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mirror_zfs/module/zfs
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Matthew Ahrens d9eea113f8 It is not necessary to zero struct dbuf_hold_impl_data 
Under a workload which makes heavy use of `dbuf_hold()`, I noticed that a
considerable amount of time was spent in `dbuf_hold_impl()`, due to its call to
`kmem_zalloc(sizeof (struct dbuf_hold_impl_data) * DBUF_HOLD_IMPL_MAX_DEPTH)`,
which is around 2KiB.  This structure is used as a stack, to limit the size of
the C stack as dbuf_hold() calls itself recursively.  We make a recursive call
to hold the parent's dbuf when the requested dbuf is not found.  The vast
majority of the time, the parent or grandparent indirect dbuf is cached, so the
number of recursive calls is very low.  However, we initialize this entire
array for every call to dbuf_hold().

To improve performance, this commit changes `dbuf_hold()` to use `kmem_alloc()`
instead of `kmem_zalloc()`.  __dbuf_hold_impl_init is changed to initialize all
members of the struct before they are used.  I observed ~5% performance
improvement on a workload which creates many files.

Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4974
2016-08-16 15:27:17 -07:00
..
arc.c arc_meta_limit should be updated when arc_max is changed. 2016-08-02 13:43:36 -07:00
blkptr.c
bplist.c
bpobj.c
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 It is not necessary to zero struct dbuf_hold_impl_data 2016-08-16 15:27:17 -07:00
ddt_zap.c
ddt.c
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 OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dmu_traverse.c Add tunable to ignore hole_birth 2016-08-15 09:52:56 -07:00
dmu_tx.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
dmu_zfetch.c Illumos 6281 - prefetching should apply to 1MB reads 2016-01-12 13:51:27 -08:00
dmu.c Implement large_dnode pool feature 2016-06-24 13:13:21 -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
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
lz4.c
lzjb.c
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
refcount.c
rrwlock.c
sa.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
sha256.c
spa_boot.c
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
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
spa.c OpenZFS 5997 - FRU field not set during pool creation and never updated 2016-08-12 13:06:48 -07:00
space_map.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
space_reftree.c
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
unique.c
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
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 RAIDZ parity kstat rework 2016-07-19 16:43:07 -07:00
vdev_raidz.c Build user-space with different gcc optimization levels 2016-08-09 14:40:35 -07:00
vdev_root.c
vdev.c Fix incorrect pool state after import 2016-08-12 13:46:51 -07:00
zap_leaf.c
zap_micro.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
zap.c Implement large_dnode pool feature 2016-06-24 13:13:21 -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
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
zio_compress.c
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
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
zvol.c Linux 4.8 compat: Fix removal of bio->bi_rw member 2016-08-11 11:19:34 -07:00