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Matthew Ahrens 45579c9515 Reduce taskq and context-switch cost of zio pipe 
When doing a read from disk, ZFS creates 3 ZIO's: a zio_null(), the
logical zio_read(), and then a physical zio. Currently, each of these
results in a separate taskq_dispatch(zio_execute).

On high-read-iops workloads, this causes a significant performance
impact. By processing all 3 ZIO's in a single taskq entry, we reduce the
overhead on taskq locking and context switching.  We accomplish this by
allowing zio_done() to return a "next zio to execute" to zio_execute().

This results in a ~12% performance increase for random reads, from
96,000 iops to 108,000 iops (with recordsize=8k, on SSD's).

Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: George Wilson <george.wilson@delphix.com>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
External-issue: DLPX-59292
Closes #7736
2018-11-08 14:38:28 -08:00
..
crypto
OpenZFS 4185 - add new cryptographic checksums to ZFS: SHA-512, Skein, Edon-R
2016-10-03 14:51:15 -07:00
fm
OpenZFS 6939 - add sysevents to zfs core for commands
2017-07-12 21:28:13 -07:00
fs
Report pool suspended due to MMP
2018-05-07 17:19:56 -07:00
sysevent
Emit history events for 'zpool create'
2017-12-04 17:21:03 -08:00
abd.h
OpenZFS 8416 - abd.h is not C++ friendly
2017-06-30 11:11:01 -07:00
arc_impl.h
OpenZFS 7968 - multi-threaded spa_sync()
2017-03-20 18:36:00 -07:00
arc.h
Fix ARC hit rate
2018-01-30 10:27:31 -06:00
avl_impl.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
avl.h
Performance optimization of AVL tree comparator functions
2016-08-31 14:35:34 -07:00
blkptr.h
OpenZFS 8067 - zdb should be able to dump literal embedded block pointer
2017-07-07 11:28:01 -07:00
bplist.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
bpobj.h
Illumos 5810 - zdb should print details of bpobj
2015-05-11 15:10:24 -07:00
bptree.h
Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t
2014-08-06 14:48:41 -07:00
bqueue.h
Illumos 5960, 5925
2016-01-08 15:08:19 -08:00
dbuf.h
OpenZFS 7531 - Assign correct flags to prefetched buffers
2017-11-21 13:11:29 -06:00
ddt.h
DLPX-44812 integrate EP-220 large memory scalability
2016-11-29 14:34:27 -08:00
dmu_impl.h
Fix race in dnode_check_slots_free()
2018-11-08 14:38:28 -08:00
dmu_objset.h
Linux 4.18 compat: inode timespec -> timespec64
2018-07-06 02:46:51 -07:00
dmu_send.h
Free objects when receiving full stream as clone
2017-10-16 10:57:55 -07:00
dmu_traverse.h
OpenZFS 2605, 6980, 6902
2016-06-28 13:47:02 -07:00
dmu_tx.h
OpenZFS 8997 - ztest assertion failure in zil_lwb_write_issue
2018-07-06 02:46:51 -07:00
dmu_zfetch.h
OpenZFS 6322 - ZFS indirect block predictive prefetch
2016-08-30 14:26:55 -07:00
dmu.h
OpenZFS 8997 - ztest assertion failure in zil_lwb_write_issue
2018-07-06 02:46:51 -07:00
dnode.h
Fix race in dnode_check_slots_free()
2018-11-08 14:38:28 -08:00
dsl_bookmark.h
Illumos 4368, 4369.
2014-07-29 10:55:29 -07:00
dsl_dataset.h
Typo in dsl_dataset.h
2017-10-17 16:49:03 -07:00
dsl_deadlist.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
dsl_deleg.h
Add support for user/group dnode accounting & quota
2016-10-07 09:45:13 -07:00
dsl_destroy.h
Illumos #3888
2013-11-04 11:18:14 -08:00
dsl_dir.h
Linux 4.18 compat: inode timespec -> timespec64
2018-07-06 02:46:51 -07:00
dsl_pool.h
Multi-modifier protection (MMP)
2017-07-13 13:54:00 -04:00
dsl_prop.h
Illumos 6171 - dsl_prop_unregister() slows down dataset eviction.
