1 // SPDX-License-Identifier: CDDL-1.0 2 /* 3 * CDDL HEADER START 4 * 5 * The contents of this file are subject to the terms of the 6 * Common Development and Distribution License (the "License"). 7 * You may not use this file except in compliance with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or https://opensource.org/licenses/CDDL-1.0. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2013, Delphix. All rights reserved. 25 * Copyright (c) 2013, Saso Kiselkov. All rights reserved. 26 * Copyright (c) 2013, Nexenta Systems, Inc. All rights reserved. 27 * Copyright (c) 2020, George Amanakis. All rights reserved. 28 */ 29 30 #ifndef _SYS_ARC_IMPL_H 31 #define _SYS_ARC_IMPL_H 32 33 #include <sys/arc.h> 34 #include <sys/multilist.h> 35 #include <sys/zio_crypt.h> 36 #include <sys/zthr.h> 37 #include <sys/aggsum.h> 38 #include <sys/wmsum.h> 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 /* 45 * Note that buffers can be in one of 6 states: 46 * ARC_anon - anonymous (discussed below) 47 * ARC_mru - recently used, currently cached 48 * ARC_mru_ghost - recently used, no longer in cache 49 * ARC_mfu - frequently used, currently cached 50 * ARC_mfu_ghost - frequently used, no longer in cache 51 * ARC_uncached - uncacheable prefetch, to be evicted 52 * ARC_l2c_only - exists in L2ARC but not other states 53 * When there are no active references to the buffer, they are 54 * are linked onto a list in one of these arc states. These are 55 * the only buffers that can be evicted or deleted. Within each 56 * state there are multiple lists, one for meta-data and one for 57 * non-meta-data. Meta-data (indirect blocks, blocks of dnodes, 58 * etc.) is tracked separately so that it can be managed more 59 * explicitly: favored over data, limited explicitly. 60 * 61 * Anonymous buffers are buffers that are not associated with 62 * a DVA. These are buffers that hold dirty block copies 63 * before they are written to stable storage. By definition, 64 * they are "ref'd" and are considered part of arc_mru 65 * that cannot be freed. Generally, they will acquire a DVA 66 * as they are written and migrate onto the arc_mru list. 67 * 68 * The ARC_l2c_only state is for buffers that are in the second 69 * level ARC but no longer in any of the ARC_m* lists. The second 70 * level ARC itself may also contain buffers that are in any of 71 * the ARC_m* states - meaning that a buffer can exist in two 72 * places. The reason for the ARC_l2c_only state is to keep the 73 * buffer header in the hash table, so that reads that hit the 74 * second level ARC benefit from these fast lookups. 75 */ 76 77 typedef struct arc_state { 78 /* 79 * list of evictable buffers 80 */ 81 multilist_t arcs_list[ARC_BUFC_NUMTYPES]; 82 /* 83 * supports the "dbufs" kstat 84 */ 85 arc_state_type_t arcs_state; 86 /* 87 * total amount of data in this state. 88 */ 89 zfs_refcount_t arcs_size[ARC_BUFC_NUMTYPES] ____cacheline_aligned; 90 /* 91 * total amount of evictable data in this state 92 */ 93 zfs_refcount_t arcs_esize[ARC_BUFC_NUMTYPES]; 94 /* 95 * amount of hit bytes for this state (counted only for ghost states) 96 */ 97 wmsum_t arcs_hits[ARC_BUFC_NUMTYPES]; 98 } arc_state_t; 99 100 typedef struct arc_callback arc_callback_t; 101 102 struct arc_callback { 103 void *acb_private; 104 arc_read_done_func_t *acb_done; 105 arc_buf_t *acb_buf; 106 boolean_t acb_encrypted; 107 boolean_t acb_compressed; 108 boolean_t acb_noauth; 109 boolean_t acb_nobuf; 110 boolean_t acb_wait; 111 int acb_wait_error; 112 kmutex_t acb_wait_lock; 113 kcondvar_t acb_wait_cv; 114 zbookmark_phys_t acb_zb; 115 zio_t *acb_zio_dummy; 116 zio_t *acb_zio_head; 117 arc_callback_t *acb_prev; 118 arc_callback_t *acb_next; 119 }; 120 121 typedef struct arc_write_callback arc_write_callback_t; 122 123 struct arc_write_callback { 124 void *awcb_private; 125 arc_write_done_func_t *awcb_ready; 126 arc_write_done_func_t *awcb_children_ready; 127 arc_write_done_func_t *awcb_done; 128 arc_buf_t *awcb_buf; 129 }; 130 131 /* 132 * ARC buffers are separated into multiple structs as a memory saving measure: 133 * - Common fields struct, always defined, and embedded within it: 134 * - L2-only fields, always allocated but undefined when not in L2ARC 135 * - L1-only fields, only allocated when in L1ARC 136 * 137 * Buffer in L1 Buffer only in L2 138 * +------------------------+ +------------------------+ 139 * | arc_buf_hdr_t | | arc_buf_hdr_t | 140 * | | | | 141 * | | | | 142 * | | | | 143 * +------------------------+ +------------------------+ 144 * | l2arc_buf_hdr_t | | l2arc_buf_hdr_t | 145 * | (undefined if L1-only) | | | 146 * +------------------------+ +------------------------+ 147 * | l1arc_buf_hdr_t | 148 * | | 149 * | | 150 * | | 151 * | | 152 * +------------------------+ 153 * 154 * Because it's possible for the L2ARC to become extremely large, we can wind 155 * up eating a lot of memory in L2ARC buffer headers, so the size of a header 156 * is minimized by only allocating the fields necessary for an L1-cached buffer 157 * when a header is actually in the L1 cache. The sub-headers (l1arc_buf_hdr and 158 * l2arc_buf_hdr) are embedded rather than allocated separately to save a couple 159 * words in pointers. arc_hdr_realloc() is used to switch a header between 160 * these two allocation states. 