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82e3117095
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Alexander Motin 82e3117095 Optimize microzaps 
Microzap on-disk format does not include a hash tree, expecting one to
be built in RAM during mzap_open().  The built tree is linked to DMU
user buffer, freed when original DMU buffer is dropped from cache. I've
found that workloads accessing many large directories and having active
eviction from DMU cache spend significant amount of time building and
then destroying the trees.  I've also found that for each 64 byte mzap
element additional 64 byte tree element is allocated, that is a waste
of memory and CPU caches.

Improve memory efficiency of the hash tree by switching from AVL-tree
to B-tree.  It allows to save 24 bytes per element just on pointers.
Save 32 bits on mze_hash by storing only upper 32 bits since lower 32
bits are always zero for microzaps.  Save 16 bits on mze_chunkid, since
microzap can never have so many elements.  Respectively with the 16 bits
there can be no more than 16 bits of collision differentiators.  As
result, struct mzap_ent now drops from 48 (rounded to 64) to 8 bytes.

Tune B-trees for small data.  Reduce BTREE_CORE_ELEMS from 128 to 126
to allow struct zfs_btree_core in case of 8 byte elements to pack into
2KB instead of 4KB.  Aside of the microzaps it should also help 32bit
range trees.  Allow custom B-tree leaf size to reduce memmove() time.

Split zap_name_alloc() into zap_name_alloc() and zap_name_init_str().
It allows to not waste time allocating/freeing memory when processing
multiple names in a loop during mzap_open().

Together on a pool with 10K directories of 1800 files each and DMU
cache limited to 128MB this reduces time of `find . -name zzz` by 41%
from 7.63s to 4.47s, and saves additional ~30% of CPU time on the DMU
cache reclamation.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #14039

