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Tom Caputi c317c8c811 Allow empty ds_props_obj to be destroyed 
Currently, 'zfs list' and 'zfs get' commands can be slow when
working with snapshots that have a ds_props_obj. This is
because the code that discovers all of the properties for these
snapshots needs to read this object for each snapshot, which
almost always ends up causing an extra random synchronous read
for each snapshot. This performance penalty exists even if the
properties on that snapshot have been unset because the object
is normally only freed when the snapshot is freed, even though
it is only created when it is needed.

This patch allows the user to regain 'zfs list' performance on
these snapshots by destroying the ds_props_obj when it no longer
has any entries left. In practice on a production machine, this
optimization seems to make 'zfs list' about 55% faster.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Paul Zuchowski <pzuchowski@datto.com>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #9704
2019-12-13 11:51:39 -08:00
.github Fixes typo from #9681 2019-12-09 10:10:55 -08:00
cmd Add FreeBSD jail support hooks 2019-12-11 11:58:37 -08:00
config Remove zfs_vdev_elevator module option 2019-11-27 10:35:49 -08:00
contrib Skip loading already loaded key 2019-11-08 14:34:07 -08:00
etc Fix encryption logic in systemd mount generator 2019-11-27 10:54:49 -08:00
include Make zfs_replay.c work on FreeBSD 2019-12-13 07:54:10 -08:00
lib Add FreeBSD jail support hooks 2019-12-11 11:58:37 -08:00
man Add FreeBSD jail support hooks 2019-12-11 11:58:37 -08:00
module Allow empty ds_props_obj to be destroyed 2019-12-13 11:51:39 -08:00
rpm Canonicalize Python shebangs 2019-09-12 13:32:32 -07:00
scripts Move platform independent tests to a shared runfile 2019-10-09 10:39:26 -07:00
tests zio_decompress_data always ASSERTs successful decompression 2019-12-10 15:51:58 -08:00
udev Restore :: in Makefile.am 2019-08-26 11:48:31 -07:00
.gitignore Adapt gitignore for modules 2019-12-02 13:23:47 -08:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
.travis.yml Add .travis.yml 2017-11-13 09:18:18 -08:00
AUTHORS Update build system and packaging 2018-05-29 16:00:33 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
CODE_OF_CONDUCT.md Add CODE_OF_CONDUCT.md 2019-04-30 10:58:45 -07:00
configure.ac Prevent unnecessary resilver restarts 2019-11-27 10:15:01 -08:00
copy-builtin copy-builtin: SPL must be in Kbuild first (again) 2019-09-11 11:09:50 -07:00
COPYRIGHT OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
META Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
NEWS Add NEWS file 2018-09-18 12:03:47 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md Explicitly state supported Linux versions 2018-05-30 20:11:19 -07:00
TEST Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

img

ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.

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Official Resources

Installation

Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.

Contribute & Develop

We have a separate document with contribution guidelines.

Release

ZFS on Linux 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 kernel versions.