161 */ 162 typedef struct l1arc_buf_hdr { 163 /* protected by arc state mutex */ 164 arc_state_t *b_state; 165 multilist_node_t b_arc_node; 166 167 /* protected by hash lock */ 168 clock_t b_arc_access; 169 uint32_t b_mru_hits; 170 uint32_t b_mru_ghost_hits; 171 uint32_t b_mfu_hits; 172 uint32_t b_mfu_ghost_hits; 173 uint8_t b_byteswap; 174 arc_buf_t *b_buf; 175 176 /* self protecting */ 177 zfs_refcount_t b_refcnt; 178 179 arc_callback_t *b_acb; 180 abd_t *b_pabd; 181 182 #ifdef ZFS_DEBUG 183 zio_cksum_t *b_freeze_cksum; 184 kmutex_t b_freeze_lock; 185 #endif 186 } l1arc_buf_hdr_t; 187 188 typedef enum l2arc_dev_hdr_flags_t { 189 L2ARC_DEV_HDR_EVICT_FIRST = (1 << 0) /* mirror of l2ad_first */ 190 } l2arc_dev_hdr_flags_t; 191 192 /* 193 * Pointer used in persistent L2ARC (for pointing to log blocks). 194 */ 195 typedef struct l2arc_log_blkptr { 196 /* 197 * Offset of log block within the device, in bytes 198 */ 199 uint64_t lbp_daddr; 200 /* 201 * Aligned payload size (in bytes) of the log block 202 */ 203 uint64_t lbp_payload_asize; 204 /* 205 * Offset in bytes of the first buffer in the payload 206 */ 207 uint64_t lbp_payload_start; 208 /* 209 * lbp_prop has the following format: 210 * * logical size (in bytes) 211 * * aligned (after compression) size (in bytes) 212 * * compression algorithm (we always LZ4-compress l2arc logs) 213 * * checksum algorithm (used for lbp_cksum) 214 */ 215 uint64_t lbp_prop; 216 zio_cksum_t lbp_cksum; /* checksum of log */ 217 } l2arc_log_blkptr_t; 218 219 /* 220 * The persistent L2ARC device header. 221 * Byte order of magic determines whether 64-bit bswap of fields is necessary. 222 */ 223 typedef struct l2arc_dev_hdr_phys { 224 uint64_t dh_magic; /* L2ARC_DEV_HDR_MAGIC */ 225 uint64_t dh_version; /* Persistent L2ARC version */ 226 227 /* 228 * Global L2ARC device state and metadata. 229 */ 230 uint64_t dh_spa_guid; 231 uint64_t dh_vdev_guid; 232 uint64_t dh_log_entries; /* mirror of l2ad_log_entries */ 233 uint64_t dh_evict; /* evicted offset in bytes */ 234 uint64_t dh_flags; /* l2arc_dev_hdr_flags_t */ 235 /* 236 * Used in zdb.c for determining if a log block is valid, in the same 237 * way that l2arc_rebuild() does. 238 */ 239 uint64_t dh_start; /* mirror of l2ad_start */ 240 uint64_t dh_end; /* mirror of l2ad_end */ 241 /* 242 * Start of log block chain. [0] -> newest log, [1] -> one older (used 243 * for initiating prefetch). 244 */ 245 l2arc_log_blkptr_t dh_start_lbps[2]; 246 /* 247 * Aligned size of all log blocks as accounted by vdev_space_update(). 248 */ 249 uint64_t dh_lb_asize; /* mirror of l2ad_lb_asize */ 250 uint64_t dh_lb_count; /* mirror of l2ad_lb_count */ 251 /* 252 * Mirrors of vdev_trim_action_time and vdev_trim_state, used to 253 * display when the cache device was fully trimmed for the last 254 * time. 255 */ 256 uint64_t dh_trim_action_time; 257 uint64_t dh_trim_state; 258 const uint64_t dh_pad[30]; /* pad to 512 bytes */ 259 zio_eck_t dh_tail; 260 } l2arc_dev_hdr_phys_t; 261 _Static_assert(sizeof (l2arc_dev_hdr_phys_t) == SPA_MINBLOCKSIZE, 262 "l2arc_dev_hdr_phys_t wrong size"); 263 264 /* 265 * A single ARC buffer header entry in a l2arc_log_blk_phys_t. 266 */ 267 typedef struct l2arc_log_ent_phys { 268 dva_t le_dva; /* dva of buffer */ 269 uint64_t le_birth; /* birth txg of buffer */ 270 /* 271 * le_prop has the following format: 272 * * logical size (in bytes) 273 * * physical (compressed) size (in bytes) 274 * * compression algorithm 275 * * object type (used to restore arc_buf_contents_t) 276 * * protected status (used for encryption) 277 * * prefetch status (used in l2arc_read_done()) 278 */ 279 uint64_t le_prop; 280 uint64_t le_daddr; /* buf location on l2dev */ 281 uint64_t le_complevel; 282 /* 283 * We pad the size of each entry to a power of 2 so that the size of 284 * l2arc_log_blk_phys_t is power-of-2 aligned with SPA_MINBLOCKSHIFT, 285 * because of the L2ARC_SET_*SIZE macros. 286 */ 287 const uint64_t le_pad[2]; /* pad to 64 bytes */ 288 } l2arc_log_ent_phys_t; 289 290 #define L2ARC_LOG_BLK_MAX_ENTRIES (1022) 291 292 /* 293 * A log block of up to 1022 ARC buffer log entries, chained into the 294 * persistent L2ARC metadata linked list. Byte order of magic determines 295 * whether 64-bit bswap of fields is necessary. 296 */ 297 typedef struct l2arc_log_blk_phys { 298 uint64_t lb_magic; /* L2ARC_LOG_BLK_MAGIC */ 299 /* 300 * There are 2 chains (headed by dh_start_lbps[2]), and this field 301 * points back to the previous block in this chain. We alternate 302 * which chain we append to, so they are time-wise and offset-wise 303 * interleaved, but that is an optimization rather than for 304 * correctness. 305 */ 306 l2arc_log_blkptr_t lb_prev_lbp; /* pointer to prev log block */ 307 /* 308 * Pad header section to 128 bytes 309 */ 310 uint64_t lb_pad[7]; 311 /* Payload */ 312 l2arc_log_ent_phys_t lb_entries[L2ARC_LOG_BLK_MAX_ENTRIES]; 313 } l2arc_log_blk_phys_t; /* 64K total */ 314 315 /* 316 * The size of l2arc_log_blk_phys_t has to be power-of-2 aligned with 317 * SPA_MINBLOCKSHIFT because of L2BLK_SET_*SIZE macros. 