zfs/module
Matthew Ahrens 1fac63e56f OpenZFS 9577 - remove zfs_dbuf_evict_key tsd
The zfs_dbuf_evict_key TSD (thread-specific data) is not necessary -
we can instead pass a flag down in a few places to prevent recursive
dbuf eviction. Making this change has 3 benefits:

1. The code semantics are easier to understand.
2. On Linux, performance is improved, because creating/removing
   TSD values (by setting to NULL vs non-NULL) is expensive, and
   we do it very often.
3. According to Nexenta, the current semantics can cause a
   deadlock when concurrently calling dmu_objset_evict_dbufs()
   (which is rare today, but they are working on a "parallel
   unmount" change that triggers this more easily):

Porting Notes:
* Minor conflict with OpenZFS 9337 which has not yet been ported.

Authored by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://illumos.org/issues/9577
OpenZFS-commit: https://github.com/openzfs/openzfs/pull/645
External-issue: DLPX-58547
Closes #7602
2018-06-13 11:05:06 -07:00
..
avl Update build system and packaging 2018-05-29 16:00:33 -07:00
icp Update build system and packaging 2018-05-29 16:00:33 -07:00
lua Update build system and packaging 2018-05-29 16:00:33 -07:00
nvpair Update build system and packaging 2018-05-29 16:00:33 -07:00
spl Add pool state /proc entry, "SUSPENDED" pools 2018-06-06 09:33:54 -07:00
unicode Update build system and packaging 2018-05-29 16:00:33 -07:00
zcommon OpenZFS 9235 - rename zpool_rewind_policy_t to zpool_load_policy_t 2018-06-04 14:54:20 -07:00
zfs OpenZFS 9577 - remove zfs_dbuf_evict_key tsd 2018-06-13 11:05:06 -07:00
.gitignore Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00
Makefile.in Update build system and packaging 2018-05-29 16:00:33 -07:00