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`arc_free_memory()` returns the amount of memory that the ARC considers to be free. This includes pages that are not actually free, but can be evicted with essentially zero cost (without doing any i/o), for example the page cache. The ARC can "squeeze out" any pages included in this calculation, leaving only `arc_sys_free` (1/64th of RAM) for these free/evictable pages. Included in the count of free/evictable pages is `nr_inactive_anon_pages()`, which is described as "Anonymous memory that has not been used recently and can be swapped out". These pages would have to be written out to disk (swap) in order to evict them, and they are not included in `/proc/meminfo`'s `MemAvailable`. Therefore it is not appropriate for `nr_inactive_anon_pages()` to be included in the free/evictable memory returned by `arc_free_memory()`, because the ARC shouldn't (intentionally) make the system swap. This commit removes `nr_inactive_anon_pages()` from the memory returned by `arc_free_memory()`. This is a step towards enabling the ARC to manage free memory by monitoring it and reducing the ARC size as we notice that there is insufficient free memory (in the `arc_reap_zthr`), rather than the current method of relying on the `arc_shrinker` callback. Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #10575 |
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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 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.