318 */ 319 _Static_assert(IS_P2ALIGNED(sizeof (l2arc_log_blk_phys_t), 320 1ULL << SPA_MINBLOCKSHIFT), "l2arc_log_blk_phys_t misaligned"); 321 _Static_assert(sizeof (l2arc_log_blk_phys_t) >= SPA_MINBLOCKSIZE, 322 "l2arc_log_blk_phys_t too small"); 323 _Static_assert(sizeof (l2arc_log_blk_phys_t) <= SPA_MAXBLOCKSIZE, 324 "l2arc_log_blk_phys_t too big"); 325 326 /* 327 * These structures hold in-flight abd buffers for log blocks as they're being 328 * written to the L2ARC device. 329 */ 330 typedef struct l2arc_lb_abd_buf { 331 abd_t *abd; 332 list_node_t node; 333 } l2arc_lb_abd_buf_t; 334 335 /* 336 * These structures hold pointers to log blocks present on the L2ARC device. 337 */ 338 typedef struct l2arc_lb_ptr_buf { 339 l2arc_log_blkptr_t *lb_ptr; 340 list_node_t node; 341 } l2arc_lb_ptr_buf_t; 342 343 /* Macros for setting fields in le_prop and lbp_prop */ 344 #define L2BLK_GET_LSIZE(field) \ 345 BF64_GET_SB((field), 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1) 346 #define L2BLK_SET_LSIZE(field, x) \ 347 BF64_SET_SB((field), 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x) 348 #define L2BLK_GET_PSIZE(field) \ 349 BF64_GET_SB((field), 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1) 350 #define L2BLK_SET_PSIZE(field, x) \ 351 BF64_SET_SB((field), 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x) 352 #define L2BLK_GET_COMPRESS(field) \ 353 BF64_GET((field), 32, SPA_COMPRESSBITS) 354 #define L2BLK_SET_COMPRESS(field, x) \ 355 BF64_SET((field), 32, SPA_COMPRESSBITS, x) 356 #define L2BLK_GET_PREFETCH(field) BF64_GET((field), 39, 1) 357 #define L2BLK_SET_PREFETCH(field, x) BF64_SET((field), 39, 1, x) 358 #define L2BLK_GET_CHECKSUM(field) BF64_GET((field), 40, 8) 359 #define L2BLK_SET_CHECKSUM(field, x) BF64_SET((field), 40, 8, x) 360 /* +/- 1 here are to keep compatibility after ARC_BUFC_INVALID removal. */ 361 #define L2BLK_GET_TYPE(field) (BF64_GET((field), 48, 8) - 1) 362 #define L2BLK_SET_TYPE(field, x) BF64_SET((field), 48, 8, (x) + 1) 363 #define L2BLK_GET_PROTECTED(field) BF64_GET((field), 56, 1) 364 #define L2BLK_SET_PROTECTED(field, x) BF64_SET((field), 56, 1, x) 365 #define L2BLK_GET_STATE(field) BF64_GET((field), 57, 4) 366 #define L2BLK_SET_STATE(field, x) BF64_SET((field), 57, 4, x) 367 368 #define PTR_SWAP(x, y) \ 369 do { \ 370 void *tmp = (x);\ 371 x = y; \ 372 y = tmp; \ 373 } while (0) 374 375 #define L2ARC_DEV_HDR_MAGIC 0x5a46534341434845LLU /* ASCII: "ZFSCACHE" */ 376 #define L2ARC_LOG_BLK_MAGIC 0x4c4f47424c4b4844LLU /* ASCII: "LOGBLKHD" */ 377 378 /* 379 * L2ARC Internals 380 */ 381 typedef struct l2arc_dev { 382 vdev_t *l2ad_vdev; /* can be NULL during remove */ 383 spa_t *l2ad_spa; /* can be NULL during remove */ 384 uint64_t l2ad_hand; /* next write location */ 385 uint64_t l2ad_start; /* first addr on device */ 386 uint64_t l2ad_end; /* last addr on device */ 387 boolean_t l2ad_first; /* first sweep through */ 388 boolean_t l2ad_writing; /* currently writing */ 389 kmutex_t l2ad_mtx; /* lock for buffer list */ 390 list_t l2ad_buflist; /* buffer list */ 391 list_node_t l2ad_node; /* device list node */ 392 zfs_refcount_t l2ad_alloc; /* allocated bytes */ 393 /* 394 * Persistence-related stuff 395 */ 396 l2arc_dev_hdr_phys_t *l2ad_dev_hdr; /* persistent device header */ 397 uint64_t l2ad_dev_hdr_asize; /* aligned hdr size */ 398 l2arc_log_blk_phys_t l2ad_log_blk; /* currently open log block */ 399 int l2ad_log_ent_idx; /* index into cur log blk */ 400 /* Number of bytes in current log block's payload */ 401 uint64_t l2ad_log_blk_payload_asize; 402 /* 403 * Offset (in bytes) of the first buffer in current log block's 404 * payload. 405 */ 406 uint64_t l2ad_log_blk_payload_start; 407 /* Flag indicating whether a rebuild is scheduled or is going on */ 408 boolean_t l2ad_rebuild; 409 boolean_t l2ad_rebuild_cancel; 410 boolean_t l2ad_rebuild_began; 411 uint64_t l2ad_log_entries; /* entries per log blk */ 412 uint64_t l2ad_evict; /* evicted offset in bytes */ 413 /* List of pointers to log blocks present in the L2ARC device */ 414 list_t l2ad_lbptr_list; 415 /* 416 * Aligned size of all log blocks as accounted by vdev_space_update(). 417 */ 418 zfs_refcount_t l2ad_lb_asize; 419 /* 420 * Number of log blocks present on the device. 