(cherry picked from commit 9dcdee7889)
2023-03-02 14:37:07 -08:00
..
abd.c Avoid small buffer copying on write 2022-07-26 10:10:37 -07:00
aggsum.c More aggsum optimizations 2021-06-09 13:05:34 -07:00
arc.c Fix arc_p aggressive increase 2022-12-01 12:39:43 -08:00
blkptr.c Add zstd support to zfs 2020-08-20 10:30:06 -07:00
bplist.c Fast Clone Deletion 2019-07-26 10:54:14 -07:00
bpobj.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
bptree.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
bqueue.c zfs recv hangs if max recordsize is less than received recordsize 2022-09-19 09:39:07 -07:00
btree.c Optimize microzaps 2023-03-02 14:37:07 -08:00
dataset_kstats.c Introduce write-mostly sums 2021-06-09 13:05:34 -07:00
dbuf_stats.c Revert "Reduce dbuf_find() lock contention" 2022-09-21 13:15:51 -07:00
dbuf.c Fix NULL pointer dereference in dbuf_prefetch_indirect_done() 2022-12-01 12:39:44 -08:00
ddt_zap.c Refactor dnode dirty context from dbuf_dirty 2020-02-26 16:09:17 -08:00
ddt.c Tinker with slop space accounting with dedup 2021-09-14 12:38:05 -07:00
dmu_diff.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
dmu_object.c Introduce CPU_SEQID_UNSTABLE 2020-11-02 11:51:12 -08:00
dmu_objset.c Move dmu_buf_rele() after dsl_dataset_sync_done() 2023-03-01 09:36:19 -08:00
dmu_recv.c Deny receiving into encrypted datasets if the keys are not loaded (#14139) 2022-11-04 11:07:29 -07:00
dmu_redact.c Fix incorrect size given to bqueue_enqueue() call in dmu_redact.c 2022-09-21 13:15:51 -07:00
dmu_send.c Fix a race condition in dsl_dataset_sync() when activating features 2023-03-01 09:36:19 -08:00
dmu_traverse.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
dmu_tx.c Refactor Log Size Limit 2022-09-26 14:55:27 -07:00
dmu_zfetch.c More speculative prefetcher improvements 2022-07-26 10:10:37 -07:00
dmu.c Bring per_txg_dirty_frees_percent back to 30 2022-11-01 12:32:40 -07:00
dnode_sync.c Report dnodes with faulty bonuslen 2022-02-16 17:58:55 -08:00
dnode.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
dsl_bookmark.c Fix -Wattribute-warning in dsl layer 2022-07-27 13:38:56 -07:00
dsl_crypt.c Move dmu_buf_rele() after dsl_dataset_sync_done() 2023-03-01 09:36:19 -08:00
dsl_dataset.c Revert zfeature_active() to static 2023-03-01 09:36:19 -08:00
dsl_deadlist.c Fix panic in dsl_process_sub_livelist for EINTR 2022-11-01 12:34:08 -07:00
dsl_deleg.c Reduce loaded range tree memory usage 2019-10-09 10:36:03 -07:00
dsl_destroy.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
dsl_dir.c Avoid null pointer dereference in dsl_fs_ss_limit_check() 2022-12-01 12:39:43 -08:00
dsl_pool.c Move dmu_buf_rele() after dsl_dataset_sync_done() 2023-03-01 09:36:19 -08:00
dsl_prop.c dsl_prop_known_index(): check for invalid prop 2022-11-08 10:16:21 -08:00
dsl_scan.c Partially revert eee9362a7 2023-03-01 09:36:19 -08:00
dsl_synctask.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
dsl_userhold.c Replace sprintf()->snprintf() and strcpy()->strlcpy() 2020-06-07 11:42:12 -07:00
edonr_zfs.c Add include files for prototypes 2020-06-18 12:21:25 -07:00
fm.c fm_fmri_hc_create() must call va_end() before returning 2022-12-01 12:39:42 -08:00
gzip.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
hkdf.c
lz4.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
lzjb.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
Makefile.in Distributed Spare (dRAID) Feature 2020-11-13 13:51:51 -08:00
metaslab.c Stop ganging due to past vdev write errors 2022-11-01 12:36:25 -07:00
mmp.c Optimize small random numbers generation 2021-09-14 12:10:17 -07:00
multilist.c Optimize small random numbers generation 2021-09-14 12:10:17 -07:00
objlist.c Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
pathname.c Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
range_tree.c Several sorted scrub optimizations 2022-07-26 10:10:37 -07:00
refcount.c Export minimal zfs_refcount interfaces 2022-04-06 10:29:00 -07:00
rrwlock.c Rename refcount.h to zfs_refcount.h 2020-07-29 16:35:33 -07:00
sa.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
sha256.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
skein_zfs.c Add include files for prototypes 2020-06-18 12:21:25 -07:00
spa_boot.c Add include files for prototypes 2020-06-18 12:21:25 -07:00
spa_checkpoint.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
spa_config.c Cleaning up uio headers 2021-02-20 20:16:50 -08:00
spa_errlog.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
spa_history.c Annotated dprintf as printf-like 2021-06-24 13:12:36 -07:00
spa_log_spacemap.c Address warnings about possible division by zero from clangsa 2022-12-01 12:39:43 -08:00
spa_misc.c Remove refcount from spa_config_*() 2022-07-26 10:10:37 -07:00
spa_stats.c Remove pool io kstats 2021-06-10 10:50:16 -07:00
spa.c Fix NULL pointer dereference in spa_open_common() 2022-12-01 12:39:42 -08:00
space_map.c Optimize small random numbers generation 2021-09-14 12:10:17 -07:00
space_reftree.c Reduce loaded range tree memory usage 2019-10-09 10:36:03 -07:00
THIRDPARTYLICENSE.cityhash OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
THIRDPARTYLICENSE.cityhash.descrip OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
