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George Melikov 1149ba6478 OpenZFS 7606 - dmu_objset_find_dp() takes a long time while importing pool 
When importing a pool with a large number of filesystems within the same
parent filesystem, we see that dmu_objset_find_dp() takes a long time.
It is called from 3 places: spa_check_logs(), spa_ld_claim_log_blocks(),
and spa_load_verify().

There are several ways to improve performance here:

    1. We don't really need to do spa_check_logs() or
       spa_ld_claim_log_blocks() if the pool was closed cleanly.

    2. spa_load_verify() uses dmu_objset_find_dp() to check that no
       datasets have too long of names.

    3. dmu_objset_find_dp() is slow because it's doing
       zap_value_search() (which is O(N sibling datasets)) to determine
       the name of each dsl_dir when it's opened. In this case we
       actually know the name when we are opening it, so we can provide
       it and avoid the lookup.

This change implements fix #3 from the above list; i.e. make
dmu_objset_find_dp() provide the name of the dataset so that we don't
have to search for it.

Authored by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Steve Gonczi <steve.gonczi@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Prashanth Sreenivasa <prashksp@gmail.com>
Reviewed-by: David Quigley <david.quigley@intel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: George Melikov <mail@gmelikov.ru>

OpenZFS-issue: https://www.illumos.org/issues/7606
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/cac6bab
Closes #5662
2017-01-26 12:46:02 -08:00
.github Further work on Github usability (issue templates) 2017-01-03 15:01:48 -06:00
cmd OpenZFS 7163 - ztest failures due to excess error injection 2017-01-26 12:34:29 -08:00
config Fix spelling 2017-01-03 11:31:18 -06:00
contrib Fix spelling 2017-01-03 11:31:18 -06:00
etc Fix zfs-share systemd unit file 2017-01-13 13:24:17 -08:00
include OpenZFS 7336 - vfork and O_CLOEXEC causes zfs_mount EBUSY 2017-01-26 12:28:29 -08:00
lib OpenZFS 6412 - zfs receive: -u can be ignored sometimes 2017-01-26 12:42:48 -08:00
man Minor man-page formatting fixes 2017-01-24 09:09:02 -08:00
module OpenZFS 7606 - dmu_objset_find_dp() takes a long time while importing pool 2017-01-26 12:46:02 -08:00
rpm Add -c to zpool iostat & status to run command 2016-11-29 14:45:38 -07:00
scripts OpenZFS 7348 - cstyle can't handle ellipsis on continuation line 2017-01-26 12:40:22 -08:00
tests OpenZFS 7336 - vfork and O_CLOEXEC causes zfs_mount EBUSY 2017-01-26 12:28:29 -08:00
udev Fix spelling 2017-01-03 11:31:18 -06:00
.gitignore Update .gitignore 2016-10-19 14:29:33 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
AUTHORS Add a missing > to AUTHORS 2014-09-02 14:18:53 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac Add test for chattr 2016-12-16 16:07:41 -08:00
copy-builtin Illumos Crypto Port module added to enable native encryption in zfs 2016-07-20 10:43:30 -07:00
COPYRIGHT Update ZED copyright boilerplate 2015-05-11 15:07:00 -07:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Use cstyle -cpP in make cstyle check 2016-12-12 10:46:26 -08:00
META Tag 0.7.0-rc3 2017-01-20 10:18:28 -08:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Add CONTRIBUTING information and templates 2016-12-09 12:48:12 -07:00
TEST Skip xfstests on Ubuntu 16.04 and CentOS 7 2016-12-14 09:36:14 -08:00
zfs-script-config.sh.in Introduce tests for python scripts 2016-10-06 13:11:57 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

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

ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers. And it's native!

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.