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- When receiving memory pressure signal from OS be more strict trying to free some memory. Otherwise kernel may come again and request much more. Return as result how much arc_c was actually reduced due to this request, that may be less than requested. - On Linux when receiving direct reclaim from some file system (that may be ZFS) instead of ignoring request completely, just shrink the ARC, but do not wait for eviction. Waiting there may cause deadlock. Ignoring it as before may put extra pressure on other caches and/or swap, and cause OOM if nothing help. While not waiting may result in more ARC evicted later, and may be too late if OOM killer activate right now, but I hope it to be better than doing nothing at all. - On Linux set arc_no_grow before waiting for reclaim, not after, or it may grow back while we are waiting. - On Linux add new parameter zfs_arc_shrinker_seeks to balance ARC eviction cost, relative to page cache and other subsystems. - Slightly update Linux arc_set_sys_free() math for new kernels. Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Reviewed-by: Rob Norris <rob.norris@klarasystems.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> |
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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.