ed87d456e4
Neither FreeBSD nor Linux currently implement kmem_cache_set_move(), which means dnode_move() is never called. In such situation use of dnode handles with respective locking to access dnode from dbuf is a waste of time for no benefit. This patch implements optional simplified code for such platforms, saving at least 3 dnode lock/dereference/unlock per dbuf life cycle. Originally I hoped to drop the handles completely to save memory, but they are still used in dnodes allocation code, so left for now. Before this change in CPU profiles of some workloads I saw 4-20% of CPU time spent in zrl_add_impl()/zrl_remove(), which are gone now. Reviewed-by: Rob Wing <rob.wing@klarasystems.com Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #16374 |
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README.md
OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.4-RELEASE.