(zrc->kc);
 571                 zrc->kc = NULL;
 572                 goto err;
 573         }
 574
 575         /* Reclaim work */
 576         INIT_DELAYED_WORK(&zrc->work, dmz_reclaim_work);
 577         zrc->wq = alloc_ordered_workqueue("dmz_rwq_%s_%d", WQ_MEM_RECLAIM,
 578                                           dmz_metadata_label(zmd), idx);
 579         if (!zrc->wq) {
 580                 ret = -ENOMEM;
 581                 goto err;
 582         }
 583
 584         *reclaim = zrc;
 585         queue_delayed_work(zrc->wq, &zrc->work, 0);
 586
 587         return 0;
 588 err:
 589         if (zrc->kc)
 590                 dm_kcopyd_client_destroy(zrc->kc);
 591         kfree(zrc);
 592
 593         return ret;
 594 }
 595
 596 /*
 597  * Terminate reclaim.
 598  */
 599 void dmz_dtr_reclaim(struct dmz_reclaim *zrc)
 600 {
 601         cancel_delayed_work_sync(&zrc->work);
 602         destroy_workqueue(zrc->wq);
 603         dm_kcopyd_client_destroy(zrc->kc);
 604         kfree(zrc);
 605 }
 606
 607 /*
 608  * Suspend reclaim.
 609  */
 610 void dmz_suspend_reclaim(struct dmz_reclaim *zrc)
 611 {
 612         cancel_delayed_work_sync(&zrc->work);
 613 }
 614
 615 /*
 616  * Resume reclaim.
 617  */
 618 void dmz_resume_reclaim(struct dmz_reclaim *zrc)
 619 {
 620         queue_delayed_work(zrc->wq, &zrc->work, DMZ_IDLE_PERIOD);
 621 }
 622
 623 /*
 624  * BIO accounting.
 625  */
 626 void dmz_reclaim_bio_acc(struct dmz_reclaim *zrc)
 627 {
 628         zrc->atime = jiffies;
 629 }
 630
 631 /*
 632  * Start reclaim if necessary.
 633  */
 634 void dmz_schedule_reclaim(struct dmz_reclaim *zrc)
 635 {
 636         unsigned int p_unmap = dmz_reclaim_percentage(zrc);
 637
 638         if (dmz_should_reclaim(zrc, p_unmap))
 639                 mod_delayed_work(zrc->wq, &zrc->work, 0);
 640 }