2016-01-12 10:53:12 -08:00
dsl_scan.h
Implemented zpool scrub pause/resume
2017-07-06 22:16:13 -07:00
dsl_synctask.h
Illumos 4951 - ZFS administrative commands should use reserved space
2015-05-04 09:41:10 -07:00
dsl_userhold.h
Illumos #3740
2013-11-04 11:17:48 -08:00
edonr.h
OpenZFS 4185 - add new cryptographic checksums to ZFS: SHA-512, Skein, Edon-R
2016-10-03 14:51:15 -07:00
efi_partition.h
Fix spelling
2017-01-03 11:31:18 -06:00
Makefile.am
Multi-modifier protection (MMP)
2017-07-13 13:54:00 -04:00
metaslab_impl.h
OpenZFS 7613 - ms_freetree[4] is only used in syncing context
2017-01-26 15:27:19 -08:00
metaslab.h
OpenZFS 7303 - dynamic metaslab selection
2017-01-12 11:52:56 -08:00
mmp.h
Record skipped MMP writes in multihost_history
2018-05-07 17:19:56 -07:00
mntent.h
Make zfs mount according to relatime config in dataset
2016-04-05 18:55:59 -07:00
multilist.h
OpenZFS 7968 - multi-threaded spa_sync()
2017-03-20 18:36:00 -07:00
nvpair_impl.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
nvpair.h
Replace __va_list with va_list
2014-08-13 10:35:00 -07:00
pathname.h
Add pn_alloc()/pn_free() functions
2016-04-21 09:49:25 -07:00
policy.h
Add zfs allow and zfs unallow support
2016-06-07 09:16:52 -07:00
range_tree.h
Illumos #4374
2014-07-30 09:20:35 -07:00
refcount.h
Linux 4.11 compat: avoid refcount_t name conflict
2017-02-28 16:10:18 -08:00
rrwlock.h
Illumos 5008 - lock contention (rrw_exit) while running a read only load
2015-07-06 09:34:13 -07:00
sa_impl.h
Implement large_dnode pool feature
2016-06-24 13:13:21 -07:00
sa.h
Remove unused sa_update_from_cb()
2016-12-01 16:39:06 -07:00
sdt.h
Add line info and SET_ERROR() to ZFS debug log
2017-07-25 23:09:48 -07:00
sha2.h
OpenZFS 4185 - add new cryptographic checksums to ZFS: SHA-512, Skein, Edon-R
2016-10-03 14:51:15 -07:00
skein.h
OpenZFS 4185 - add new cryptographic checksums to ZFS: SHA-512, Skein, Edon-R
2016-10-03 14:51:15 -07:00
spa_boot.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
spa_checksum.h
Implementation of AVX2 optimized Fletcher-4
2016-06-02 14:30:51 -07:00
spa_impl.h
Linux 4.18 compat: inode timespec -> timespec64
2018-07-06 02:46:51 -07:00
spa.h
Add pool state /proc entry, "SUSPENDED" pools
2018-07-06 02:46:51 -07:00
space_map.h
Illumos 5164-5165 - space map fixes
2014-10-23 15:30:32 -07:00
space_reftree.h
Illumos #4101, #4102, #4103, #4105, #4106
2014-07-22 09:39:16 -07:00
sysevent.h
OpenZFS 6939 - add sysevents to zfs core for commands
2017-07-12 21:28:13 -07:00
trace_acl.h
Linux 4.16 compat: inode_set_iversion()
2018-03-14 16:10:36 -07:00
trace_arc.h
Fix build-it compilation regression
2017-01-24 08:50:15 -08:00
trace_common.h
OpenZFS 6531 - Provide mechanism to artificially limit disk performance
2016-05-26 10:11:51 -07:00
trace_dbgmsg.h
Add line info and SET_ERROR() to ZFS debug log
2017-07-25 23:09:48 -07:00
trace_dbuf.h
Crash in dbuf_evict_one with DTRACE_PROBE
2017-08-21 16:41:22 -07:00
trace_dmu.h
tx_waited -> tx_dirty_delayed in trace_dmu.h
2018-09-13 10:12:22 -07:00
trace_dnode.h
Fix build-it compilation regression
2017-01-24 08:50:15 -08:00
trace_multilist.h
Fix build-it compilation regression
2017-01-24 08:50:15 -08:00
trace_txg.h
Fix build-it compilation regression
2017-01-24 08:50:15 -08:00
trace_zil.h
OpenZFS 7578 - Fix/improve some aspects of ZIL writing
2017-06-09 09:15:37 -07:00
trace_zio.h
Use cstyle -cpP in make cstyle check
2016-12-12 10:46:26 -08:00
trace_zrlock.h
Use cstyle -cpP in make cstyle check
2016-12-12 10:46:26 -08:00
trace.h
Remove duplicate typedefs from trace.h
2015-01-06 16:53:24 -08:00
txg_impl.h
Fix spelling
2017-01-03 11:31:18 -06:00
txg.h
OpenZFS 8063 - verify that we do not attempt to access inactive txg
2017-05-10 13:52:22 -04:00
u8_textprep_data.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
u8_textprep.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
uberblock_impl.h
OpenZFS 8491 - uberblock on-disk padding to reserve space for smoothly merging zpool checkpoint & MMP in ZFS
2017-07-24 13:47:51 -04:00
uberblock.h
Multi-modifier protection (MMP)
2017-07-13 13:54:00 -04:00
uio_impl.h
Add basic uio support
2011-02-10 09:21:43 -08:00
unique.h
Illumos #3742
2013-11-04 10:55:25 -08:00
uuid.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
vdev_disk.h
Revert "zpool reopen should detect expanded devices"
2018-09-13 10:11:42 -07:00
vdev_file.h
Use a dedicated taskq for vdev_file
2016-12-21 10:47:15 -08:00
vdev_impl.h
Change checksum & IO delay ratelimit values
2018-03-14 16:10:38 -07:00
vdev_raidz_impl.h
Revert raidz_map and _col structure types
2018-01-30 10:27:31 -06:00
vdev_raidz.h
Use cstyle -cpP in make cstyle check
2016-12-12 10:46:26 -08:00
vdev.h
vdev_mirror: load balancing fixes
2018-01-30 10:27:30 -06:00
xvattr.h
Linux 4.18 compat: inode timespec -> timespec64
2018-07-06 02:46:51 -07:00
zap_impl.h
OpenZFS 7793 - ztest fails assertion in dmu_tx_willuse_space
2017-03-07 09:51:59 -08:00
zap_leaf.h
Fix ENOSPC in "Handle zap_add() failures in ..."
