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LOLi fd01167ffd Fix hung z_zvol tasks during 'zfs receive' 
During a receive operation zvol_create_minors_impl() can wait
needlessly for the prefetch thread because both share the same tasks
queue.  This results in hung tasks:

<3>INFO: task z_zvol:5541 blocked for more than 120 seconds.
<3>      Tainted: P           O  3.16.0-4-amd64
<3>"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

The first z_zvol:5541 (zvol_task_cb) is waiting for the long running
traverse_prefetch_thread:260

root@linux:~# cat /proc/spl/taskq
taskq                       act  nthr  spwn  maxt   pri  mina
spl_system_taskq/0            1     2     0    64   100     1
	active: [260]traverse_prefetch_thread [zfs](0xffff88003347ae40)
	wait: 5541
spl_delay_taskq/0             0     1     0     4   100     1
	delay: spa_deadman [zfs](0xffff880039924000)
z_zvol/1                      1     1     0     1   120     1
	active: [5541]zvol_task_cb [zfs](0xffff88001fde6400)
	pend: zvol_task_cb [zfs](0xffff88001fde6800)

This change adds a dedicated, per-pool, prefetch taskq to prevent the
traverse code from monopolizing the global (and limited) system_taskq by
inappropriately scheduling long running tasks on it.

Reviewed-by: Albert Lee <trisk@forkgnu.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #6330
Closes #6890
Closes #7343
2018-05-07 17:19:57 -07:00
.github Update codecov.yml 2018-03-14 16:10:36 -07:00
cmd Report pool suspended due to MMP 2018-05-07 17:19:56 -07:00
config Fix mmap / libaio deadlock 2018-05-07 17:19:57 -07:00
contrib modprobe zfs during dracut mount 2018-05-07 17:19:57 -07:00
etc chmod -x on etc/init.d/zfs-*.in automake files 2018-05-07 17:19:57 -07:00
include Fix hung z_zvol tasks during 'zfs receive' 2018-05-07 17:19:57 -07:00
lib Add support for nvme based devids 2018-05-07 17:19:57 -07:00
man Add zfs_scan_ignore_errors tunable 2018-05-07 17:19:56 -07:00
module Fix hung z_zvol tasks during 'zfs receive' 2018-05-07 17:19:57 -07:00
rpm Fix mmap / libaio deadlock 2018-05-07 17:19:57 -07:00
scripts Fix free memory calculation on v3.14+ 2018-03-14 16:10:37 -07:00
tests Fix mmap / libaio deadlock 2018-05-07 17:19:57 -07:00
udev Fix spelling 2017-01-03 11:31:18 -06:00
.gitignore Add configure option to enable gcov analysis 2018-03-14 16:10:36 -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 Fix mmap / libaio deadlock 2018-05-07 17:19:57 -07:00
copy-builtin Allow c99 when building ZFS in the kernel tree 2017-03-27 12:31:15 -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 Add support for "--enable-code-coverage" option 2018-03-14 16:10:36 -07:00
META Tag zfs-0.7.8 2018-04-09 14:31:57 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Update codecov.yml 2018-03-14 16:10:36 -07:00
TEST Retire filebench testing 2017-06-01 06:24:28 -07:00
zfs-script-config.sh.in zpool iostat/status -c improvements 2017-06-05 10:52:15 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

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.