mirror_zfs/module
Matthew Ahrens 64fc776208 OpenZFS 7968 - multi-threaded spa_sync()
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: Saso Kiselkov <saso.kiselkov@nexenta.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: Matthew Ahrens <mahrens@delphix.com>

spa_sync() iterates over all the dirty dnodes and processes each of them
by calling dnode_sync(). If there are many dirty dnodes (e.g. because we
created or removed a lot of files), the single thread of spa_sync()
calling dnode_sync() can become a bottleneck. Additionally, if many
dnodes are dirtied concurrently in open context (e.g. due to concurrent
file creation), the os_lock will experience lock contention via
dnode_setdirty().

The solution is to track dirty dnodes on a multilist_t, and for
spa_sync() to use separate threads to process each of the sublists in
the multilist.

OpenZFS-issue: https://www.illumos.org/issues/7968
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/4a2a54c
Closes #5752
2017-03-20 18:36:00 -07:00
..
avl Fix uninitialized variable in avl_add() 2016-07-25 14:21:34 -07:00
icp [icp] fpu and asm cleanup for linux 2017-03-07 12:59:31 -08:00
nvpair OpenZFS 7812 - Remove gender specific language 2017-02-24 11:07:04 -08:00
unicode codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
zcommon OpenZFS 6931 - lib/libzfs: cleanup gcc warnings 2017-02-07 14:02:27 -08:00
zfs OpenZFS 7968 - multi-threaded spa_sync() 2017-03-20 18:36:00 -07:00
zpios codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
.gitignore module/.gitignore: Add *.dwo (#4580) 2016-05-02 09:07:04 -07:00
Makefile.in module/Makefile.in: use relative cp 2017-01-13 15:18:34 -08:00