2018-07-06 02:46:51 -07:00
zap.h
OpenZFS 1300 - filename normalization doesn't work for removes
2017-02-02 14:13:41 -08:00
zfeature.h
Revert "zhack: Add 'feature disable' command"
2016-05-17 11:52:07 -07:00
zfs_acl.h
Rename zfs_sb_t -> zfsvfs_t
2017-03-10 09:51:33 -08:00
zfs_context.h
Linux 4.18 compat: inode timespec -> timespec64
2018-07-06 02:46:51 -07:00
zfs_ctldir.h
Rename zfs_sb_t -> zfsvfs_t
2017-03-10 09:51:33 -08:00
zfs_debug.h
Add line info and SET_ERROR() to ZFS debug log
2017-07-25 23:09:48 -07:00
zfs_delay.h
cstyle: Resolve C style issues
2013-12-18 16:46:35 -08:00
zfs_dir.h
Rename zfs_sb_t -> zfsvfs_t
2017-03-10 09:51:33 -08:00
zfs_fuid.h
Rename zfs_sb_t -> zfsvfs_t
2017-03-10 09:51:33 -08:00
zfs_ioctl.h
Inject zinject(8) a percentage amount of dev errs
2017-06-16 17:21:11 -07:00
zfs_onexit.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
zfs_ratelimit.h
Change checksum & IO delay ratelimit values
2018-03-14 16:10:38 -07:00
zfs_rlock.h
Rename zfs_sb_t -> zfsvfs_t
2017-03-10 09:51:33 -08:00
zfs_sa.h
Illumos 5027 - zfs large block support
2015-05-11 12:23:16 -07:00
zfs_stat.h
Support custom build directories and move includes
2010-09-08 12:38:56 -07:00
zfs_vfsops.h
Fix zpl_mount() deadlock
2018-07-06 02:46:51 -07:00
zfs_vnops.h
RHEL 7.5 compat: FMODE_KABI_ITERATE
2018-05-07 17:19:57 -07:00
zfs_znode.h
Linux 4.18 compat: inode timespec -> timespec64
2018-07-06 02:46:51 -07:00
zil_impl.h
OpenZFS 7578 - Fix/improve some aspects of ZIL writing
2017-06-09 09:15:37 -07:00
zil.h
Preserve itx alloc size for zio_data_buf_free()
2017-12-04 17:21:39 -08:00
zio_checksum.h
Remove dependency on linear ABD
2017-03-29 12:24:51 -07:00
zio_compress.h
DLPX-44812 integrate EP-220 large memory scalability
2016-11-29 14:34:27 -08:00
zio_impl.h
Compile zio.h and zio_impl.h mutual include
2016-12-01 16:36:25 -07:00
zio_priority.h
Add -lhHpw options to "zpool iostat" for avg latency, histograms, & queues
2016-05-12 12:36:32 -07:00
zio.h
Reduce taskq and context-switch cost of zio pipe
2018-11-08 14:38:28 -08:00
zpl.h
Linux 4.18 compat: inode timespec -> timespec64
2018-07-06 02:46:51 -07:00
zrlock.h
OpenZFS 6328 - Fix cstyle errors in zfs codebase
2017-01-12 09:42:11 -08:00
zvol.h
Add port of FreeBSD 'volmode' property
2017-07-12 13:05:37 -07:00