421 */ 422 zfs_refcount_t l2ad_lb_count; 423 boolean_t l2ad_trim_all; /* TRIM whole device */ 424 } l2arc_dev_t; 425 426 /* 427 * Encrypted blocks will need to be stored encrypted on the L2ARC 428 * disk as they appear in the main pool. In order for this to work we 429 * need to pass around the encryption parameters so they can be used 430 * to write data to the L2ARC. This struct is only defined in the 431 * arc_buf_hdr_t if the L1 header is defined and has the ARC_FLAG_ENCRYPTED 432 * flag set. 433 */ 434 typedef struct arc_buf_hdr_crypt { 435 abd_t *b_rabd; /* raw encrypted data */ 436 437 /* dsobj for looking up encryption key for l2arc encryption */ 438 uint64_t b_dsobj; 439 440 dmu_object_type_t b_ot; /* object type */ 441 442 /* encryption parameters */ 443 uint8_t b_salt[ZIO_DATA_SALT_LEN]; 444 uint8_t b_iv[ZIO_DATA_IV_LEN]; 445 446 /* 447 * Technically this could be removed since we will always be able to 448 * get the mac from the bp when we need it. However, it is inconvenient 449 * for callers of arc code to have to pass a bp in all the time. This 450 * also allows us to assert that L2ARC data is properly encrypted to 451 * match the data in the main storage pool. 452 */ 453 uint8_t b_mac[ZIO_DATA_MAC_LEN]; 454 } arc_buf_hdr_crypt_t; 455 456 typedef struct l2arc_buf_hdr { 457 /* protected by arc_buf_hdr mutex */ 458 l2arc_dev_t *b_dev; /* L2ARC device */ 459 uint64_t b_daddr; /* disk address, offset byte */ 460 uint32_t b_hits; 461 arc_state_type_t b_arcs_state; 462 list_node_t b_l2node; 463 } l2arc_buf_hdr_t; 464 465 typedef struct l2arc_write_callback { 466 l2arc_dev_t *l2wcb_dev; /* device info */ 467 arc_buf_hdr_t *l2wcb_head; /* head of write buflist */ 468 /* in-flight list of log blocks */ 469 list_t l2wcb_abd_list; 470 } l2arc_write_callback_t; 471 472 struct arc_buf_hdr { 473 /* protected by hash lock */ 474 dva_t b_dva; 475 uint64_t b_birth; 476 477 arc_buf_contents_t b_type; 478 uint8_t b_complevel; 479 uint8_t b_reserved1; /* used for 4 byte alignment */ 480 uint16_t b_l2size; /* alignment or L2-only size */ 481 arc_buf_hdr_t *b_hash_next; 482 arc_flags_t b_flags; 483 484 /* 485 * This field stores the size of the data buffer after 486 * compression, and is set in the arc's zio completion handlers. 487 * It is in units of SPA_MINBLOCKSIZE (e.g. 1 == 512 bytes). 488 * 489 * While the block pointers can store up to 32MB in their psize 490 * field, we can only store up to 32MB minus 512B. This is due 491 * to the bp using a bias of 1, whereas we use a bias of 0 (i.e. 492 * a field of zeros represents 512B in the bp). We can't use a 493 * bias of 1 since we need to reserve a psize of zero, here, to 494 * represent holes and embedded blocks. 495 * 496 * This isn't a problem in practice, since the maximum size of a 497 * buffer is limited to 16MB, so we never need to store 32MB in 498 * this field. Even in the upstream illumos code base, the 499 * maximum size of a buffer is limited to 16MB. 500 */ 501 uint16_t b_psize; 502 503 /* 504 * This field stores the size of the data buffer before 505 * compression, and cannot change once set. It is in units 506 * of SPA_MINBLOCKSIZE (e.g. 2 == 1024 bytes) 507 */ 508 uint16_t b_lsize; /* immutable */ 509 uint64_t b_spa; /* immutable */ 510 511 /* L2ARC fields. Undefined when not in L2ARC. */ 512 l2arc_buf_hdr_t b_l2hdr; 513 /* L1ARC fields. Undefined when in l2arc_only state */ 514 l1arc_buf_hdr_t b_l1hdr; 515 /* 516 * Encryption parameters. Defined only when ARC_FLAG_ENCRYPTED 517 * is set and the L1 header exists. 518 */ 519 arc_buf_hdr_crypt_t b_crypt_hdr; 520 }; 521 522 typedef struct arc_stats { 523 /* Number of requests that were satisfied without I/O. */ 524 kstat_named_t arcstat_hits; 525 /* Number of requests for which I/O was already running. */ 526 kstat_named_t arcstat_iohits; 527 /* Number of requests for which I/O has to be issued. */ 528 kstat_named_t arcstat_misses; 529 /* Same three, but specifically for demand data. */ 530 kstat_named_t arcstat_demand_data_hits; 531 kstat_named_t arcstat_demand_data_iohits; 532 kstat_named_t arcstat_demand_data_misses; 533 /* Same three, but specifically for demand metadata. */ 534 kstat_named_t arcstat_demand_metadata_hits; 535 kstat_named_t arcstat_demand_metadata_iohits; 536 kstat_named_t arcstat_demand_metadata_misses; 537 /* Same three, but specifically for prefetch data. */ 538 kstat_named_t arcstat_prefetch_data_hits; 539 kstat_named_t arcstat_prefetch_data_iohits; 540 kstat_named_t arcstat_prefetch_data_misses; 541 /* Same three, but specifically for prefetch metadata. */ 542 kstat_named_t arcstat_prefetch_metadata_hits; 543 kstat_named_t arcstat_prefetch_metadata_iohits; 544 kstat_named_t arcstat_prefetch_metadata_misses; 545 kstat_named_t arcstat_mru_hits; 546 kstat_named_t arcstat_mru_ghost_hits; 547 kstat_named_t arcstat_mfu_hits; 548 kstat_named_t arcstat_mfu_ghost_hits; 549 kstat_named_t arcstat_uncached_hits; 550 kstat_named_t arcstat_deleted; 551 /* 552 * Number of buffers that could not be evicted because the hash lock 553 * was held by another thread. The lock may not necessarily be held 554 * by something using the same buffer, since hash locks are shared 555 * by multiple buffers. 556 */ 557 kstat_named_t arcstat_mutex_miss; 558 /* 559 * Number of buffers skipped when updating the access state due to the 560 * header having already been released after acquiring the hash lock. 561 */ 562 kstat_named_t arcstat_access_skip; 563 /* 564 * Number of buffers skipped because they have I/O in progress, are 565 * indirect prefetch buffers that have not lived long enough, or are 566 * not from the spa we're trying to evict from. 567 */ 568 kstat_named_t arcstat_evict_skip; 569 /* 570 * Number of times arc_evict_state() was unable to evict enough 571 * buffers to reach its target amount. 