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Alexander Motin 755065f3dc OpenZFS 6322 - ZFS indirect block predictive prefetch 
For quite some time I was thinking about possibility to prefetch
ZFS indirection tables while doing sequential reads or writes.
Recent changes in predictive prefetcher made that much easier to
do. My tests on zvol with 16KB block size on 5x striped and 2x
mirrored pool of 10 disks show almost double throughput on sequential
read, and almost tripple on sequential rewrite. While for read alike
effect can be received from increasing maximal prefetch distance
(though at higher memory cost), for rewrite there is no other
solution so far.

Authored by: Alexander Motin <mav@freebsd.org>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported-by: kernelOfTruth kerneloftruth@gmail.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/6322
OpenZFS-commit: https://github.com/illumos/illumos-gate/commit/cb92f413
Closes #5040

Porting notes:
- Change from upstream in module/zfs/dbuf.c in 'int dbuf_read' due
  to commit 5f6d0b6 'Handle block pointers with a corrupt logical size'

- Difference from upstream in module/zfs/dmu_zfetch.c,
  uint32_t zfetch_max_idistance -> unsigned int zfetch_max_idistance

- Variables have been initialized at the beginning of the function
 (void dmu_zfetch) to resemble the order of occurrence and account
 for C99, C11 mode errors.
2016-08-30 14:26:55 -07:00
..
arc.c Add zfs_arc_meta_limit_percent tunable 2016-08-23 13:03:01 -07:00
blkptr.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
bplist.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
bpobj.c Illumos 5810 - zdb should print details of bpobj 2015-05-11 15:10:24 -07:00
bptree.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
bqueue.c Allow 16M send/recv blocks 2016-01-08 20:23:23 -05:00
dbuf_stats.c Fix dbuf_stats_hash_table_data race 2016-07-14 16:25:04 -07:00
dbuf.c OpenZFS 6322 - ZFS indirect block predictive prefetch 2016-08-30 14:26:55 -07:00
ddt_zap.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
ddt.c Handle zap_lookup() failure in ddt_object_load() 2015-08-19 14:32:50 -07:00
dmu_diff.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
dmu_object.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
dmu_objset.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dmu_send.c Prevent reclaim in send_traverse_thread() 2016-08-22 16:12:05 -07:00
dmu_traverse.c Add tunable to ignore hole_birth 2016-08-15 09:52:56 -07:00
dmu_tx.c OpenZFS 7004 - dmu_tx_hold_zap() does dnode_hold() 7x on same object 2016-08-19 12:48:03 -07:00
dmu_zfetch.c OpenZFS 6322 - ZFS indirect block predictive prefetch 2016-08-30 14:26:55 -07:00
dmu.c OpenZFS 6322 - ZFS indirect block predictive prefetch 2016-08-30 14:26:55 -07:00
dnode_sync.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
dnode.c Limit the amount of dnode metadata in the ARC 2016-07-25 15:26:38 -07:00
dsl_bookmark.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_dataset.c Rework of fletcher_4 module 2016-08-16 14:11:55 -07:00
dsl_deadlist.c Handle damaged blk_birth in dsl_deadlist_insert() 2015-12-15 16:12:31 -08:00
dsl_deleg.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_destroy.c OpenZFS 2605, 6980, 6902 2016-06-28 13:47:02 -07:00
dsl_dir.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_pool.c Fix self-healing IO prior to dsl_pool_init() completion 2016-05-27 14:11:25 -07:00
dsl_prop.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_scan.c OpenZFS 5997 - FRU field not set during pool creation and never updated 2016-08-12 13:06:48 -07:00
dsl_synctask.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_userhold.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
fm.c Fix indefinite article 2016-08-11 11:23:49 -07:00
gzip.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
lz4.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
lzjb.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
Makefile.in Add RAID-Z routines for SSE2 instruction set, in x86_64 mode. 2016-07-13 10:24:55 -07:00
metaslab.c Fix gcc self-comparison warning 2016-08-02 13:14:18 -07:00
multilist.c Identify locks flagged by lockdep 2015-12-22 10:21:33 -08:00
pathname.c Add pn_alloc()/pn_free() functions 2016-04-21 09:49:25 -07:00
policy.c Fix NFS credential 2016-06-21 09:58:37 -07:00
range_tree.c Illumos 5163 - arc should reap range_seg_cache 2015-06-25 08:58:16 -07:00
refcount.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
rrwlock.c Illumos 5008 - lock contention (rrw_exit) while running a read only load 2015-07-06 09:34:13 -07:00
sa.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
sha256.c Add linux sha2 support 2010-08-31 13:41:59 -07:00
spa_boot.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_config.c OpenZFS 5997 - FRU field not set during pool creation and never updated 2016-08-12 13:06:48 -07:00
spa_errlog.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
