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ee36c709c3
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Gvozden Neskovic ee36c709c3 Performance optimization of AVL tree comparator functions 
perf: 2.75x faster ddt_entry_compare()
    First 256bits of ddt_key_t is a block checksum, which are expected
to be close to random data. Hence, on average, comparison only needs to
look at first few bytes of the keys. To reduce number of conditional
jump instructions, the result is computed as: sign(memcmp(k1, k2)).

Sign of an integer 'a' can be obtained as: `(0 < a) - (a < 0)` := {-1, 0, 1} ,
which is computed efficiently.  Synthetic performance evaluation of
original and new algorithm over 1G random keys on 2.6GHz Intel(R) Xeon(R)
CPU E5-2660 v3:

old	6.85789 s
new	2.49089 s

perf: 2.8x faster vdev_queue_offset_compare() and vdev_queue_timestamp_compare()
    Compute the result directly instead of using conditionals

perf: zfs_range_compare()
    Speedup between 1.1x - 2.5x, depending on compiler version and
optimization level.

perf: spa_error_entry_compare()
    `bcmp()` is not suitable for comparator use. Use `memcmp()` instead.

perf: 2.8x faster metaslab_compare() and metaslab_rangesize_compare()
perf: 2.8x faster zil_bp_compare()
perf: 2.8x faster mze_compare()
perf: faster dbuf_compare()
perf: faster compares in spa_misc
perf: 2.8x faster layout_hash_compare()
perf: 2.8x faster space_reftree_compare()
perf: libzfs: faster avl tree comparators
perf: guid_compare()
perf: dsl_deadlist_compare()
perf: perm_set_compare()
perf: 2x faster range_tree_seg_compare()
perf: faster unique_compare()
perf: faster vdev_cache _compare()
perf: faster vdev_uberblock_compare()
perf: faster fuid _compare()
perf: faster zfs_znode_hold_compare()

Signed-off-by: Gvozden Neskovic <neskovic@gmail.com>
Signed-off-by: Richard Elling <richard.elling@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #5033
2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
dsl_deleg.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Delete unused zfsctl_snapdir_inactive declaration 2016-08-30 14:33:40 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
spa_stats.c Illumos 5369 - arc flags should be an enum 2015-06-11 10:27:25 -07:00
spa.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
space_map.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
space_reftree.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
vdev_cache.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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 OpenZFS 6940 - Cannot unlink directories when over quota 2016-08-30 14:33:04 -07:00
zfs_znode.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
zil.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -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