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e5db313494
freebsd-nq/include/sys
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Brian Behlendorf e5db313494
Linux 5.0 compat: SIMD compatibility 
Restore the SIMD optimization for 4.19.38 LTS, 4.14.120 LTS,
and 5.0 and newer kernels.  This is accomplished by leveraging
the fact that by definition dedicated kernel threads never need
to concern themselves with saving and restoring the user FPU state.
Therefore, they may use the FPU as long as we can guarantee user
tasks always restore their FPU state before context switching back
to user space.

For the 5.0 and 5.1 kernels disabling preemption and local
interrupts is sufficient to allow the FPU to be used.  All non-kernel
threads will restore the preserved user FPU state.

For 5.2 and latter kernels the user FPU state restoration will be
skipped if the kernel determines the registers have not changed.
Therefore, for these kernels we need to perform the additional
step of saving and restoring the FPU registers.  Invalidating the
per-cpu global tracking the FPU state would force a restore but
that functionality is private to the core x86 FPU implementation
and unavailable.

In practice, restricting SIMD to kernel threads is not a major
restriction for ZFS.  The vast majority of SIMD operations are
already performed by the IO pipeline.  The remaining cases are
relatively infrequent and can be handled by the generic code
without significant impact.  The two most noteworthy cases are:

  1) Decrypting the wrapping key for an encrypted dataset,
     i.e. `zfs load-key`.  All other encryption and decryption
     operations will use the SIMD optimized implementations.

  2) Generating the payload checksums for a `zfs send` stream.

In order to avoid making any changes to the higher layers of ZFS
all of the `*_get_ops()` functions were updated to take in to
consideration the calling context.  This allows for the fastest
implementation to be used as appropriate (see kfpu_allowed()).

The only other notable instance of SIMD operations being used
outside a kernel thread was at module load time.  This code
was moved in to a taskq in order to accommodate the new kernel
thread restriction.