572 */ 573 kstat_named_t arcstat_evict_not_enough; 574 kstat_named_t arcstat_evict_l2_cached; 575 kstat_named_t arcstat_evict_l2_eligible; 576 kstat_named_t arcstat_evict_l2_eligible_mfu; 577 kstat_named_t arcstat_evict_l2_eligible_mru; 578 kstat_named_t arcstat_evict_l2_ineligible; 579 kstat_named_t arcstat_evict_l2_skip; 580 kstat_named_t arcstat_hash_elements; 581 kstat_named_t arcstat_hash_elements_max; 582 kstat_named_t arcstat_hash_collisions; 583 kstat_named_t arcstat_hash_chains; 584 kstat_named_t arcstat_hash_chain_max; 585 kstat_named_t arcstat_meta; 586 kstat_named_t arcstat_pd; 587 kstat_named_t arcstat_pm; 588 kstat_named_t arcstat_c; 589 kstat_named_t arcstat_c_min; 590 kstat_named_t arcstat_c_max; 591 kstat_named_t arcstat_size; 592 /* 593 * Number of compressed bytes stored in the arc_buf_hdr_t's b_pabd. 594 * Note that the compressed bytes may match the uncompressed bytes 595 * if the block is either not compressed or compressed arc is disabled. 596 */ 597 kstat_named_t arcstat_compressed_size; 598 /* 599 * Uncompressed size of the data stored in b_pabd. If compressed 600 * arc is disabled then this value will be identical to the stat 601 * above. 602 */ 603 kstat_named_t arcstat_uncompressed_size; 604 /* 605 * Number of bytes stored in all the arc_buf_t's. This is classified 606 * as "overhead" since this data is typically short-lived and will 607 * be evicted from the arc when it becomes unreferenced unless the 608 * zfs_keep_uncompressed_metadata or zfs_keep_uncompressed_level 609 * values have been set (see comment in dbuf.c for more information). 610 */ 611 kstat_named_t arcstat_overhead_size; 612 /* 613 * Number of bytes consumed by internal ARC structures necessary 614 * for tracking purposes; these structures are not actually 615 * backed by ARC buffers. This includes arc_buf_hdr_t structures 616 * (allocated via arc_buf_hdr_t_full and arc_buf_hdr_t_l2only 617 * caches), and arc_buf_t structures (allocated via arc_buf_t 618 * cache). 619 */ 620 kstat_named_t arcstat_hdr_size; 621 /* 622 * Number of bytes consumed by ARC buffers of type equal to 623 * ARC_BUFC_DATA. This is generally consumed by buffers backing 624 * on disk user data (e.g. plain file contents). 625 */ 626 kstat_named_t arcstat_data_size; 627 /* 628 * Number of bytes consumed by ARC buffers of type equal to 629 * ARC_BUFC_METADATA. This is generally consumed by buffers 630 * backing on disk data that is used for internal ZFS 631 * structures (e.g. ZAP, dnode, indirect blocks, etc). 632 */ 633 kstat_named_t arcstat_metadata_size; 634 /* 635 * Number of bytes consumed by dmu_buf_impl_t objects. 636 */ 637 kstat_named_t arcstat_dbuf_size; 638 /* 639 * Number of bytes consumed by dnode_t objects. 640 */ 641 kstat_named_t arcstat_dnode_size; 642 /* 643 * Number of bytes consumed by bonus buffers. 644 */ 645 kstat_named_t arcstat_bonus_size; 646 #if defined(COMPAT_FREEBSD11) 647 /* 648 * Sum of the previous three counters, provided for compatibility. 649 */ 650 kstat_named_t arcstat_other_size; 651 #endif 652 653 /* 654 * Total number of bytes consumed by ARC buffers residing in the 655 * arc_anon state. This includes *all* buffers in the arc_anon 656 * state; e.g. data, metadata, evictable, and unevictable buffers 657 * are all included in this value. 658 */ 659 kstat_named_t arcstat_anon_size; 660 kstat_named_t arcstat_anon_data; 661 kstat_named_t arcstat_anon_metadata; 662 /* 663 * Number of bytes consumed by ARC buffers that meet the 664 * following criteria: backing buffers of type ARC_BUFC_DATA, 665 * residing in the arc_anon state, and are eligible for eviction 666 * (e.g. have no outstanding holds on the buffer). 667 */ 668 kstat_named_t arcstat_anon_evictable_data; 669 /* 670 * Number of bytes consumed by ARC buffers that meet the 671 * following criteria: backing buffers of type ARC_BUFC_METADATA, 672 * residing in the arc_anon state, and are eligible for eviction 673 * (e.g. have no outstanding holds on the buffer). 674 */ 675 kstat_named_t arcstat_anon_evictable_metadata; 676 /* 677 * Total number of bytes consumed by ARC buffers residing in the 678 * arc_mru state. This includes *all* buffers in the arc_mru 679 * state; e.g. data, metadata, evictable, and unevictable buffers 680 * are all included in this value. 681 */ 682 kstat_named_t arcstat_mru_size; 683 kstat_named_t arcstat_mru_data; 684 kstat_named_t arcstat_mru_metadata; 685 /* 686 * Number of bytes consumed by ARC buffers that meet the 687 * following criteria: backing buffers of type ARC_BUFC_DATA, 688 * residing in the arc_mru state, and are eligible for eviction 689 * (e.g. have no outstanding holds on the buffer). 690 */ 691 kstat_named_t arcstat_mru_evictable_data; 692 /* 693 * Number of bytes consumed by ARC buffers that meet the 694 * following criteria: backing buffers of type ARC_BUFC_METADATA, 695 * residing in the arc_mru state, and are eligible for eviction 696 * (e.g. have no outstanding holds on the buffer). 