01937958ce
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 |
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README.markdown
ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.
Official Resources
Installation
Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.
Contribute & Develop
We have a separate document with contribution guidelines.