spa_history.c Fix indefinite article 2016-08-11 11:23:49 -07:00
spa_misc.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
spa_stats.c Illumos 5369 - arc flags should be an enum 2015-06-11 10:27:25 -07:00
spa.c Fix spa config generate memory leak in spa_load_best function 2016-08-19 11:17:12 -07:00
space_map.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
space_reftree.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
trace.c OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
txg.c txg visibility code should not execute under tc_open_lock 2016-07-27 14:11:13 -07:00
uberblock.c Illumos 5347 - idle pool may run itself out of space 2015-07-14 10:35:21 -07:00
unique.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
vdev_cache.c Illumos 5045 - use atomic_{inc,dec}_* instead of atomic_add_* 2016-01-15 15:38:36 -08:00
vdev_disk.c Remove custom root pool import code 2016-08-11 11:19:34 -07:00
vdev_file.c OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
vdev_label.c Fix memleak in vdev_config_generate_stats 2016-05-31 16:05:21 -07:00
vdev_mirror.c FreeBSD r256956: Improve ZFS N-way mirror read performance by using load and locality information. 2016-02-26 11:24:35 -08:00
vdev_missing.c Illumos #5244 - zio pipeline callers should explicitly invoke next stage 2015-04-30 15:07:47 -07:00
vdev_queue.c Fix self-healing IO prior to dsl_pool_init() completion 2016-05-27 14:11:25 -07:00
vdev_raidz_math_avx2.c Fixes and enhancements of SIMD raidz parity 2016-07-19 16:43:07 -07:00
vdev_raidz_math_impl.h SIMD implementation of vdev_raidz generate and reconstruct routines 2016-06-21 09:27:26 -07:00
vdev_raidz_math_scalar.c Fixes and enhancements of SIMD raidz parity 2016-07-19 16:43:07 -07:00
vdev_raidz_math_sse2.c Add RAID-Z routines for SSE2 instruction set, in x86_64 mode. 2016-07-13 10:24:55 -07:00
vdev_raidz_math_ssse3.c Fixes and enhancements of SIMD raidz parity 2016-07-19 16:43:07 -07:00
vdev_raidz_math.c Linux compat: Grsecurity kernel 2016-08-22 10:05:45 -07:00
vdev_raidz.c Build user-space with different gcc optimization levels 2016-08-09 14:40:35 -07:00
vdev_root.c Illumos #3598 2013-10-31 14:58:04 -07:00
vdev.c Fix incorrect pool state after import 2016-08-12 13:46:51 -07:00
zap_leaf.c Illumos 5314 - Remove "dbuf phys" db->db_data pointer aliases in ZFS 2015-04-28 16:25:20 -07:00
zap_micro.c OpenZFS 7004 - dmu_tx_hold_zap() does dnode_hold() 7x on same object 2016-08-19 12:48:03 -07:00
zap.c OpenZFS 7004 - dmu_tx_hold_zap() does dnode_hold() 7x on same object 2016-08-19 12:48:03 -07:00
zfeature_common.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
zfeature.c Revert "zhack: Add 'feature disable' command" 2016-05-17 11:52:07 -07:00
zfs_acl.c Fix interaction between userns uid/gid and SA 2016-08-08 10:47:43 -07:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_ctldir.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_debug.c Add dbgmsg kstat 2015-09-04 16:08:14 -07:00
zfs_dir.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_fm.c OpenZFS 5997 - FRU field not set during pool creation and never updated 2016-08-12 13:06:48 -07:00
zfs_fuid.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_ioctl.c Fix zfs_allow_log_destroy() NULL dereference 2016-07-29 15:34:12 -07:00
zfs_log.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_onexit.c zfsdev_getminor() should check for invalid file handles 2015-06-22 17:02:13 -07:00
zfs_replay.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
zfs_rlock.c Remove dummy znode from zvol_state 2016-05-17 10:29:02 -07:00
zfs_sa.c Use native inode->i_nlink instead of znode->z_links 2016-07-14 16:25:34 -07:00
zfs_vfsops.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_vnops.c Fix interaction between userns uid/gid and SA 2016-08-08 10:47:43 -07:00
zfs_znode.c Move assignment of i_blkbits field 2016-07-29 15:34:12 -07:00
zil.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
zio_checksum.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
zio_compress.c Illumos 5661 - ZFS: "compression = on" should use lz4 if feature is enabled 2015-07-10 12:11:45 -07:00
zio_inject.c OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
zio.c Fix zdb crash with 4K-only devices 2016-07-27 13:38:46 -07:00
zle.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zpl_ctldir.c Use file_dentry and file_inode wrappers 2016-08-11 12:06:37 -07:00
zpl_export.c zfsctl: No need to sync ctldir inodes 2015-08-31 13:54:39 -07:00
zpl_file.c Use file_dentry and file_inode wrappers 2016-08-11 12:06:37 -07:00
zpl_inode.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
zpl_super.c Fix memleak in zpl_parse_options 2016-05-31 16:04:26 -07:00
zpl_xattr.c Linux 4.7 compat: fix zpl_get_acl returns invalid acl pointer 2016-08-09 10:03:04 -07:00
zrlock.c Illumos 5812 - assertion failed in zrl_tryenter(): zr_owner==NULL 2015-04-30 14:43:40 -07:00
zvol.c Linux 4.8 compat: Fix removal of bio->bi_rw member 2016-08-11 11:19:34 -07:00