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Brian Behlendorf f14b6f2302 Linux: Set spl_kmem_cache_slab_limit when page size !4K 
For small objects the kernel's slab implementation is very fast and
space efficient. However, as the allocation size increases to
require multiple pages performance suffers. The SPL kmem cache
allocator was designed to better handle these large allocation
sizes. Therefore, on Linux the kmem_cache_* compatibility wrappers
prefer to use the kernel's slab allocator for small objects and
the custom SPL kmem cache allocator for larger objects.

This logic was effectively disabled for all architectures using
a non-4K page size which caused all kmem caches to only use the
SPL implementation. Functionally this is fine, but the SPL code
which calculates the target number of objects per-slab does not
take in to account that __vmalloc() always returns page-aligned
memory. This can result in a massive amount of wasted space when
allocating tiny objects on a platform using large pages (64k).

To resolve this issue we set the spl_kmem_cache_slab_limit cutoff
to 16K for all architectures. 

This particular change does not attempt to update the logic used
to calculate the optimal number of pages per slab. This remains
an issue which should be addressed in a future change.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #12152
Closes #11429
Closes #11574
Closes #12150
2021-06-23 13:22:15 -07:00
.github CI: Increase free space in workflow 2021-06-23 13:22:14 -07:00
cmd Fix zfs_get_data access to files with wrong generation 2021-06-23 13:22:15 -07:00
config linux 5.13 compat: bdevops->revalidate_disk() removed (#12122) 2021-06-23 13:22:15 -07:00
contrib dracut: Fix race condition between load-key and import 2021-02-05 11:40:33 -08:00
etc zfs-import-{cache,scan}: change condition to FileNotEmpty 2021-02-05 11:42:40 -08:00
include Fix zfs_get_data access to files with wrong generation 2021-06-23 13:22:15 -07:00
lib receive: don't fail inheriting (-x) properties on wrong dataset type 2021-06-23 13:22:14 -07:00
man Fixed incorrect man page reference in zfsprops(8) 2021-06-23 13:22:14 -07:00
module Linux: Set spl_kmem_cache_slab_limit when page size !4K 2021-06-23 13:22:15 -07:00
rpm RPM: Explicitly set the required min/max kernel version for the DKMS package 2021-06-23 13:22:15 -07:00
scripts DKMS: Disable weak modules 2020-12-23 14:34:59 -08:00
tests ZTS: Fix xattr_002_neg passing too soon 2021-06-23 13:22:15 -07:00
udev Centralize variable substitution 2020-07-14 17:33:44 -07:00
.editorconfig Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
.gitignore Add FreeBSD support to OpenZFS 2020-04-14 11:36:28 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
AUTHORS Add zstd support to zfs 2020-08-20 10:30:06 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
CODE_OF_CONDUCT.md Replace ZFS on Linux references with OpenZFS 2020-10-16 13:01:24 -07:00
configure.ac ZTS: Add tests for DOS mode attributes 2021-06-23 13:22:14 -07:00
copy-builtin Replace ZFS on Linux references with OpenZFS 2020-10-16 13:01:24 -07:00
COPYRIGHT Fix typos 2020-06-09 21:24:09 -07:00
cppcheck-suppressions.txt Import ZStandard v1.4.5 2020-08-20 10:30:06 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Fix 'make checkbashisms` warnings 2021-06-23 13:22:14 -07:00
META Tag zfs-2.0.4 2021-03-08 13:04:37 -08:00
NEWS Fix NEWS file 2020-08-27 16:07:01 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md docs: update README's installation link 2020-10-16 13:00:13 -07:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

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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.

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Official Resources

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 META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are 12-STABLE and 13-CURRENT.