697 */ 698 kstat_named_t arcstat_mru_evictable_metadata; 699 /* 700 * Total number of bytes that *would have been* consumed by ARC 701 * buffers in the arc_mru_ghost state. The key thing to note 702 * here, is the fact that this size doesn't actually indicate 703 * RAM consumption. The ghost lists only consist of headers and 704 * don't actually have ARC buffers linked off of these headers. 705 * Thus, *if* the headers had associated ARC buffers, these 706 * buffers *would have* consumed this number of bytes. 707 */ 708 kstat_named_t arcstat_mru_ghost_size; 709 kstat_named_t arcstat_mru_ghost_data; 710 kstat_named_t arcstat_mru_ghost_metadata; 711 /* 712 * Number of bytes that *would have been* consumed by ARC 713 * buffers that are eligible for eviction, of type 714 * ARC_BUFC_DATA, and linked off the arc_mru_ghost state. 715 */ 716 kstat_named_t arcstat_mru_ghost_evictable_data; 717 /* 718 * Number of bytes that *would have been* consumed by ARC 719 * buffers that are eligible for eviction, of type 720 * ARC_BUFC_METADATA, and linked off the arc_mru_ghost state. 721 */ 722 kstat_named_t arcstat_mru_ghost_evictable_metadata; 723 /* 724 * Total number of bytes consumed by ARC buffers residing in the 725 * arc_mfu state. This includes *all* buffers in the arc_mfu 726 * state; e.g. data, metadata, evictable, and unevictable buffers 727 * are all included in this value. 728 */ 729 kstat_named_t arcstat_mfu_size; 730 kstat_named_t arcstat_mfu_data; 731 kstat_named_t arcstat_mfu_metadata; 732 /* 733 * Number of bytes consumed by ARC buffers that are eligible for 734 * eviction, of type ARC_BUFC_DATA, and reside in the arc_mfu 735 * state. 736 */ 737 kstat_named_t arcstat_mfu_evictable_data; 738 /* 739 * Number of bytes consumed by ARC buffers that are eligible for 740 * eviction, of type ARC_BUFC_METADATA, and reside in the 741 * arc_mfu state. 742 */ 743 kstat_named_t arcstat_mfu_evictable_metadata; 744 /* 745 * Total number of bytes that *would have been* consumed by ARC 746 * buffers in the arc_mfu_ghost state. See the comment above 747 * arcstat_mru_ghost_size for more details. 748 */ 749 kstat_named_t arcstat_mfu_ghost_size; 750 kstat_named_t arcstat_mfu_ghost_data; 751 kstat_named_t arcstat_mfu_ghost_metadata; 752 /* 753 * Number of bytes that *would have been* consumed by ARC 754 * buffers that are eligible for eviction, of type 755 * ARC_BUFC_DATA, and linked off the arc_mfu_ghost state. 756 */ 757 kstat_named_t arcstat_mfu_ghost_evictable_data; 758 /* 759 * Number of bytes that *would have been* consumed by ARC 760 * buffers that are eligible for eviction, of type 761 * ARC_BUFC_METADATA, and linked off the arc_mru_ghost state. 762 */ 763 kstat_named_t arcstat_mfu_ghost_evictable_metadata; 764 /* 765 * Total number of bytes that are going to be evicted from ARC due to 766 * ARC_FLAG_UNCACHED being set. 767 */ 768 kstat_named_t arcstat_uncached_size; 769 kstat_named_t arcstat_uncached_data; 770 kstat_named_t arcstat_uncached_metadata; 771 /* 772 * Number of data bytes that are going to be evicted from ARC due to 773 * ARC_FLAG_UNCACHED being set. 774 */ 775 kstat_named_t arcstat_uncached_evictable_data; 776 /* 777 * Number of metadata bytes that that are going to be evicted from ARC 778 * due to ARC_FLAG_UNCACHED being set. 779 */ 780 kstat_named_t arcstat_uncached_evictable_metadata; 781 kstat_named_t arcstat_l2_hits; 782 kstat_named_t arcstat_l2_misses; 783 /* 784 * Allocated size (in bytes) of L2ARC cached buffers by ARC state. 785 */ 786 kstat_named_t arcstat_l2_prefetch_asize; 787 kstat_named_t arcstat_l2_mru_asize; 788 kstat_named_t arcstat_l2_mfu_asize; 789 /* 790 * Allocated size (in bytes) of L2ARC cached buffers by buffer content 791 * type. 792 */ 793 kstat_named_t arcstat_l2_bufc_data_asize; 794 kstat_named_t arcstat_l2_bufc_metadata_asize; 795 kstat_named_t arcstat_l2_feeds; 796 kstat_named_t arcstat_l2_rw_clash; 797 kstat_named_t arcstat_l2_read_bytes; 798 kstat_named_t arcstat_l2_write_bytes; 799 kstat_named_t arcstat_l2_writes_sent; 800 kstat_named_t arcstat_l2_writes_done; 801 kstat_named_t arcstat_l2_writes_error; 802 kstat_named_t arcstat_l2_writes_lock_retry; 803 kstat_named_t arcstat_l2_evict_lock_retry; 804 kstat_named_t arcstat_l2_evict_reading; 805 kstat_named_t arcstat_l2_evict_l1cached; 806 kstat_named_t arcstat_l2_free_on_write; 807 kstat_named_t arcstat_l2_abort_lowmem; 808 kstat_named_t arcstat_l2_cksum_bad; 809 kstat_named_t arcstat_l2_io_error; 810 kstat_named_t arcstat_l2_lsize; 811 kstat_named_t arcstat_l2_psize; 812 kstat_named_t arcstat_l2_hdr_size; 813 /* 814 * Number of L2ARC log blocks written. These are used for restoring the 815 * L2ARC. Updated during writing of L2ARC log blocks. 816 */ 817 kstat_named_t arcstat_l2_log_blk_writes; 818 /* 819 * Moving average of the aligned size of the L2ARC log blocks, in 820 * bytes. Updated during L2ARC rebuild and during writing of L2ARC 821 * log blocks. 822 */ 823 kstat_named_t arcstat_l2_log_blk_avg_asize; 824 /* Aligned size of L2ARC log blocks on L2ARC devices. */ 825 kstat_named_t arcstat_l2_log_blk_asize; 826 /* Number of L2ARC log blocks present on L2ARC devices. */ 827 kstat_named_t arcstat_l2_log_blk_count; 828 /* 829 * Moving average of the aligned size of L2ARC restored data, in bytes, 830 * to the aligned size of their metadata in L2ARC, in bytes. 