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Matthew Macy
e111c80247
The arc_adapt() function tunes LRU/MLU balance according to 4 types of cache hits (which is passed as state agrument): ghost LRU, LRU, MRU, ghost MRU. If this function is called with wrong cache hit (state), adaptation will be sub-optimal and performance will suffer. Some time ago upstream received this commit: 6950 ARC should cache compressed data) in arc_read() do next sequence (access to ghost buffer) Before this commit, hit to any ghost list was passed arc_adapt() before call to arc_access() which revive element in cache and change state from ghost to real hit. After this commit, the order of calls was reverted and arc_adapt() is now called only with «real» hits even if hit was in one of two ghost lists, which renders ghost lists useless and breaks the ARC algorithm. FreeBSD fixed this problem locally in Change D19094 / Commit r348772. This change is an adaptation of the above commit to the current arc code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matt Macy <mmacy@FreeBSD.org> Closes #10548 Closes #10618
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 Linux distribution can be found at the ZoL Site.
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 12-STABLE and 13-CURRENT.