txg.c Optimize txg_kick() process (#12274) 2022-09-21 16:12:14 -07:00
uberblock.c MMP interval and fail_intervals in uberblock 2019-03-21 12:47:57 -07:00
unique.c Reduce loaded range tree memory usage 2019-10-09 10:36:03 -07:00
vdev_cache.c Replace ASSERTV macro with compiler annotation 2019-12-05 12:37:00 -08:00
vdev_draid_rand.c Distributed Spare (dRAID) Feature 2020-11-13 13:51:51 -08:00
vdev_draid.c Improve too large physical ashift handling 2022-09-21 13:15:15 -07:00
vdev_indirect_births.c Fixes: #8934 Large kmem_alloc 2019-07-10 15:54:49 -07:00
vdev_indirect_mapping.c Replace ASSERTV macro with compiler annotation 2019-12-05 12:37:00 -08:00
vdev_indirect.c module/zfs: vdev_indirect: vdev_indirect_repair: remove unused variable 2022-05-02 15:42:58 -07:00
vdev_initialize.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
vdev_label.c Use fallthrough macro 2021-11-02 09:50:30 -07:00
vdev_mirror.c Improve too large physical ashift handling 2022-09-21 13:15:15 -07:00
vdev_missing.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
vdev_queue.c Avoid vq_lock drop in vdev_queue_aggregate() 2021-09-14 14:31:22 -07:00
vdev_raidz_math_aarch64_neon_common.h FreeBSD: fix the build with Clang 11 2020-08-17 15:40:17 -07:00
vdev_raidz_math_aarch64_neon.c Linux 5.0 compat: SIMD compatibility 2019-07-12 09:31:20 -07:00
vdev_raidz_math_aarch64_neonx2.c vdev_raidz_math_aarch64_neonx2.c: suppress diagnostic only for GCC 2022-12-09 12:07:38 -08:00
vdev_raidz_math_avx2.c FreeBSD: fix the build with Clang 11 2020-08-17 15:40:17 -07:00
vdev_raidz_math_avx512bw.c Refactor ccompile.h to not include system headers 2020-07-25 20:09:50 -07:00
vdev_raidz_math_avx512f.c FreeBSD: fix the build with Clang 11 2020-08-17 15:40:17 -07:00
vdev_raidz_math_impl.h Distributed Spare (dRAID) Feature 2020-11-13 13:51:51 -08:00
vdev_raidz_math_powerpc_altivec_common.h Linux ppc64le ieee128 compat: Do not redefine __asm on external headers 2023-01-19 12:50:42 -08:00
vdev_raidz_math_powerpc_altivec.c Prefix zfs internal endian checks with _ZFS 2020-07-28 13:02:49 -07:00
vdev_raidz_math_scalar.c Use fallthrough macro 2021-11-02 09:50:30 -07:00
vdev_raidz_math_sse2.c FreeBSD: fix the build with Clang 11 2020-08-17 15:40:17 -07:00
vdev_raidz_math_ssse3.c Refactor ccompile.h to not include system headers 2020-07-25 20:09:50 -07:00
vdev_raidz_math.c Initialize parity blocks before RAID-Z reconstruction benchmarking 2021-09-14 14:32:16 -07:00
vdev_raidz.c Improve too large physical ashift handling 2022-09-21 13:15:15 -07:00
vdev_rebuild.c Fix sequential resilver drive failure race condition 2022-10-21 14:05:06 -07:00
vdev_removal.c module: zfs: vdev_removal: remove unused num_indirect 2022-12-01 12:39:44 -08:00
vdev_root.c Distributed Spare (dRAID) Feature 2020-11-13 13:51:51 -08:00
vdev_trim.c Propagate extent_bytes change to autotrim thread 2022-11-01 12:48:23 -07:00
vdev.c zed: unclean disk attachment faults the vdev 2023-01-05 11:09:36 -08:00
zap_leaf.c Optimize microzaps 2023-03-02 14:37:07 -08:00
zap_micro.c Optimize microzaps 2023-03-02 14:37:07 -08:00
zap.c Remove unneeded "extern inline" function declarations 2022-02-16 17:58:56 -08:00
zcp_get.c Add include files for prototypes 2020-06-18 12:21:25 -07:00
zcp_global.c
zcp_iter.c Fix typos in module/zfs/ 2019-09-02 17:56:41 -07:00
zcp_set.c Support setting user properties in a channel program 2020-02-14 13:41:42 -08:00
zcp_synctask.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
zcp.c Fix too few arguments to formatting function 2022-12-01 12:39:43 -08:00
zfeature.c Throw const on some strings 2020-10-02 17:44:10 -07:00
zfs_byteswap.c Mark functions as static 2020-06-18 12:20:38 -07:00
zfs_fm.c Remove an unused variable 2022-12-01 12:39:43 -08:00
zfs_fuid.c Fix regression in POSIX mode behavior 2021-03-19 22:50:46 -07:00
zfs_ioctl.c Cleanup: Make memory barrier definitions consistent across kernels 2022-12-01 12:39:40 -08:00
zfs_log.c Add Module Parameter Regarding Log Size Limit 2022-09-21 16:12:14 -07:00
zfs_onexit.c file reference counts can get corrupted 2021-09-14 12:37:38 -07:00
zfs_quota.c File incorrectly zeroed when receiving incremental stream that toggles -L 2020-06-09 10:41:01 -07:00
zfs_ratelimit.c
zfs_replay.c Use fallthrough macro 2021-11-02 09:50:30 -07:00
zfs_rlock.c Add a "try" operation for range locks 2020-07-06 11:53:31 -07:00
zfs_sa.c Extending FreeBSD UIO Struct 2021-01-20 21:27:30 -08:00
zfs_vnops.c Revert behavior of 59eab109 on not-Linux 2022-08-02 10:05:14 -07:00
zil.c zil: Relax assertion in zil_parse 2022-11-01 12:49:14 -07:00
zio_checksum.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
zio_compress.c module: zfs: fix unused, remove argsused 2022-02-16 17:58:56 -08:00
zio_inject.c Optimize small random numbers generation 2021-09-14 12:10:17 -07:00
zio.c Revert "ztest fails assertion in zio_write_gang_member_ready()" 2023-01-24 15:35:24 -08:00
zle.c Add include files for prototypes 2020-06-18 12:21:25 -07:00
zrlock.c Remove dead code 2020-06-18 12:21:18 -07:00
zthr.c Avoid memory allocations in the ARC eviction thread 2022-02-03 15:30:52 -08:00
zvol.c Add Module Parameter Regarding Log Size Limit 2022-09-21 16:12:14 -07:00