831 * Updated during L2ARC rebuild and during writing of L2ARC log blocks. 832 */ 833 kstat_named_t arcstat_l2_data_to_meta_ratio; 834 /* 835 * Number of times the L2ARC rebuild was successful for an L2ARC device. 836 */ 837 kstat_named_t arcstat_l2_rebuild_success; 838 /* 839 * Number of times the L2ARC rebuild failed because the device header 840 * was in an unsupported format or corrupted. 841 */ 842 kstat_named_t arcstat_l2_rebuild_abort_unsupported; 843 /* 844 * Number of times the L2ARC rebuild failed because of IO errors 845 * while reading a log block. 846 */ 847 kstat_named_t arcstat_l2_rebuild_abort_io_errors; 848 /* 849 * Number of times the L2ARC rebuild failed because of IO errors when 850 * reading the device header. 851 */ 852 kstat_named_t arcstat_l2_rebuild_abort_dh_errors; 853 /* 854 * Number of L2ARC log blocks which failed to be restored due to 855 * checksum errors. 856 */ 857 kstat_named_t arcstat_l2_rebuild_abort_cksum_lb_errors; 858 /* 859 * Number of times the L2ARC rebuild was aborted due to low system 860 * memory. 861 */ 862 kstat_named_t arcstat_l2_rebuild_abort_lowmem; 863 /* Logical size of L2ARC restored data, in bytes. */ 864 kstat_named_t arcstat_l2_rebuild_size; 865 /* Aligned size of L2ARC restored data, in bytes. */ 866 kstat_named_t arcstat_l2_rebuild_asize; 867 /* 868 * Number of L2ARC log entries (buffers) that were successfully 869 * restored in ARC. 870 */ 871 kstat_named_t arcstat_l2_rebuild_bufs; 872 /* 873 * Number of L2ARC log entries (buffers) already cached in ARC. These 874 * were not restored again. 875 */ 876 kstat_named_t arcstat_l2_rebuild_bufs_precached; 877 /* 878 * Number of L2ARC log blocks that were restored successfully. Each 879 * log block may hold up to L2ARC_LOG_BLK_MAX_ENTRIES buffers. 880 */ 881 kstat_named_t arcstat_l2_rebuild_log_blks; 882 kstat_named_t arcstat_memory_throttle_count; 883 kstat_named_t arcstat_memory_direct_count; 884 kstat_named_t arcstat_memory_indirect_count; 885 kstat_named_t arcstat_memory_all_bytes; 886 kstat_named_t arcstat_memory_free_bytes; 887 kstat_named_t arcstat_memory_available_bytes; 888 kstat_named_t arcstat_no_grow; 889 kstat_named_t arcstat_tempreserve; 890 kstat_named_t arcstat_loaned_bytes; 891 kstat_named_t arcstat_prune; 892 kstat_named_t arcstat_meta_used; 893 kstat_named_t arcstat_dnode_limit; 894 kstat_named_t arcstat_async_upgrade_sync; 895 /* Number of predictive prefetch requests. */ 896 kstat_named_t arcstat_predictive_prefetch; 897 /* Number of requests for which predictive prefetch has completed. */ 898 kstat_named_t arcstat_demand_hit_predictive_prefetch; 899 /* Number of requests for which predictive prefetch was running. */ 900 kstat_named_t arcstat_demand_iohit_predictive_prefetch; 901 /* Number of prescient prefetch requests. */ 902 kstat_named_t arcstat_prescient_prefetch; 903 /* Number of requests for which prescient prefetch has completed. */ 904 kstat_named_t arcstat_demand_hit_prescient_prefetch; 905 /* Number of requests for which prescient prefetch was running. */ 906 kstat_named_t arcstat_demand_iohit_prescient_prefetch; 907 kstat_named_t arcstat_need_free; 908 kstat_named_t arcstat_sys_free; 909 kstat_named_t arcstat_raw_size; 910 kstat_named_t arcstat_cached_only_in_progress; 911 kstat_named_t arcstat_abd_chunk_waste_size; 912 } arc_stats_t; 913 914 typedef struct arc_sums { 915 wmsum_t arcstat_hits; 916 wmsum_t arcstat_iohits; 917 wmsum_t arcstat_misses; 918 wmsum_t arcstat_demand_data_hits; 919 wmsum_t arcstat_demand_data_iohits; 920 wmsum_t arcstat_demand_data_misses; 921 wmsum_t arcstat_demand_metadata_hits; 922 wmsum_t arcstat_demand_metadata_iohits; 923 wmsum_t arcstat_demand_metadata_misses; 924 wmsum_t arcstat_prefetch_data_hits; 925 wmsum_t arcstat_prefetch_data_iohits; 926 wmsum_t arcstat_prefetch_data_misses; 927 wmsum_t arcstat_prefetch_metadata_hits; 928 wmsum_t arcstat_prefetch_metadata_iohits; 929 wmsum_t arcstat_prefetch_metadata_misses; 930 wmsum_t arcstat_mru_hits; 931 wmsum_t arcstat_mru_ghost_hits; 932 wmsum_t arcstat_mfu_hits; 933 wmsum_t arcstat_mfu_ghost_hits; 934 wmsum_t arcstat_uncached_hits; 935 wmsum_t arcstat_deleted; 936 wmsum_t arcstat_mutex_miss; 937 wmsum_t arcstat_access_skip; 938 wmsum_t arcstat_evict_skip; 939 wmsum_t arcstat_evict_not_enough; 940 wmsum_t arcstat_evict_l2_cached; 941 wmsum_t arcstat_evict_l2_eligible; 942 wmsum_t arcstat_evict_l2_eligible_mfu; 943 wmsum_t arcstat_evict_l2_eligible_mru; 944 wmsum_t arcstat_evict_l2_ineligible; 945 wmsum_t arcstat_evict_l2_skip; 946 wmsum_t arcstat_hash_elements; 947 wmsum_t arcstat_hash_collisions; 948 wmsum_t arcstat_hash_chains; 949 aggsum_t arcstat_size; 950 wmsum_t arcstat_compressed_size; 951 wmsum_t arcstat_uncompressed_size; 952 wmsum_t arcstat_overhead_size; 953 wmsum_t arcstat_hdr_size; 954 wmsum_t arcstat_data_size; 955 wmsum_t arcstat_metadata_size; 956 wmsum_t arcstat_dbuf_size; 957 wmsum_t arcstat_dnode_size; 958 wmsum_t arcstat_bonus_size; 959 wmsum_t arcstat_l2_hits; 960 wmsum_t arcstat_l2_misses; 961 wmsum_t arcstat_l2_prefetch_asize; 