Finally, a few other modifications were made in order to further
harden this code and facilitate testing.  They include updating
each implementations operations structure to be declared as a
constant.  And allowing "cycle" to be set when selecting the
preferred ops in the kernel as well as user space.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8754 
Closes #8793 
Closes #8965
2019-07-12 09:31:20 -07:00
..
crypto Add support for selecting encryption backend 2018-08-02 11:59:24 -07:00
fm Add zpool status -s (slow I/Os) and -p (parseable) 2018-11-08 16:47:24 -08:00
fs Fix zfs "redact" misc issues 2019-07-05 16:38:17 -07:00
lua Fix coverity defects: zfs channel programs 2018-02-20 11:19:42 -08:00
sysevent Add TRIM support 2019-03-29 09:13:20 -07:00
abd.h single-chunk scatter ABDs can be treated as linear 2019-06-11 09:02:31 -07:00
aggsum.h OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
arc_impl.h Linux 4.19-rc3+ compat: Remove refcount_t compat 2018-09-26 10:29:26 -07:00
arc.h Linux 4.19-rc3+ compat: Remove refcount_t compat 2018-09-26 10:29:26 -07:00
avl_impl.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
avl.h Remove dead code from AVL tree 2017-10-05 19:28:00 -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 OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -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 Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
cityhash.h OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
dataset_kstats.h port async unlinked drain from illumos-nexenta 2019-02-12 10:41:15 -08:00
dbuf.h Decrease contention on dn_struct_rwlock 2019-07-08 13:18:50 -07:00
ddt.h Remove dedupditto functionality 2019-06-19 14:54:02 -07:00
dmu_impl.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_objset.h Pool allocation classes 2018-09-05 18:33:36 -07:00
dmu_recv.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_redact.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_send.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_traverse.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_tx.h Linux 4.19-rc3+ compat: Remove refcount_t compat 2018-09-26 10:29:26 -07:00
dmu_zfetch.h Decrease contention on dn_struct_rwlock 2019-07-08 13:18:50 -07:00
dmu.h Remove code for zfs remap 2019-06-24 16:44:01 -07:00
dnode.h Remove code for zfs remap 2019-06-24 16:44:01 -07:00
dsl_bookmark.h Fix comments on zfs_bookmark_phys 2019-06-22 16:32:26 -07:00
dsl_crypt.h Allow unencrypted children of encrypted datasets 2019-06-20 12:29:51 -07:00
dsl_dataset.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dsl_deadlist.h OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
dsl_deleg.h Remove code for zfs remap 2019-06-24 16:44:01 -07:00
dsl_destroy.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dsl_dir.h Remove code for zfs remap 2019-06-24 16:44:01 -07:00
dsl_pool.h port async unlinked drain from illumos-nexenta 2019-02-12 10:41:15 -08:00
dsl_prop.h Illumos 6171 - dsl_prop_unregister() slows down dataset eviction. 2016-01-12 10:53:12 -08:00
dsl_scan.h OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
dsl_synctask.h OpenZFS 9425 - channel programs can be interrupted 2019-06-22 16:51:46 -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
frame.h Suppress incorrect objtool warnings 2017-12-07 10:28:50 -08:00
hkdf.h Encryption patch follow-up 2017-10-11 16:54:48 -04:00
Makefile.am 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
metaslab_impl.h Add TRIM support 2019-03-29 09:13:20 -07:00
metaslab.h Allow metaslab to be unloaded even when not freed from 2019-06-06 19:10:43 -07:00
mmp.h MMP interval and fail_intervals in uberblock 2019-03-21 12:47:57 -07:00
mntent.h Make zfs mount according to relatime config in dataset 2016-04-05 18:55:59 -07:00
multilist.h Avoid extra taskq_dispatch() calls by DMU 2019-06-25 12:03:38 -07:00
note.h Update build system and packaging 2018-05-29 16:00:33 -07:00
nvpair_impl.h OpenZFS 9580 - Add a hash-table on top of nvlist to speed-up operations 2018-07-30 11:30:03 -07:00
nvpair.h Add new fnvlist_lookup_* functions 2018-10-03 15:30:55 -07:00
objlist.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -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 Rename range_tree_verify to range_tree_verify_not_present 2019-01-25 09:51:24 -08:00
refcount.h Add zfs_refcount_transfer_ownership_many() 2018-10-09 10:05:48 -07:00
rrwlock.h Linux 4.19-rc3+ compat: Remove refcount_t compat 2018-09-26 10:29:26 -07:00
sa_impl.h Linux 4.19-rc3+ compat: Remove refcount_t compat 2018-09-26 10:29:26 -07:00
sa.h Project Quota on ZFS 2018-02-13 14:54:54 -08:00
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_checkpoint.h Serialize ZTHR operations to eliminate races 2019-01-13 10:09:46 -08:00
spa_checksum.h Implementation of AVX2 optimized Fletcher-4 2016-06-02 14:30:51 -07:00
spa_impl.h Remove dedupditto functionality 2019-06-19 14:54:02 -07:00
spa.h Fix bp_embedded_type enum definition 2019-06-24 18:02:17 -07:00
