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Rob N
b5e6091885
spa_thread() and the "System Duty Cycle" scheduling class are from Illumos and have not yet been adapted to Linux or FreeBSD. HAVE_SPA_THREAD has long been explicitly undefined and used to mark spa_thread(), but there's some related taskq code that can never be invoked without it, which makes some already-tricky code harder to read. HAVE_SYSDC is introduced in this commit to mark the SDC parts. SDC requires spa_thread(), but the inverse is not true, so they are separate. I don't want to make the call to just remove it because I still harbour hopes that OpenZFS could become a first-class citizen on Illumos someday. But hopefully this will at least make the reason it exists a bit clearer for people without long memories and/or an interest in history. For those that are interested in the history, the original FreeBSD port of ZFS (before ZFS-on-Linux was adopted there) did have a spa_thread(), but not SDC. The last version of that before it was removed can be read here: https://github.com/freebsd/freebsd-src/blob/22df1ffd812f0395cdb7c0b1edae1f67b991562a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Meanwhile, more information on the SDC scheduling class is here: https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/disp/sysdc.c Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #15406
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 12.2-RELEASE.