962 wmsum_t arcstat_l2_mru_asize; 963 wmsum_t arcstat_l2_mfu_asize; 964 wmsum_t arcstat_l2_bufc_data_asize; 965 wmsum_t arcstat_l2_bufc_metadata_asize; 966 wmsum_t arcstat_l2_feeds; 967 wmsum_t arcstat_l2_rw_clash; 968 wmsum_t arcstat_l2_read_bytes; 969 wmsum_t arcstat_l2_write_bytes; 970 wmsum_t arcstat_l2_writes_sent; 971 wmsum_t arcstat_l2_writes_done; 972 wmsum_t arcstat_l2_writes_error; 973 wmsum_t arcstat_l2_writes_lock_retry; 974 wmsum_t arcstat_l2_evict_lock_retry; 975 wmsum_t arcstat_l2_evict_reading; 976 wmsum_t arcstat_l2_evict_l1cached; 977 wmsum_t arcstat_l2_free_on_write; 978 wmsum_t arcstat_l2_abort_lowmem; 979 wmsum_t arcstat_l2_cksum_bad; 980 wmsum_t arcstat_l2_io_error; 981 wmsum_t arcstat_l2_lsize; 982 wmsum_t arcstat_l2_psize; 983 aggsum_t arcstat_l2_hdr_size; 984 wmsum_t arcstat_l2_log_blk_writes; 985 wmsum_t arcstat_l2_log_blk_asize; 986 wmsum_t arcstat_l2_log_blk_count; 987 wmsum_t arcstat_l2_rebuild_success; 988 wmsum_t arcstat_l2_rebuild_abort_unsupported; 989 wmsum_t arcstat_l2_rebuild_abort_io_errors; 990 wmsum_t arcstat_l2_rebuild_abort_dh_errors; 991 wmsum_t arcstat_l2_rebuild_abort_cksum_lb_errors; 992 wmsum_t arcstat_l2_rebuild_abort_lowmem; 993 wmsum_t arcstat_l2_rebuild_size; 994 wmsum_t arcstat_l2_rebuild_asize; 995 wmsum_t arcstat_l2_rebuild_bufs; 996 wmsum_t arcstat_l2_rebuild_bufs_precached; 997 wmsum_t arcstat_l2_rebuild_log_blks; 998 wmsum_t arcstat_memory_throttle_count; 999 wmsum_t arcstat_memory_direct_count; 1000 wmsum_t arcstat_memory_indirect_count; 1001 wmsum_t arcstat_prune; 1002 wmsum_t arcstat_meta_used; 1003 wmsum_t arcstat_async_upgrade_sync; 1004 wmsum_t arcstat_predictive_prefetch; 1005 wmsum_t arcstat_demand_hit_predictive_prefetch; 1006 wmsum_t arcstat_demand_iohit_predictive_prefetch; 1007 wmsum_t arcstat_prescient_prefetch; 1008 wmsum_t arcstat_demand_hit_prescient_prefetch; 1009 wmsum_t arcstat_demand_iohit_prescient_prefetch; 1010 wmsum_t arcstat_raw_size; 1011 wmsum_t arcstat_cached_only_in_progress; 1012 wmsum_t arcstat_abd_chunk_waste_size; 1013 } arc_sums_t; 1014 1015 typedef struct arc_evict_waiter { 1016 list_node_t aew_node; 1017 kcondvar_t aew_cv; 1018 uint64_t aew_count; 1019 } arc_evict_waiter_t; 1020 1021 #define ARCSTAT(stat) (arc_stats.stat.value.ui64) 1022 1023 #define ARCSTAT_INCR(stat, val) \ 1024 wmsum_add(&arc_sums.stat, (val)) 1025 1026 #define ARCSTAT_BUMP(stat) ARCSTAT_INCR(stat, 1) 1027 #define ARCSTAT_BUMPDOWN(stat) ARCSTAT_INCR(stat, -1) 1028 1029 #define arc_no_grow ARCSTAT(arcstat_no_grow) /* do not grow cache size */ 1030 #define arc_meta ARCSTAT(arcstat_meta) /* target frac of metadata */ 1031 #define arc_pd ARCSTAT(arcstat_pd) /* target frac of data MRU */ 1032 #define arc_pm ARCSTAT(arcstat_pm) /* target frac of meta MRU */ 1033 #define arc_c ARCSTAT(arcstat_c) /* target size of cache */ 1034 #define arc_c_min ARCSTAT(arcstat_c_min) /* min target cache size */ 1035 #define arc_c_max ARCSTAT(arcstat_c_max) /* max target cache size */ 1036 #define arc_sys_free ARCSTAT(arcstat_sys_free) /* target system free bytes */ 1037 1038 #define arc_anon (&ARC_anon) 1039 #define arc_mru (&ARC_mru) 1040 #define arc_mru_ghost (&ARC_mru_ghost) 1041 #define arc_mfu (&ARC_mfu) 1042 #define arc_mfu_ghost (&ARC_mfu_ghost) 1043 #define arc_l2c_only (&ARC_l2c_only) 1044 #define arc_uncached (&ARC_uncached) 1045 1046 extern taskq_t *arc_prune_taskq; 1047 extern arc_stats_t arc_stats; 1048 extern arc_sums_t arc_sums; 1049 extern hrtime_t arc_growtime; 1050 extern boolean_t arc_warm; 1051 extern uint_t arc_grow_retry; 1052 extern uint_t arc_no_grow_shift; 1053 extern uint_t arc_shrink_shift; 1054 extern kmutex_t arc_prune_mtx; 1055 extern list_t arc_prune_list; 1056 extern arc_state_t ARC_mfu; 1057 extern arc_state_t ARC_mru; 1058 extern uint_t zfs_arc_pc_percent; 1059 extern uint_t arc_lotsfree_percent; 1060 extern uint64_t zfs_arc_min; 1061 extern uint64_t zfs_arc_max; 1062 1063 extern uint64_t arc_reduce_target_size(uint64_t to_free); 1064 extern boolean_t arc_reclaim_needed(void); 1065 extern void arc_kmem_reap_soon(void); 1066 extern void arc_wait_for_eviction(uint64_t, boolean_t, boolean_t); 1067 1068 extern void arc_lowmem_init(void); 1069 extern void arc_lowmem_fini(void); 1070 extern int arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg); 1071 extern uint64_t arc_free_memory(void); 1072 extern int64_t arc_available_memory(void); 1073 extern void arc_tuning_update(boolean_t); 1074 extern void arc_register_hotplug(void); 1075 extern void arc_unregister_hotplug(void); 1076 1077 extern int param_set_arc_u64(ZFS_MODULE_PARAM_ARGS); 1078 extern int param_set_arc_int(ZFS_MODULE_PARAM_ARGS); 1079 extern int param_set_arc_min(ZFS_MODULE_PARAM_ARGS); 1080 extern int param_set_arc_max(ZFS_MODULE_PARAM_ARGS); 1081 1082 /* used in zdb.c */ 1083 boolean_t l2arc_log_blkptr_valid(l2arc_dev_t *dev, 1084 const l2arc_log_blkptr_t *lbp); 1085 1086 /* used in vdev_trim.c */ 1087 void l2arc_dev_hdr_update(l2arc_dev_t *dev); 1088 l2arc_dev_t *l2arc_vdev_get(vdev_t *vd); 1089 1090 #ifdef __cplusplus 1091 } 1092 #endif 1093 1094 #endif /* _SYS_ARC_IMPL_H */ 1095