space_map.h Introduce auxiliary metaslab histograms 2019-02-20 09:59:56 -08:00
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 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_arc.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_common.h OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
trace_dbgmsg.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_dbuf.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_dmu.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_dnode.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_multilist.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_rrwlock.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_txg.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_vdev.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_zil.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_zio.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_zrlock.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
txg_impl.h OpenZFS 9464 - txg_kick() fails to see that we are quiescing 2018-06-04 14:56:06 -07:00
txg.h OpenZFS 9425 - channel programs can be interrupted 2019-06-22 16:51:46 -07:00
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 MMP interval and fail_intervals in uberblock 2019-03-21 12:47:57 -07:00
uberblock.h Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00
uio_impl.h deadlock between mm_sem and tx assign in zfs_write() and page fault 2018-10-16 11:11:24 -07:00
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 Add support for autoexpand property 2018-07-23 15:40:15 -07:00
vdev_file.h Use a dedicated taskq for vdev_file 2016-12-21 10:47:15 -08:00
vdev_impl.h Add TRIM support 2019-03-29 09:13:20 -07:00
vdev_indirect_births.h OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
vdev_indirect_mapping.h OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
vdev_initialize.h Add TRIM support 2019-03-29 09:13:20 -07:00
vdev_raidz_impl.h Linux 5.0 compat: SIMD compatibility 2019-07-12 09:31:20 -07:00
vdev_raidz.h Linux 5.0 compat: SIMD compatibility 2019-07-12 09:31:20 -07:00
vdev_removal.h panic in removal_remap test on 4K devices 2019-06-13 13:12:39 -07:00
vdev_trim.h Add TRIM support 2019-03-29 09:13:20 -07:00
vdev.h Add TRIM support 2019-03-29 09:13:20 -07:00
xvattr.h Linux 4.18 compat: inode timespec -> timespec64 2018-06-19 21:51:18 -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 ..." 2018-04-18 14:19:50 -07:00
zap.h fat zap should prefetch when iterating 2019-06-12 13:13:09 -07:00
zcp_global.h OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
zcp_iter.h OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
zcp_prop.h OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
zcp.h OpenZFS 9425 - channel programs can be interrupted 2019-06-22 16:51:46 -07:00
zfeature.h Revert "zhack: Add 'feature disable' command" 2016-05-17 11:52:07 -07:00
zfs_acl.h Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_context.h OpenZFS 9425 - channel programs can be interrupted 2019-06-22 16:51:46 -07:00
zfs_ctldir.h Rename zfs_sb_t -> zfsvfs_t 2017-03-10 09:51:33 -08:00
zfs_debug.h Add TRIM support 2019-03-29 09:13:20 -07:00
zfs_delay.h Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_dir.h port async unlinked drain from illumos-nexenta 2019-02-12 10:41:15 -08:00
zfs_fuid.h Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_ioctl.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
zfs_onexit.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zfs_project.h Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_ratelimit.h Change checksum & IO delay ratelimit values 2018-03-04 17:34:51 -08:00
zfs_rlock.h OpenZFS 9689 - zfs range lock code should not be zpl-specific 2018-10-11 10:19:33 -07:00
zfs_sa.h Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_stat.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zfs_sysfs.h Fix in-kernel sysfs entries 2018-09-06 21:44:52 -07:00
zfs_vfsops.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
zfs_vnops.h RHEL 7.5 compat: FMODE_KABI_ITERATE 2018-05-02 15:01:24 -07:00
zfs_znode.h Fix zfs set atime|relatime=off|on behavior on inherited datasets 2019-05-07 10:06:30 -07:00
zil_impl.h make zil max block size tunable 2019-06-10 11:48:42 -07:00
zil.h make zil max block size tunable 2019-06-10 11:48:42 -07:00
zio_checksum.h Remove dependency on linear ABD 2017-03-29 12:24:51 -07:00
zio_compress.h lz4_decompress_abd declared but not defined 2019-06-13 13:14:34 -07:00
zio_crypt.h Add support for decryption faults in zinject 2018-05-02 15:36:20 -07:00
zio_impl.h Add TRIM support 2019-03-29 09:13:20 -07:00
zio_priority.h Add TRIM support 2019-03-29 09:13:20 -07:00
zio.h Remove dedupditto functionality 2019-06-19 14:54:02 -07:00
zpl.h Linux 4.18 compat: inode timespec -> timespec64 2018-06-19 21:51:18 -07:00
zrlock.h OpenZFS 6328 - Fix cstyle errors in zfs codebase 2017-01-12 09:42:11 -08:00
zthr.h Serialize ZTHR operations to eliminate races 2019-01-13 10:09:46 -08:00
zvol.h Add port of FreeBSD 'volmode' property 2017-07-12 13:05:37 -07:00